HT7733C

HOLTEK Semiconductor Inc.
HT77xxC 5V PFM Asynchronous Step-up Controller Features General Description • Low startup voltage: 0.85V (Typical) The HT77xxC series is a set of PFM step-up DC/DC converters with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only few external components to provide a fixed output voltage of 1.8V, 2.2V, 2.7V, ...
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HT77xxC 5V PFM Asynchronous Step-up Controller Features General Description • Low startup voltage: 0.85V (Typical) The HT77xxC series is a set of PFM step-up DC/DC converters with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only few external components to provide a fixed output voltage of 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V and 5.0V. CMOS technology ensures low supply current and makes them ideal for battery-operated applications powered from one or more cells. • High efficiency up to 85% • Ultra low no load input current • High output voltage accuracy: ±2.5% • Fixed output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V and 5.0V • Ultra low shutdown current: 0.1μA (Typical) • Package type: 3-pin SOT89 and 5-pin SOT23 The HT77xxC series consist of an oscillator, a PFM control circuit, a gate driver, a reference voltage unit and a high speed comparator. They employ pulse frequency modulation (PFM) for minimum supply current and ripple at light output loading. These devices are available in space saving 3-pin SOT89 and 5-pin SOT23 packages. For the 5-pin SOT23 package, it also contains a chip enable function to reduce power consumption during shutdown mode. Applications • One, two and three cell alkaline and NiMH/NiCd bettery powered portable products • Portable equipment/handheld devices Typical Application Circuits L1: 47μH~100μH (Coil Inductor) D1: 1N5817 VIN C1: 47μF (Ceramic) Cb: 10nF OUT Rb: 300Ω ZXTN25020CFH OFF VOUT HT77xxC R1* EXT CE ON * R1=0.15Ω is recommended to improve ripple performance GND C2: 22μF (Ceramic) Selection Table Part No. Output Voltage HT7718C 1.8V HT7722C 2.2V HT7727C 2.7V HT7730C 3.0V HT7733C 3.3V HT7737C 3.7V HT7750C 5.0V Packages SOT89 SOT23-5 Markings 77xxC marking for SOT89 type 7xxC marking for SOT23-5 type Note: ″xx″ stands for output voltages. Rev. 1.10 1 August 01, 2018 PDF
Документация на HT7730C 

Дата модификации: 01.08.2018

Размер: 1.95 Мб

14 стр.

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