製品概要

機能と利点

  • High Efficiency: Up to 93%
  • Constant Frequency Adaptive Power Operation
  • Input Voltage Range: 3V to 13.5V
  • Internal 0.6Ω Power Switch (VIN = 10V)
  • Low Dropout Operation: 100% Duty Cycle
  • Low-Battery Detector
  • Internal Power-On Reset Timer
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Low Quiescent Current: 470µA
  • Shutdown Mode Draws Only 15µA Supply Current
  • ±1% Reference Accuracy
  • Available in 16- and 20-Lead Narrow SSOP

製品概要

The LTC1433/LTC1434 are monolithic pulse width modulated step-down DC/DC converters. By utilizing current mode switching techniques, they provide excellent AC and DC load and line regulation. Both devices operate at a fixed frequency with the LTC1434 phase-lockable to an external clock signal.

Both devices incorporate two internal P-channel power MOSFETs with a parallel combined resistance of 0.6Ω (at a supply of 10V). The Adaptive Power output stage selectively drives one or both of the switches at frequencies up to 700kHz to reduce switching losses and maintain high efficiencies at low output currents.

The LTC1433/LTC1434 are capable of supplying up to 450mA of output current and boasts a ±2.4% output voltage accuracy. An internal low-battery detector has the same level of accuracy as the output voltage. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (300ms typ) after the output is within 5% of the regulated output voltage.

Ideal for current sensitive applications, the devices draw only 470µA of quiescent current. In shutdown the devices draw a mere 15µA. To further maximize the life of the battery source, the internal P-channel MOSFET switch is turned on continuously in dropout.

Applications

  • Cellular Telephones
  • Portable Instruments
  • Wireless Modems
  • RF Communications
  • Distributed Power Systems
  • Scanners
  • Battery-Powered Equipment

製品ライフサイクル icon-not-recommended 最終販売

このファミリーの全製品について製造中止が予定されています。製品の最終購入をご検討の場合は、弊社営業担当、あるいは販売代理店にお問い合わせください。また、「製造中止情報」 をご覧いただき、最終受注期限および最終引き受け納期をご確認ください。

評価キット (1)

ツール

LTspice

LTspice®は、無料で提供される強力で高速な回路シミュレータと回路図入力、波形ビューワに改善を加え、アナログ回路のシミュレーションを容易にするためのモデルを搭載しています。

 

LTspice

下記製品はLTspiceで使用することが出来ます。:

LTC1434

設計リソース

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

サンプル&購入


サンプルは、外部のADI Sample Siteでのご注文となります。選択したパーツはSample Siteログイン後、カートに引き継がれます。Sample Siteを初めて使用する際は、アカウント登録をお願いいたします。Sample Siteに関するご質問は、SampleSupport@analog.com までお問合せください。

 

モデル一覧の項目説明