MAX1927 Maxim, MAX1927 Datasheet
MAX1927
Manufacturer Part Number
MAX1927
Description
Low-Output-Voltage / 800mA / PWM Step-Down DC-DC Converters
Manufacturer
Maxim
Datasheet
1.MAX1927.pdf
(12 pages)
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The MAX1927/MAX1928 800mA step-down converters
power low-voltage microprocessors in compact equip-
ment requiring the highest possible efficiency. The
MAX1927/MAX1928 are optimized for generating low
output voltages (down to 750mV) at high efficiency
using small external components. The supply voltage
range is from 2.6V to 5.5V and the guaranteed minimum
output current is 800mA. 1MHz pulse-width modulation
(PWM) switching allows for small external components.
A unique control scheme minimizes ripple at light loads,
while maintaining a low 140µA quiescent current.
The MAX1927/MAX1928 include a low on-resistance
internal MOSFET switch and synchronous rectifier to
maximize efficiency and minimize external component
count. No external diode is needed. 100% duty-cycle
operation allows for a dropout voltage of only 340mV at
800mA. Other features include internal soft-start,
power-OK (POK) output, and selectable forced PWM
operation for lower noise at all load currents.
The MAX1928 is available with several preset output
voltages: 1.5V (MAX1928-15), 1.8V (MAX1928-18), and
2.5V (MAX1928-25). The MAX1927R has adjustable
output range down to 0.75V. The MAX1927/MAX1928
are available in a tiny 10-pin µMAX package.
19-2527; Rev 0; 7/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Output-Voltage, 800mA, PWM Step-Down
WCDMA Handsets
PDAs and Palmtops
DSP Core Power
Battery-Powered Equipment
TOP VIEW
COMP
PWM
GND
REF
FB
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
General Description
MAX1927R
MAX1928
MAX
Pin Configuration
10
Applications
9
8
7
6
POK
BATT
LX
PGND
SHDN
o 800mA Output Current
o Output Voltages from 0.75V to 5V
o 2.6V to 5.5V Input Voltage Range
o Power-OK Output
o No Schottky Diode Required
o Selectable Forced PWM Operation
o 1MHz Fixed-Frequency PWM Operation
o 140µA Quiescent Current
o Soft-Start
o 10-Pin µMAX Package
C
MAX1927REUB
MAX1928EUB15
MAX1928EUB18
MAX1928EUB25
C
PART
C1
2.6V TO 5.5V
R
C
V
IN
C
DC-DC Converters
f
Typical Operating Circuit
BATT
SHDN
COMP
REF
Adj. to 0.75V -40 C to +85 C 10 µMAX
VOLTAGE
OUTPUT
PRESET
Ordering Information
1.5V
1.8V
2.5V
MAX1927R
GND
PGND
-40 C to +85 C 10 µMAX
-40 C to +85 C 10 µMAX
-40 C to +85 C 10 µMAX
PWM
POK
LX
FB
RANGE
TEMP
L1
Features
PIN-
PACKAGE
0.75V AT 800mA
V
OUT
C2
1
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