MAX747 Maxim, MAX747 Datasheet
MAX747
Manufacturer Part Number
MAX747
Description
High-Efficiency PWM / Step-Down P-Channel DC-DC Controller
Manufacturer
Maxim
Datasheet
1.MAX747.pdf
(12 pages)
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The MAX747 high-efficiency, high-current, step-down
controller drives external P-channel FETs. It provides
90% to 95% efficiency from a 6V supply with load
currents ranging from 50mA up to 2.5A. It uses a
pulse-width-modulating (PWM) current-mode control
scheme to provide precise output regulation and low
output noise. The MAX747’s 4V to 15V input voltage
range, a fixed 5V/adjustable (Dual-Mode™) output, and
a current limit set with an external resistor make this
device ideal for a wide range of applications.
High efficiency is maintained with light loads due to a
proprietary dual-control (Idle-Mode™) scheme that
minimizes switching losses by reducing the switching
frequency at light loads. The low 800µA quiescent
current and ultra-low 0.6µA shutdown current further
extend battery life.
External components are protected by the MAX747’s
cycle-by-cycle current limit. The MAX747 also features a
2V ±1.5% reference, a comparator for low-battery
detection or level translating, as well as soft-start and
shutdown capability.
The MAX746, discussed in a separate data sheet,
functions similarly to the MAX747, but it drives N-channel
logic level FETs on the high side.
________________________Applications
19-0171; Rev 1; 9/93
™ Dual-Mode and Idle-Mode are trademarks of Maxim Integrated Products.
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
__________________Pin Configuration
TOP VIEW
Notebook Power Supplies
Personal Digital Assistants
Battery-Operated Equipment
Cellular Phones
5V to 3.3V Green PC Applications
SHDN
AV+
REF
LBI
CC
SS
FB
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
6
7
MAX747
DIP/SO
14
13
12
11
10
9
8 OUT
High-Efficiency PWM, Step-Down
LBO
GND
V+
EXT
AGND
CS
P-Channel DC-DC Controller
____________________________Features
* Contact factory for dice specifications.
__________Typical Operating Circuit
______________Ordering Information
MAX747CPD
MAX747CSD
MAX747C/D
MAX747EPD
MAX747ESD
MAX747MJD
LOW-BATTERY
6V TO 15V
90% to 95% Efficiency for 50mA to 2.5A
Output Currents
4V to 15V Input Voltage Range
Low 800µA Supply Current
0.6µA Shutdown Current
Drives External P-Channel FETs
Cycle-by-Cycle Current Limiting
2V ±1.5% Accurate Reference Output
Adjustable Soft-Start
Precision Comparator for Power-Fail or
Low-Battery Warning
INPUT
DETECTOR
PART
INPUT
100µF
ON/OFF
REF
SS
SHDN
LBI
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
CC
MAX747
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
V+
FB
AGND
OUT
LBO
GND
AV+
EXT
CS
LOW-BATTERY
DETECTOR
OUTPUT
P
5Om
14 Plastic DIP
14 Narrow SO
Dice*
14 Plastic DIP
14 Narrow SO
14 CERIDIP
0.1µF
PIN-PACKAGE
5O H
OUTPUT
2.3A
5V
430µF
1
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