LP5550
LP5550 is PowerWise Technology Compliant Energy Management manufactured by National Semiconductor.
Description
The LP5550 is a PWI 1.0 pliant Energy Management System for reducing power consumption of stand-alone mobile phone processors such as base-band or applications processors. The LP5550 contains an advanced, digitally controlled switching regulator for supplying variable voltage to processor core and memory. The device also incorporates 3 programmable LDO-regulators for powering I/O, PLLs and maintaining memory retention in shutdown-mode. The device is controlled via the PWI open-standard interface. The LP5550 operates cooperatively with Power Wise technology patible processors to optimize supply voltages adaptively over process and temperature variations or dynamically using frequency/voltage pre-characterized look-up tables.
Features n Supports high-efficiency Power Wise Technology Adaptive Voltage Scaling n PWI open standard interface for system power management n Digitally controlled intelligent voltage scaling n 1 MHz PWM switching frequency n Auto or PWI controlled PFM mode transition n Internal soft start/startup sequencing. n 3 programmable LDOs for I/O, PLL, and memory retention supply generation. n Power OK output.
Applications n n n n n GSM/GPRS/EDGE & UMTS cellular handsets Hand-held radios PDAs Battery powered devices Portable instruments
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System Diagram
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FIGURE 1. System Diagram
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© 2005 National Semiconductor Corporation DS201545 .national.
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Connection Diagrams and Package Mark Information
- Pin LLP NS Package Number SQA16A
FIGURE 2. LP5550 Pinout Package Mark et4U.
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Note: The actual physical placement of the package marking will vary from part to part. FIGURE 3. Top View
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Typical Application
FIGURE 4. Typical Application Circuit et4U.
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Pin Descriptions
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name SCLK SPWI RESETN VO2 VBAT1 VO1 DGND PWROK VBATSW SW SWGND VBAT2 VO3 VFB AGND ENABLE I/O I I/O I O P O G O P O G P O I G...
