ETA9635 データシートの表示（PDF） - Unspecified

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ETA9635

Power Management Unit for Power Banks

Unspecified 

ETA9635

VOUT

ISW

1ms/div

VOUT

ISW

1ms/div

VOUT

VIN

2ms/div

FUNCTIONAL DECRIPTIONS

Loop Operation

The ETA9635 is a wide input range, high-efficiency, DC-to-DC step-up switching regulator, capable of delivering up to 3W of

output power, integrated with a 150mΩ high side MOSFET and 150 mΩ synchronous rectifier. It uses a PWM current-mode

control scheme. An error amplifier integrates error between the FB signal and the internal reference voltage. The output of the

integrator is then compared to the sum of a current-sense signal and the slope compensation ramp. This operation generates a

PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation for output voltage.

Light Load Operation

Traditionally, a fixed constant frequency PWM DC-DC regulator always switches even when the output load is small. When

energy is shuffling back and forth through the power MOSFETs, power is lost due to the finite RDSONs of the MOSFETs and

parasitic capacitances. At light load, this loss is prominent and efficiency is therefore very low. ETA9635 employs a proprietary

control scheme that improves efficiency in this situation by enabling the device into a power save mode during light load,

thereby extending the range of high efficiency operation.

Short-Circuit Protection

Unlike most step-up converters, the ETA9635 allows for short circuits on the output. In the event of a short circuit, the device

first turns off the NMOS when the sensed current reaches the current limit. After VOUT drops below VIN the device then enters a

linear charge period with the current limited same as with the start-up period. In addition, the thermal shutdown circuits

disable switching if the die temperature rises above 165°C.

Down Mode (VIN>VOUT) Operation

The ETA9635 will continue to supply the output voltage even when the input voltage exceeds the output voltage. Since the PMOS

no longer acts as a low-impedance switch in this mode, power dissipation increases within the IC to cause a sharp drop in

efficiency. Limit the maximum output current to maintain an acceptable junction temperature.

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