The L6902D is a complete and simple step down switching regulator with adjustable current limit. Based on a voltage mode structure it integrates a current error amplifier to have a constant voltage and constant current control. By means of an on board current sense resistor and the availability of the current sense pins (both compatible to Vcc and for Cs- compatible with GND too) a current limit programming is very simple and accurate (±5%). Moreover constant current control can be used to charge NiMH and NiCd batteries. The device can be used as a standard DC/DC converter with adjustable current limit (set by using the external sense resistor). The internal robust P-channel DMOS transistor with a typical of 250 mΩ assures high efficiency.
The L6902 is a complete and simple step-down switching regulator with an adjustable current limit, designed for applications such as battery chargers for NiCd and NiMH batteries, preregulators for lithium-ion batteries, and distributed power supplies. It features a voltage mode structure with an integrated current error amplifier for constant voltage and constant current control.
| Output current | Up to 1 A |
|---|---|
| Input voltage range | 8 V to 36 V |
| Reference voltage | 3.3 V (±2%) |
| Output voltage range | 1.235 V to 34 V |
| Switching frequency | 250 kHz |
| Maximum limiting current | 2.5 A |
| Thermal shutdown threshold | 150°C |
| Package | SO-8 |
The internal fixed switching frequency is 250 kHz.
The device supports up to 1 A output current.
The typical dropout voltage is 0.5 V when VCC is 8V and IO is 1A.
The device provides a precise 3.3 V reference voltage with ±2% accuracy.