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 efficien- cies 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 tran- sient responses. Output voltage accuracy is guaran- teed to be ±5% over line, load, and temperature varia- tions. 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, undervolt- age lockout, and programmable soft-start protection.
The MAX730A/MAX738A/MAX744A series are 5 V‑output CMOS step‑down switching regulators. They use current‑mode PWM control and require only a single inductor, simplifying design. The devices operate from 5.2 V to 16 V input and deliver up to 750 mA output with efficiencies of 85 %–96 %.
These converters are suited for portable instruments, cellular phones, radios, distributed power systems, and computer peripherals. Features include cycle‑by‑cycle current limiting, over‑current and undervoltage lockout, programmable soft‑start, and low quiescent current (1.7 mA normal, 6 µA shutdown).
| Input Voltage Range (MAX738A/MAX744A) | 6 V to 16 V |
|---|---|
| Input Voltage Range (MAX730A) | 5.2 V to 11 V |
| Maximum Output Current | 750 mA |
| Typical Efficiency | 85 % to 96 % |
| Quiescent Supply Current (normal operation) | 1.7 mA |
| Shutdown Supply Current | 6 µA |
| Oscillator Frequency (MAX744A) | 159 kHz to 212.5 kHz |
| Package Types | 8‑Pin DIP, 8‑Pin SO, 16‑Pin Wide SO, 8‑Pin CERDIP |
The MAX738A accepts input voltages from 6 V to 16 V.
In shutdown mode the supply current is only 6 µA.
They provide typical efficiencies between 85 % and 96 %.
The MAX744A guarantees an oscillator frequency from 159 kHz up to 212.5 kHz.