MAX5088 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 2.2MHz, 2A Buck Converters with an Integrated High-Side Switch

19-3944; Rev 1; 5/06
EVAALVUAAILTAIOBNLEKIT
2.2MHz, 2A Buck Converters with an
Integrated High-Side Switch
General Description
The MAX5088/MAX5089 high-frequency, DC-DC con-
verters with an integrated n-channel power MOSFET
provide up to 2A of load current. The MAX5088
includes an internal power MOSFET to enable the
design of a nonsynchronous buck topology power sup-
ply. The MAX5089 is for the design of a synchronous
buck topology power supply. These devices operate
from a 4.5V to 5.5V or 5.5V to 23V input voltage and a
200kHz to 2.2MHz resistor-programmable switching
frequency. The voltage-mode architecture with a peak
switch current-limit scheme provides stable operation
up to a 2.2MHz switching frequency. The MAX5088
includes a clock output for driving a second DC-DC
converter 180° out-of-phase and a power-on-reset
(RESET) output. The MAX5089 includes a power-good
output and a synchronous rectifier driver to drive an
external low-side MOSFET in the buck converter config-
uration for high efficiency.
The MAX5088/MAX5089 protect against overcurrent
conditions by utilizing a peak current limit as well as
overtemperature shutdown providing a very reliable
and compact power source for point-of-load regulation
applications. Additional features include synchroniza-
tion, internal digital soft-start, and an enable input. The
MAX5088/MAX5089 are available in a thermally
enhanced, space-saving 16-pin TQFN (5mm x 5mm)
package and operate over the -40°C to +125°C tem-
perature range.
Applications
xDSL Modem Power Supply
Automotive Radio Power Supply
Servers and Networks
IP Phones/WLAN Access Points
Features
♦ 4.5V to 5.5V or 5.5V to 23V Input Voltage Range
♦ Output Voltage Adjustable Down to 0.6V
♦ 2A Output Current
♦ Synchronous Rectifier Driver Output (MAX5089)
for Higher Efficiency
♦ Resistor-Programmable Switching Frequency
from 200kHz to 2.2MHz
♦ External Synchronization and Enable (On/Off)
Inputs
♦ Clock Output for Driving Second Converter 180°
Out-Of-Phase (MAX5089)
♦ Integrated 150mΩ High-Side n-Channel Power
MOSFET
♦ Power-On Reset Output (MAX5088)/Power-Good
Output (MAX5089)
♦ Short-Circuit Protection
♦ Thermal-Shutdown Protection
♦ Thermally Enhanced 16-Pin TQFN Package
Dissipates 2.7W
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX5088ATE+ -40°C to +125°C
MAX5089ATE+ -40°C to +125°C
+Denotes lead-free package.
16 TQFN
16 TQFN
T1655-2
T1655-2
Pin Configurations
TOP VIEW
12 11 10 9
Selector Guide
PART
MAX5088ATE
CONFIGURATION
Nonsynchronous
Buck
MAX5089ATE Synchronous Buck
FEATURES
RESET Output,
Clock Output
PGOOD Output,
Synchronous FET
Driver
SYNC 13
RESET 14
BST/VDD 15
EN 16
MAX5088
+ ^EP*
1
2
3
4
8 VL
7 V+
6 BYPASS
5 OSC
Pin Configurations continued at end of data sheet.
*EXPOSED PAD.
THIN QFN
5mm x 5mm
________________________________________________________________ Maxim Integrated Products 1
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