MAX767 Maxim, MAX767 Datasheet
MAX767
Manufacturer Part Number
MAX767
Description
5V-to-3.3V / Synchronous / Step-Down Power-Supply Controller
Manufacturer
Maxim
Datasheet
1.MAX767.pdf
(20 pages)
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The MAX767 is a high-efficiency, synchronous buck
controller IC dedicated to converting a fixed 5V supply
into a tightly regulated 3.3V output. Two key features set
this device apart from similar, low-voltage step-down
switching regulators: high operating frequency and all
N-channel construction in the application circuit. The
300kHz operating frequency results in very small, low-
cost external surface-mount components.
The inductor, at 3.3µH for 5A, is physically at least five
times smaller than inductors found in competing solu-
tions. All N-channel construction and synchronous rectifi-
cation result in reduced cost and highest efficiency.
Efficiency exceeds 90% over a wide range of loading,
eliminating the need for heatsinking. Output capacitance
requirements are low, reducing board space and cost.
The MAX767 is a monolithic BiCMOS IC available in
20-pin SSOP packages. For other fixed output voltages
and package options, please consult the factory.
________________________Applications
19-0224; Rev 2; 8/94
Call toll free 1-800-998-8800 for free samples or literature.
™ Pentium is a trademark of Intel.
_______________General Description
________Typical Application Circuit
Local 5V-to-3.3V DC-DC Conversion
Microprocessor Daughterboards
Power Supplies up to 10A or More
REF
V
CC
MAX767
GND
ON
PGND
BST
________________________________________________________________ Maxim Integrated Products
DH
CS
DL
FB
LX
5V-to-3.3V, Synchronous, Step-Down
PowerPC is a trademark of IBM.
4.5V TO 5.5V
3.3 H
INPUT
OUTPUT
AT 5A
3.3V
Power-Supply Controller
____________________________Features
Ordering Information continued at end of data sheet.
*
MAX767CAP
MAX767RCAP
MAX767SCAP
MAX767TCAP
MAX767C/D
__________________Pin Configuration
______________Ordering Information
Contact factory for dice specifications.
>90% Efficiency
700µA Quiescent Supply Current
120µA Standby Supply Current
4.5V-to-5.5V Input Range
Low-Cost Application Circuit
All N-Channel Switches
Small External Components
Tiny Shrink-Small-Outline Package (SSOP)
Predesigned Applications:
Fixed Output Voltages Available:
TOP VIEW
Standard 5V to 3.3V DC-DC Converters up to 10A
High-Accuracy Pentium P54C VR-Spec Supply
3.3V (Standard)
3.45V (High-Speed Pentium™)
3.6V (PowerPC™)
PART
TEMP. RANGE
SYNC
GND
GND
GND
GND
REF
V
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
ON
CS
SS
CC
10
1
2
3
4
5
6
7
8
9
MAX767
SSOP
PACKAGE
20 SSOP
20 SSOP
20 SSOP
20 SSOP
Dice*
PIN-
20
19
18
17
16
15
14
13
12
11
FB
DH
LX
BST
DL
V
V
N.C.
PGND
GND
CC
CC
±1.8%
±1.8%
±1.8%
±1.2% 3.3V
REF.
TOL.
–
V
3.3V
3.45V
3.6V
OUT
–
1
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