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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.主な特徴
- 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
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画像 製品型番 製造元 概要 
STEVAL-ISA155V1 -- 1 A constant current DC/DC converter evaluation board based on the L6902D 製品型番1 A constant current DC/DC converter evaluation board based on the L6902D
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| 製品型番 | 製品ステータス | パッケージ | グレード | RoHSコンプライアンスグレード | 材料宣誓書** |
|---|---|---|---|---|---|
| L6902D | 量産中 | SO-8 | Industrial | Ecopack2 (**) | |
| L6902D013TR | 量産中 | SO-8 | Industrial | Ecopack2 (**) | |
L6902D
Package:
SO-8Material Declaration**:
L6902D013TR
Package:
SO-8Material Declaration**:
(**) st.comで提供している材料宣誓書は、パッケージ･ファミリ内で最も一般的に使用されているパッケージに基づく汎用ドキュメントの場合があります。そのため、特定の製品では100%正確ではない可能性があります。特定の製品情報については、セールスサポートまでお問い合わせください
