MIC5156/5157/5158 are super low-dropout (LDO) regulator controllers produced by Micrel. The MIC5156 can be configured as a fixed 5V controller or programmed to any voltage from 1.3V to 36V using two external resistors. The MIC5157 and MIC5158 operate in a temperature range of -40°C to +85°C.
The MIC5156, MIC5157, and MIC5158 are Super Low‑Dropout (LDO) regulator controllers that use an external N‑channel MOSFET as the pass element. They operate from 3 V to 36 V and offer fixed or programmable output voltages with optional current‑limit functionality.
The manual includes detailed pin configurations, electrical characteristics, typical performance graphs, and application notes such as MOSFET selection, circuit layout, current‑limiting design, and examples for battery chargers, UPS supplies, and high‑current switching.
| Operating voltage range | 3 V to 36 V |
|---|---|
| Typical operating current | 4.5 mA |
| Typical standby current | <1 µA |
| Current‑limit threshold | 35 mV across sense resistor |
They operate from 3 V to 36 V.
Applying a TTL low to the EN pin places the controller in shutdown mode, reducing supply current to less than 1 µA.
The typical operating current is 4.5 mA.
Current limiting engages when the voltage across the external sense resistor reaches 35 mV.