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MAX8734A Datasheet(PDF) 1 Page - Maxim Integrated Products

Part No. MAX8734A
Description  High-Efficiency, Quad-Output, Main Power-Supply Controllers for Notebook Computers
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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General Description
The MAX8732A/MAX8733A/MAX8734A dual step-down,
switch-mode power-supply (SMPS) controllers generate
logic-supply voltages in battery-powered systems. The
MAX8732A/MAX8733A/MAX8734A 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 out-
puts. Each linear regulator provides up to 100mA output
current with automatic linear-regulator bootstrapping to
the main SMPS outputs. The MAX8732A/MAX8733A/
MAX8734A include on-board power-up sequencing, a
power-good (PGOOD) output, digital soft-start, and inter-
nal soft-stop output discharge that prevents negative volt-
ages on shutdown. Additionally, the outputs are high
impedance when VCC falls below its UVLO set point while
the outputs are enabled.
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 MAX8732A features a 200kHz/5V and 300kHz/3.3V
SMPS for highest efficiency, while the MAX8733A fea-
tures a 400kHz/5V and 500kHz/3.3V SMPS for “thin and
light” applications. The MAX8734A provides a pin-
selectable switching frequency, allowing either 200kHz/
300kHz or 400kHz/500kHz operation of the 5V/3.3V
SMPSs, respectively. The MAX8732A/MAX8733A/
MAX8734A are available in 28-pin QSOP packages and
operate over the extended temperature range
(-40°C to +85°C).
The MAX8732A/MAX8733A/MAX8734A are pin-for-pin
upgrades to the MAX1777/MAX1977/MAX1999.
The MAX1999 evaluation kit (EV kit) can be used to
evaluate the MAX8732A/MAX8733A/MAX8734A.
Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
Features
♦ No Current-Sense Resistor Needed (MAX8734A)
♦ Accurate Current Sense with Current-Sense
Resistor (MAX8732A/MAX8733A)
♦ 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
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-3711; Rev 0; 5/05
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.
PART
TEMP RANGE
PIN-
PACKAGE
5V/3.3V
SWITCHING
FREQUENCY
(kHz)
MAX8732AEEI+ -40°C to +85°C 28 QSOP
200/300
MAX8732AEEI
-40°C to +85°C 28 QSOP
200/300
MAX8733AEEI+ -40°C to +85°C 28 QSOP
400/500
MAX8733AEEI
-40°C to +85°C 28 QSOP
400/500
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
Ordering Information continued at end of data sheet.
+Denotes lead-free package.
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
BST3
LX3
DH3
LDO3
DL3
GND
LX5
OUT3
OUT5
V+
DL5
LDO5
VCC
DH5
BST5
TON
ILIM5
FB5
REF
FB3
ILIM3
ON5
ON3
PGOOD
N.C.
QSOP
TOP VIEW
MAX8734A
SHDN
PRO
SKIP
Pin Configurations
Pin Configurations continued at end of data sheet.




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