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 typ. High voltage conversion efficiency: 99.9% Small (S-MINI) package Applications Cellular phones Package SMINI-5DA Block Diagram C2 GND 5 4 S2 S1 S3 OSC S4 1 2 3 V V C1 IN OUT Publication date: June 2006 SDE00001CEB 1AN1201SM Pin Descriptions Pin No. Symbol Description 1V Supply voltage pin IN 2V Inverted output pin OUT 3 C1 Charge pump capacitor s positive polarity side connecting pin 4 GND Ground pin 5 C2 Charge pump capacitor s negative polarity side connecting pin Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage V 3.3 V IN Supply current I 10 mA IN Output current I 20 mA O 2 * Power dissipation P 48 mW D 2 * Operating ambient temperature T 30 to +85 C opr 1 * Storage temperature T 55 to +125 C stg 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 T = 25C. a *2: T = 85C, For the independent IC without a heat sink. a Recommended Operating Range Parameter Symbol Range Unit Supply voltage V 2.0 to 3.0 V IN Electrical Characteristics at V = 2.5 V, C1 = 1 F, T = 25C IN a Parameter Symbol Conditions Min Typ Max Unit Consumption current I No load 0.25 1 mA CC Oscillator frequency f No load 90 125 160 kHz OSC Output resistance R Load 500 50 OUT Voltage conversion efficiency V No load 95.0 99.9 % Power efficiency P Load 500 80 89 % Consumption current in Sleep mode I V = 0.2 V, no load 1 A OFF IN Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Unless otherwise specified: V = 2.5 V, T = 25C IN a Parameter Symbol Conditions Min Typ Max Unit Oscillator frequency f V = 2.5 V, no load 66 125 198 kHz OSC IN T = 30C to 85C a 2 SDE00001CEB