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MAX8734EEI

Description
0.2 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO28
CategoryPower/power management    The power supply circuit   
File Size1MB,32 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric Compare View All

MAX8734EEI Overview

0.2 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO28

MAX8734EEI Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
Parts packaging codeSSOP
package instruction0.150 INCH, 0.025 INCH PITCH, MO-137AF, QSOP-28
Contacts28
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage24 V
Minimum input voltage4.5 V
Nominal input voltage12 V
JESD-30 codeR-PDSO-G28
JESD-609 codee0
length9.89 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.2 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP28,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)245
Certification statusNot Qualified
Maximum seat height1.73 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency500 kHz
technologyBICMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.9 mm
Base Number Matches1
19-3355; Rev 0; 8/04
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
General Description
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.
Features
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
MAX8732/MAX8733/MAX8734
Ordering Information
PART
PIN-
TEMP RANGE
PACKAGE
5V/3V
SWITCHING
FREQUENCY
200kHz/300kHz
400kHz/500kHz
200kHz/300kHz or
400kHz/500kHz
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
TOP VIEW
N.C. 1
PGOOD 2
ON3 3
ON5 4
ILIM3 5
SHDN 6
FB3 7
REF 8
FB5 9
PRO 10
ILIM5 11
SKIP 12
TON 13
28 BST3
27 LX3
26 DH3
25 LDO3
24 DL3
Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
MAX8734
23 GND
22 OUT3
21 OUT5
20 V+
19 DL5
18 LDO5
17 V
CC
16 DH5
15 LX5
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
BST5 14
QSOP
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.

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