MAX1692EUB ,Low-Noise / 5.5V-Input / PWM Step-Down RegulatorApplicationsBP 2 9 LXCellular Phones CPU I/O SuppliesMAX1692GND 3 8 SHDNCordless Phones Notebook Ch ..
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MAX1692EUB ,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 ,Low-Noise / 5.5V-Input / PWM Step-Down RegulatorELECTRICAL CHARACTERISTICS(V = +3.6V, SYNC/PWM = GND, V = 3.6V, SHDN = IN, circuit of Figure 2; T = ..
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MAX1692EUB
Low-Noise / 5.5V-Input / PWM Step-Down Regulator
General DescriptionThe 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.
ApplicationsCellular PhonesCPU I/O Supplies
Cordless PhonesNotebook Chipset Supplies
PDAs and Handy-TerminalsBattery-Operated Devices
(1 Li-Ion or 3 NiMH/NiCd)
Features+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
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Pin Configuration
Ordering Information
Typical Operating Circuit
MAX1692
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. Typicalvalues 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
MAX1692
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 - (œLoad Regœ)(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. Typicalvalues are at TA= +25°C.)
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)
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Typical Operating Characteristics
(SYNC/PWM = GND, circuit of Figure 2, L = Sumida CD43-100, TA = +25°C, unless otherwise noted.)
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Typical Operating Characteristics (continued)
(SYNC/PWM = GND, TA = +25°C, unless otherwise noted.)
MAX1692
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Pin Description
Figure 1. Simplified Functional Diagram
