SC905 Datasheet, PDF (1/21 Pages) Semtech Corporation – CDMA Cellular Phone Power Management IC

POWER MANAGEMENT
Description
The SC905 is a power management integrated circuit
(PMIC) designed for the latest CDMA chip sets. The device
provides four general purpose low dropout regulators
(LDOs), and five low noise LDOs designed for analog cir-
cuits. The VMOT LDO can be used as a general purpose
regulator or as an adjustable motor drive output that can
supply up to 150mA to drive a vibrator motor.
Each LDOs enable and output voltage are controlled via
the I²C bus. An optional three-wire interface compatible
with Semtech battery charger ICs is also controlled via the
I²C bus.
Initial power-on is achieved by activating either the ON or
the HFPWR signal, and the PGOOD input is used by the
microprocessor to latch power on or disable the device.
The small and thermally efficient MLPQ-32 package and
use of ceramic bypass capacitors, minimize the required
PCB area making the SC905 ideal for space-conscious
portable applications.
SC905
CDMA Cellular Phone
Power Management IC
Features
9 LDO Linear Regulators
CORE: 1.35V - 2.90V @ 300mA
ANA: 2.55V - 2.90V @ 200mA
PAD: 1.35V - 2.90V @ 300mA
RX: 2.55V - 2.90V @ 150mA
TX: 2.55V - 2.90V @ 150mA
TCXO: 2.55V - 2.90V @ 80mA
PLL: 2.55V - 2.90V @ 80mA
Camera: 1.35V - 2.90V @ 100mA
Motor Drive: 1.35V - 2.90V @ 150mA
I²C Interface for Microprocessor Control
Less than 1μA Quiescent Current in Shutdown
65dB PSRR for Analog LDOs
Over-Temperature Protection
Power-On Control
Optional Interface for Controlling Semtech
Battery Chargers
Small 5mm x 5mm 32-Pin QFN Package
Applications
CDMA Cellular Handsets
Palmtop/Laptop Computers
Battery Powered Equipment
Typical Application Circuit
Battery
Charger
Circuit
ON/OFF
Handsfree
Option
MOTOR
SC905
CPB
CHRGB
FAULTB
VBAT
IN1
IN2
IN3
IN4
IN5
ON
HFPWR
PGOOD
SDA
SCL
PWRON
RESB
IN6
DVIN
VCORE
VPAD
VANA
VTCXO
VPLL
VTX
VMOT
VRX
VCAM
BP
0.1μF
VPSEL
VCSEL
AGND _DGND
VBAT
10μF
BATTERY
1μF
1μF
1μF
1μF
1μF
1μF
Baseband
1μF
Processor
1μF
Keypad
Audio
Processing
TCXO
+
Synthesiser
PLL
Transmitter
PA
Section
Receiver ^LNA
Section
Camera
Module
Digital
Interface
June 7, 2006
1
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