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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX738A Datasheet

Current-Mode PWM DC-DC Converters

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19-0165; Rev 2; 1/96
5V, Step-Down,
Current-Mode PWM DC-DC Converters
__________________General Description
The MAX730A/MAX738A/MAX744A are 5V-output
CMOS, step-down switching regulators. The MAX738A/
MAX744A accept inputs from 6V to 16V and deliver
750mA. The MAX744A guarantees 500mA load capa-
bility for inputs above 6V and has tighter oscillator fre-
quency limits for low-noise (radio) applications. The
MAX730A accepts inputs between 5.2V and 11V and
delivers 450mA for inputs above 6V. Typical efficien-
cies are 85% to 96%. Quiescent supply current is
1.7mA and only 6µA in shutdown.
Pulse-width modulation (PWM) current-mode control
provides precise output regulation and excellent tran-
sient responses. Output voltage accuracy is guaran-
teed to be ±5% over line, load, and temperature varia-
tions. Fixed-frequency switching allows easy filtering of
output ripple and noise, as well as the use of small
external components. These regulators require only a
single inductor value to work in most applications, so
no inductor design is necessary.
The MAX730A/MAX738A/MAX744A also feature cycle-
by-cycle current limiting, overcurrent limiting, undervolt-
age lockout, and programmable soft-start protection.
___________________________Applications
Portable Instruments
Cellular Phones and Radios
Personal Communicators
Distributed Power Systems
Computer Peripherals
__________Typical Operating Circuit
________________________________Features
o 750mA Load Currents (MAX738A/MAX744A)
o High-Frequency, Current-Mode PWM
o 159kHz to 212.5kHz Guaranteed Oscillator
Frequency Limits (MAX744A)
o 85% to 96% Efficiencies
o 1.7mA Quiescent Current
o 6µA Shutdown Supply Current
o Single Preselected Inductor Value,
No Component Design Required
o Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
o Cycle-by-Cycle Current Limiting
o 8-Pin DIP/SO Packages (MAX730A)
_________________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX730ACPA
0°C to +70°C
8 Plastic DIP
MAX730ACSA
0°C to +70°C
8 SO
MAX730AC/D
0°C to +70°C
Dice*
MAX730AEPA -40°C to +85°C
8 Plastic DIP
MAX730AESA -40°C to +85°C
8 SO
MAX730AMJA -55°C to +125°C 8 CERDIP
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
_________________Pin Configurations
INPUT
6V TO 16V
68µF
V+
LX
ON/OFF
MAX738A
MAX744A
SHDN
OUT
REF
SS
CC
GND
33µH
OUTPUT
5V
100µF
TOP VIEW
SHDN 1
REF 2
SS 3
CC 4
MAX730A
MAX738A
MAX744A
DIP
8 V+
7 LX
6 GND
5 OUT
Pin Configurations continued on last page.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX738A Datasheet

Current-Mode PWM DC-DC Converters

No Preview Available !

5V, Step-Down,
Current-Mode PWM DC-DC Converters
ABSOLUTE MAXIMUM RATINGS
Pin Voltages
V+ (MAX730A) ......................................................+12V, -0.3V
V+ (MAX738A/MAX744A) .....................................+18V, -0.3V
LX (MAX730A) .................................(V+ - 12V) to (V+ + 0.3V)
LX (MAX738A/MAX744A) ................(V+ - 21V) to (V+ + 0.3V)
OUT .................................................................................±25V
SS, CC, SHDN .........................................-0.3V to (V+ + 0.3V)
Peak Switch Current (ILX) ........................................................2A
Reference Current (IREF) ...................................................2.5mA
Continuous Power Dissipation (TA = +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW
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_ _/AE_ _...................................................+150°C
MAX7_ _AMJA.............................................................+175°C
Storage Temperature Range ............................-65°C to +160°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
(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/MAX744A, ILOAD = 0mA, TA = TMIN to TMAX,
unless otherwise noted.)
PARAMETER
Output Voltage
CONDITIONS
0mA < ILOAD < 450mA,
MAX730AC
V+ = 6.0V 0mA < ILOAD < 450mA,
to 11.0V MAX730AE
0mA < ILOAD < 300mA,
MAX730AM
0mA < ILOAD < 450mA,
MAX738AC/AE
V+ = 6.0V
to 16.0V
0mA < ILOAD < 350mA,
MAX738AM
0mA < ILOAD < 500mA,
MAX744AC/AE
0mA < ILOAD < 375mA,
MAX744AM
V+ = 10.2V to 16.0V,
0mA < ILOAD < 750mA
MAX730A
MIN TYP MAX
4.75 5.00 5.25
MAX738A
MIN TYP MAX
4.75 5.00 5.25
4.75 5.00 5.25
MAX744A
MIN TYP MAX
UNITS
4.75 5.00 5.25
V
V+ = 9.0V
to 16.0V
0mA < ILOAD < 750mA,
MAX744AC/AE
0mA < ILOAD < 600mA,
MAX744AM
4.75 5.00 5.25
Input Voltage
Range
Line Regulation
V+ = 5.2V to 11.0V
V+ = 6.0V to 16.0V
5.2 11.0
0.15
6.0 16.0
0.15
6.0 16.0
0.15
V
%/V
2 _______________________________________________________________________________________


Part Number MAX738A
Description Current-Mode PWM DC-DC Converters
Maker Maxim Integrated
Total Page 16 Pages
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