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900844 Datasheet(PDF) 64 Page - Freescale Semiconductor, Inc

Part # 900844
Description  Integrated Power Management IC for Ultra-mobile and Embedded Applications
PDF  118 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

900844 Datasheet(HTML) 64 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
64
Freescale Semiconductor
900844
FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
The output current is measured internally, digitized by the ADC, and stored in a register for the processor to access.
The peak current is sensed internally for over-current protection purposes. If an over-current condition is detected, the
regulator will limit the current through cycle by cycle operation and alert the system through the V21FAULT signal, which will in
turn assert the VRFAULT Interrupt signal.
Figure 30. V21 Detailed Internal Block Diagram
Main Features
• Uses the VPWR rail as its power supply
• It is used as a pre-regulator to many LDO rails, for enhanced efficiency and reduced thermal dissipation.
• Uses Integrated MOSFETs
•4.0 MHz switching frequency
• High efficiency operating modes depending on load conditions
• Output can be discharged through the low side switch.
• Peak current sensing with over-current protection
• Uses internal compensation
• Gate drive circuits are supplied directly from VPWR
Efficiency Curves
Figure 31 efficiency curves are calculated under PWM mode, based on the recommended external component values and
typical output voltage of 2.1 V. 3.0 V
≤ VPW ≤ 4.4 V.
Driver
Controller
EA
VREF
Z1
Z2
Internal
Compensation
PVIN 21
SW21
FB21
ISENSE5
VPWR
CO21
CIN 21
L21
SPI
Interface
PGND21
V21
CTLV21
AOACCTLV21
V21FAULT



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