Key facts
- Brand
- Maxim
- Model
- MAX744A
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-04-05
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Maxim MAX730A/MAX738A/MAX744A Step-Down Switching Regulator Datasheet
The MAX730A, MAX738A, and MAX744A are 5 V output CMOS step‑down switching regulators. They accept input voltages from 5.2 V‑11 V (MAX730A) or 6 V‑16 V (MAX738A/MAX744A) and deliver up to 750 mA of regulated output. Typical efficiencies range from 85 % to 96 % with low quiescent current (1.7 mA, 6 µA in shutdown). These devices are suited for portable instruments, cellular phones, radios, personal communicators, distributed power systems, and computer peripherals.
Key features include cycle‑by‑cycle current limiting, over‑current protection, undervoltage lockout, programmable soft‑start, and a fixed‑frequency PWM architecture that simplifies external component selection. The datasheet provides absolute maximum ratings, detailed electrical characteristics, pin configurations for multiple package types, and typical operating curves for efficiency, oscillator frequency, and transient response.
Maxim MAX744A specifications
| Maximum output current (MAX738A/MAX744A) | 750 mA |
|---|---|
| Maximum output current (MAX730A) | 450 mA |
| Input voltage range (MAX730A) | 5.2 V – 11 V |
| Input voltage range (MAX738A/MAX744A) | 6 V – 16 V |
| Efficiency | 85 % – 96 % |
| Quiescent supply current | 1.7 mA (active), 6 µA (shutdown) |
| Oscillator frequency (MAX744A) | 159 kHz – 212.5 kHz |
| Package options | 8‑Pin DIP, 8‑Pin SO, 16‑Pin Wide SO, 8‑Pin CERDIP |
| Protection features | Cycle‑by‑cycle current limiting, over‑current limiting, undervoltage lockout, programmable soft‑start |
Source: Maxim MAX730A/MAX738A/MAX744A Step-Down Switching Regulator Datasheet
All Maxim MAX744A documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What input voltage range does the MAX730A support?
The MAX730A operates with input voltages from 5.2 V to 11 V.
From: Maxim MAX730A/MAX738A/MAX744A Step-Down Switching Regulator Datasheet
How much quiescent current is drawn in shutdown mode?
In shutdown mode the device draws about 6 µA.
From: Maxim MAX730A/MAX738A/MAX744A Step-Down Switching Regulator Datasheet
What input voltage range does the MAX738A support?
The MAX738A accepts input voltages from 6 V to 16 V.
From: Maxim MAX730A/MAX738A/MAX744A 5V Step-Down PWM DC-DC Converter Datasheet
What is the shutdown supply current of these converters?
In shutdown mode the supply current is only 6 µA.
From: Maxim MAX730A/MAX738A/MAX744A 5V Step-Down PWM DC-DC Converter Datasheet