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MAX763ACSA+T

P1-P3P4-P6P7-P9P10-P12
__________________General Description
The MAX748A/MAX763A are 3.3V-output CMOS, step-
down switching regulators. The MAX748A accepts
inputs from 3.3V to 16V and delivers up to 500mA. The
MAX763A accepts inputs between 3.3V and 11V and
delivers up to 500mA. Typical efficiencies are 85% to
90%. Quiescent supply current is 1.4mA (MAX763A),
and only 0.2µA in shutdown.
Pulse-width-modulation (PWM) current-mode control pro-
vides precise output regulation and excellent transient
responses. Output voltage accuracy is guaranteed to be
±5% over line, load, and temperature variations.
Fixed-frequency switching allows easy filtering of output
ripple and noise, as well as the use of small external
components. A 22µH inductor works in most applica-
tions, so no magnetics design is necessary.
The MAX748A/MAX763A also feature cycle-by-cycle cur-
rent limiting, overcurrent limiting, undervoltage lockout,
and programmable soft-start protection. The MAX748A
is available in 8-pin DIP and 16-pin wide SO packages;
the MAX763A comes in 8-pin DIP and SO packages.
___________________________Applications
5V-to-3.3V Converters
Cellular Phones
Portable Instruments
Hand-Held Computers
Computer Peripherals
________________________________Features
♦ Up to 500mA Load Currents
♦ Guaranteed 159kHz to 219.5kHz Current-Mode
PWM
♦ 85% to 90% Efficiencies
♦ 1.7mA Quiescent Current (MAX748A)
1.4mA Quiescent Current (MAX763A)
♦ 0.2µA Shutdown Supply Current
♦ 22µH Preselected Inductor Value;
No Component Design Required
♦ Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
♦ Cycle-by-Cycle Current Limiting
♦ 8-Pin DIP/SO Packages (MAX763A)
_________________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX748ACPA 0°C to +70°C 8 Plastic DIP
MAX748ACWE 0°C to +70°C 16 Wide SO
MAX748AC/D 0°C to +70°C Dice*
MAX748AEPA -40°C to +85°C 8 Plastic DIP
MAX748AEWE -40°C to +85°C 16 Wide SO
MAX748AMJA -55°C to +125°C 8 CERDIP
MAX748A/MAX763A
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
_______________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
19-0190; Rev 0; 9/93
Ordering Information continued on last page.
* Contact factory for dice specifications.
____________________Pin Configurations
MAX748A
INPUT
3.3V TO 16V
V+
LX
OUT
CC
GNDSS
REF
SHDNON/OFF
22µH
OUTPUT
3.3V
100µF
____________Typical Operating Circuit
TOP VIEW
1
2
3
4
8
7
6
5
V+
LX
GND
OUT
CC
SS
REF
MAX748A
MAX763A
DIP
SHDN
Pin Configurations continued on last page.
MAX748A/MAX763A
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
2 ________________________________________________________________________________________________
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
(Circuit of Figure 3, V+ = 5V, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER CONDITIONS
MAX748A MAX763A
UNITS
MIN TYP MAX MIN TYP MAX
Input Voltage Range 3.3 16.0 3.3 11.0 V
C/E temp. ranges,
V+ = 4.0V to 16V, 3.135 3.3 3.465
0mA < I
LOAD
< 300mA
M temp. range,
V+ = 4.0V to 16V, 3.135 3.3 3.465
0mA < I
LOAD
< 250mA
C/E temp. ranges,
V+ = 4.75V to 16V, 3.135 3.3 3.465
0mA < I
LOAD
< 500mA
M temp. range,
V+ = 4.75V to 16V, 3.135 3.3 3.465
Output Voltage
0mA < I
LOAD
< 400mA
V
C/E temp. ranges,
V+ = 4.0V to 11V, 3.135 3.3 3.465
0mA < I
LOAD
< 300mA
M temp. range,
V+ = 4.0V to 11V, 3.135 3.3 3.465
0mA < I
LOAD
< 250mA
C/E temp. ranges,
V+ = 4.75V to 11V, 3.135 3.3 3.465
0mA < I
LOAD
< 500mA
M temp. range,
V+ = 4.75V to 11V, 3.135 3.3 3.465
0mA < I
LOAD
< 400mA
Line Regulation 0.13 0.13 %/V
Load Regulation I
LOAD
= 0mA to 500mA 0.001 0.001 %/mA
ABSOLUTE MAXIMUM RATINGS
Pin Voltages:
V+ (MAX748A)......................................................+17V, -0.3V
V+ (MAX763A)......................................................+12V, -0.3V
LX (MAX748A) .................................(V+ - 21V) to (V+ + 0.3V)
LX (MAX763A) .................................(V+ - 12V) to (V+ + 0.3V)
OUT.................................................................................±25V
SS, CC,
SHDN
..........................................-0.3V to (V+ + 0.3V)
Peak Switch Current (I
LX
).....................................................2.0A
Reference Current (I
REF
)...................................................2.5mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 6.90mW/°C above +70°C)...552mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)....762mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C).......640mW
Operating Temperature Ranges:
MAX7__AC__ ....................................................0°C to +70°C
MAX7__AE__ .................................................-40°C to +85°C
MAX7__AMJA__ ..........................................-55°C to +125°C
Junction Temperatures:
MAX7__AC/E ..............................................................+150°C
MAX7__AM.................................................................+175°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
MAX748A/MAX763A
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
_________________________________________________________________________________________________
3
Note 1: The standby current typically settles to 10µA (over temperature) within 2 seconds; however, to decrease test time, the part
is guaranteed at a 100µA maximum value.
MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
MAXIMUM OUTPUT CURRENT (mA)
0
200
400
600
800
1000
0246810121416
SUPPLY VOLTAGE (V)
MAX748A
MAX763A
NOTE 2
MAX763A
EFFICIENCY vs. OUTPUT CURRENT
EFFICIENCY (%)
60
65
70
75
80
85
90
95
100
0 100 200 300 400 500 600 700 800
OUTPUT CURRENT (mA)
V
IN
= 7.0V
V
IN
= 5.0V
V
IN
= 11.0V
NOTE 2
MAX748A
EFFICIENCY vs. OUTPUT CURRENT
EFFICIENCY (%)
OUTPUT CURRENT (mA)
60
65
70
75
80
85
90
95
100
0 100 200 300 400 500 600 700 800 900
V
IN
= 4.5V
V
IN
= 16V
V
IN
= 12V
V
IN
= 9V
V
IN
= 6V
NOTE 2
________________________________________________Typical Operating Characteristics
(Circuit of Figure 3, T
A
= +25°C, V
OUT
= 3.3V, unless otherwise noted.)
PARAMETER CONDITIONS
MAX748A MAX763A
UNITS
MIN TYP MAX MIN TYP MAX
Efficiency V+ = 5V
I
LOAD
= 300mA 88 88
%
I
LOAD
= 100mA 90 90
Supply Current Includes switch current 1.7 3.0 1.4 2.5 mA
Shutdown Current
SHDN
= 0V (Note 1) 0.2 100.0 0.2 100.0 µA
Shutdown Input
V
IH
2.0 2.0
V
Threshold
V
IL
0.25 0.25
Shutdown Input
1.0 1.0 µA
Leakage Current
Short-Circuit Current 1.2 1.2 A
Undervoltage Lockout V+ falling 2.7 3.0 2.7 3.0 V
LX On Resistance I
LX
= 500mA 1.0 1.0 Ω
LX Leakage Current V+ = 12V, LX = 0 10 10 nA
Reference Voltage T
A
= +25°C 1.15 1.22 1.30 1.15 1.22 1.30 V
Reference Drift T
A
= T
MIN
to T
MAX
50 50 ppm/°C
Oscillator Frequency 159 180 212.5 159 200 212.5 kHz
Compensation Pin
7500 7500 Ω
Impedance
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V+ = 5V, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
P1-P3P4-P6P7-P9P10-P12

MAX763ACSA+T

Mfr. #:
Buy MAX763ACSA+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 3.3V Step-Down DC/DC Converter
Lifecycle:
New from this manufacturer.
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