TPS65720 Datasheet, PDF (1/50 Pages) Texas Instruments – PMU for Bluetooth Headsets

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PMU for Bluetooth Headsets
Check for Samples: TPS65720 TPS65721
TPS65720
TPS65721
SLVS979 – OCTOBER 2009
FEATURES
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•2 Battery Charger With Power Path Management
• 28 V Rated Power Path With:
– 100 mA Input Current Limit
– 500 mA input Current Limit
• 300 mA Charge Current
• 200 mA Step-Down Converter for TPS65720
• 400 mA Step-Down Converter for TPS65721
• Up to 92% Efficiency
• V_IN Range for DCDC Converter From 2.3V to
5.6V
• 2.25 MHz Fixed Frequency Operation
• Power Save Mode at Light Load Current
• Output Voltage Accuracy in PWM Mode ±2%
• 100% Duty Cycle for Lowest Dropout
• 1 General Purpose 200mA LDO
• V_IN Range for LDO From 1.8V to 5.6V
• I2C Compatible Interface
• 4GPIOs
• Available in a 25 Ball WCSP With 0,4mm Pitch
and in 4mm × 4mm 32-Pin QFN Package
APPLICATIONS
• Bluetooth Headsets
• Handheld Equipment
DESCRIPTION
The TPS65720 is a small power management unit
targeted for Bluetooth headsets or other portable low
power consumer end equipments. It contains an USB
friendly Lithium-Ion battery charger, a high efficient
step down converter, a low dropout linear regulator
and additional supporting functions. The device is
controlled by an I2C interface. Several settings can
be customized by the use of non volatile memory
which is factory programmed. The 2.25MHz
step-down converter enters a low power mode at light
load for maximum efficiency across the widest
possible range of load currents. For low noise
applications the devices can be forced into fixed
frequency PWM mode using the I2C compatible
interface. The device allows the use of small
inductors and capacitors to achieve a small solution
size. TPS65720 provides an output current of up to
200mA on the DCDC converter. The TPS65720 also
integrates one 200mA LDO. The LDO operates with
an input voltage range between 1.8V and 5.6V
allowing it to be supplied from the output of the
step-down converter or directly from the system
voltage.
The TPS65720 comes in a small 25-ball wafer chip
scale package (WCSP) with 0,4mm ball pitch or a
4mm × 4mm QFN package with a 0,4mm pitch
(TPS65721).
AC
1uF
3k
for a charge
current of 150mA
ISET
R5
SYS
ON /
OFF
R6
PB_IN
PGND
AGND
TPS65720
charger / power path
DCDC 1
200 mA
LDO 1
200 mA
reset
generator /
startup logic
I2C interface
GPIO or
5mA current
sink
BAT
BAT
TS
10k
NTC
SYS
SYS
LiIon
4.7uF / 6.3V
2.2uH
L1
R1
360 k
FB_DCDC1
R2
150k
VDCDC 1=2.05
V
4.7uF
22pF
VINLDO1
2.2uF
bluetooth chip
VLDO1
VLDO 1 = 1.85V
4.7uF / 4V
2 x 3.3k
RESET
INT
2 x 100k
Vin
Reset
INT
HOLD_LDO1
HOLD_DCDC1
GPIO
SCLK
SDAT
GPIO0
GPIO1
GPIO2
GPIO3
to SYS or VDCDC1
depending on LED
forward voltage
indication LEDs
SCLK
SDAT
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.
PowerPAD is a trademark of Texas Instruments.
2
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 © 2009, Texas Instruments Incorporated