ホーム パワー・マネージメント リニア・レギュレータと低ドロップアウト (LDO) レギュレータ

0℃ ~ 70℃、500mA、負電圧、調整可能な低ドロップアウト電圧レギュレータ

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比較対象デバイスと類似の機能
TPS7A33 アクティブ イネーブル搭載、1A、高 PSRR、負電圧、調整可能な低ドロップアウト電圧レギュレータ Alternative product with ultra-low-noise performance, higher accuracy and lower dropout voltage

製品詳細

Output options Adjustable Output, Fixed Output Iout (max) (A) 0.5 Vin (max) (V) -3.2 Vin (min) (V) -15 Vout (max) (V) -1.2 Vout (min) (V) -15 Fixed output options (V) -12, -5 Noise (µVrms) 200 Iq (typ) (mA) 0.2 Thermal resistance θJA (°C/W) 70 Rating Catalog Load capacitance (min) (µF) 4.7 Regulated outputs (#) 1 Accuracy (%) 2.5 Dropout voltage (Vdo) (typ) (mV) 250 Operating temperature range (°C) 0 to 70
Output options Adjustable Output, Fixed Output Iout (max) (A) 0.5 Vin (max) (V) -3.2 Vin (min) (V) -15 Vout (max) (V) -1.2 Vout (min) (V) -15 Fixed output options (V) -12, -5 Noise (µVrms) 200 Iq (typ) (mA) 0.2 Thermal resistance θJA (°C/W) 70 Rating Catalog Load capacitance (min) (µF) 4.7 Regulated outputs (#) 1 Accuracy (%) 2.5 Dropout voltage (Vdo) (typ) (mV) 250 Operating temperature range (°C) 0 to 70
SOIC (D) 8 29.4 mm² 4.9 x 6
  • Precision Negative Series Pass Voltage Regulation
  • 0.2 V Dropout at 0.5 A
  • Wide Input Voltage Range –3.2 V to –15 V
  • Low Quiescent Current Irrespective of Load
  • Simple Logic Shutdown Interfacing
  • –5 V, –12 V, and Adjustable Output
  • 2.5% Duty Cycle Short Circuit Protection

  • Precision Negative Series Pass Voltage Regulation
  • 0.2 V Dropout at 0.5 A
  • Wide Input Voltage Range –3.2 V to –15 V
  • Low Quiescent Current Irrespective of Load
  • Simple Logic Shutdown Interfacing
  • –5 V, –12 V, and Adjustable Output
  • 2.5% Duty Cycle Short Circuit Protection

The UCC384-x family of negative linear-series pass regulators is tailored for low-dropout applications where low-quiescent power is important. Fabricated with a BCDMOS technology ideally suited for low input-to-output differential applications, the UCC384-x passes 0.5 A while requiring only 0.2 V of input-voltage headroom. Dropout voltage decreases linearly with output current, so that dropout at 50 mA is less than 20 mV.

Quiescent current consumption for the device under normal (non-dropout) conditions is typically 200 uA. An integrated charge pump is internally enabled only when the device is operating near dropout with low VIN. This ensured that the device meets the dropout specifications even for maximum load current and a VIN of –3.2 V with only a modest increase in quiescent current. Quiescent current is always less than 350 uA, with the charge pump enabled. The quiescent current of the UCC384 does not increase with load current.

Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a tON delay. The device then stays off for a period, tOFF, that is 40 times the tON delay. The device then begins pulsing on and off at the tON/tOFF duty cycle of 2.5%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all required, must only accommodate normal operation. An external capacitor sets the on time. The off time is always 40 times tON.

The UCCx84-x can be shutdown to 45 uA (maximum) by pulling the SD/CT pin more positive than –0.7 V. To allow for simpler interfacing, the SD/CT pin may be pulled up to 6 V above the ground pin without turning on clamping diodes.

Internal power dissipation is further controlled with thermal-overload protection circuitry. Thermal shutdown occurs if the junction temperature exceeds 140°C. The chip remains off until the temperature has dropped 20°C (TJ = 120°C).

The UCC384-x family of negative linear-series pass regulators is tailored for low-dropout applications where low-quiescent power is important. Fabricated with a BCDMOS technology ideally suited for low input-to-output differential applications, the UCC384-x passes 0.5 A while requiring only 0.2 V of input-voltage headroom. Dropout voltage decreases linearly with output current, so that dropout at 50 mA is less than 20 mV.

Quiescent current consumption for the device under normal (non-dropout) conditions is typically 200 uA. An integrated charge pump is internally enabled only when the device is operating near dropout with low VIN. This ensured that the device meets the dropout specifications even for maximum load current and a VIN of –3.2 V with only a modest increase in quiescent current. Quiescent current is always less than 350 uA, with the charge pump enabled. The quiescent current of the UCC384 does not increase with load current.

Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a tON delay. The device then stays off for a period, tOFF, that is 40 times the tON delay. The device then begins pulsing on and off at the tON/tOFF duty cycle of 2.5%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all required, must only accommodate normal operation. An external capacitor sets the on time. The off time is always 40 times tON.

The UCCx84-x can be shutdown to 45 uA (maximum) by pulling the SD/CT pin more positive than –0.7 V. To allow for simpler interfacing, the SD/CT pin may be pulled up to 6 V above the ground pin without turning on clamping diodes.

Internal power dissipation is further controlled with thermal-overload protection circuitry. Thermal shutdown occurs if the junction temperature exceeds 140°C. The chip remains off until the temperature has dropped 20°C (TJ = 120°C).

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種類 タイトル 最新の英語版をダウンロード 日付
* データシート Low-Dropout 0.5-A Negative Linear Regulator データシート (Rev. D) 2002年 2月 5日
アプリケーション・ノート LDO Noise Demystified (Rev. B) PDF | HTML 2020年 8月 18日
アプリケーション・ノート LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 2017年 8月 9日

設計と開発

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パッケージ ピン数 ダウンロード
SOIC (D) 8 オプションの表示

購入と品質

記載されている情報:
  • RoHS
  • REACH
  • デバイスのマーキング
  • リード端子の仕上げ / ボールの原材料
  • MSL 定格 / ピーク リフロー
  • MTBF/FIT 推定値
  • 材質成分
  • 認定試験結果
  • 継続的な信頼性モニタ試験結果
記載されている情報:
  • ファブの拠点
  • 組み立てを実施した拠点

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