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MAX738AEWE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
__________________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
________________________________Features
♦ 750mA Load Currents (MAX738A/MAX744A)
♦ High-Frequency, Current-Mode PWM
♦ 159kHz to 212.5kHz Guaranteed Oscillator
Frequency Limits (MAX744A)
♦ 85% to 96% Efficiencies
♦ 1.7mA Quiescent Current
♦ 6µA Shutdown Supply Current
♦ Single Preselected Inductor Value,
No Component Design Required
♦ Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
♦ Cycle-by-Cycle Current Limiting
♦ 8-Pin DIP/SO Packages (MAX730A)
_________________Ordering Information
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
________________________________________________________________
Maxim Integrated Products
1
TOP VIEW
1
2
3
4
8
7
6
5
V+
LX
GND
OUT
CC
SS
REF
MAX730A
MAX738A
MAX744A
DIP
SHDN
Pin Configurations continued on last page.
_________________Pin Configurations
MAX738A
MAX744A
INPUT
6V TO 16V
V+
LX
OUT
CC
GNDSS
REF
SHDNON/OFF
33µH
OUTPUT
5V
100µF
68µF
__________Typical Operating Circuit
19-0165; Rev 2; 1/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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 8 Plastic DIP
MAX730AESA -40°C to +85°C 8 SO
-40°C to +85°C
MAX730AMJA -55°C to +125°C 8 CERDIP
MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/MAX744A, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
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.
PARAMETER
MAX730A
MIN TYP MAX
UNITS
4.75 5.00 5.25
CONDITIONS
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 (I
LX
)........................................................2A
Reference Current (I
REF
) ...................................................2.5mA
Continuous Power Dissipation (T
A
= +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
0mA < I
LOAD
< 450mA,
MAX730AC
0mA < I
LOAD
< 450mA,
MAX730AE
0mA < I
LOAD
< 300mA,
MAX730AM
0mA < I
LOAD
< 450mA,
MAX738AC/AE
0mA < I
LOAD
< 350mA,
MAX738AM
0mA < I
LOAD
< 500mA,
MAX744AC/AE
0mA < I
LOAD
< 375mA,
MAX744AM
MAX738A
MIN TYP MAX
4.75 5.00 5.25
4.75 5.00 5.25
MAX744A
MIN TYP MAX
4.75 5.00 5.25
4.75 5.00 5.25
Output Voltage V
V+ = 9.0V
to 16.0V
6.0 16.0 6.0 16.05.2 11.0 V
V+ = 5.2V to 11.0V 0.15
V+ = 6.0V to 16.0V 0.15 0.15
%/V
Line Regulation
V+ = 6.0V
to 16.0V
V+ = 6.0V
to 11.0V
V+ = 10.2V to 16.0V,
0mA < I
LOAD
< 750mA
0mA < I
LOAD
< 750mA,
MAX744AC/AE
0mA < I
LOAD
< 600mA,
MAX744AM
Input Voltage
Range
MAX730A/MAX738A/MAX744A
5V, Step-Down,
Current-Mode PWM DC-DC Converters
_______________________________________________________________________________________ 3
Note 1: The standby current typically settles to 25µA (over temperature) within 2 seconds; however, to decrease test time, the part
is guaranteed at a 100µA maximum value.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/MAX744A, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
PARAMETER
I
LOAD
= 0mA to 300mA
MAX730A
MIN TYP MAX
Supply Current
(includes switch
current)
I
LOAD
= 0mA to 750mA
UNITS
V+ = 9.0V, I
LOAD
= 300mA
MAX738A
MIN TYP MAX
4.3
mA
MAX744AE
I
LX
= 500mA
6.0 100.0 6.0 100.06.0 100.0 µAStandby Current
V
IH
0.0005
LX On Resistance
2.0 2.02.0
MAX744AC/AE
0.5
V
IL
MAX744A
MIN TYP MAX
0.25 0.250.25
V
0.5
0.0005
Shutdown Input
Threshold
%/mA
Shutdown Input
Leakage Current
V+ = 12V, I
LOAD
= 750mA
Load Regulation
0.0005
SHDN = 0V (Note 1)
0.5
1.7 3.0 1.7 3.01.7 3.0
159.0 185.0 212.5
Ω
MAX744AC/AE 1.2 2.5
V+ = 12V, LX = 0V
MAX744AM
1.0
3.0
1.0 1.0
V+ = 6.0V
to 9.0V
MAX744AC/AE 3.0
1.0 µA
Reference Drift
1.01.0
MAX744AM
µA
3.5
1.5
MAX744AM
V+ = 9.0V
to 12.0V
MAX744AC 4.0
50 50
LX Leakage Current
1.5
87
1.5
CONDITIONS
AShort-Circuit Current
V+ rising
159.0 216.5
5.7 6.0 5.7 6.04.7 5.2
V+ falling 5.0 5.7
V
kHz
Undervoltage
Lockout
90
87
90
%Efficiency
92
V+ = 6.0V
to 16.0V
V+ = 12V, T
A
= +25°CReference Voltage 1.15 1.23 1.30 1.15 1.23 1.301.15 1.23 1.30 V
50
130 160 190130 170 210
ppm/°C
Oscillator Frequency
7500 75007500 Ω
Compensation Pin
Impedance
4.5
V+ = 12.0V
to 16.0V
MAX744AM
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX738AEWE+T

Mfr. #:
Buy MAX738AEWE+T
Manufacturer:
Maxim Integrated
Description:
Voltage Regulators - Switching Regulators 5V Step-Down DC/DC Converte
Lifecycle:
New from this manufacturer.
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