1 A switching regulator with adjustable current limit

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 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.

Key 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

Circuit Diagram

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Resources

Technical Documentation

Product Specifications
Description Version Size
DS2033 DS2033: Up to 1 A switching regulator with adjustable current limit 9.0 197 KB
Application Notes
Description Version Size
AN2129 AN2129: Dimming of super high brightness LEDs with L6902D 2.3 357 KB
AN1941 AN1941: Low Voltage LED Driver Using L6920D, L4971 and L6902D 1.5 499 KB

Publications and Collaterals

Brochures
Description Version Size
Brochure Power management guide 09.2017 3 MB
eDesignSuite Support & Community


Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
L6902D SO-8 Tube Active 1.145 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
L6902D013TR SO-8 Tape And Reel Active 1.145 1000 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L6902D ActiveSO-8IndustrialEcopack2 (**) 0 0
L6902D013TR ActiveSO-8IndustrialEcopack2 (**) 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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