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ML4890

Micro Linear
Part Number ML4890
Manufacturer Micro Linear
Description High Efficiency / Low Ripple Boost Regulator
Published May 7, 2005
Detailed Description Extend G nge RIN Ra TU erature A p m e E T l F ia c r e m ed Com °C to 70°C ent –20 Equipm ndheld a H le tab for Por A...
Datasheet PDF File ML4890 PDF File

ML4890
ML4890

Overview
Extend G nge RIN Ra TU erature A p m e E T l F ia c r e m ed Com °C to 70°C ent –20 Equipm ndheld a H le tab for Por April 1997 ML4890 High Efficiency, Low Ripple Boost Regulator GENERAL DESCRIPTION The ML4890 is a high efficiency, PFM (Pulse Frequency Modulation), boost switching regulator connected in series with an integrated LDO (Low Dropout Regulator) that incorporates “Silent Switcher™” technology.
This technique incorporates a patented tracking scheme to minimize the voltage drop across the LDO and increase the total efficiency of the regulator beyond that which can be obtained by using a discrete external LDO regulator.
The ML4890 is designed to convert single or multiple cell battery inputs to regulated output voltages for integrated circuits and is ideal for portable communications equipment that cannot tolerate the output voltage ripple normally associated with switching regulators.
An integrated synchronous rectifier eliminates the need for an external Schottky diode and provides a lower forward voltage drop, resulting in higher conversion efficiency.
FEATURES s s Incorporates “Silent Switcher™” technology to deliver very low output voltage ripple (typically 5mV) Guaranteed full load start-up and operation at 1.
0V input and low operating quiescent current (<100µA) for extended battery life Pulse Frequency Modulation and internal synchronous rectification for high efficiency Minimum external components Low ON resistance internal switching MOSFETs 5V, 3.
3V, and 3V output versions s s s s BLOCK DIAGRAM L1 *CIN VIN C2 1 VL 6 5 VBOOST VBAT 7 SHDN VOUT 4 BOOST CONTROL FEEDBACK LDO CONTROL C1 VOUT + 2 VREF 3 FROM POWER MANAGEMENT GND PWR GND 8 – Patent Pending *Optional 1 ML4890 PIN CONNECTION ML4890-5/-3/-T 8-Pin SOIC (S08) VIN VREF GND VOUT 1 2 3 4 8 7 6 5 PWR GND SHDN VL VBOOST TOP VIEW PIN DESCRIPTION PIN NO.
PIN NO.
NAME FUNCTION NAME FUNCTION 1 2 3 4 VIN VREF GND VOUT Battery input voltage 200mV reference output Analog ...


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