TPS650250 Datasheet, PDF (1/35 Pages) Texas Instruments – Power Management IC for Li-Ion Powered Systems

TPS650250
www.ti.com ........................................................................................................................................................................................... SLVS843 – DECEMBER 2008
Power Management IC for Li-Ion Powered Systems
FEATURES
1
• 1.6A, 97% Efficient Step-Down Converter for
System Voltage (VDCDC1)
– 3.3V or 2.8V or Adjustable
• 0.8A, up to 95% Efficient Step-Down Converter
for Memory Voltage (VDCDC2)
– 1.8V or 2.5V or Adjustable
• 0.8A, 90% Efficient Step-Down Converter for
Processor Core (VDCDC3)
• adjustable output voltage on VDCDC3
• 30mA LDO for Vdd_alive
• 2 × 200mA General Purpose LDOs (LDO1 and
LDO2)
• Dynamic Voltage Management for Processor
Core
• LDO1 and LDO2 Voltage Externally Adjustable
• Separate Enable Pins for Inductive Converters
• 2.25MHz Switching Frequency
• 85µA Quiescent Current
• Thermal Shutdown Protection
APPLICATIONS
• Cellular/Smart Phone
• GPS
• Digital Still Camera
• Split Supply DSP and µP Solutions
• Samsung ARM-Based Processors, etc.
DESCRIPTION
The TPS650250 is an integrated Power Management
IC for applications powered by one Li-Ion or
Li-Polymer cell, which require multiple power rails.
The TPS650250 provides three highly efficient,
step-down converters targeted at providing the core
voltage, peripheral, I/O and memory rails in a
processor based system. All three step-down
converters enter a low power mode at light load for
maximum efficiency across the widest possible range
of load currents. The converters can be forced into
fixed frequency PWM mode by pulling the MODE pin
high.
The TPS650250 also integrates two general purpose
200mA LDO voltage regulators, which are enabled
with an external input pin. Each LDO operates with
an input voltage range between 1.5V and 6.5V
allowing them to be supplied from one of the
step-down converters or directly from the battery. The
output voltage of the LDOs can be set with an
external resistor divider for maximum flexibility.
Additionally there is a 30mA LDO typically used to
provide power in a processor based system to a
voltage rail that is always on. TPS650250 comes in a
small 5mm x 5mm 32 pin QFN package (RHB).
Functional Block Diagram
1R
Vbat
1 mF
Vbat
10 mF
VCC
VINDCDC1
ENABLE
EN_DCDC1
TPS650250
DCDC1 (I/O)
STEP-DOWN
CONVERTER
1600 mA
L1
2.2 mH
VDCDC1
DEFDCDC1
PGND1
3.3 V / 2.8 V
or adjustable
R1
22 mF
R2
Vbat
10 mF
ENABLE
VINDCDC2
EN_DCDC2
DCDC2
(memory)
STEP-DOWN
CONVERTER
800 mA
L2
2.2 mH
VDCDC2
DEFDCDC2
PGND2
2.5 V / 1.8 V
or adjustable
R3
22 mF
R4
Vbat
10 mF
ENABLE
PWM/ PFM
VINDCDC3
EN_DCDC3
MODE
DCDC3 (core)
STEP-DOWN
CONVERTER
800 mA
L3
2.2 mH
VDCDC3
DEFDCDC3
PGND3
R5
22 mF
R6
VIN
ENABLE
VIN_LDO
EN_LDO
ENABLE
EN_Vdd_alive
Vbat
VCC
R11
PWRFAIL _SNS
-
R12
+
Vref = 1 V
VLDO1
200 mA LDO
VLDO2
200 mA LDO
VLDO3
30 mA LDO
VLDO1
FB_LDO1 ^R7
2.2 mF
R8
VLDO2
FB_LDO2 ^R9
2.2 mF
R10
Vdd_alive
1V
2.2 mF
PWRFAIL
I/O voltage
R19
AGND1
AGND2
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated