MAX1692EUB/T-MAX1692EUB+-MAX1692EUB+T-MAX1692EUB-T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1692EUB+ ,Low-Noise, 5.5V Input, PWM Step-Down RegulatorFeaturesThe MAX1692 is a low-noise, pulse-width-modulated♦ +2.7V to +5.5V Input Range(PWM), DC-DC s ..
MAX1692EUB+T ,Low-Noise, 5.5V Input, PWM Step-Down RegulatorELECTRICAL CHARACTERISTICS (continued)(V = +3.6V, SYNC/PWM = GND, V = 3.6V, SHDN = IN, circuit of F ..
MAX1692EUB+T ,Low-Noise, 5.5V Input, PWM Step-Down RegulatorApplicationsBP 2 9 LXCellular Phones CPU I/O SuppliesMAX1692GND 3 8 SHDNCordless Phones Notebook Ch ..
MAX1692EUB-T ,Low-Noise, 5.5V Input, PWM Step-Down Regulatorapplications. It is also♦ 100% Duty Cycle in Dropoutuseful for +3V or +5V fixed input
MAX1692EUB-T ,Low-Noise, 5.5V Input, PWM Step-Down Regulatorfeatures an internal synchronous rectifier for♦ 95% Efficiencyhigh efficiency; it requires no exter ..
MAX1693EUB ,USB Current-Limited Switches with Fault Blankingfeatures toOrdering Informationensure that the USB port is protected. Built-in thermal-overload pro ..
MAX4494AKA-T ,SC70 / Low-Power / General-Purpose / Dual-Supply / Rail-to-Rail Op AmpsELECTRICAL CHARACTERISTICS(V = +5V, V = -5V, R = 100kΩ to ground, T = -40°C to +125°C. Typical valu ..
MAX4494AUA ,SC70 / Low-Power / General-Purpose / Dual-Supply / Rail-to-Rail Op AmpsFeaturesThe MAX4493/MAX4494/MAX4495 single/dual/quad 770µA Supply Current per Amplifiergeneral-pur ..
MAX4495AUD+ ,SC70, Low-Power, General-Purpose, Dual-Supply, Rail-to-Rail Op AmpsFeaturesThe MAX4493/MAX4494/MAX4495 single/dual/quad ♦ 770µA Supply Current per Amplifiergeneral-pu ..
MAX4501CSA ,Low-Voltage, SPST, CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—+5V Supply (continued)(V+ = +4.5V to +5.5V, V = 2.4V, V = 0.8V, T = T to ..
MAX4501CSA+ ,Low-Voltage, SPST, CMOS Analog SwitchesELECTRICAL CHARACTERISTICS—+5V Supply(V+ = +4.5V to +5.5V, V = 2.4V, V = 0.8V, T = T to T , unless ..
MAX4501CUK/ ,Low-Voltage, SPST, CMOS Analog SwitchesGeneral Description _________

MAX1692EUB/T-MAX1692EUB+-MAX1692EUB+T-MAX1692EUB-T
Low-Noise, 5.5V Input, PWM Step-Down Regulator
General Description
The MAX1692 is a low-noise, pulse-width-modulated
(PWM), DC-DC step-down converter. It powers logic
and transmitters in small wireless systems such as cellu-
lar phones, communicating PDAs, and handy-terminals.
The device features an internal synchronous rectifier for
high efficiency; it requires no external Schottky diode.
Excellent noise characteristics and fixed-frequency
operation provide easy post-filtering. The MAX1692 is
ideally suited for Li-Ion battery applications. It is also
useful for +3V or +5V fixed input applications.
The device operates in one of four modes. Forced PWM
mode operates at a fixed frequency regardless of the
load. Synchronizable PWM mode allows an external
switching frequency to control and minimize harmonics.
Idle Mode™ (PWM/PFM) extends battery life by switch-
ing to a PFM pulse-skipping mode during light loads.
Shutdown mode places the device in standby, reduc-
ing quiescent supply current to under 0.1μA.
The MAX1692 can deliver over 600mA. The output volt-
age can be adjusted from 1.25V to VINwith the input
range of +2.7V to +5.5V. Other features of the
MAX1692 include high efficiency, low dropout voltage,
and a 1.2%-accurate 1.25V reference. It is available in
a space-saving 10-pin μMAX package with a height of
only 1.11mm.
Applications
Cellular PhonesCPU I/O Supplies
Cordless PhonesNotebook Chipset Supplies
PDAs and Handy-TerminalsBattery-Operated Devices
(1 Li-Ion or 3 NiMH/NiCd)
Feature+2.7V to +5.5V Input RangeAdjustable Output from 1.25V to VIN600mA Guaranteed Output Current95% EfficiencyNo Schottky Diode Required85μA Quiescent Current100% Duty Cycle in Dropout750kHz Fixed-Frequency PWM OperationSynchronizable Switching FrequencyAccurate Reference: 1.25V (±1.2%)Small 10-Pin μMAX Package
Low-Noise, 5.5V-Input
PWM Step-Down Regulator
PGND
SHDN
SYNC/PWMREF
GND
MAX1692
TOP VIEW
LIMFB
μMAX
19-1400; Rev 0; 11/98
PART
MAX1692EUB-40°C to +85°C
TEMP. RANGEPIN-PACKAGE
10 μMAX
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Pin Configuration
Ordering Information
Typical Operating Circuit
MAX1692FB
SYNC/PWM
PGND
LIM
SHDNR1
VIN = 2.7V TO 5.5VVOUT = 1.25V TO VIN
AGNDREF
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= +3.6V, SYNC/PWM = GND, VLIM= 3.6V, SHDN= IN, circuit of Figure 2; 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.
IN, BP, SHDN, SYNC/PWM, LIM to GND................ -0.3V to +6V
BP to IN.................................................................-0.3V to +0.3V
PGND to GND......................................................-0.3V to +0.3V
LX to PGND.................................................-0.3V to (VIN + 0.3V)
FB, REF to GND......................................... -0.3V to (VBP + 0.3V)
Reference Current............................................................. ±1mA
LX Peak Current (internally limited)......................................1.6A
Continuous Power Dissipation (TA= +70°C)
10-Pin μMAX (derate 5.6mW/°C above +70°C)............444mW
Operating Temperature Range..........................-40°C to +85°C
Maximum Junction Temperature....................................+150°C
Storage Temperature Range............................ -65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
(Note 1)
FB = OUT, VIN= VLIM = 2.7V to 5.5V,
IOUT= 0
SHDN= LX = GND, includes LX leakage
current
SYNC/PWM = GND, VFB= 1.4V,
LX unconnected
ILX= 180mA
SYNC/PWM = IN, FB = REF
VFB= 1.4V
VIN= 3.6V
FB = OUT, VIN= VLIM= 5.5V, IOUT= 0
(duty cycle = 23%) (Note 2)
Duty cycle = 100% to 23%
IOUT= 0 to 600mA, LIM = IN or
IOUT= 0 to 250mA, LIM = GND
LIM = IN
VFB= 1.4V
LIM = GND
CONDITIONS0.110Shutdown Supply Current 85140Quiescent Current80120160Pulse-Skipping Current-Limit
Threshold50100mA-450-850-1600N-Channel Current-Limit
Threshold
0.751.21.55A0.350.60.85P-Channel Current-Limit
ThresholdVREFVINOutput Adjustment Range
1.2231.2491.2752.75.5VINInput Voltage Range
0.5Ω0.40.8NRDS(ON)N-Channel On-Resistance
0.4Ω0.30.65PRDS(ON)P-Channel On-Resistance1.2231.2491.275VFBFeedback Voltage+1Line Regulation-1.3Load Regulation-500.0150IFBFB Input Current
UNITSMINTYPMAXSYMBOLPARAMETER
VIN= 5.5V, VLX= 0 or 5.5VμA-200.120LX Leakage Current
kHz650750830fOSCOscillator Frequency
kHz5001000SYNCCapture Range100dutyMAXMaximum Duty Cycle 22dutyMINMinimum Duty Cycle
IREF= 0V1.2351.2501.265VREFReference Output Voltage
FB = OUT, VIN= 2.7V to 5.5V,
IOUT= 0 to 600mA, LIM = IN or
IOUT= 0 to 250mA, LIM = GND
VOUTOutput Voltage
ILX= 180mAVIN= 2.7V
VIN= 3.6V
VIN= 2.7V
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Note 1:Guaranteed by minimum and maximum duty-factor tests.
Note 2:The following equation can be used to calculate FB accuracy for output voltages other than 1.232V:
(see Feedback Voltage vs. Load Current)
VFB= VFB (NOMINAL)- (Line Reg) (VOUT / VIN- 0.23) / 0.77 - (Load Reg)(IOUT + 0.5 ·IRIPPLE) / IMAX
where: Line Reg = the line regulation
Load Reg = the load regulation
IRIPPLE= (1- VOUT / VIN) · VOUT / (fOSC ·L) where L is the inductor value
IMAX= 250mA (LIM = GND) or 600mA (LIM = IN)
Note 3:Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +3.6V, SYNC/PWM = GND, VLIM= 3.6V, SHDN= IN, circuit of Figure 2; TA= 0°C to +85°C, unless otherwise noted. Typical
values are at TA= +25°C.)
High or low
0 ≤IREF≤50μA
SHDN, SYNC/PWM, LIM
CONDITIONS500SYNC/PWM Minimum Pulse Width315Reference Load Regulation-10.11Logic Input Current
UNITSMINTYPMAXSYMBOLPARAMETER
(Note 1)
FB = OUT, VIN= VLIM= 2.7V to 5.5V,
IOUT= 0
SYNC/PWM = GND, LX = unconnected,
VFB= 1.4V
FB = OUT, VIN= VLIM= 5.5V, IOUT= 0
(duty cycle = 23%) (Note 2)
VFB=1.4V
LIM = IN
CONDITIONSREFVINOutput Adjustment Range
1.2131.2852.75.5VINInput Voltage Range140Quiescent Current1.2131.285VFBFeedback Voltage-5050IFBFB Input Current0.71.6
P-Channel Current-Limit
ThresholdN-Channel Current-Limit
Threshold
UNITSMINMAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS
(VIN= +3.6V, SYNC/PWM = GND, VLIM= 3.6V, SHDN= IN, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.) (Note 3)
LIM = GND
SYNC/PWM = IN, FB = REF-15110
SHDN= LX = GND, includes LX leakage currentμA10Shutdown Supply Current
kHz630840fOSCOscillator Frequency
IREF= 0V1.2301.268VREFReference Output Voltage
VINrising, typical hysteresis is 85mVV2.32.5UVLOUndervoltage Lockout
Threshold
SHDN, SYNC/PWM, LIMV2VIHLogic Input High
SHDN, SYNC/PWM, LIMV0.4VILLogic Input Low
SHDN, SYNC/PWM, LIMμA-11Logic Input Current
SHDN, SYNC/PWM, LIMV0.4VILLogic Input Low
VINrising, typical hysteresis is 85mVV2.32.42.5UVLOUndervoltage Lockout Threshold
SHDN, SYNC/PWM, LIMV2VIHLogic Input High
FB = OUT, VIN= 2.7V to 5.5V,
IOUT= 0 to 600mA, LIM = IN or
IOUT= 0 to 250mA, LIM = GND
VOUTOutput Voltage
OUTPUT VOLTAGE vs.
LOAD CURRENT
AX1692-10
LOAD CURRENT (mA)
(V
VIN = 2.7V
VOUT = 1.8V
R1 = 138kΩ
R2 = 301kΩ
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
DROPOUT VOLTAGE vs.
LOAD CURRENT
AX1692-01
LOAD CURRENT (mA)
(m
VOUT = 2.5V
VOUT = 3.3V100010010
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
AX1692-02
LOAD CURRENT (mA)
(%
VIN = 5.0V
VIN = 3.6V
LIM = IN
R1 = 505kΩ
R2 = 301kΩ100010010
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
AX1692-03
LOAD CURRENT (mA)
(%
VIN = 5.0V
VIN = 2.7V
VIN = 3.6V
LIM = IN
R1 = 309kΩ
R2 = 301kΩ100010010
EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.8V)
AX1692-04
LOAD CURRENT (mA)
(%
VIN = 2.7V
VIN = 5.0V
VIN = 3.6V
LIM = IN
R1 = 138kΩ
R2 = 301kΩ
BATTERY INPUT CURRENT vs.
INPUT VOLTAGE
AX1692-07
INPUT VOLTAGE (V)
IN
(m
SYNC/PWM = IN
VOUT = 3.3V
VOUT = 1.8V
VOUT = 2.5V
FEEDBACK VOLTAGE
vs. LOAD CURRENT
AX1692-05
LOAD CURRENT (mA)
(V
VIN = 5.0V
R1 = 309kΩ
R2 = 301kΩ
SYNC/PWM = GND
LIM = IN
LIM = GND
BATTERY INPUT CURRENT vs.
INPUT VOLTAGE
AX1692-06
INPUT VOLTAGE (V)
IN
(μ
VOUT = 1.8V
SYNC/PWM = GND
TA = +85°C
TA = +25°C
TA = -40°C
BATTERY INPUT CURRENT vs. INPUT
VOLTAGE AND TEMPERATURE
INPUT VOLTAGE (V)
IN
(m
VOUT = 1.8V
SYNC/PWM = IN
TA = +85°C
TA = +25°C
TA = -40°C
Typical Operating Characteristics
(SYNC/PWM = GND, circuit of Figure 2, L = Sumida CD43-100, TA = +25°C, unless otherwise noted.)
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
AX1692-11
SUPPLY VOLTAGE (V)
(k
TA = +85°C
TA = +25°C
TA = -40°C
IOUT = 200mA
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
AX1692-12
INPUT VOLTAGE (V)
(A
VOUT = 1.8V
LIM = IN
LIM = GND
500μs/div
LOAD-TRANSIENT RESPONSE
VLX
5V/div
VOUT
AC-COUPLED
100mV/div
IOUT
2.5A/div
AX1692-17
ILOAD = 30mA to 700mA
2ms/div
START-UP FROM SHUTDOWN
VSHDN
2V/div
IIN
0.5A/div
VOUT
1V/div
AX1692-14
2ms/div
HEAVY LOAD SWITCHING WAVEFORMS
VIN = 5V, VOUT = 3.3V, IOUT = 700mA
VLX
5V/div
ILX
0.5A/div
VOUT
AC-
COUPLED
100mV/div
2ms/div
LINE-TRANSIENT RESPONSE
VIN = 3V to 5V, IOUT = 300mA
VIN
AC-
COUPLED
2V/div
VOUT
AC-
COUPLED
50mV/div
X1692-18
2ms/div
RECOVERY FROM 100% DUTY CYCLE
VIN = 3.3V to 4.5V , VOUT = 3.3V, IOUT = 500mA
VIN
2V/div
VLX
5V/div
VOUT
AC-
COUPLED
500mV/div
X1692-19
Typical Operating Characteristics (continued)
(SYNC/PWM = GND, TA = +25°C, unless otherwise noted.)
100kHz1MHz10MHz
SWITCHING HARMONICS AND NOISE
1mV/div
AX1692-22
1ms/divIOUT = 500mA
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
NAMEFUNCTIONINSupply Voltage Input. Input range from +2.7V to +5.5V. Bypass with a 10μF capacitor.BPSupply Bypass Pin. Internally connected to IN. Bypass with a 0.1μF capacitor. Do notconnect to an
external power source other thanIN.
PINGNDGroundREF1.25V, 1.2% Reference Output. Capable of delivering 50μA to external loads. Bypass with a 0.22μF capaci-
tor to GND.SHDNActive-Low, Shutdown-Control Input. Reduces quiescent current to 0.1μA. In shutdown, output becomes
high impedance.SYNC/
PWM
Oscillator Sync and Low-Noise, Mode-Control Input.
SYNC/PWM = IN (Forced PWM Mode)
SYNC/PWM = GND (PWM/PFM Mode)
An external clock signal connected to this pin allows for LX switching synchronization.LIMCurrent-Limit Select Input. Connect LIM to GND for 0.6A current limit or LIM to IN for 1.2A current limit.FBFeedback InputPGNDPower GroundLX Inductor Connection to the Drains of the Internal Power MOSFETs
Pin Description
PFM CURRENT COMPARATOR
CONTROL AND
DRIVER LOGICSLOPE COMPENSATION
PWM
COMPARATOR
NEGLIM
COMPARATOR
5mV IN PFM
ADJ. IN PWM
PGND
0.1X
SENSE FET
SENSE FET
0.1X
10Ω
CHIP
SUPPLY
PWM
REF
SYNC/
PWM
PFM
COMPARATOROVERVOLTAGE
COMPARATOR
PWM ON
SIGNAL40mV
REF
REF
12mV
120mV
RAMP
GEN
SYNC
CELL
LIM COMPARATOR
REF
GND
REF
SHDNMAX1692
Figure 1. Simplified Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1692EUB+T \|MAX1692EUBT	MAXIM	N/a	5000	avai	Low-Noise, 5.5V Input, PWM Step-Down Regulator
MAX1692EUB-T \|MAX1692EUBT	MAX	N/a	25	avai	Low-Noise, 5.5V Input, PWM Step-Down Regulator
MAX1692EUB-T \|MAX1692EUBT	MAXIM	N/a	3453	avai	Low-Noise, 5.5V Input, PWM Step-Down Regulator
MAX1692EUB/T \|MAX1692EUBT	MAX	N/a	91	avai	Low-Noise, 5.5V Input, PWM Step-Down Regulator
MAX1692EUB+ \|MAX1692EUB	MAXIM	N/a	5020	avai	Low-Noise, 5.5V Input, PWM Step-Down Regulator
MAX1692EUB+T \|MAX1692EUBT	MAXIN	N/a	2716	avai	Low-Noise, 5.5V Input, PWM Step-Down Regulator