製品概要
機能と利点
- 1.6V to 5.5V Input Voltage Range
- 0.62V to 5.5V Output Voltage Range
- Internal Soft-Start
- Selectable 1.7MHz or 2.6MHz Constant Frequency Operation
- Internal Oscillator Can Be Synchronized to an External Clock, 1MHz to 3MHz Range
- High Efficiency: Up to 95%
- 65μA Quiescent Current, Burst Mode® Operation
- 600mA Output Current (VIN = 1.8V, VOUT = 1.2V)
- 750mA Peak Inductor Current
- No Schottky Diode Required
- Low Dropout Operation: 100% Duty Cycle
- 0.612V Reference Voltage
- Stable with Ceramic Capacitors
- Shutdown Mode Draws <1μA Supply Current
- Current Mode Operation for Excellent Line and Load Transient Response
- Overtemperature Protection
- Available in a Low Profile (0.75mm)
- 8-Lead (3mm × 3mm) DFN Package
製品概要
The LTC3409A is a high efficiency, monolithic synchronous buck regulator using a constant frequency, current mode architecture. The LTC3409A improves upon the LTC3409’s light load regulation in Burst Mode operation. The output voltage is adjusted via an external resistor divider.
Fixed switching frequencies of 1.7MHz and 2.6MHz are supported. Alternatively, an internal PLL will synchronize to an external clock in the frequency range of 1MHz to 3MHz. This range of switching frequencies allows the use of small surface mount inductors and capacitors, including ceramics.
Supply current during Burst Mode operation is only 65μA dropping to <1μA in shutdown. The 1.6V to 5.5V input voltage range makes the LTC3409A ideally suited for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Burst Mode operation can be user-enabled, increasing efficiency at light loads, further extending battery life.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Internal soft-start offers controlled output voltage rise time at startup without the need for external components.
| VREF Tolerance | |
| LTC3409 | VREF Tolerance |
| LTC3409A | ±3% |
Applications
- Cellular Phones
- Digital Cameras
- MP3 Players
製品ライフサイクル
製造中
この製品ファミリーの1つ以上の型番が生産／供給中です。新規の設計に適していますが、より新しい代替製品を提供している場合があります。
ドキュメント
Reliability Data (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。
下記製品はLTspiceで使用することが出来ます。:
LTpowerCAD
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Design tools for the following parts are available in LTpowerCAD:
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.
サポート ＆ ディスカッション
サンプル＆購入
価格は1個当たりの米ドルで、米国内における販売価格（FOB）で表示されておりますので、予算のためにのみご使用いただけます。 また、その価格は変更 されることがあります。米国以外のお客様への価格は、輸送費、各国の税金、手数料、為替レートにより決定されます。価格・納期等の詳細情報については、弊社正規販売代理店または担当営業にお問い合わせください。なお、 評価用ボードおよび評価用キットの表示価格は1個構成としての価格です。
