MAX767 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – 5V-to-3.3V, Synchronous, Step-Down Power-Supply Controller

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5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
_______________General Description
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
Local 5V-to-3.3V DC-DC Conversion
Microprocessor Daughterboards
Power Supplies up to 10A or More
________Typical Application Circuit
INPUT
4.5V TO 5.5V
____________________________Features
o >90% Efficiency
o 700µA Quiescent Supply Current
o 120µA Standby Supply Current
o 4.5V-to-5.5V Input Range
o Low-Cost Application Circuit
o All N-Channel Switches
o Small External Components
o Tiny Shrink-Small-Outline Package (SSOP)
o Predesigned Applications:
Standard 5V to 3.3V DC-DC Converters up to 10A
High-Accuracy Pentium P54C VR-Spec Supply
o Fixed Output Voltages Available:
3.3V (Standard)
3.45V (High-Speed Pentium™)
3.6V (PowerPC™)
______________Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
REF.
TOL.
V_OUT
MAX767CAP 0°C to +70°C 20 SSOP ±1.8% 3.3V
MAX767RCAP 0°C to +70°C
MAX767SCAP 0°C to +70°C
20 SSOP ±1.8% 3.45V
20 SSOP ±1.8% 3.6V
MAX767TCAP 0°C to +70°C 20 SSOP ±1.2% 3.3V
MAX767C/D 0°C to +70°C Dice*
–
–
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
__________________Pin Configuration
V_CC
ON
BST
DH
MAX767 LX
DL
PGND
CS
FB
REF GND
3.3µH
OUTPUT
3.3V
AT 5A
TOP VIEW
CS ₁
SS ₂
ON ₃
GND ₄
GND ₅
GND 6
GND ₇
REF ₈
SYNC ₉
V_{CC 10}
MAX767
20 ^FB
19 ^DH
18 ^LX
17 BST
16 DL
15 VCC
14 VCC
13 PGND
12 N.C.
11 GND
™ Pentium is a trademark of Intel. PowerPC is a trademark of IBM.
SSOP
________________________________________________________________ Maxim Integrated Products 1
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