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L6902 Datasheet(PDF) 1 Page - STMicroelectronics |
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L6902 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 11 page November 2010 Doc ID 7332 Rev 9 1/11 11 L6902 Up to 1 A switching regulator with adjustable current limit Features ■ Up to 1 A output current ■ Operating input voltage from 8 V to 36 V ■ Precise 3.3 V (±2%) reference voltage ■ 5 % output current accuracy ■ Output voltage adjustable from 1.235 V to 34 V ■ 250 kHz internally fixed frequency ■ Voltage feedforward ■ Zero load current operation ■ Adjustable current limit ■ Protection against feedback Disconnection ■ Thermal shutdown Applications ■ Chargers for NiCd, NiMH batteries and preregulator for lithium-ion batteries ■ Adjustable current generator ■ Simple step-down converters with adjustable current limit ■ Battery equipped systems ■ Distributed power supply ■ Mobile PC and subnotebook Description 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 m Ω assures high efficiency and a minimum dropout even at high output current level. The internal limiting current (latched function) of typical value of 2.5 A protects the device from accidental output short circuit avoiding dangerous loads damage. If the temperature of the chip goes higher than a fixed internal threshold (150°C with 20°C hysteresis), the power stage is turned off. Other protections beside thermal shutdown complete the device for a safe and reliable application: overvoltage protection, frequency folback overcurrent protection and protection vs. feedback disconnection. The internal fixed switching frequency of 250KHz, and the SO-8 package pin allow to built an ultra compact DC/ DC converter with a minimum board space. Table 1. Device summary Order codes Package Packaging L6902D SO-8 Tube L6902D013TR Tape and reel SO-8 www.st.com |
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