PT1311-High Efficiency Synchronous Boost DC/DC Converter
PT1311 是一款低啟動電壓，率的同步整流升壓型直流-直流轉換器。輸入一節AA干電池能提供100mA/3.3V電流能力。1.2MHz開關頻率減小了外圍元器件尺寸,降低了系統成本。電流模式工作使其具備良好的電源和負載變化的響應，并具有逐開關電感峰值限流。內部環路補償進一步減少了外圍元器件。振鈴電路減少了由非連續模式工作帶來的EMI。PFM 模式了輕載時的轉換效率。(微橋)輸出短路保護避免了輸出短路時對電池的損害。
GENERAL DCRIPTION
The PT1311 is a high efficiency synchronous fixed frequency step-up DC/DC converter. The device is available in an adjustable version and fixed output voltag of 3.3V or 5.0V. Supply current during operation is only 25μA and drops to ≤1μA in shutdown. The 0.85V to 4.2V input voltage range mak the PT1311 ideally suited for single Li-Ion battery or single AA battery applications. Automatic Burst Mode operation increas efficiency at light loads, further extending battery life. Switching frequency is internally set at 1.2MHz, allowing the use of all surface mount inductors and capacitors. The internal synchronous switch increas efficiency and eliminat the need for an external Schottky diode. Anti-ringing control circuitry reduc EMI concerns by damping the inductor in DCM mode. The internal short protect circuitry can protect battery when output short to ground. The PT1311 is available in a SOT23-6 package.
FEATUR
High Efficiency: Up to 93%
Very Low Quicent Current: Only 25μA During Operation
600mA Output Current
0.85V to 4.2V Input Voltage Range
1.2MHz Constant Frequency Operation
No Schottky Diode Required
Anti-ringing Control Minimiz EMI
Output Short Protect
Shutdown Mode Draws≤1μA Supply Current
Current Mode Operation for Excellent Line and Load Transient Rponse
Over temperature Protected
Feedback Voltage Auto Detect
SOT23-6 Package
APPLICATIONS
Li-ion Battery Chargers
U Audio Devic
Wirels Mice
Dial Still Cameras
MP3/MP4 Players
Portable Instruments
TYPICAL APPLICATION DIAGRAM
