MAX8668ETEQ+-MAX8668ETEX+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX8668ETEX+T ,1.5MHz Dual Step-Down DC-DC Converters with Dual LDOs and Individual EnablesELECTRICAL CHARACTERISTICS(V = V = 3.6V, T = -40°C to +85°C, unless otherwise noted. Typical values ..
MAX866ESA ,3.3V/5V or Adjustable-Output / Single-Cell DC-DC ConvertersELECTRICAL CHARACTERISTICS(Circuit of Figure 2, V = 1.2V, I = 0mA, T = +25°C, unless otherwise note ..
MAX866ESA+ ,3.3V/5V or Adjustable Output, Single-Cell DC-DC ConvertersELECTRICAL CHARACTERISTICS(Circuit of Figure 2, V = 1.2V, I = 0mA, T = +25°C, unless otherwise note ..
MAX866EUA+ ,3.3V/5V or Adjustable-Output / Single-Cell DC-DC ConvertersApplicationsPART TEMP. RANGE PIN-PACKAGEPagers MAX866C/D 0°C to +70°C Dice*Remote Controls MA ..
MAX8677AETG+ ,1.5A Dual-Input, USB/AC Adapter Charger and Smart Power SelectorFeaturesThe MAX8677A is an integrated 1-cell Li+ charger and♦ Complete Charger and Smart Power Sele ..
MAX8677AETG+T ,1.5A Dual-Input, USB/AC Adapter Charger and Smart Power Selectorfeatures include overvoltage protection (OVP),charge status and fault outputs, power-OK monitors,Or ..
MB84256A-10LLP , CMOS 256K-BIT LOW POWER SRAM
MB84256A-10LPF , CMOS 256K-BIT LOW POWER SRAM
MB84VD21183EM-70PBS , Stacked MCP (Multi-Chip Package) FLASH MEMORY & SRAM CMOS
MB84VD21194EM-70PBS , Stacked MCP (Multi-Chip Package) FLASH MEMORY & SRAM CMOS
MB84VD22181FM-70PBS , 32M (X16) FLASH MEMORY & 4M (X16) STATIC RAM
MB84VD22182EE-90 ,32M (x 8/x16) FLASH MEMORY & 4M (x 8/x16) STATIC RAMFUJITSU SEMICONDUCTORDS05-50204-2EDATA SHEETStacked MCP (Multi-Chip Package) FLASH MEMORY & SRAMCMO ..

MAX8668ETEQ+-MAX8668ETEX+T
1.5MHz Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables
General Description
The MAX8667/MAX8668 dual step-down converters
with dual low-dropout (LDO) linear regulators are
intended to power low-voltage microprocessors or
DSPs in portable devices. They feature high efficiency
with small external component size. The step-down
converters are adjustable from 0.6V to 3.3V (MAX8668)
or factory preset (MAX8667) with guaranteed output
current of 600mA for OUT1 and 1200mA for OUT2. The
1.5MHz hysteretic-PWM control scheme allows for tiny
external components and reduces no-load operating
current to 100µA with all outputs enabled. Dual low-qui-
escent-current, low-noise LDOs operate down to 1.7V
supply voltage. The MAX8667/MAX8668 have individ-
ual enables for each output, maximizing flexibility.
The MAX8667/MAX8668 are available in the space-
saving, 3mm x 3mm, 16-pin thin QFN package.
Applications
Cell Phones/Smartphones
PDA and Palmtop Computers
Portable MP3 and DVD Players
Digital Cameras, Camcorders
PCMCIA Cards
Handheld Instruments
FeaturesTiny, Thin QFN 3mm x 3mm PackageIndividual EnablesStep-Down Converters
600mA Guaranteed Output Current on OUT1
1200mA Guaranteed Output Current on OUT2
Tiny Size 2.2µH Chip Inductor (0805)
Output Voltage from 0.6V to 3.3V (MAX8668)
Ultra-Fast Line and Load Transients
Low 25µA Supply Current EachLDOs
300mA Guaranteed
Low 1.7V Minimum Supply Voltage
Low Output Noise
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
IN34
OUT4
EN3
LX2PGND2LX1
OUT1 (FB1)109
EN1
EN2
OUT2 (FB2)
REF
GND
EN4
MAX8667
MAX8668
OUT3
IN12
PGND1
THIN QFN
(3mm x 3mm)
TOP VIEW
( ) ARE FOR THE MAX8668
Pin Configuration
IN34
LX2LX1
OUT2OUT1
2.6V TO 5.5V
OUT3
OUT4
REF
GND
IN12
300mA
300mA
EN1
EN2
EN3
EN4
600mA1.2A
PGND1PGND2
10μF4.7μF
4.7μF4.7μF
0.01μF
2.2μH2.2μH
2.2μF2.2μF
MAX8667
Typical Operating Circuit
19-0784; Rev 1; 7/07
EVALUATION KITAVAILABLE
Ordering Information continued at the end of data sheet.
Selector Guide appears at the end of data sheet.
Ordering Information
Note:All MAX8667/MAX8668 parts are in a 16-pin, thin QFN,
3mm x 3mm package and operate in the -40°C to +85°C
extended temperature range.
+Denotes a lead-free package.
PARTPKG CODETOP MARK
MAX8667ETEAA+T1633-4AEQ
MAX8667ETEAB+T1633-4AFI
MAX8667ETEAC+T1633-4AFM
MAX8667ETECQ+T1633-4AFN
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN34= VIN12= 3.6V, TA = -40°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
IN12, IN34, FB1, FB2, EN1, EN2, EN3, EN4, OUT1,
OUT2, REF to GND............................................-0.3V to +6.0V
OUT3,
OUT4 to GND.....-0.3V to the lesser of + 6V or (VIN34+ 0.3V)
PGND1, PGND2 to GND.......................................-0.3V to +0.3V
LX1, LX2 Current..........................................................1.5A RMS
LX1, LX2 to GND (Note 1).......................-0.3V to (VIN12 + 0.3V)
Continuous Power Dissipation (TA= +70°C)
16-Pin, 3mm x 3mm Thin QFN
(derate 20.8mW/°C above +70°C).............................1667mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature.....................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITS
IN34 Supply RangeVIN12 ≥ VIN341.75.5V
IN12 Supply RangeMAX8668, VIN12 ≥ VIN342.65.5V
IN12 Suppy RangeMAX8667, VIN12 ≥ VIN342.85.5V
TA = +25°C1µAShutdown Supply Current,
IIN12 + IIN34VIN12 = VIN34 = 4.2V VEN_ = 0VTA = +85°C0.05µA
No Load Supply Current,
IIN12 + IIN34MAX8667ETEJS+, all regulators enabled100150µA
UNDERVOLTAGE LOCKOUT
VIN12 rising2.42.52.6VIN12 UVLOVIN12 hysteresis0.1V
VIN34 rising1.51.61.7VIN34 UVLOVIN34 hysteresis0.1V
THERMAL SHUTDOWN
ThresholdTA rising+160°C
Hysteresis15°C
REFERENCE
Reference Bypass Output
Voltage0.5910.6000.609V
REF Supply Rejection2.6V ≤ (VIN12 = VIN34) ≤ 5.5V0.15mV/V
LOGIC AND CONTROL INPUTS
EN_ Input Low Level1.7V ≤ VIN34 ≤ 5.5V
2.6V ≤ VIN12 ≤ 5.5V0.4V
EN_ Input High Level1.7V ≤ VIN34 ≤ 5.5V
2.6V ≤ VIN12 ≤ 5.5V1.44V
TA = +25°C-1+1EN_ Input Leakage CurrentVIN12 = VIN34 = 5.5VTA = +85°C0.001µA
STEP-DOWN CONVERTERS
Minimum Adjustable Output
VoltageMAX86680.6V
Note 1: LX_ has internal clamp diodes to GND and IN12. Applications that forward bias these diodes should take care not to exceed
the IC’s package-dissipation limits.
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
PARAMETERCONDITIONSMINTYPMAXUNITS
Maximum Adjustable Output
VoltageMAX86683.3V
TA = +25°C0.5880.6000.612FB1, FB2 Regulation VoltageMAX8668, no load,
VFB_ fallingTA = -40°C to +85°C0.5820.6000.618V
TA = +25°C1.2741.3001.326OUT1, OUT2 Regulation VoltageMAX8667ETEJS+, no load, VOUT_
fallingTA = -40°C to +85°C1.2611.3001.339V
FB1, FB2 Line RegulationMAX8668, VIN12 = 2.6V to 5.5V0.01%/V
OUT1, OUT2 Line RegulationMAX8667, VIN12 = 2.8V to 5.5V0.05%/V
MAX8668, shutdown mode0.1FB1, FB2 Bias CurrentMAX8668, VFB1 = 0.5V0.01µA
pMOSFET switch (ILIMP1)7009001100OUT1 Current LimitnMOSFET rectifier (valley current)5007501000mA
pMOSFET switch (ILIMP2)133316672000OUT2 Current LimitnMOSFET rectifier (valley current)120015001800mA
pMOSFET switch, ILX1 = -400mA0.30.6OUT1 On-ResistancenMOSFET rectifier, ILX1 = 400mA0.30.6Ω
pMOSFET switch, ILX2 = -400mA0.120.27OUT2 On-ResistancenMOSFET rectifier, ILX2 = 400mA0.120.27Ω
Rectifier-Off Current Threshold
(ILXOFF)60120mA
TA = +25°C-1+1LX Leakage CurrentLX_ = 5.5VTA = +85°C0.1µA
Minimum On-Time100ns
Minimum Off-Time50ns
LDO REGULATORS
Supply CurrentEach LDO20µA
1mA load, TA = +25°C-1.5+1.5Output-Voltage Accuracy1mA to 300mA load-3.0+3.0%
Line RegulationVIN34 = 3.6V to 5.5V, 1mA load0.003%/V
Dropout VoltageVIN34 = 1.8V, 300mA load130250mV
Current LimitVOUT3, VOUT4 90% of nominal value375420465mA
Soft-Start Ramp TimeTo 90% of final value0.1ms
Output Noise100Hz to 100kHz, 30mA load, VOUT3 and VOUT4 = 2.8V75µVRMS
Power-Supply Rejection Ratiof < 1kHz, 30mA load57dB
Shutdown Output Resistance1kΩ
TIMING (See Figure 2)
OUT1, OUT225Power-On Time (tPWRON)OUT3, OUT445µs
OUT1, OUT215Enable Time (tEN)OUT3, OUT435µs
ELECTRICAL CHARACTERISTICS (continued)
(VIN34= VIN12= 3.6V, TA = -40°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
Typical Operating Characteristics
(VIN12 = VIN34 = 3.6V, circuit of Figure4, VOUT1 = 1.2V, VOUT2 = 1.8V, VOUT3 = 2.8V, VOUT4 = 2.8V, TA = +25°C, unless otherwise noted.)
OUT1 EFFICIENCY vs. LOAD CURRENT
(VOUT1 = 1.2V)
MAX8667/88 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)1
ONLY OUT1 ENABLED
OUT2 EFFICIENCY vs. LOAD CURRENT
(VOUT2 = 1.8V)
MAX8667/88 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
ONLY OUT2 ENABLED0.80
OUT1 LOAD REGULATION
MAX8667/88 toc03
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
OUT2 LOAD REGULATION
MAX8667/88 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
OUT1 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (600mA LOAD)
MAX8667/88 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUT2 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (1200mA LOAD)
MAX8667/88 toc06
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX8667/88 toc07
LOAD CURRENT (mA)
SWITCHING FREQUENCY (kHz)
OUT2
OUT1
NO-LOAD SUPPLY CURRENT vs. SUPPLY
VOLTAGE ALL REGULATOR ENABLED
MAX8667/88 toc08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY VOLTAGE
RISING
SUPPLY VOLTAGE
FALLING
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE OUT1 AND OUT2 ONLY
MAX8667/88 toc09
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SUPPLY VOLTAGE
RISING
SUPPLY VOLTAGE
FALLING
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
NO-LOAD SUPPLY CURRENT vs. SUPPLY
VOLTAGE OUT3 AND OUT4 ONLY
MAX8667/88 toc10
SUPPLY VOLTAGE (V)
IN34
VIN12 = 5.5V
VIN34 VOLTAGE
RISING
VIN34 VOLTAGE
FALLING
OUT3 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (300mA LOAD)
MAX8667/88 toc11
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)100200300
OUT3 DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8667/88 toc12
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX8667/88 toc13
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
IN12 = IN34
2.4Ω LOAD ON OUT1
3.6Ω LOAD ON OUT2
NO LOAD ON OUT3
NO LOAD ON OUT4
40μs/div
ENABLE WAVEFORMS
EN1/EN2/
EN3/EN4
VOUT1
VOUT2
5V/div
2V/div
2V/div
2V/div
2V/div
2A/div
2A/div
2A/div
MAX8667/88 toc14
VOUT4
IL1
VOUT3
IL2
IIN12 + IIN34
40μs/div
SHUTDOWN WAVEFORMS
EN1/EN2/
EN3/EN4
VOUT1
VOUT2
5V/div
1V/div
1V/div
1V/div
1V/div
MAX8667/88 toc15
VOUT4
VOUT3
Typical Operating Characteristics (continued)
(VIN12 = VIN34 = 3.6V, circuit of Figure4, VOUT1 = 1.2V, VOUT2 = 1.8V, VOUT3 = 2.8V, VOUT4 = 2.8V, TA = +25°C, unless otherwise noted.)
10μs/div
OUT1 LOAD TRANSIENT
VOUT1
IOUT1
100mV/div
(AC-COUPLED)
200mA/div
200mA/div
MAX8667/88 toc16
IL1
300mA
10mA10mA
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
10μs/div
OUT2 LOAD TRANSIENT
VOUT2
IOUT2
200mV/div
(AC-COUPLED)
500mA/div
500mA/div
MAX8667/88 toc17
IL2
600mA
10mA10mA
10μs/div
OUT3 LOAD TRANSIENT
VOUT3
IOUT3
50mV/div
(AC-COUPLED)
200mA/div
MAX8667/88 toc18
300mA
0mA0mA
10μs/div
OUT4 LOAD TRANSIENT
VOUT4
IOUT4
50mV/div
(AC-COUPLED)
200mA/div
MAX8667/88 toc19
300mA
0mA0mA
10μs/div
OUT1 LIGHT-LOAD SWITCHING
WAVEFORMS
VOUT1
VLX1
IL1
20mV/div
MAX8667/88 toc20
2V/div
100mA/div
500μA LOAD
40μs/div
OUT2 LIGHT-LOAD SWITCHING
WAVEFORMS
VOUT2
VLX2
IL2
20mV/div
MAX8667/88 toc21
2V/div
500mA/div
500μA LOAD
400ns/div
OUT1 HEAVY-LOAD SWITCHING
WAVEFORMS
VOUT1
VLX1
IL1
20mV/div
MAX8667/88 toc22
2V/div
500mA/div
500mA LOAD
Typical Operating Characteristics (continued)
(VIN12 = VIN34 = 3.6V, circuit of Figure4, VOUT1 = 1.2V, VOUT2 = 1.8V, VOUT3 = 2.8V, VOUT4 = 2.8V, TA = +25°C, unless otherwise noted.)
MAX8667/MAX8668
Typical Operating Characteristics (continued)
(VIN12 = VIN34 = 3.6V, circuit of Figure4, VOUT1 = 1.2V, VOUT2 = 1.8V, VOUT3 = 2.8V, VOUT4 = 2.8V, TA = +25°C, unless otherwise noted.)
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
1ms/div
OUT3 NOISE
MAX8667/88 toc25
100μV/div
VOUT3 = 2.80V
ILOAD = 100Ω
1ms/div
OUT4 NOISE
MAX8667/88 toc26
100μV/div
VOUT4 = 3.30V
ILOAD = 100Ω
400ns/div
OUT2 HEAVY-LOAD SWITCHING
WAVEFORMS
VOUT2
VLX2
IL2
20mV/div
MAX8667/88 toc23
2V/div
500mA/div
500mA LOAD
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8667/88 toc24
FREQUENCY (kHz)
PSRR (dB)
VOUT3 = 2.80V
ILOAD = 100Ω
COUT3 = 4.7μF
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
Pin Description
NAMEPINMAX8667MAX8668FUNCTIONEN3EN3Enable Input for Regulator 3. Drive EN3 high or connect to IN34 to turn on regulator 3. Drive low
to turn off regulator 3 and reduce input quiescent current.OUT3OUT3Output of Regulator 3. Bypass OUT3 with a 4.7µF ceramic capacitor to GND. OUT3 is
discharged to GND through an internal 1kΩ in shutdown.IN34IN34
Input Voltage for LDO Regulators 3 and 4. Supply voltage range is from 1.7V to 5.5V. This
supply voltage must not exceed VIN12. Connect a 4.7µF or larger ceramic capacitor from IN34
to ground.OUT4OUT4Output of Regulator 4. Bypass OUT4 with a 4.7µF ceramic capacitor to GND. OUT4 is
discharged to GND through an internal 1kΩ in shutdown.EN4EN4Enable Input for Regulator 4. Drive EN4 high or connect to IN34 to turn on regulator 4. Drive low
to turn off regulator 4 and reduce input quiescent current.GNDGNDGroundREFREFReference Output. Bypass REF with a 0.01µF ceramic capacitor to GND.OUT2—Feedback Input for Regulator 2. Connect OUT2 directly to the output of step-down regulator 2.FB2
Feedback Input for Regulator 2. Connect FB2 to the center of a resistor feedback divider
between the output of regulator 2 and ground to set the output voltage. See the Setting the
Output Voltages and Voltage Positioning section.PGND2PGND2Power Ground for Step-Down Regulator 2LX2LX2Inductor Connection for Regulator 2IN12IN12
Input Voltage for Step-Down Regulators 1 and 2. Supply voltage range is from 2.6V to 5.5V. This
supply voltage must not be less than VIN34. Connect a 10µF or larger ceramic capacitor from
IN12 to ground.LX1LX1Inductor Connection for Regulator 1PGND1PGND1Power Ground for Step-Down Regulator 1OUT1—Feed b ack Inp ut for Reg ul ator 1. C onnect OU T1 d i r ectl y to the outp ut of step - d ow n r eg ul ator 1.FB1
Feedback Input for Regulator 1. Connect FB1 to the center of a resistor feedback divider
between the output of regulator 1 and ground to set the output voltage. See the Setting the
Output Voltages and Voltage Positioning section.EN1EN1E nab l e Inp ut for Reg ul ator 1. D r i ve E N 1 hi g h or connect to IN 12 to tur n on step - d ow n r eg ul ator 1.r i ve l ow to tur n off the r eg ul ator and r ed uce i np ut q ui escent cur r ent.EN2EN2E nab l e Inp ut for Reg ul ator 2. D r i ve E N 2 hi g h or connect to IN 12 to tur n on step - d ow n r eg ul ator 2.r i ve l ow to tur n off the r eg ul ator and r ed uce i np ut q ui escent cur r ent.EPEPExposed Paddle. Connect to GND, PGND1, PGND2, and circuit ground.
MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
REF
UVLO
REF AND BIAS
GND
OUT
GND
GND
OUT
GND
IN34
1.7V TO 5.5VIN12
2.8V TO 5.5V
(2.6V TO 5.5V)
GND
LX1
LX2
REF
OUT3
OUT4
PWRON LOGIC
AND ENABLESEN3
EN4
EN1
EN2
PGND2
OUT1
(FB1)
OUT2
(FB2)
PGND1
OUT1
OUT2
OUT3
OUT4
LDO
LDO
STEP-DOWN
STEP-DOWN
() ARE FOR THE MAX8668
Figure1. Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8668ETEQ+	MAXIM	N/a	900	avai	1.5MHz Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables
MAX8668ETEX+T \|MAX8668ETEXT	MAXIM	N/a	165000	avai	1.5MHz Dual Step-Down DC-DC Converters with Dual LDOs and Individual Enables