Technology Front
New Asynchronous Step-up DC-DC Converter
Published: Aug 20,20141131 Read
The HT7991 is a new high-efficiency Step-up DC/DC converter. Its CMOS technology and PWM (Pulse Width Modulation) technology ensures extremely low power consumption and high efficiency features. Its high cost/performance features make it the best choice for power bank applications.
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The HT7991 can operate with an input voltage range of 2.6V~5.5V and can output up to 12V. By using an integrated low impedance power transistor, with impedance down to 0.2Ω the device can obtain high-efficiency ratings of up to 90% at 5V/1A.
The integrated 1MHz frequency switching allows the use of smaller inductor values. Another advantage is its ultra-low standby current of only 0.1μA. A complete range of protection mechanisms include soft start function when power on, input under voltage lock-out (UVLO), over current protection (OCP), output over voltage protection (OVP) and over temperature protection (OTP), which combine to ensure the reliable and safe operation.
The device is available in a SOT23-6 package type, which makes it suitable for small size applications.
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