MAX8734 Maxim Integrated Products, MAX8734 Datasheet
MAX8734
Manufacturer Part Number
MAX8734
Description
(MAX8732 - MAX8734) Main Power-Supply Controllers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8734.pdf
(32 pages)
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The MAX8732/MAX8733/MAX8734 dual step-down,
switch-mode power-supply (SMPS) controllers generate
logic-supply voltages in battery-powered systems. The
MAX8732/MAX8733/MAX8734 include two pulse-width
modulation (PWM) controllers, adjustable from 2V to 5.5V
or fixed at 5V and 3.3V. These devices feature two linear
regulators providing 5V and 3.3V always-on outputs. Each
linear regulator provides up to 100mA output current with
automatic linear-regulator bootstrapping to the main
SMPS outputs. The MAX8732/MAX8733/MAX8734 include
on-board power-up sequencing, a power-good (PGOOD)
output, digital soft-start, and internal soft-stop output dis-
charge that prevents negative voltages on shutdown.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant on-time PWM control scheme operates without
sense resistors and provides 100ns response to load tran-
sients while maintaining a relatively constant switching fre-
quency. The unique ultrasonic pulse-skipping mode
maintains the switching frequency above 25kHz, which
eliminates noise in audio applications. Other features
include pulse skipping, which maximizes efficiency in
light-load applications, and fixed-frequency PWM mode,
which reduces RF interference in sensitive applications.
The MAX8732 features a 200kHz/5V and 300kHz/3.3V
SMPS for highest efficiency, while the MAX8733 features
a 400kHz/5V and 500kHz/3.3V SMPS for “thin and light”
applications. The MAX8734 provides a pin-selectable
switching frequency, allowing either 200kHz/300kHz or
400kHz/500kHz operation of the 5V/3.3V SMPSs, respec-
tively. The MAX8732/MAX8733/MAX8734 are available in
28-pin QSOP packages and operate over the extended
temperature range (-40°C to +85°C).
The MAX8732/MAX8733/MAX8734 are pin-for-pin
upgrades to the MAX1777/MAX1977/MAX1999.
The MAX1999 Evaluation Kit can be used to evaluate
the MAX8732/MAX8733/MAX8734.
19-3355; Rev 0; 8/04
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
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.
Notebook and Subnotebook Computers
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
Supply Controllers for Notebook Computers
High-Efficiency, Quad-Output, Main Power-
________________________________________________________________ Maxim Integrated Products
General Description
Applications
MAX8732EEI -40°C to +85°C 28 QSOP
MAX8733EEI -40°C to +85°C 28 QSOP
MAX8734EEI -40°C to +85°C 28 QSOP
Pin Configurations continued at end of data sheet.
No Current-Sense Resistor Needed (MAX8734)
Accurate Current Sense with Current-Sense
Resistor (MAX8732/MAX8733)
1.5% Output Voltage Accuracy
3.3V and 5V 100mA Bootstrapped Linear
Regulators
Internal Soft-Start and Soft-Stop Output
Discharge
Quick-PWM with 100ns Load Step Response
3.3V and 5V Fixed or Adjustable Outputs
(Dual Mode™)
4.5V to 24V Input Voltage Range
Enhanced Ultrasonic Pulse-Skipping Mode
(25kHz min)
Power-Good (PGOOD) Signal
Overvoltage Protection Enable/Disable
PART
TOP VIEW
TEMP RANGE
PGOOD
SHDN
ILIM3
ILIM5
BST5
SKIP
N.C.
ON3
ON5
PRO
TON
FB3
REF
FB5
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Ordering Information
MAX8734
QSOP
Pin Configurations
PIN-
PACKAGE
28
27
26
25
24
23
22
21
20
19
18
17
16
15
BST3
LX3
DH3
LDO3
DL3
GND
OUT3
OUT5
V+
DL5
LDO5
V
DH5
LX5
CC
200kHz/300kHz
400kHz/500kHz
200kHz/300kHz or
400kHz/500kHz
FREQUENCY
Features
SWITCHING
5V/3V
1
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