Document
ESMT/EMP
EMQ9904
4 Channel Power Management IC For Portable Devices
GENERAL DESCRIPTION
The EMQ9904 is a high efficiency, 4-channel power management IC for battery-powered, portable devices application. It integrates a high efficiency step-up DC/DC converter, a linear regulator and two high efficiency step-down DC/DC converters. The step-up DC/DC converter (CH1) can start up 0.9V typically with operating voltage down to 0.6V and up to 500mA loading capability. It features with extreme low 26μA quiescent current with no load, which is the best fit for extending battery life during the standby mode. The linear regulator (CH2) features ultra-high power
supply rejection ratio (75dB at 1kHz), low output voltage noise (30µV), low dropout voltage (270mV), low quiescent current (110µA) and fast transient response. It operates from 2.5V to 5.5V input voltage, up to 600mA loading capability and regulates adjustable output voltage from 1.2V to 5.0V.
FEATURES
. Battery powered Synchronous boost Converter * 1.8V to 5.5V Output Voltage * Up to 93% Efficiency * Output Current up to 500mA * Typical Iq 26μA with No Load * 1.1V to 5.5V operating Voltage * 0.9V start-up input voltage . Linear Regulator * 1.2V to 5.0V Output Voltage * 75dB Typical PSRR at 1kHz * 30µV RMS Output Voltage Noise (10Hz to 100kHz) * 270mV Typical Dropout at 600mA . Two Synchronous Buck Converters * 0.6V to 5.5V Output Voltage * Up to 95% Efficiency * Low Dropout Operation: 100% Duty Cycle .No Schottky Diode Needed for Above Converters .Shutdown Current < 1μA(CH1-CH4) .Independent Enable PIN (CH1-CH4) .Independent Input Voltage PIN(CH1-CH4) .No External Compensation Network is needed .Excellent Line and Load Transient Response (CH1-CH4) .Over Current Protection(CH1-CH4) .Over Temperature Protection(CH2, CH3, CH4)
The two Synchronous Buck converters (CH3, CH4) operate from 2.5V to 5.5V input voltage, up to 600mA loading capability and regulate adjustable output voltage from 0.6V to 5.5V. It features low quiescent current, 1.5MHz internal frequency operation. The EMQ9904 is available in TQFN24 4x4 package, It is Green compliant (RoHS and Halogen-free).
APPLICATIONS
.Hand-held Instruments .Battery-powered systems .Portable information applications .Wireless Networking .Digital Still Cameras
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : May 2009 Revision : 2.0 1/29
ESMT/EMP
EMQ9904
Figure 1. Typical Application
CONNECTION DIAGRAM
TQFN24 4x4
ORDER INFORMATION
EMQ9904-00HC24NRR 00 HC24 NRR Adjustable output voltage TQFN-24 Package
RoHS & Halogen free
Rating: -40 to 85°C Package in Tape & Reel
Elite Semiconductor Memory Technology Inc./Elite MicroPower Inc.
Publication Date : May 2009 Revision : 2.0 1/29
ESMT/EMP
Order, Mark & Packing Information
Package Product ID Marking
EMQ9904
Packing
TQFN24
EMQ9904-00HC24NRR
3K units Tape & Reel
TERMINAL FUNCTIONS
NAME LX1 OUT1 FB1 TERMINAL NO. 1 2 3 I/O I B I DESCRIPTION CH1 Switch PIN. Must be con.