MAX750A Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Adjustable, Step-Down, Current-Mode PWM Regulators

19-0195; Rev 0; 10/93
Adjustable, Step-Down,
Current-Mode PWM Regulators
_______________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
o Up to 750mA Load Currents
o 160kHz High-Frequency, Current-Mode PWM
o 85% to 96% Efficiencies
o 33µH or 100µH Pre-Selected Inductor Value,
No Component Design Required
o 1.7mA Quiescent Supply Current
o 6µA Shutdown Supply Current
o Adjustable Output Voltage
o Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
o Cycle-by-Cycle Current Limiting
o 8-Pin DIP/SO Packages (MAX750A)
______________Ordering Information
PART
MAX750ACPA
MAX750ACSA
MAX750AC/D
MAX750AEPA
MAX750AESA
MAX750AMJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
Ordering Information continued on last page.
* Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations __________Typical Operating Circuit
TOP VIEW
SHDN ₁
REF 2
SS 3
CC 4
MAX750A
MAX758A
DIP
8 V+
7 LX
6 GND
5 I.C.
SHDN 1
REF 2
SS 3
CC 4
MAX750A
SO
8 V+
7 LX
6 GND
5 I.C.
Pin Configurations continued on last page.
INPUT
4V TO 16V
V+
LX
ON/OFF
MAX750A
MAX758A
SHDN
CC
REF
SS
GND
OUTPUT ADJ.
FROM
33µH
VREF TO V+
________________________________________________________________ Maxim Integrated Products 1
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