19-0195; Rev 0; 10/93
Ad ju s t a b le , S t e p -Do w n ,
Cu rre n t -Mo d e P WM Re g u la t o rs
0/MX758A
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Up to 750mA Load Currents
The MAX750A/MAX758A are adjustable-output, CMOS,
s te p -d own, DC-DC s witc hing re g ula tors . 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.
♦ 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
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.
♦ Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
♦ Cycle-by-Cycle Current Limiting
♦ 8-Pin DIP/SO Packages (MAX750A)
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX750ACPA
MAX750ACSA
MAX750AC/D
MAX750AEPA
MAX750AESA
MAX750AMJA
0°C to +70°C
0°C to +70°C
Dice*
________________________Ap p lic a t io n s
Cellular Phones & Radios
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
Portable Communications Equipment
Portable Instruments
8 CERDIP**
Ordering Information continued on last page.
* Contact factory for dice specifications.
Computer Peripherals
**Contact factory for availability and processing to MIL-STD-883.
__________Typ ic a l Op e ra t in g Circ u it
_________________P in Co n fig u ra t io n s
INPUT
TOP VIEW
4V TO 16V
OUTPUT ADJ.
FROM
VREF TO V+
SHDN
REF
SS
1
2
3
4
8
7
6
5
V+
LX
V+
33µH
MAX750A
MAX758A
LX
CC
GND
CC
I.C.
MAX750A
MAX758A
DIP
ON/OFF
SHDN
V+
1
2
3
4
8
7
6
5
SHDN
REF
LX
REF
SS
MAX750A
SS
GND
I.C.
GND
CC
SO
Pin Configurations continued on last page.
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .