19-3105; Rev 2; 8/96
NUAL
KIT MA
ATION
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EVALU
TA SHE
WS DA
FOLLO
Switch-Mode Regulator with
+5V to ±12V or ±15V Dual Output
The MAX742 DC-DC converter is a controller for dual-output power supplies in the 3W to 60W range. Relying on
simple two-terminal inductors rather than transformers, the
MAX742 regulates both outputs independently to within
±4% over all conditions of line voltage, temperature, and
load current.
The MAX742 has high efficiency (up to 92%) over a wide
range of output loading. Two independent PWM currentmode feedback loops provide tight regulation and operation free from subharmonic noise. The MAX742 can
operate at 100kHz or 200kHz, so it can be used with small
and lightweight external components. Also ripple and
noise are easy to filter. The MAX742 provides a regulated
output for inputs ranging from 4.2V to 10V (and higher with
additional components).
External power MOSFETs driven directly from the MAX742
are protected by cycle-by-cycle overcurrent sensing. The
MAX742 also features undervoltage lockout, thermal shutdown, and programmable soft-start.
If 3W of load power or less is needed, refer to the MAX743
data sheet for a device with internal power MOSFETs.
________________________Applications
DC-DC Converter Module Replacement
____________________________Features
o Specs Guaranteed for In-Circuit Performance
o Load Currents to ±2A
o 4.2V to 10V Input-Voltage Range
o Switches From ±15V to ±12V Under Logic Control
o ±4% Output Tolerance Max Over Temp, Line,
and Load
o 90% Typ Efficiency
o
o
o
o
Low-Noise, Current-Mode Feedback
Cycle-by-Cycle Current Limiting
Undervoltage Lockout and Soft-Start
100kHz or 200kHz Operation
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX742CPP
0°C to +70°C
20 Plastic DIP
MAX742CWP
MAX742C/D
MAX742EPP
MAX742EWP
MAX742MJP
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
20 Wide SO
Dice*
20 Plastic DIP
20 Wide SO
20 CERDIP
* Contact factory for dice specifications
__________Simplified Block Diagram
Distributed Power Systems
Computer Peripherals
+5V
INPUT
MAX742
__________________Pin Configuration
CC-
TOP VIEW
FB+ 1
CC+ 2
19 CSL+
AGND 3
R -SENSE
PWM
S -DRIVE
20 CSH+
18 GND
AV 4
100/200 5
17 EXT+
MAX742
16 PUMP
12/15 6
-VO
+2.0V
VREF
OSC
+VO
15 PDRV
VREF 7
P
14 EXT-
SS 8
S +DRIVE
PWM
R +SENSE
13 V+
CC- 9
12 CSH-
FB- 10
N
11 CSLCC+
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX742
_______________General Description
