MAX5073 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – 2.2MHz, Dual-Output Buck or Boost Converter with Internal Power MOSFETs

19-3504; Rev 2; 2/06
EVAALVUAAILTAIOBNLEKIT
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
General Description
The MAX5073 is a dual-output DC-DC converter with inte-
grated high-side n-channel power MOSFETs. Each output
can be configured either as a buck converter or a boost
converter. The device is capable of operating from a wide
5.5V to 23V input voltage range. Each output is program-
mable down to 0.8V in the buck mode and up to 28V in
the boost mode with an output voltage accuracy of ±1%.
In the buck mode, converter 1 and converter 2 can deliv-
er 2A and 1A, respectively. The output switching frequen-
cy of each converter can be programmed from 200kHz to
2.2MHz to avoid harmonics in a radio power supply or to
reduce the size of the power supply. Each output oper-
ates 180° out-of-phase thus reducing input-capacitor rip-
ple current, size, and cost. A SYNC input facilitates
external frequency synchronization. Moreover, a CLKOUT
output provides out-of-phase clock signal with respect to
converter 2, allowing four-phase operation using two
MAX5073 ICs in master-slave configuration.
The MAX5073 includes an internal digital soft-start that
reduces inrush current, eliminates output-voltage over-
shoot, and ensures monotonic rise in output voltage
during power-up. The device includes individual shut-
down and a power-good output for each converter.
Protection features include output short-circuit protec-
tion for buck mode and maximum duty-cycle limit for
boost operation, as well as thermal shutdown.
The MAX5073 is available in a thermally enhanced 28-
pin thin QFN package that can dissipate 2.7W at +70°C
ambient temperature. The device is rated for operation
over the -40°C to +85°C extended, or -40°C to +125°C
automotive temperature range.
Applications
Automotive Radio Power Supply
Point-of-Load DC-DC Converters
Telecom Line Card
Networking Line Card
Power-Over-Ethernet Postregulation for PDs
Features
♦ 4.5V to 5.5V or 5.5V to 23V Input Supply
Voltage Range
♦ 0.8V (Buck) to 28V (Boost) Output Voltage
♦ Two Independent Output DC-DC Converters
with Internal Power MOSFETs
♦ Each Output can be Configured in Buck or Boost
Mode
♦ I_OUT1 and I_OUT2 of 2A and 1A (Respectively) in
Buck Mode
♦ 180° Out-of-Phase Operation
♦ Clock Output for Four Phase Operation
♦ Switching Frequency Programmable from 200kHz
to 2.2MHz
♦ Digital Soft-Start and Sync Input
♦ Individual Converter Shutdown and Power-Good
Output
♦ Short-Circuit Protection (Buck)/Maximum Duty-
Cycle Limit (Boost)
♦ Thermal Shutdown
♦ Thermally Enhanced 28-Pin Thin QFN Package
Dissipates up to 2.7W at +70°C
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
PGOOD2 22
SOURCE1 23
SOURCE1 24
14 BYPASS
13 VL
12 VL
PART
Ordering Information
TEMP RANGE PIN-PACKAGE
PKG
CODE
SGND 25
PGND 26
SOURCE2 27
MAX5073
11 V+
10 OSC
9 N.C.
MAX5073ETI
-40°C to +85°C
28 Thin QFN-EP*
(5mm x 5mm)
T2855-6
MAX5073ETI+ -40°C to +85°C
28 Thin QFN-EP*
(5mm x 5mm)
T2855-6
*EP = Exposed pad.
+Denotes lead-free package.
Ordering Information continued at end of data sheet.
SOURCE2 28
8 SYNC
1234567
THIN QFN
________________________________________________________________ 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.