MAX17015AETP+ ,1.2MHz Low-Cost, High-Performance ChargersApplications Ordering InformationNotebook ComputersPART TEMP RANGE PIN-PACKAGETablet PCs MAX17005AE ..
MAX17015EVKIT+ ,Evaluation Kit for the MAX17015Bfeatures S Up to 1.2MHz Switching Frequencythe MAX17015B highly integrated, multichemistry bat-S Pr ..
MAX17016ETL+ ,Single Quick-PWM Step-Down Controller with Internal 26V MOSFETsElectrical Characteristics(Circuit of Figure 1, V = 12V, V = V = V = 5V, REFIN = ILIM = REF, SKIP = ..
MAX17016ETL+T ,Single Quick-PWM Step-Down Controller with Internal 26V MOSFETsapplications that need lower current-limit • Thermal Compensation with NTCsettings to avoid overdes ..
MAX17017GTM+ ,Quad-Output Controller for Low-Power ArchitectureApplicationsONA 39 22 AGND1-to-4 Li+ Cell Battery-Powered Devices INBC 40 21 REFINBC 41 20 FREQLow- ..
MAX17017GTM+T ,Quad-Output Controller for Low-Power ArchitectureELECTRICAL CHARACTERISTICS(Circuit of Figure 1 (step-down), V = 12V, V = V = V = V = V = V = V = 5V ..
MAX4517CPA ,Dual-Supply / Low-On-Resistance / SPST / CMOS Analog SwitchesApplications ' Fast Switching Speed: t = 100ns, t = 75nsON OFFBattery-Operated Equipment ' t > t a ..
MAX4517CSA ,Dual-Supply / Low-On-Resistance / SPST / CMOS Analog SwitchesFeaturesThe MAX4516/MAX4517 are single-pole/single-throw' Available in SOT23-5 Package(SPST), CMOS, ..
MAX4517EUK ,Dual-Supply / Low-On-Resistance / SPST / CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—±5V Supply(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, V = 3.5V, V = 1.5V, ..
MAX4517EUK+T ,Dual-Supply, Low On-Resistance, SPST, CMOS Analog SwitchesApplications ♦ Fast Switching Speed: t = 100ns, t = 75nsON OFFBattery-Operated Equipment ♦ t > t a ..
MAX4518CEE ,Precision, 4-Channel/Dual 2-Channel, Low-Voltage, CMOS Analog MultiplexersELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, GND = 0V, V = V ..
MAX4518CEE ,Precision, 4-Channel/Dual 2-Channel, Low-Voltage, CMOS Analog MultiplexersMAX4518/MAX451919-1070; Rev. 1; 5/98Precision, 4-Channel/Dual 2-Channel,Low-Voltage, CMOS Analog Mu ..
MAX17005AETP+-MAX17015AETP+
1.2MHz Low-Cost, High-Performance Chargers
General DescriptionThe MAX17005A/MAX17006A/MAX17015A are high-fre-
quency multichemistry battery chargers. These circuits
feature a new high-frequency current-mode architecture
that significantly reduces component size and cost. The
charger uses a high-side MOSFET with n-channel syn-
chronous rectifier. Widely adjustable charge current,
charge voltage, and input current limit simplify the con-
struction of highly accurate and efficient chargers.
The charge voltage and charge current are set with
analog control inputs. The charge current setting can
also be adjusted with a PWM input. High-accuracy cur-
rent-sense amplifiers provide fast cycle-by-cycle cur-
rent-mode control to protect against short circuits to the
battery and respond quickly to system load transients.
In addition, the charger provides a high-accuracy ana-
log output that is proportional to the adapter current. In
the MAX17015A, this current monitor remains active
when the adapter is absent to monitor battery dis-
charge current.
The MAX17005A charges three or four Li+ series cells,
and the MAX17006A charges two or three Li+ series
cells. The MAX17015A adjusts the charge voltage set-
ting and the number of cells through a feedback resis-
tor-divider from the output. All variants of the charger
can provide at least 4A of charge current with a 10mΩ
sense resistor.
The charger utilizes a charge pump to control an n-channel
adapter selection switch. The charge pump remains
active even when the charger is off. When the adapter
is absent, a p-channel MOSFET selects the battery.
The MAX17005A/MAX17006A/MAX17015A are avail-
able in a small, 4mm x 4mm x 0.8mm 20-pin, lead-free
TQFN package. An evaluation kit is available to reduce
design time.
ApplicationsNotebook Computers
Tablet PCs
Portable Equipment with Rechargeable Batteries
FeaturesHigh Switching Frequency (1.2MHz)Controlled Inductor Current-Ripple Architecture
Reduced BOM Cost
Small Inductor and Output Capacitors±0.4% Accurate Charge Voltage±2.5% Accurate Input-Current Limiting±3% Accurate Charge CurrentSingle-Point CompensationMonitor Outputs for
±2.5% Accurate Input Current Limit
±2.5% Battery Discharge Current
(MAX17015A Only)
AC Adapter DetectionAnalog/PWM Adjustable Charge-Current SettingBattery Voltage Adjustable for 3 and 4 Cells
(MAX17005A) or 2 and 3 Cells (MAX17006A)Adjustable Battery Voltage (4.2V to 4.4V/Cell)Cycle-by-Cycle Current Limit
Battery Short-Circuit Protection
Fast Response for Pulse Charging
Fast System-Load-Transient ResponseProgrammable Charge Current < 5AAutomatic System Power Source Selection with
n-Channel MOSFETInternal Boost Diode+8V to +26V Input-Voltage Range
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
Ordering Information19-4355; Rev 0; 10/08
+Denotes a lead-free/RoHS compliant package.
*Future product—contact factory for availability.
**EP = Exposed pad.
PARTTEMP RANGEPIN-PACKAGE
MAX17005AETP+-40°C to +85°C20 TQFN-EP**
MAX17006AETP+*-40°C to +85°C20 TQFN-EP**
MAX17015AETP+-40°C to +85°C20 TQFN-EP**
Pin Configuration and Minimal Operating Circuit appear at
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VDCIN= VCSSP= VCSSN= 19V, VBATT= VCSIP= VCSIN= 16.8V, VVCTL= VAA, VISET= 1V, TA
= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DCIN, CSSP, CSSN, BATT, CSIN, CSIP, ACOK,
LX to AGND.......................................................-0.3V to +30V
BST to LDO.............................................................-0.3V to +30V
CSIP to CSIN, CSSP to CSSN..............................-0.3V to +0.3V
IINP, FB, ACIN to AGND.............................-0.3V to (VAA+ 0.3V)
VAA, LDO, ISET, VCTL, CC to AGND.......................-0.3V to +6V
DHI to LX....................................................-0.3V to (BST + 0.3V)
BST to LX..................................................................-0.3V to +6V
DLO to PGND............................................-0.3V to (LDO + 0.3V)
PGND to AGND....................................................-0.3V to +0.3V
Continuous Power Dissipation (TA= +70°C)
16-Pin TQFN (derate 16.9mW/°C above +70°C)....1349.1mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
CHARGE-VOLTAGE REGULATION2 cells, VVCTL = GND (MAX17006A) 8.3664 8.40 8.4336
3 cells, VVCTL = VAA (MAX17005A/MAX17006A) 12.549 12.60 12.651
4 cells, VVCTL = GND (MAX17005A) 16.733 16.80 16.867 Battery Regulation-Voltage Accuracy
FB accuracy using FB divider (MAX17015A)
(Note 1) 2.0916 2.1 2.1084
FB Input Bias Curent -1 +1 μA
2 cells (MAX17006A), 4 cells (MAX17005A) 0 VAA/2
-0.2
VCTL Range
3 cells (MAX17005A/MAX17006A) VAA/2
+0.2 VAA
VCTL Gain VCELL/VVCTL 5.85 6 6.15 V/V
VCTL Input Bias Current VVCTL = GND and VCTL = VAA-1 +1 μA
CHARGE-CURRENT REGULATION ISET Range 0 VAA/2 V
ISET = 1.4V 80 ISET Full-Scale Setting ISET = 99.9% duty cycle 60 mV
58.2 60 61.8 mV VISET = VAA/4 or ISET
= 99.9% duty cycle -3 +3 %
38.2 40 41.8 mV
Full-Charge Current Accuracy
(CSIP to CSIN) VISET = VAA/6 or ISET
= 66.7% duty cycle -4.5 +4.5 %
1.4 3 4.6 mV Trickle Charge-Current Accuracy
VBATT = 1V to 16.8V
VISET = VAA/80 or ISET
= 5% duty cycle -52 +52 %
Charge-Current Gain Error Based on VISET = VVAA/4 and VISET = VVAA/80 -2 +2 %
Charge-Current Offset Error Based on VISET = VVAA/4 and VISET = VVAA/80 -1.4 +1.4 mV
BATT/CSIP/CSIN Input-Voltage Range 0 24 V
ISET falling 21 26 31 ISET Power-Down Mode Threshold ISET rising 33 40 47 mV
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
PARAMETERCONDITIONSMINTYPMAXUNITSVISET = 3V -0.2 +0.2 ISET Input Bias Current CSSN = BATT, VISET= 5V -0.2 +0.2 μA
Rising 2.4 ISET PWM Threshold Falling 0.8 V
ISET Frequency 0.128 500 kHz
ISET Effective Resolution fPWM = 3.2MHz 8 Bits
INPUT-CURRENT REGULATION 58.5 60 61.5 mV Input Current-Limit Threshold VCSSP - VCSSN-2.5 +2.5 %
CSSN Input Bias Current Adapter present -0.1 +0.1 μA
CSSP/CSSN Input-Voltage Range 8.0 26.0 V
IINP Transconductance VCSSP - VCSSN = 60mV 2.66 2.8 2.94 μA/mV
VCSSP - VCSSN = 60mV, VIINP= 0 to 4.5V -2.5+2.5IINP Accuracy VCSSP - VCSSN = 35mV -2.5 +2.5 %
SUPPLY AND LINEAR REGULATORDCIN Input-Voltage Range 8 26 V
DCIN falling 7.9 8.1 DCIN Undervoltage-Lockout (UVLO) Trip-Point DCIN rising 8.7 8.9 V
Adapter present (Note 2) 3 6 mA DCIN + CSSP + CSSNQuiescent CurrentAdapter absent (Note 2) 30 50 μA
Adapter absent (Note 2) 10 20 VBATT = 16.8V Charger shutdown (Note 2) 10 20 BATT + CSIP + CSIN + LX Input Current
VBATT = 2V to 19V, adapter present (Note 2) 200 500
μA
LDO Output Voltage 8.0V < VDCIN < 26V, no load 5.15 5.35 5.55 V
LDO Load Regulation 0 < ILDO < 40mA 100 200 mV
LDO UVLO Threshold 3.2 4.1 5.0 V
REFERENCESVAA Output Voltage IVAA = 50μA 4.18 4.20 4.22 V
VAA UVLO Threshold VAA falling 3.1 3.9 V
ACINACIN Threshold 2.058 2.1 2.142 V
ACIN Threshold Hysteresis 10 20 30 mV
ACIN Input Bias Current -1 +1 μA
ACOK
ACOK Sink Current V ACOK = 0.4V, VACIN = 1.5V 6 mA
ACOK Leakage Current V ACOK = 5.5V, VACIN = 2.5V 1 μA
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VCSSP= VCSSN= 19V, VBATT= VCSIP= VCSIN= 16.8V, VVCTL= VAA, VISET= 1V, TA
= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
PARAMETERCONDITIONSMINTYPMAXUNITS
SWITCHING REGULATORDHI Off-Time K Factor VDCIN = 19V, VBATT = 10V 0.029 0.030 0.041 μs/V
Sense Voltage for Minimum Discontinuous
Mode Ripple Current VCSIP - VCSIN 10 mV
Zero-Crossing Comparator Threshold VCSIP - VCSIN 10 mV
Cycle-by-Cycle Current-Limit Sense VoltageVCSIP - VCSIN105 110 115 mV
DHI Resistance High IDLO = 10mA 1.5 3
DHI Resistance Low IDLO = -10mA 0.8 1.75
DLO Resistance High IDLO = 10mA 36
DLO Resistance Low IDLO = -10mA 37
ADAPTER DETECTION Adapter Absence-Detect Threshold VDCIN - VBATT, VDCIN falling +70 +120 +170 mV
Adapter Detect Threshold VDCIN - VBATT, VDCIN rising +360 +420 +580 mV
Adapter Switch Charge-Pump Frequency Charger Shutdown 180 200 220 Hz
DLO 0.04 0.1 0.20 Adapter Switch Charge-Pump Refresh Pulse DHI 0.070.15 0.30μs
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VCSSP= VCSSN= 19V, VBATT= VCSIP= VCSIN= 16.8V, VVCTL= VAA, VISET= 1V, TA
= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VDCIN= VCSSP= VCSSN= 19V, VBATT= VCSIP= VCSIN= 16.8V, VVCTL= VAA, VISET= 1V, TA
= -40°C to +85°C,unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
CHARGE-VOLTAGE REGULATION2 cells, VVCTL = GND (MAX17006A) 8.366 8.433
3 cells, VVCTL = VAA (MAX17005A/MAX17006A) 12.549 12.651
4 cells, VVCTL = GND (MAX17005A) 16.73 16.86 Battery Regulation-Voltage Accuracy
FB accuracy using FB divider (MAX17015A)
(Note 1) 2.091 2.108
2 cells (MAX17006A),
4 cells (MAX17005A) 0. VAA/2
- 0.2 VCTL Range
3 cells (MAX17005A/MAX17006A) VAA/2
+ 0.2 VAA
VCTL Gain VCELL/VVCTL 5.85 6.15 V/V
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VCSSP= VCSSN= 19V, VBATT= VCSIP= VCSIN= 16.8V, VVCTL= VAA, VISET= 1V, TA
= -40°C to +85°C,unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
CHARGE-CURRENT REGULATION ISET Range 0 VAA/2 V
57.5 62.5 mV VISET = VAA/4 or
ISET = 99.9% duty cycle -4.2 +4.2 %
38 42 mV
Full Charge-Current Accuracy
(CSIP to CSIN) VISET = VAA/6 or
ISET = 66.7% duty cycle -5 +5 %
1.4 4.6 mV Trickle Charge-Current Accuracy
VBATT = 1V to 16.8V
VISET = VAA/80 or
ISET = 5% duty cycle -52 +52 %
Charge-Current Gain Error Based on VISET = VVAA/4 and VISET = VVAA/80 -2 +2 %
Charge-Current Offset Error Based on VISET = VVAA/4 and VISET = VVAA/80 -1.4 +1.4 mV
BATT/CSIP/CSIN Input-Voltage Range 0 24 V
ISET falling 21 31 ISET Power-Down Mode Threshold
ISET rising 33 47
mV
Rising 2.4 ISET PWM Threshold Falling 0.8 V
ISET Frequency 0.128 500 kHz
INPUT-CURRENT REGULATION 58.2 61.8 mV Input Current-Limit Threshold VCSSP - VCSSN-3 +3 %
CSSN Input Bias Current Adapter present -2 +2 μA
CSSP/CSSN Input-Voltage Range 8.0 26.0 V
IINP Transconductance VCSSP - VCSSN = 60mV 2.66 2.94 μA/mV
VCSSP - VCSSN = 60mV, VIINP= 0 to 4.5V -2.5+2.5 IINP Accuracy
VCSSP - VCSSN = 35mV -2.5 +2.5
SUPPLY AND LINEAR REGULATORDCIN Input-Voltage Range 8 26 V
DCIN falling 7.9 DCIN UVLO Trip-Point DCIN rising 8.9 V
Adapter present (Note 2) 6 mA DCIN + CSSP + CSSNQuiescent CurrentAdapter absent (Note 2) 50 μA
Adapter absent (Note 2) 20 VBATT = 16.8V Charger shutdown (Note 2) 20 BATT + CSIP + CSIN + LX Input Current
VBATT = 2V to 19V, adapter present (Note 2) 500
μA
LDO Output Voltage 8.0V < VDCIN < 26V, no load 5.15 5.55 V
LDO Load Regulation 0 < ILDO < 40mA 200 mV
LDO UVLO Threshold 3.2 5.0 V
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VDCIN= VCSSP= VCSSN= 19V, VBATT= VCSIP= VCSIN= 16.8V, VVCTL= VAA, VISET= 1V, TA
= -40°C to +85°C,unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
REFERENCESVAA Output Voltage IVAA = 50μA 4.18 4.22 V
VAA UVLO Threshold VAA falling 3.9 V
ACINACIN Threshold 2.058 2.142 V
ACIN Threshold Hysteresis 10 30 mV
ACOK
ACOK Sink Current V ACOK = 0.4V, VACIN = 1.5V 6 mA
SWITCHING REGULATORDHI Off-Time K Factor VDCIN = 19V, VBATT = 10V 0.029 0.041 μs/V
Cycle-by-Cycle Current-Limit Sense VoltageVCSIP - VCSIN105 115 mV
DHI Resistance High IDLO = 10mA 3
DHI Resistance Low IDLO = -10mA 1.75
DLO Resistance High IDLO = 10mA 6
DLO Resistance Low IDLO = -10mA 7
ADAPTER DETECTION Adapter Absence-Detect Threshold VDCIN - VBATT, VDCIN falling +70 +170 mV
Adapter Detect Threshold VDCIN - VBATT, VDCIN rising +320 +620 mV
Adapter Switch Charge-Pump Frequency 180 220 Hz
DLO 0.04 0.2 Adapter Switch Charge-Pump Refresh Pulse DHI 0.07 0.3μs
Note 1:Accuracy does not include errors due to external resistance tolerances.
Note 2:Adapter present conditions are tested at VDCIN= 19V and VBATT= 16.8V. Adapter absent conditions are tested at
VDCIN= 16V, VBATT= 16.8V.
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
Typical Operating Characteristics(Circuit of Figure 1, adapter = 19V, battery = 10V, ISET = 1.05V, VCTL= GND, TA= +25°C, unless otherwise noted.)
IINP DC ERROR
vs. SYSTEM CURRENTMAX17005A toc01
SYSTEM CURRENT (A)
IINP ERROR (%)312
IINP ERROR
vs. SYSTEM CURRENT
MAX17005A toc02
SYSTEM CURRENT (A)
IINP ERROR (%)
VBATT = 16.8V
VBATT = 8.4VVBATT = 12.6V
ISET PWM DUTY-CYCLE CHANGEMAX17005A toc03
DUTY CYCLE
CHARGE-CURRENT ERROR (%)
ISET PWM DUTY-CYCLE CHANGE
MAX17005A toc04
DUTY CYCLE
CHARGE CURRENT (A)9010203040506070
ISET PWM FREQUENCY SWEEP
MAX17005A toc05
FREQUENCY (kHz)
CHARGE-CURRENT ERROR (%)
DUTY CYCLE = 75%
DUTY CYCLE = 25%
BATTERY VOLTAGE-SETTING ERRORMAX17005A toc06
VCTL (V)
BATTERY VOLTAGE ERROR (%)
SYSTEM LOAD TRANSIENT
MAX17005A toc07
200μs/div
SYSTEM
CURRENT
5A/div
CHARGING
CURRENT
5A/div
INDUCTOR
CURRENT
5A/div
EFFICIENCY
vs. CHARGE CURRENTMAX17005A toc08
CHARGE CURRENT (A)
EFFICIENCY (%)
2 CELLS3 CELLS
4 CELLS
VAA LOAD REGULATIONMAX17005A toc11
LOAD CURRENT (mA)
VOLTAGE (V)
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
LDO LOAD REGULATION
MAX17005A toc09
LDO CURRENT (mA)
LDO VOLTAGE (V)51015202530
LDO LINE REGULATION
MAX17005A toc10
INPUT VOLTAGE (V)
LDO VOLTAGE (V)22101214161820
VAA vs. TEMPERATURE
MAX17005A toc12
TEMPERATURE (°C)
(V)80-40-2002040
HIGH-SIDE MOSFET OFF-TIME AND
SWITCHING FREQUENCY vs. BATTERY VOLTAGE
MAX17005A toc13
BATTERY VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
HIGH-SIDE MOSFTE OFF-TIME (1410124682
VIN = 20V
HIGH-SIDE MOSFET OFF-TIME
SWITCHING FREQUENCY
ADAPTER REMOVALMAX17005A toc16
200ms/div
5.00V5.00V
5.00V
ADAPTER CURRENT
vs. ADAPTER VOLTAGEMAX17005A toc14
ADAPTER VOLTAGE (V)
ADAPTER CURRENT (mA)510
BATTERY LEAKAGE
MAX17005A toc15
BATTERY VOLTAGE (V)
BATTERY LEAKAGE CURRENT (161868241012
020
ypical Operating Characteristics (continued)(Circuit of Figure 1, adapter = 19V, battery = 10V, ISET = 1.05V, VCTL= GND, TA= +25°C, unless otherwise noted.)
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
Pin Description
PINNAMEFUNCTIONDCIN Charger Bias Supply Input. Bypass DCIN with a 1μF capacitor to PGND.
2 AGND Analog Ground CSIP Output Current-Sense Positive Input. Connect a current-sense resistor from CSIP to CSIN. CSIN Output Current-Sense Negative Input
5 IINP
Input Current-Monitor Output. IINP sources the current proportional to the current sensed across
CSSP and CSSN. The transconductance from (CSSP - CSSN) to IINP is 2.8μA/mV. See the Analog
Input Current-Monitor Output section to configure the current monitor for a particular gain setting. BATT Battery Voltage Feedback Input ACOKAC Detect Output. This open-drain output is high impedance when ACIN is lower than VAA/2.
Connect a 10k pullup resistor from LDO to ACOK.CSSP Input Current Sense for Positive Input. Connect a current-sense resistor from CSSP to CSSN. CSSN Input Current-Sense Negative Input
10 ISET
Dual Mode™ Input for Setting Maximum Charge Current. ISET can be configured either with a
resistor voltage-divider or with a PWM signal from 128Hz to 500kHz. If there is no clock edge
within 20ms, ISET defaults to analog input mode. Pull ISET to GND to shut down the charger. In the
MAX17015A, when the adapter is absent, drive ISET above 1V to enable IINP during battery
discharge. When the adapter is reinserted, ISET must be released to the correct control level within
300ms.
11 PGND Power Ground Connection for MOSFET Drivers
12 DLO Low-Side Power-MOSFET Driver Output. Connect to low-side n-channel MOSFET gate.
13 LDO Linear Regulator Output. LDO provides the power to the MOSFET drivers. LDO is the output of the 5.4V
linear regulator supplied from DCIN. Bypass LDO with a 4.7μF ceramic capacitor from LDO to PGND.
14 BST High-Side Driver Supply. Connect a 0.68μF capacitor from BST to LX.
15 DHI High-Side Power-MOSFET Driver Output. Connect to high-side n-channel MOSFET gate.
16 LX High-Side Driver Source Connection. Connect a 0.68μF capacitor from BST to LX.
17 ACIN AC Adapter Detect Input. ACIN is the input to an uncommitted comparator.
18 VAA 4.2V Voltage Reference and Device Power-Supply Input. Bypass VAA with a 1μF capacitor to GND.
19 CC Voltage Regulation Loop-Compensation Point. Connect 3k and 0.01μF capacitor in series from
CC to GND.
20 VCTL Battery Voltage Adjust Input. VCTL sets the number of cells and adjusts the voltage per cell. The
adjustment range is 4.2V to 4.4V per cell. See the Setting Charge Voltage section.BP Backside Paddle. Connect the backside paddle to analog ground.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance ChargersBATT
ADAPTER
BSTCSSPCSSN
DHI
DLO
PGND
RS1
15mΩ
CSIN
CSIP
BATT
BATTERY
VCTL
ISET
LDO
AGND
IINP
VAA
ADAPTER
PWM SIGNAL
22.6kΩ
0.68μF
0.1μF
0.01μF
200kΩ
3kΩ
200kΩ
CIN
COUT
RS2
10mΩ
Q1b
1μF
4.7μF
ONLY FOR MAX17015A
SYSTEM LOAD
1μF
CIN = 2 x 4.7μF
COUT = 4.7μF
L1 = 2μH
2MΩ
Q1a
DCIN
0.1μF
RACIN1
RACIN2
ACIN
ACOK
LDO10kΩ
MAX17005A
MAX17006A
MAX17015A
Figure 1. Typical Operating Circuit
Detailed DescriptionThe MAX17005A/MAX17006A/MAX17015A include all
the functions necessary to charge Li+, NiMH, and NiCd
batteries. An all n-channel synchronous-rectified step-
down DC-DC converter is used to implement a preci-
sion constant-current, constant-voltage charger. The
charge current and input current-limit sense amplifiers
have low-input offset errors (250μV typ), allowing the
use of small-valued sense resistors.
The MAX17005A/MAX17006A/MAX17015A use a new
thermally optimized high-frequency architecture. With this
new architecture, the switching frequency is adjustedto
control the power dissipation in the high-side
MOSFET. Benefits of the new architecture include:
reduced output capacitance and inductance, resulting in
smaller printed-circuit board (PCB) area and lower cost.
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers CSA
A = 17.5V/V
CSSN
CSSP
Gm =
2.8μA/mV
IINP
GMS
CSIN
CSIP
GMI
ISET
26mV
CHARGER
SHUTDOWN
CELL
SELECT
LOGIC
BATT
VAA
VCTL
GMV
LOWEST
VOLTAGE
CLAMP
CSI
60mV
PWM
FILTER
DHI
DLO
PGND
BST
LEVEL
SHIFTHIGH-SIDE
DRIVER
LOW-SIDE
DRIVER
CCMP
IMIN
IMAX
IZX
10mV
OVP
DC-DC
CONVERTER
110mV
10mV
BDIV
BDIV
VCTL + 100mV
5.4V LINEAR
REGULATOR
4.2V
REFERENCE
DCIN
LDO
VAA
POWER
FAIL
LDO
AGND
BATTVAA/2
ACOK
LDO
ACIN
MAX17005A
MAX17006A
MAX17015A
CSA
A = 17.5V/V
Figure 2. Functional Diagram
The MAX17005A/MAX17006A/MAX17015A feature a
voltage-regulation loop (CCV) and two current-regula-
tion loops (CCI and CCS). The loops operate indepen-
dently of each other. The CCV voltage-regulation loop
monitors BATT to ensure that its voltage never exceeds
the voltage set by VCTL. The CCI battery charge cur-
rent-regulation loop monitors current delivered to BATT
to ensure that it never exceeds the current limit set by
ISET. The charge current-regulation loop is in control as
long as the battery voltage is below the set point. When
the battery voltage reaches its set point, the voltage-
regulation loop takes control and maintains the battery
voltage at the set point. A third loop (CCS) takes control
and reduces the charge current when the adapter cur-
rent exceeds the input current limit.
The MAX17005A/MAX17006A/MAX17015A have single-
point compensation. The two current loops are internal-
ly compensated while the voltage loop is compensated
with a series RC network at CC pin. See the CC Loop
Compensationsection for the resistor and capacitor
selection. A functional diagram is shown in Figure 2.
MAX17005A/MAX17006A/MAX17015A
1.2MHz, Low-Cost,
High-Performance Chargers
Setting Charge VoltageThe VCTL input adjusts the battery-output voltage,
VBATT, and determines the number of cells. For 3- and
4-cell applications, use the MAX17005A; for 2- and
3-cell applications, use the MAX17006A. Use the
MAX17015A to adjust the cell number and set the cell
voltage with a resistive voltage-divider from the output.
Based on the version of the part, the number of cells
and the level of VCTL should be set as in Table 1:
The MAX17005A/MAX17006A support from 4.2V/cell to
4.4V/cell, whereas the MAX17015A supports minimum
2.1V. The maximum voltage is determined with the
dropout performance of IC. When the required voltage
falls outside the range available with the MAX17005A or
MAX17006A, the MAX17015A should be used.
The charge-voltage regulation for the MAX17005A and
MAX17006A is calculated with the following equations:
for 3-cell selection of MAX17005A and MAX17006A,
4.2V > VCTL > 2.4V:
for 2- or 4-cell selection of MAX17006A or MAX17005A,
respectively, 0 < VCTL < 1.8V. Connect VCTL to GND
or to VAAfor default 4.2V/cell battery-voltage setting.
For the MAX17015A, connect VCTL to GND to set the FB
regulation point to 2.1V. The charge-voltage regulation is
calculatedwith the following equation:
There are two constraints in choosing R7 and R8. The
resistors cannot be too small since they discharge the
battery, and they cannot be too large because FB pin
consumes less than 1μA of input bias current. Pick R8
to be approximately 10kΩand then calculate R7.
FB regulation error (±0.5% max) and the tolerance of R7
and R8 both contribute to the error on the battery volt-
age. Use 0.1% feedback resistors for best accuracy.
Setting Charge CurrentThe voltage at ISET determines the voltage across cur-
rent-sense resistor RS2. ISET can accept either analog
or digital inputs. The full-scale differential voltage
between CSIP and CSIN is 80mV (8A for RS2 = 10mΩ)
for the analog input, and 60mV (6A for RS2 = 10mΩ) for
the digital PWM input.
When the MAX17005A/MAX17006A/MAX17015A power
up and the charger is ready, if there is no clock edge
within 20ms, the circuit assumes ISET is an analog
input, and disables the PWM filter block. To configure
the charge current, force the voltage on ISET according
to the following equation:
The input range for ISET is from 0 to VAA/2. To shut
down the charger, pull ISET below 26mV.
If there is a clock edge on ISET within 20ms, the PWM
filter is enabled and ISET accepts digital PWM input.
The PWM filter has a DAC with 8-bit resolution that cor-
responds to equivalent VCSIP-CSINsteps.mVCHGISET=×240RRCHGREGFBSETPOINT__=×+87V
CELLVCTL=+426.VV
CELLVCTL=+4242..-
VERSIONNO. OF CELLS LEVELMAX17005A 3 2.4V < VCTL < 4.2V
MAX17005A 4 0 < VCTL < 1.8V
MAX17006A 2 0 < VCTL < 1.8V
MAX17006A 3 2.4V < VCTL < 4.2V
MAX17015A Sets FB VCTL = GND or VCTL = VAA
Table 1. Cell ConfigurationCSIN
BATTERY
COUT
MAX17015A
Figure 3. The MAX17015A Charge-Voltage Regulation Feedback
Network
