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MAX730A, MAX738A, MAX744A
5V, Step-Down, Current-Mode PWM DC-DC Converters
We Recommend Improved Performance Devices, MAX1684/MAX1685, for New Designs
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Status
Active: In Production.
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 capability for inputs above 6V and has tighter oscillator frequency limits for low-noise (radio) applications. The MAX730A accepts inputs between 5.2V and 11V and delivers 450mA for inputs above 6V. Typical efficiencies 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 transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. 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, undervoltage lockout, and programmable soft-start protection.
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Data Sheet
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Key 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)
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Applications/Uses
- Cell Phones
- Computer Peripherals
- Distributed Power Systems
- Personal Communicators
- Portable Instrumentation
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Key Specifications:
| Step-Down Switching Regulators |
| Part Number |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Preset VOUT
(V) |
Max. IOUT
(A) |
Output Adjust. Method |
DC-DC Outputs |
Oper. Freq.
(kHz) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≤ |
max w/pins |
See Notes |
| MAX730A |
5.2 |
11 |
5 |
5 |
5 |
0.45 |
|
1 |
210 |
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30.9 |
$2.26 @1k |
| MAX738A |
6 |
16 |
0.75 |
190 |
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81.9 |
$2.75 @1k |
| MAX744A |
6 |
16 |
0.75 |
212.5 |
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81.9 |
$3.06 @1k |
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See All Step-Down Switching Regulators (288)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
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Information Index
Document Ref.: 19-0165
Rev 2;
1996-01-01
This page last modified: 2007-05-30
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