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ML4880, ML4890, ML4890-5

Table of contents:
Info of ML4880
Info of ML4890
Info of ML4890-5

ML4880, ML4890, ML4890-5 Selling Leads, Datasheet

MFG:ML Package Cooled:SMD D/C:07/08+

ML4880, ML4890, ML4890-5 Datasheet download

Five Points

Part Number: ML4880

MFG: ML

Package Cooled: SMD

D/C: 07/08+

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ML4880 General Description

The ML4880 Portable PC and PCMCIA Power Controller is a complete solution for DC/DC power conversion for portable computing systems with single or multiple PCMCIA slots.

The device provides two synchronous buck controllers to implement mixed voltage systems and a flyback controller for 12V VPP generation for PCMCIA slots. The flyback architecture enables generation of high currents (150mA or more per slot) on the 12V bus for multiple slot PCMCIA applications.

Each regulator can be independently switched off to fully isolate the load from the power supply. The PFM architecture will automatically adjust switching frequency at light loads in order to maintain power conversion efficiencies in excess of 90% over a wide output power range.

ML4880 Maximum Ratings

Absolute maximum ratings are those values beyond
which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and
functional device operation is not implied.
V_IN ................................................................................. 20V
Peak Driver Output Current ............................................. 2A
V_FB Voltage .............................................. GND 0.3V to 6V
ISENSE Voltage ..................................................... ±500mV
All Other Analog Inputs .............. GND 0.3V to V_IN + 0.3V
All Digital Inputs ....................... GND 0.3V to V_REG + 0.3V
Junction Temperature ............................................... 150°C
Storage Temperature Range ....................65°C to 150°C
Lead Temperature (Soldering, 10 sec) ...................... 150°C
Thermal Resistance (_JA) ........................................ 80°C/W
V_INRange .......................................................... 5.5V to 18V
Temperature Range
ML4880CS ....................................................... 0°C to 70°C
ML4880ES .................................................. 20°C to 70°C

ML4880 Features

·Regulation to ±3% maximum: provides 2% PCMCIA switch matrix margin
·Two synchronous buck controllers for 3.3/3V, 5V generation, and a flyback for high current, 12V generation from 5.5V to 18V input
·Regulator power conversion efficiencies > 90%
·Pulse frequency modulation for high efficiency operation
·Independent regulator shutdown for full load isolation
·Adjustable current limit
·Wide input voltage range (5.5V to 18V)

ML4880 Connection Diagram

ML4890 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 pocommunications
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.

ML4890 Maximum Ratings

V_BOOST.......................................................................7V
Voltage on Any Other Pin...GND 0.3V to V _BOOST+0.3V
Peak Switch Current (I_PEAK).......................................1A
Average Switch Current (I_AVG).............................500mA
LDO Output Current.............................................250mA
Junction Temperature...........................................150°C

Temperature Range
ML4890CS-X..............................................0°C to +70°C
ML4890ES-X..........................................20°C to +70°C
V_IN Operating Range
ML4890CS-X....................................................1.0V to 6V
ML4890ES-X.....................................................1.1V to 6V

ML4890 Features

Incorporates "Silent Switcher™" technology to deliver
very low output voltage ripple (typically 5mV)
Guaranteed full load start-up and operation at

1.0Vinput 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

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