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MAX758ACWE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
_______________General Description
The MAX750A/MAX758A are adjustable-output, CMOS,
step-down, DC-DC switching regulators. The
MAX758A accepts inputs from 4V to 16V and delivers
750mA, while the MAX750A accepts inputs from 4V to
11V and delivers 450mA. Typical efficiencies are 85%
to 90%. Typical quiescent current is 1.7mA, or only
6µA in shutdown mode. The output does not exhibit
any ripple at subharmonics of the switching frequency
over its specified range.
Pulse-width-modulation (PWM) current-mode control
provides precise output regulation and excellent tran-
sient responses. Output voltage accuracy is guaran-
teed to be ±4.5% plus feedback-resistor tolerance over
line, load, and temperature variations. Fixed-frequency
switching and absence of subharmonic ripple 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.
________________________Applications
Cellular Phones & Radios
Portable Communications Equipment
Portable Instruments
Computer Peripherals
____________________________Features
♦ Up to 750mA Load Currents
♦ 160kHz High-Frequency, Current-Mode PWM
♦ 85% to 96% Efficiencies
♦ 33µH or 100µH Pre-Selected Inductor Value,
No Component Design Required
♦ 1.7mA Quiescent Supply Current
♦ 6µA Shutdown Supply Current
♦ Adjustable Output Voltage
♦ Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
♦ Cycle-by-Cycle Current Limiting
♦ 8-Pin DIP/SO Packages (MAX750A)
______________Ordering Information
Ordering Information continued on last page.
* Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
MAX750A/MAX758A
Adjustable, Step-Down,
Current-Mode PWM Regulators
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
V+
LX
GND
I.C.
CC
SS
REF
SHDN
DIP
TOP VIEW
MAX750A
MAX758A
1
2
3
4
8
7
6
5
V+
LX
GND
I.C.
CC
SS
REF
MAX750A
SO
SHDN
_________________Pin Configurations
OUTPUT ADJ.
FROM
VREF TO V+
INPUT
4V TO 16V
LX
CC
GND
SS
MAX750A
MAX758A
SHDN
V+
REF
33µH
ON/OFF
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0195; Rev 0; 10/93
PART TEMP. RANGE PIN-PACKAGE
MAX750ACPA
0°C to +70°C 8 Plastic DIP
MAX750ACSA 0°C to +70°C 8 SO
MAX750AC/D 0°C to +70°C Dice*
MAX750AMJA -55°C to +125°C 8 CERDIP**
MAX750AESA -40°C to +85°C 8 SO
MAX750AEPA -40°C to +85°C 8 Plastic DIP
Pin Configurations continued on last page.
MAX750A/MAX758A
Adjustable, Step-Down,
Current-Mode PWM Regulators
2 _______________________________________________________________________________________
Pin Voltages
V+ (MAX750A).........................................................+12V, -0.3V
V+ (MAX758A).........................................................+18V, -0.3V
LX (MAX750A)....................................(V+ - 12V) to (V+ + 0.3V)
LX (MAX758A)....................................(V+ - 21V) to (V+ + 0.3V)
SS, CC, SHDN.............................................-0.3V to (V+ + 0.3V)
Peak Switch Current (I
LX
).........................................................2A
Reference Current (I
REF
) ...................................................2.5mA
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:
MAX75_AC_ _.......................................................0°C to +70°C
MAX75_AE_ _ ....................................................-40°C to +85°C
MAX75_AMJA..................................................-55°C to +125°C
Junction Temperatures:
MAX75_AC_ _/AE_ _......................................................+150°C
MAX75_AMJA................................................................+175°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V+ = 9V for the MAX750A, V+ = 12V for the MAX758A, V
OUT
= 5V, R2 = 40.20kΩ, R3 = 13.0kΩ, 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 UNITS
Load Regulation
0.0005
%/VLine Regulation
0.15
Input Voltage Range 4.0 11.0 V
%/mA
Efficiency
92
%
Supply Current 1.7 3.0 mA
4.75 5.00 5.25
Output Voltage
(Note 1)
V
6.0 100.0 µA
2.0
Shutdown Input
Threshold
0.25
V
1.0 µA
Short-Circuit Current 1.5 A
CONDITIONS
SHDN = 0V
I
LOAD
= 0mA to 450mA
V
IH
V+ = 4.0V to 16.0V
V+ = 4.0V to 11.0V
I
LOAD
= 0mA to 750mA
V+ = 9.0V, I
LOAD
= 300mA
V
IL
V+ = 12V, I
LOAD
= 750mA
ABSOLUTE MAXIMUM RATINGS
V+ = 6.0V to 11.0V;
0mA < I
LOAD
< 450mA for MAX750AC,
0mA < I
LOAD
< 450mA for MAX750AE,
0mA < I
LOAD
< 300mA for MAX750AM
V+ = 6.0V to 16.0V;
0mA < I
LOAD
< 450mA for MAX758AC/AE,
0mA < I
LOAD
< 350mA for MAX758AM
V+ = 10.2V to 16.0V,
0mA < I
LOAD
< 750mA
Shutdown Supply
Current (Note 2)
Shutdown Input
Leakage Current
MAX750A
MIN TYP MAX
MAX758A
MIN TYP MAX
6.0 100.0
2.0
0.15
4.0 16.0
0.0005
90
0.25
87
1.0
1.7 3.0
1.5
4.75 5.00 5.25
4.75 5.00 5.25
MAX750A/MAX758A
Adjustable, Step-Down,
Current-Mode PWM Regulators
_______________________________________________________________________________________ 3
Note 1: Output voltage tolerance over temperature is ±4.5% plus the tolerances of R3 and R4 in Figure 3.
Note 2: 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.
PARAMETER
MAX758A
MIN TYP MAX
MAX750A
MIN TYP MAX
UNITS
3.75 4.00
3.5
0.5
1.0
1.15 1.22 1.30
50
130 160 190
7500
3.75 4.00
Undervoltage
Lockout
3.5
V
LX On Resistance 0.5 Ω
LX Leakage Current 1.0 µA
Reference Voltage 1.15 1.22 1.30 V
Reference Drift 50 ppm/°C
Oscillator Frequency kHz
Compensation Pin
Impedance
7500 Ω
CONDITIONS
V+ rising
V+ falling
I
LX
= 500mA
T
A
= +25°C
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V+ = 9V for the MAX750A, V+ = 12V for the MAX758A, V
OUT
= 5V, R2 = 40.20kΩ, R3 = 13.0kΩ, I
LOAD
= 0mA,
T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
__________________________________________Typical Operating Characteristics
(Circuit of Figure 3, V
OUT
= 5V, T
A
= +25°C, unless otherwise noted.)
100
60
0 600
MAX750A
EFFICIENCY vs. OUTPUT CURRENT
70
MAX750A/58A-1
OUTPUT CURRENT (mA)
EFFICIENCY (%)
200 400
90
80
800 1000
V+ = 5.5V
V+ = 7V
V+ = 9V
V+ = 11V
(NOTES 3, 6)
100
60
0 600
MAX758A
EFFICIENCY vs. OUTPUT CURRENT
70
MAX750A/58A-2
OUTPUT CURRENT (mA)
EFFICIENCY (%)
200 400
90
80
800 1000
V+ = 6V
V+ = 8V
V+ = 12V
V+ = 16V
(NOTES 3, 6)
130 170 210
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX758ACWE+T

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Buy MAX758ACWE+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators Adjustable PWM Step-Down Regulator
Lifecycle:
New from this manufacturer.
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