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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX767 Datasheet

5V-to-3.3V / Synchronous / Step-Down Power-Supply Controller

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MAX767 pdf
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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.
VOUT
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
VCC 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
VCC 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
Call toll free 1-800-998-8800 for free samples or literature.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX767 Datasheet

5V-to-3.3V / Synchronous / Step-Down Power-Supply Controller

No Preview Available !

MAX767 pdf
5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
ABSOLUTE MAXIMUM RATINGS
VCC to GND .................................................................-0.3V, +7V
PGND to GND ........................................................................±2V
BST to GND ...............................................................-0.3V, +15V
LX to BST.....................................................................-7V, +0.3V
Inputs/Outputs to GND
(ON, REF, SYNC, CS, FB, SS) .....................-0.3V, VCC + 0.3V
DL to PGND .....................................................-0.3V, VCC + 0.3V
DH to LX...........................................................-0.3V, BST + 0.3V
REF Short to GND.......................................................Momentary
REF Current.........................................................................20mA
Continuous Power Dissipation (TA = +70°C)
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
Operating Temperature Ranges:
MAX767CAP/MAX767_CAP.................................0°C to +70°C
MAX767EAP/MAX767_EAP ..............................-40°C to +85°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = ON = 5V, GND = PGND = SYNC = 0V, IREF = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
VCC Input Supply Range
Output Voltage (FB)
CONDITIONS
0mV < (CS - FB) < 80mV,
4.5V < VCC < 5.5V
(includes load and
line regulation)
MAX767, MAX767T
MAX767R
MAX767S
MIN TYP MAX UNITS
4.5 5.5 V
3.17 3.35 3.46
3.32 3.50 3.60
V
3.46 3.65 3.75
Load Regulation
(CS - FB) = 0mV to 80mV
2.5 %
Line Regulation
VCC Fault Lockout Voltage
Current-Limit Voltage
VCC = 4.5V to 5.5V
Falling edge, hysteresis = 1%
CS - FB
0.1 %
3.80 4.20 V
80 100 120 mV
SS Source Current
2.50 4
6.5 µA
SS Fault Sink Current
2 mA
Reference Voltage (REF)
MAX767, MAX767R, MAX767S
MAX767T
3.24 3.30 3.36
3.26 3.30 3.34
V
VCC Standby Current
VCC Quiescent Current
Oscillator Frequency
Oscillator SYNC Range
ON = 0V, VCC = 5.5V
FB = CS = 3.5V
SYNC = 3.3V
SYNC = 0V or 5V
120 200 µA
0.7 1.0 mA
260 300 340
kHz
200
240 350 kHz
SYNC High Pulse Width
200 ns
SYNC Low Pulse Width
200 ns
SYNC Rise/Fall Time
Oscillator Maximum Duty Cycle
Input Low Voltage
Input High Voltage
Input Current
Not tested
SYNC = 3.3V
SYNC = 0V
SYNC, ON
ON
SYNC
SYNC, ON = 0V or 5V
89 92
95
2.40
VCC - 0.5
200 ns
%
0.8 V
V
±1 µA
DL Sink/Source Current
DL = 2V
1A
DH Sink/Source Current
(BST - LX) = 4.5V, DH = 2V
1A
DL On Resistance
DH On Resistance
High or low
High or low, (BST - LX) = 4.5V
7
7
2 _______________________________________________________________________________________


Part Number MAX767
Description 5V-to-3.3V / Synchronous / Step-Down Power-Supply Controller
Maker Maxim
Total Page 20 Pages
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MAX767 pdf
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