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Description
The RH5RH××1A/××2B/××3B series is a group of pulse width modulation (PWM) step-up DC/DC converter integrated circuits (ICs) made by CMOS process. These ICs have an oscillator, a PWM control circuit, a driver transistor (Lx switch), a reference voltage unit, an error amplifier, a phase compensation circuit, resistors for voltage detection, a soft-start circuit, and an Lx switch protection circuit. With the help of only three external components, an inductor, a diode, and a capacitor, these ICs can construct an efficient step-up DC/DC converter with negligible ripple. Its supply current is ultra-low, no load, with TYP. 15µA, as the IC uses a newly developed PWM control circuit, equivalent to the low supply current of a VFM (chopper) Step-up DC/DC converter.
Specifications and Features
- Small number of external components with only an inductor, a diode, and a capacitor (RH5RH××1A)
- Low supply current - TYP. 15µA (RH5RH301A)
- Low ripple and low noise
- Low start-up voltage (when the output current is 1mA) - MAX. 0.9V
- High output voltage accuracy - ±2.5%
- High efficiency - TYP. 85%
- Low temperature-drift coefficient of output voltage - TYP. ±50 ppm/˚C
- Soft-start - MIN. 500µs
- Small packages - SOT-89 (RH5RH××1A, RH5RH××2B), SOT-89-5 (RH5RH××3B)
Application Scenarios
The RH5RH××1A/××2B/××3B series ICs are extremely useful in scenarios where high efficiency and negligible ripple are desired. These are typically used in DC/DC converter modules in products such as data centers, servers, and portable electronics such as tablets and smartphones.
Comparison
Advantages- High-efficiency coupled with negligible ripple.
- Low supply voltage and low noise.
- Low supply current - TYP 15 µA is ultra-low when compared to other ICs.
- Wide operating voltage range.
- Small number of external devices.
- Small packaging for use in products with space constraints.
Disadvantages- Though RH5RH××1A IC consists of only three components, an inductor, a diode, and a capacitor, some of the other ICs in the RH5RH××2B/××3B series may require additional components, increasing complexity.
- May not be suitable to use in applications where high output current is required.
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Similar parts: 430483 , Click to view
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Datasheet
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- Last Updated: 2024/06/30 20:31 +0800
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