MAX8815AETB+-MAX8815AETB+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX8815AETB+T ,1A, 97% Efficiency, 30µA Quiescent Current, Step-Up Converter with True ShutdownFeaturesThe MAX8815A DC-DC step-up converter is a high-effi- ♦ Up to 97% Efficiency with Internal S ..
MAX8819AETI+ ,PMIC with Integrated Charger and Smart Power Selector™ in a 4mm x 4mm TQFNApplicationsDLIM1DLIM2MP3 PlayersBATPortable GPS Devices+Li+/Li-PolyENABLE SYSTEM EN123BATTERYLow-P ..
MAX881R ,Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PAApplications Ordering InformationCell Phones Wireless ModemsPART TEMP RANGE PIN-PACKAGEPCS Phones T ..
MAX881REUB ,Low-Noise Bias Supply in MAX with Power-OK for GaAsFET PAfeatures include a power-OK (POK) output that sig-nals when the negative voltage is within 7.5% of ..
MAX881REUB+ ,Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PAApplications Ordering InformationCell Phones Wireless ModemsPART TEMP RANGE PIN-PACKAGEPCS Phones T ..
MAX881REUB-T ,Low-Noise Bias Supply in µMAX with Power OK for GaAsFET PAfeatures include a power-OK (POK) output that sig-nals when the negative voltage is within 7.5% of ..
MB86294S ,Grraphiics Controller specificationsapplications, they are not intended to be used in actual equipment. Also, Fujitsu accepts no respo ..
MB86391 ,MPEG2 1chip Audio/Video EncoderMPEG2 1chip Audio/Video Encoder MB86391 Product Specification Revision 1.1 12, November 2001 Copy ..
MB86434 ,5V Single Power Supply Audio Interface Unit (AIU)FUJITSU SEMICONDUCTORDS04-23003-1EDATA SHEETASSPCMOS5V Single Power Supply Audio Interface Unit (AI ..
MB86437PFV ,3 V Single Power Supply Audio Interface Unit (AIU)FUJITSU SEMICONDUCTORDS04-23005-3EDATA SHEETASSPCMOS3 V Single Power Supply Audio Interface Unit (A ..
MB86604L ,SCSI-II Protocol Controller (with single-ended driver/receiver)FUJITSU SEMICONDUCTORDS04-22415-1EDATA SHEETASSP Communication ControlCMOSSCSI-II Protocol Contr ..
MB86604LPFV ,SCSI-II Protocol Controller (with single-ended driver/receiver)FUJITSU SEMICONDUCTORDS04-22415-1EDATA SHEETASSP Communication ControlCMOSSCSI-II Protocol Contr ..

MAX8815AETB+-MAX8815AETB+T
1A, 97% Efficiency, 30µA Quiescent Current, Step-Up Converter with True Shutdown
General Description
The MAX8815A DC-DC step-up converter is a high-effi-
ciency, low quiescent current, synchronous step-up
converter with True Shutdown™ and inrush-current lim-
iting. The MAX8815A generates any output voltage
from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell
Li+/Li polymer battery.
The MAX8815A uses two modes of operation. The first
mode of operation (normal) uses only 30µA (typ) quies-
cent current and allows the converter to switch only
when needed at no load and light loads. Under moder-
ate and heavy loads (typically above 90mA), the
MAX8815A uses a fixed-frequency pulse-width modula-
tion (PWM) technique. This mode allows maximum effi-
ciency at light loads. The second mode of operation is
a fixed-frequency forced-pulse-width modulation
(FPWM) mode where the converter switches at a fixed
frequency irrespective of the load. This mode allows for
easy noise filtering and lower output ripple.
The MAX8815A has a preset 2.5A current limit, allowing
500mA load at 1.8V input and 1A load at 2.5V input when
the output is set to 5V. Features include soft-start, which
limits inrush current during startup, True Shutdown, and
internal compensation. The MAX8815A is available in a
compact 10-pin, 3mm x 3mm TDFN package.
The MAX8815A evaluation kit can help shorten the time
required for system design.
Applications
DSC and DVC
Microprocessor/DSP Core Power
Cell Phones, PDAs, MP3 Players
Portable Handheld Devices
PCMCIA Cards
FeaturesUp to 97% Efficiency with Internal Synchronous
RectifierLow 30µA Quiescent CurrentGuaranteed 500mA Output Current at VOUT= 5V
from 1.8V InputGuaranteed 1A Output Current at 5V from 2.5V
InputLow-Noise Constant Frequency Operation (FPWM
Mode)2MHz PWM Switching FrequencyPreset (5V) or Adjustable OutputControlled Current in Soft-Start Limits Inrush
CurrentTrue ShutdownInternal CompensationOverload/Short-Circuit Protection0.1µA Shutdown CurrentThermal ShutdownCompact 10-Pin, 3mm x 3mm TDFN Package
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
Ordering Information
19-4092; Rev 1; 8/08
EVALUATION KIT
AVAILABLE
PARTPIN-PACKAGETOP MARK
MAX8815AETB+10 TDFN-EP*AUH
True Shutdown is a trademark of Maxim Integrated Products, Inc.
+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
Note:This device operates in the -40°C to +85°C extended
operating temperature range.
BATT
SKIPB
POUT
OUTS
GND
INPUT VOLTAGE
1.2V TO 5.5V
OUTPUT VOLTAGE
5V UP TO 1A
MAX8815A
Simplified Operating Circuit
TOP VIEW
SKIPBOUTSFB
GND23459876
POUTPOUT
BATT
MAX8815A
Pin Configuration
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
ELECTRICAL CHARACTERISTICS
(VOUTS= VPOUT= 5V, VON= VBATT= 3.6V, VSKIPB= GND, TA= -40°C to +85°C, typical values are at TA= +25°C, unless otherwise
noted. Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design and
characterization.)
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.
PARAMETERCONDITIONSMINTYPMAXUNITS
GENERAL
Operating Input Voltage Range1.25.5V
Minimum Startup Voltage1.21.5V
TA = +25°C0.11Shutdown Supply CurrentON = GNDTA = +85°C0.2µA
No load, no switching, VFB = 1.28V1630
Supply CurrentNo load, switching (measured with external feedback);
VPOUT = 5V30µA
OSCILLATOR
Switching Frequency1.82.02.2MHz
Maximum Duty Cycle87.5%
Output-Voltage Adjust Range3.35.0V
No load, TA = +25°C1.2551.2651.275FB Regulation VoltageNo load, TA = -40°C to +85°C (Note 3)1.2521.2651.277V
FB Load Regulation-7.5mV/A
FB Line RegulationVBATT = 1.8V to 5V, IPOUT = 0.5A-10mV/D
TA =+25°C-50-5+50FB Input Leakage CurrentVFB = 1.28V, VOUTS =
VPOUT = VBATT = 5.5VTA = +85°C-5nA
Idle Mode™ Trip Level(Note 4)90mA
ABSOLUTE MAXIMUM RATINGS
OUTS, BATT to GND................................................-0.3V to +6V
POUT to OUTS......................................................-0.3V to +0.3V
PGND (EP) to AGND.............................................-0.3V to +0.3V
FB to GND................................................-0.3V to (VOUT+ 0.3V)
ON, SKIPB to GND............-0.3V to the higher of (VOUTS+ 0.3V)
and (VBATT+ 0.3V)
LX Continuous Current (Note 1)..........................................2.75A
Continuous Power Dissipation (TA= +70°C)
10-Pin TDFN Single-Layer Board (derate 18.5 mW/°C
above +70°C)...........................................................1481.5mW
10-Pin TDFN Multilayer Board (derate 24.4 mW/°C
above +70°C)...........................................................1951.2mW
Junction-to-Case Thermal Resistance (θJC) (Note 2)
10-Pin TDFN.................................................................8.5°C/W
Junction-to-Ambient Thermal Resistance (θJA) (Note 2)
10-Pin TDFN..................................................................41°C/W
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature Range............................-40°C to +150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Note 1:LX has internal clamp diodes to PGND (EP) and VPWR, where VPWR is the internal power node and is the higher of BATT
and OUTS. Applications that forward bias these diodes should take care not to exceed the power-dissipation limits of the
device.
Note 2:Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations, visit /thermal-tutorial.
Idle Mode is a trademark of Maxim Integrated Products, Inc.
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
PARAMETERCONDITIONSMINTYPMAXUNITS
DC-DC SWITCHES
p-Channel On-Resistance0.140.25Ω
n-Channel On-Resistance0.10.17Ω
n-Channel Current Limit2.202.52.75A
p-Channel Turn-Off Current10mA
TA = +25°C0.12OUT Leakage CurrentVLX = VON = 0V, VOUTS =
VPOUT = VBATT = 5.5VTA = +85°C0.2µA
TA = +25°C0.12
LX Leakage Current
VLX = 0V or 5.5V, VOUTS =
VPOUT = VBATT = 5.5V,
VON = 0VTA = +85°C0.2µA
Soft-Start IntervalLoad dependent6ms
Overload Protection Fault Delay16ms
Startup into a Short Circuit6ms
LOGIC INPUTS
ON Input Low LevelVOUTS = VPOUT = 0V and 1.5V < VBATT < 5.5V0.5V
ON Input High LevelVOUTS = VPOUT = 0V and 1.5V < VBATT < 5.5V, VH is the
highter of VPOUT and VBATT
VH -
0.2V
(1.3V
max)
SKIPB Input Low Level3.3V < VPOUT < VOUT < 5.5V0.5V
SKIPB Input High Level3.3V < VPOUT < VOUT < 5.5V1.6V
TA = +25°C0.011ON, SKIPB Input Leakage
Current
VOUTS = VPOUT = VBATT =
5.5VTA = +85°C0.02µA
Thermal Shutdown+167°C
ELECTRICAL CHARACTERISTICS (continued)
(VOUTS= VPOUT= 5V, VON= VBATT= 3.6V, VSKIPB= GND, TA= -40°C to +85°C, typical values are at TA= +25°C, unless otherwise
noted. Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design and
characterization.)
Note 3:Guaranteed by design. Not production tested.
Note 4:The idle-mode current threshold is the transition point between fixed-frequency PWM operation and idle-mode operation. The
specification is given in terms of output load current for inductor values shown in the typical application circuits (Figure 1). The
idle-mode transition varies with input-to-output voltage ratio.
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
Typical Operating Characteristics
(VOUTS= VPOUT= 5V, VBATT= VON= 3.6V, VSKIPB= GND.)
EFFICIENCY vs. LOAD
CURRENT, VOUT = 3.3V
MAX8815A toc01
OUTPUT CURRENT (mA)
EFFICIENCY (%)
VIN = 3.0V, SKIP
= 2.5V, SKIP
VIN = 3.0V, FPWM
= 2.5V, FPWM
= 1.8V, FPWM
= 1.5V, FPWM
VIN = 1.8V, SKIP
= 1.5V, SKIP
EFFICIENCY vs. LOAD
CURRENT, VOUT = 5V
MAX8815A toc02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
VIN = 4.2V,
SKIP
SKIP
VIN = 3.6V,
= 3V,
= 2.4V,
= 1.8V,
= 1.5V
FPWM
VIN = 4.2V,
= 3.6V,
= 3V,
= 2.4V,
= 1.8V,
= 1.5V
MAXIMUM LOAD CURRENT
vs. INPUT VOLTAGE
MAX8815A toc03
INPUT VOLTAGE (V)
LOAD CURRENT (A)
VOUT = 5V
VOUT = 3.3V
OUTPUT VOLTAGE
vs.LOAD CURRENT
MAX8815A toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
FPWM
SKIP
VIN = 3.6V,
= 3V,
= 2.5V,
= 1.8V,
= 1.5V
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8815A toc05
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
FPWM
SKIP
VIN = 3.0V,
= 2.5V,
= 1.8V,
= 1.5V
OUTPUT VOLTAGE
vs.INPUT VOLTAGE
MAX8815A toc06
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
EP TEMPERATURE
vs.INPUT VOLTAGE
MAX8815A toc07
INPUT VOLTAGE (V)
EP TEMPERATURE (
MEASURED AT THE BOTTOM SIDE VIA
UNDERNEATH THE EP ON THE MAX8815A
EVALUATION KIT
IOUT = 0.5A
IOUT = 1A
VOUT = 5V
TA = +25°C
INPUT CURRENT
vs.INPUT VOLTAGE, VOUT = 3.3V
MAX8815A toc08
INPUT VOLTAGE (V)
INPUT CURRENT (
TA = -40°C
TA = +25°C
TA = +85°C
INPUT CURRENT
vs. INPUT VOLTAGE, VOUT = 5V
MAX8815A toc09
INPUT VOLTAGE (V)
INPUT CURRENT (
TA = -40°C
TA = +25°C
TA = +85°C
INPUT CURRENT
vs. INPUT VOLTAGE, DURING SHUTDOWN
MAX8815A toc10
INPUT VOLTAGE (V)
INPUT CURRENT (nA)
TA = -40°C
TA = +25°C
TA = +85°C
STARTUP LOAD
vs.INPUT VOLTAGE
MAX8815A toc11
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
TA = +25°C
TA = +85°C
SOFT-START TIME
vs. LOAD CURRENT
MAX8815A toc12
LOAD CURRENT (mA)
SOFT-START TIME (
Typical Operating Characteristics (continued)
(VOUTS= VPOUT= 5V, VBATT= VON= 3.6V, VSKIPB= GND.)
SOFT-START TIME
vs. INPUT VOLTAGE
MAX8815A toc13
INPUT VOLTAGE (V)
SOFT-START TIME (
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
200ns/div
HEAVY-LOAD SWITCHING
WAVEFORMS
50mV/div
AC-COUPLEDVOUT
VLX
ILX
MAX8815A toc14
5V/div
1A/div
IOUT = 500mA
2μs/div
LIGHT-LOAD SWITCHING
WAVEFORMS (SKIPB = LOW)
20mV/div
AC-COUPLED
VOUT
VLX
ILX
MAX8815A toc15
2V/div
500mA/div
IOUT = 10mA
200ns/div
LIGHT-LOAD SWITCHING
WAVEFORMS (SKIPB = HIGH)
20mV/div
AC-COUPLED
VOUT
VLX
ILX
MAX8815A toc16
2V/div
500mA/div
IOUT = 10mA
100μs/div
LINE TRANSIENT
20mV/div
AC-COUPLED
VIN
VOUT
MAX8815A toc17
2V/div
4.2V
1ms/div
LOAD TRANSIENT
VOUT
200mV/div
5V DC OFFSET
500mV/div
MAX8815A toc18
IOUT
800mA
10mA
200μs/div
STARTUP WAVEFORM
(NO LOAD)
VEN
VOUT
VLX
ILX
MAX8815A toc19
5V/div
5V/div
5V/div
1A/div
Typical Operating Characteristics (continued)
(VOUTS= VPOUT= 5V, VBATT= VON= 3.6V, VSKIPB= GND.)
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
Pin Description
PINNAMEFUNCTION
1, 2LXInductor Connection. LX pins are internally connected. Connect the LX pins to the switched side of
the inductor. LX is high impedance in shutdown.BATTSupply Voltage Input. Connect BATT to an input supply between 1.2V and 5V. Bypass BATT to EP
with two 4.7µF ceramic capacitors or one 10µF ceramic capacitor.
4ON
Logic On/Off Input. Drive ON low to place the MAX8815A into shutdown. During shutdown, the
control circuitry, internal switching MOSFET, and synchronous rectifier turn off and LX becomes high
impedance. Drive ON high for normal operation.GNDAnalog Ground
6FB
Feedback Input. Connect FB to POUT to set VOUT = 5V. For other output voltages, connect a resistor-
divider from POUT to GND (see the Setting the Output Voltage section). FB regulates to 1.265V (typ)
and is high impedance in shutdown.OUTSPower Bootstrapped Input. Connect OUTS to POUT through an RC filter.SKIPB
PWM Mode Selection Input. Drive SKIPB low to select the normal mode of operation. Normal mode is
fixed PWM at medium to heavy loads and skip mode at light loads. Drive SKIPB high to select the
forced-PWM mode of operation.
9, 10POUTConverter Output. Bypass POUT to EP with one 22µF tantalum capacitor.
—EPExposed Paddle. Connect to the ground plane to optimize thermal performance. EP is internally
connected to GND. EP must be connected to GND at a single point with a star ground connection.
MAX8815A
1A, 97% Efficiency, 30µA Quiescent Current
Step-Up Converter with True Shutdown
Detailed Description
The MAX8815A current-mode step-up DC-DC switching
converter uses a fixed-frequency PWM architecture with
True Shutdown. In normal mode, the converter switches
when needed, consuming only 30µA of quiescent cur-
rent. In forced-PWM mode (FPWM), the converter
switches every cycle at a constant frequency, thus
enabling noise filtering. The MAX8815A is highly effi-
cient, with an internal switch and synchronous rectifier.
Shutdown reduces the quiescent current to less than
0.1µA. Low quiescent current and high efficiency make
this device ideal for powering portable equipment.
The MAX8815A step-up DC-DC switching converter typ-
ically generates a 3.3V to 5V output voltage from a 1.2V
to 5.5V battery input voltage. The converter operates in
bootstrapped mode with the output powering the device
once the output voltage is ≥3V. The current limit is set at
2.5A to deliver 1A at 5V from a 2.5V input, or 500mA at
5V using a 2-cell 1.8V input. Internal soft-start limits the
inrush current to less than 500mA under no-load condi-
tions during startup.
The MAX8815A switches at a 2MHz frequency, allow-
ing for tiny external components. Internal compensation
further reduces the external component count in cost
and space-sensitive applications. The MAX8815A is
optimized for use in DSC and other applications requir-
ing low quiescent current for maximum battery life.
Figures 1a and 1b show the typical application circuits.SKIPB
POUT
BATT
OUTS
GND
PGND
CONTROL
2MHz
OSCILLATOR
REFERENCE
STARTUP
OSCILLATOR
MAX8815A
Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8815AETB+ \|MAX8815AETB	MAXIM	N/a	7073	avai	1A, 97% Efficiency, 30µA Quiescent Current, Step-Up Converter with True Shutdown
MAX8815AETB+T \|MAX8815AETBT	MAXIM	N/a	62000	avai	1A, 97% Efficiency, 30µA Quiescent Current, Step-Up Converter with True Shutdown