ICs for Telephone AN1201SM Polarity inverting charge pump DC/DC converter IC ■ Overview AN1201SM is a negative voltage generation IC for bias voltage of transmission power module of cellular phones. This IC is a polarity inverting DC/DC converter to change from positive voltage into negative voltage. ■ Features • High power conversion efficiency: 89% typ. (when output current is 5 mA.) • Low output resistance: 20 Ω typ. • High voltage conversion efficiency: 99.9% • Small (S-MINI) package ■ Applications • Cellular phones ■ Package • SMINI-5DA ■ Block Diagram C2 GND 5 OSC Publication date: June 2006 S2 S1 1 2 VIN VOUT 4 S3 S4 SDE00001CEB 3 C1 1 AN1201SM ■ Pin Descriptions Pin No. Symbol Description 1 VIN Supply voltage pin 2 VOUT Inverted output pin 3 C1 4 GND 5 C2 Charge pump capacitor's positive polarity side connecting pin Ground pin Charge pump capacitor's negative polarity side connecting pin ■ Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage VIN 3.3 V Supply current IIN 10 mA IO 20 mA PD 48 mW Topr −30 to +85 °C Tstg −55 to +125 °C Output current Power dissipation *2 Operating ambient temperature Storage temperature *1 *2 Note) 1. Do not apply external currents or voltages to any pins not specifically mentioned. For circuit currents, (+) denotes current flowing into the IC, and (−) denotes current flowing out of the IC. 2. *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: Ta = 85°C, For the independent IC without a heat sink. ■ Recommended Operating Range Parameter Supply voltage Symbol Range VIN Unit 2.0 to 3.0 V ■ Electrical Characteristics at VIN = 2.5 V, C1 = 1 µF, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Consumption current ICC No load 0.25 1 mA Oscillator frequency fOSC No load 90 125 160 kHz Output resistance ROUT Load 500 Ω 50 Ω 95.0 99.9 % Voltage conversion efficiency Vη No load Power efficiency Pη Load 500 Ω 80 89 % VIN = 0.2 V, no load 1 µA Consumption current in Sleep mode IOFF • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Unless otherwise specified: VIN = 2.5 V, Ta = 25°C Parameter Oscillator frequency 2 Symbol fOSC Conditions VIN = 2.5 V, no load Ta = −30°C to 85°C SDE00001CEB Min Typ Max Unit 66 125 198 kHz AN1201SM ■ Technical Data • PD Ta curves of SMINI-5DA PD Ta Power dissipation PD (W) 0.200 0.150 Independent IC without a heat sink Rth( j-a) = 833.3˚C/W 0.120 0.100 0.050 0.048 0.000 0 25 50 75 85 100 125 Ambient temperature Ta (°C) ■ Application Circuit Example C2 GND 5 S2 4 1 µF S1 OSC 1 S4 2 VIN ICC 2.2 µF S3 VCC VOUT 100 µH 1 µF SDE00001CEB 3 C1 1 µF Load 500 Ω 3 Request for your special attention and precautions in using the technical information and semiconductors described in this book (1) If any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and regulations of the exporting country, especially, those with regard to security export control, must be observed. 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