The LP38858 is a high current, fast response regulator which can maintain output voltage regulation with extremely low input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides voltage to drive the gate of the N-MOS power transistor, while VIN is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low VIN voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.
The fast transient response of this device makes it suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The LP38858 is available in TO-220 and DDPAK/TO-263 5-Lead packages.
Dropout Voltage: 130mV (typical) at 1.5A load current.
Low Ground Pin Current: 10 mA (typical) at 1.5A load current.
Soft-Start: Programmable Soft-Start time.
Precision Output Voltage: ±1.0% for TJ = 25°C and ±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions
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| Output options | Fixed Output |
| Iout (max) (A) | 1.5 |
| Vin (max) (V) | 5.5 |
| Vin (min) (V) | 0.98 |
| Vout (max) (V) | 1.2 |
| Vout (min) (V) | 1.2 |
| Fixed output options (V) | 1.2 |
| Noise (µVrms) | 150 |
| Iq (typ) (mA) | 10 |
| Thermal resistance θJA (°C/W) | 60 |
| Rating | Catalog |
| Load capacitance (min) (µF) | 10 |
| Regulated outputs (#) | 1 |
| Features | Soft start |
| Accuracy (%) | 1 |
| PSRR at 100 KHz (dB) | 37 |
| Dropout voltage (Vdo) (typ) (mV) | 180 |
| Operating temperature range (°C) | -40 to 125 |
| TO-220 (NDH) | 5 | 86.0552 mm² 10.16 x 8.47 |
| TO-263 (KTT) | 5 | 154.8384 mm² 10.16 x 15.24 |
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