L6902

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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: Up to 1 A switching regulator with adjustable current limit	9.0	197 KB

Application Notes

	Description	Version	Size
	AN2129: Dimming of super high brightness LEDs with L6902D	2.3	357 KB
	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
	Electric vehicle (EV) ecosystem	1.1	1 MB

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Sample & Buy

Part Number	Package	Packing Type	Marketing Status	Unit Price (US$) *	Quantity	ECCN (US)	Country of Origin	More info	Order from ST	Order from Distributors
L6902D	SO-8	Tube	Active : Product is in volume production	1.145	1000	EAR99	CHINA	MORE INFO	Buy Direct Add to cart	DISTRIBUTOR AVAILABILITY
L6902D013TR	SO-8	Tape And Reel	Active : Product is in volume production	1.145	1000	EAR99	CHINA	MORE INFO	Buy Direct Add to cart	DISTRIBUTOR AVAILABILITY

(*) 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	Active	SO-8	Industrial	Ecopack2 (**)
L6902D013TR	Active	SO-8	Industrial	Ecopack2 (**)

(**) 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.