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PDF MAX1692 Data sheet ( Hoja de datos )
| Número de pieza | MAX1692 | |
| Descripción | Low-Noise / 5.5V-Input / PWM Step-Down Regulator | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX1692 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-1400; Rev 0; 11/98
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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.
1 page  
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Typical Operating Characteristics (continued)
(SYNC/PWM = GND, TA = +25°C, unless otherwise noted.)
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
800
TA = +85°C
750
TA = +25°C
700
TA = -40°C
650
IOUT = 200mA
600
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
HEAVY LOAD SWITCHING WAVEFORMS
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
1.4
LIM = IN
1.1
VSHDN
2V/div
VOUT
1V/div
0.8
LIM = GND
IIN
0.5A/div
VOUT = 1.8V
0.5
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
LOAD-TRANSIENT RESPONSE
START-UP FROM SHUTDOWN
2ms/div
LINE-TRANSIENT RESPONSE
VLX
5V/div
ILX
0.5A/div
VOUT
AC-
COUPLED
100mV/div
2ms/div
VIN = 5V, VOUT = 3.3V, IOUT = 700mA
VLX
5V/div
IOUT
2.5A/div
VOUT
AC-COUPLED
100mV/div
500µs/div
ILOAD = 30mA to 700mA
RECOVERY FROM 100% DUTY CYCLE
VIN
AC-
COUPLED
2V/div
VOUT
AC-
COUPLED
50mV/div
2ms/div
VIN = 3V to 5V, IOUT = 300mA
SWITCHING HARMONICS AND NOISE
VIN
2V/div
VLX
5V/div
VOUT
AC-
COUPLED
500mV/div
1mV/div
2ms/div
VIN = 3.3V to 4.5V , VOUT = 3.3V, IOUT = 500mA
100kHz
IOUT = 500mA
1MHz
1ms/div
10MHz
_______________________________________________________________________________________ 5
5 Page 
Low-Noise, 5.5V-Input,
PWM Step-Down Regulator
Chip Information
TRANSISTOR COUNT: 1462
Package Information
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1692.PDF ] | |
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