HT7750B

HOLTEK Semiconductor Inc.
HT77xxB 5V/100mA PFM Asynchronous Step-up Converter Features General Description • Low startup voltage: 0.85V (Typical) The HT77xxB 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...
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HT77xxB 5V/100mA PFM Asynchronous Step-up Converter Features General Description • Low startup voltage: 0.85V (Typical) The HT77xxB 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, 3-pin SOT23 and 5-pin SOT23 The HT77xxB series consist of an oscillator, a PFM control circuit, a driver transistor, 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, 3-pin SOT23 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 D1: 1N5817 L1: 47μH~100μH (Coil Inductor) VIN LX VOUT OUT HT77xxB C1: 47μF OFF ON CE R1* GND C2: 22μF (Ceramic) * R1=0.15Ω is recommended to improve ripple performance Selection Table Part No. Output Voltage HT7718B 1.8V HT7722B 2.2V HT7727B 2.7V HT7730B 3.0V HT7733B 3.3V HT7737B 3.7V HT7750B 5.0V Packages SOT89 SOT23 SOT23-5 Markings 77xxB marking for SOT89 type 7xxB marking for SOT23 and SOT23-5 types Note: ″xx″ stands for output voltages. Rev. 1.30 1 August 17, 2021 PDF
Документация на HT7718B 

Дата модификации: 17.08.2021

Размер: 1.48 Мб

23 стр.

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