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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1692 Datasheet

Low-Noise / 5.5V-Input / PWM Step-Down Regulator

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19-1400; Rev 0; 11/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
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 VIN with 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 Phones
CPU I/O Supplies
Cordless Phones
Notebook Chipset Supplies
PDAs and Handy-Terminals Battery-Operated Devices
(1 Li-Ion or 3 NiMH/NiCd)
Features
o +2.7V to +5.5V Input Range
o Adjustable Output from 1.25V to VIN
o 600mA Guaranteed Output Current
o 95% Efficiency
o No Schottky Diode Required
o 85µA Quiescent Current
o 100% Duty Cycle in Dropout
o 750kHz Fixed-Frequency PWM Operation
o Synchronizable Switching Frequency
o Accurate Reference: 1.25V (±1.2%)
o Small 10-Pin µMAX Package
PART
MAX1692EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
TOP VIEW
IN 1
BP 2
GND 3
REF 4
FB 5
Pin Configuration
MAX1692
µMAX
10 PGND
9 LX
8 SHDN
7 SYNC/PWM
6 LIM
VIN = 2.7V TO 5.5V
C1
C3
IN
SHDN
LIM
MAX1692
LX
FB
BP
AGND
SYNC/PWM
PGND
REF
C4
Typical Operating Circuit
L
VOUT = 1.25V TO VIN
C2
R1
R2
Idle Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1692 Datasheet

Low-Noise / 5.5V-Input / PWM Step-Down Regulator

No Preview Available !

Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
ABSOLUTE MAXIMUM RATINGS
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
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.
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.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
Output Voltage
Output Adjustment Range
Feedback Voltage
VIN
VOUT
VFB
FB = OUT, VIN = VLIM = 2.7V to 5.5V,
IOUT = 0
FB = OUT, VIN = 2.7V to 5.5V,
IOUT = 0 to 600mA, LIM = IN or
IOUT = 0 to 250mA, LIM = GND
(Note 1)
FB = OUT, VIN = VLIM = 5.5V, IOUT = 0
(duty cycle = 23%) (Note 2)
2.7
1.223
1.249
5.5
1.275
1.190 1.232 1.275
VREF
1.223
1.249
VIN
1.275
V
V
V
V
Line Regulation
Duty cycle = 100% to 23%
+1 %
Load Regulation
FB Input Current
P-Channel On-Resistance
N-Channel On-Resistance
P-Channel Current-Limit
Threshold
N-Channel Current-Limit
Threshold
IFB
PRDS(ON)
NRDS(ON)
IOUT = 0 to 600mA, LIM = IN or
IOUT = 0 to 250mA, LIM = GND
VFB = 1.4V
ILX = 180mA
VIN = 3.6V
VIN = 2.7V
ILX = 180mA
VIN = 3.6V
VIN = 2.7V
LIM = GND
LIM = IN
VFB = 1.4V
SYNC/PWM = IN, FB = REF
-50
0.35
0.75
-450
0
-1.3
0.01
0.3
0.4
0.4
0.5
0.6
1.2
-850
50
50
0.65
0.8
0.85
1.55
-1600
100
%
nA
A
mA
Pulse-Skipping Current-Limit
Threshold
80 120 160 mA
Quiescent Current
Shutdown Supply Current
SYNC/PWM = GND, VFB = 1.4V,
LX unconnected
SHDN = LX = GND, includes LX leakage
current
85 140 µA
0.1 10 µA
LX Leakage Current
Oscillator Frequency
SYNC Capture Range
Maximum Duty Cycle
Minimum Duty Cycle
Reference Output Voltage
fOSC
VIN = 5.5V, VLX = 0 or 5.5V
dutyMAX
dutyMIN
VREF
IREF = 0
-20
650
500
100
1.235
0.1
750
1.250
20
830
1000
22
1.265
µA
kHz
kHz
%
%
V
2 _______________________________________________________________________________________


Part Number MAX1692
Description Low-Noise / 5.5V-Input / PWM Step-Down Regulator
Maker Maxim
Total Page 12 Pages
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