MAX742 Maxim, MAX742 Datasheet

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MAX742

Manufacturer Part Number
MAX742
Description
Switch-Mode Regulator with +5V to 12V or 15V Dual Output
Manufacturer
Maxim
Datasheet

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The MAX742 DC-DC converter is a controller for dual-out-
put 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 current-
mode feedback loops provide tight regulation and opera-
tion 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 shut-
down, 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
19-3105; Rev 2; 8/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Description
__________________Pin Configuration
TOP VIEW
DC-DC Converter Module Replacement
Distributed Power Systems
Computer Peripherals
100/200
AGND
12/15
VREF
CC+
CC-
FB+
FB-
AV
SS
________________________________________________________________ Maxim Integrated Products
10
1
2
3
4
5
6
7
8
9
MAX742
DIP/SO
+5V to ±12V or ±15V Dual Output
20
19
18
17
14
13
12
16
15
11
CSH+
CSL+
GND
EXT+
PUMP
PDRV
EXT-
V+
CSH-
CSL-
Switch-Mode Regulator with
____________________________Features
__________Simplified Block Diagram
* Contact factory for dice specifications
______________Ordering Information
MAX742CPP
MAX742CWP
MAX742C/D
MAX742EPP
MAX742EWP
MAX742MJP
Specs Guaranteed for In-Circuit Performance
Load Currents to ±2A
4.2V to 10V Input-Voltage Range
Switches From ±15V to ±12V Under Logic Control
±4% Output Tolerance Max Over Temp, Line,
and Load
90% Typ Efficiency
Low-Noise, Current-Mode Feedback
Cycle-by-Cycle Current Limiting
Undervoltage Lockout and Soft-Start
100kHz or 200kHz Operation
MAX742
PART
CC-
+2.0V
VREF
CC+
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
R
S
S
R
PWM
PWM
+SENSE
-SENSE
OSC
+DRIVE
-DRIVE
+5V
INPUT
20 Plastic DIP
20 Wide SO
Dice*
20 Plastic DIP
20 Wide SO
20 CERDIP
PIN-PACKAGE
P
N
+VO
-VO
1

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