SC900 Datasheet, PDF (1/23 Pages) Semtech Corporation – Programmable Penta ULDO with RESET and I2C Interface

SC900
Programmable Penta ULDO with
RESET and I²C Interface
POWER MANAGEMENT
Description
The SC900 is a highly integrated power management
device for low power portable applications. The device
contains five adjustable low-dropout linear regulators
(LDOs) with CMOS pass-devices as well as a band-gap
reference, I²C interface, and DACs to control the output
voltages.
Many features of the SC900 are programmable through
the I²C interface. These include the ability to indepen-
dently turn on any combination of the five regulators. All
five of the LDO output voltages are programmable in
50mV steps from 1.45V to 3.00V. Each LDO can have
an active shutdown or nonactive shutdown program op-
tion through the interface. There is also a reset monitor
flag that is associated with LDOA. In addition, the device
has a separate programmable power-good monitor flag
that activates when one or more LDOs go out of regula-
tion.
Features
! Five LDO regulators in one package
! I²C interface with multiple device capability
! Independent I²C enable/disable of LDOs
! Independent I²C control of output voltages
! Low thermal impedance of 40°C per watt
! 150mV dropout at 150mA
! Input range from 2.7V to 5.5V
! Programmable power-good flag
! Minimal number of external components
! Over temperature protection
! Small 4mm x 4mm 20-lead MLPQ package
! Small input/output filter capacitors
! Programmable V_OUT range - 1.45V to 3.00V for
each LDO
The SC900 offers significant quiescent current and space
savings to the system designer by sharing reference and
biasing among five LDOs. The small and thermally effi-
cient 20-lead MLPQ package make it ideal for use in por-
table products where minimizing layout area is critical.
Typical Application Circuit
Applications
! Palmtop/Laptop computers
! Personal Digital Assistants
! Cellular telephones
! Battery-powered equipment
! High efficiency linear power supplies
4.7µF
VBAT
SC900
VIN
INA
INB
INCD
INE
EN
LDOPGD
ARST
SDA
SCL
A0
GND
LDOE
LDOD
LDOA
LDOB
LDOC
VREF
VASEL
DGND
2.2µF 2.2µF 2.2µF
0.1µF
Keypad
Baseband
Processor
Audio
Processing
Digital Interface
2.2µF
Receiver
Section
TXCO
&
Synthesizer
Transmitter
Section
2.2µF
LNA
PA
March 29, 2005
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