Product category:
Power Supply ICs and Controllers
News Release from: Pulsar Electronics | Subject: Semtech SC4601
Edited by the Electronicstalk Editorial
Team on 07 May 2003
Step down controller is LDO when
batteries falter
A highly efficient low-voltage controller features a programmable duty cycle from 0-100% to maximise battery life in low-power applications.
The SC4601 manufactured by Semtech Corp is a voltage-mode step-down (buck) regulator controller that provides accurate high-efficiency power conversion from an input supply range of 2.7 to 6V The device features a high level of integration, reducing external component count and making it ideal for low voltage applications where cost, size and efficiency are critical
This article was originally published on Electronicstalk on 7 May 2003 at 8.00am (UK)
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The SC4601 drives external complementary power mosfets: P-channel on the high side and N-channel on the low side.
The use of high-side P-channel mosfets eliminates the need for an external charge pump and simplifies the high-side gate driver.
For enhanced power efficiency, the device can drop into a sleep mode, which typically draws only 10uA.
Moreover, the SC4601's switching frequency can be synchronised to an external oscillator of up to 700kHz.
Soft-start operation, spread over 5ms, prevents output voltage spikes during startup and a built in +/-1%-accurate 0.8V reference maintains voltage accuracy.
Geared for the latest low voltage designs the SC4601 supplies 5V to a low 0.8V making it ideal for applications such as distributed power architectures, local microprocessor core supplies, DSP and I/O power, battery powered systems and telecommunications and datacommunications equipment.
Devices are packaged in compact 10-pin MSOPs, and data, samples and evaluation boards are available from Pulsar Electronics.
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