MAX758A

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)


Application

Cellular Phones & Radios
Portable Communications Equipment
Portable Instruments
Computer Peripherals


Pinout




Specifications

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 (ILX)...........................................................2A
Reference Current (IREF) ......................................................2.5mA
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:
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


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.  Ty-pical efficiencies are 85% to 90%.  Typical quiescent current of MAX758A 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-widthmodulation (PWM) current-mode control provides precise output regulation and excellent transient res-ponses.  Output voltage accuracy is guaranteed 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 MAX758A require only a single inductor value to work in most applications, so no inductor design is necessary.