TPS62770 Datasheet, PDF (1/37 Pages) Texas Instruments – Multi-Rail DC/DC Converter For Wearable Applications

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TPS62770
SLVSCX0A – FEBRUARY 2016 – REVISED MARCH 2016
TPS62770 Multi-Rail DC/DC Converter For Wearable Applications
1 Features
•1 VIN Range 2.5 V to 5.5 V
• 370 nA Iq Step-Down Converter
– 8 Selectable Output Voltages (1.0V to 3.0V)
– 300 mA Output Current
– Output Discharge Function
• Slew Rate Controlled Load Switch with Discharge
Function
• Dual Mode Step-Up Converter
– Load Disconnect
– Constant Output Voltage Adjustable up to 15 V
(V_FB 0.8 V) / 12 V Fixed
– LED Current Driver with PWM to Current
Conversion (max V_FB Voltage 200 mV @ D =
100%)
• Tiny 16pin 1.58 x 1.58mm WCSP Package 0.4mm
pitch
2 Applications
• Wearable and Personal Electronics
• Fitness Accessories
• Health Monitoring and Medical Accessories
3 Description
The TPS62770 is a tiny power solution for wearable
applications including a 370nA ultra low Iq step-down
converter, a slew rate controlled load switch and a
dual mode step-up converter. The output voltage of
the step-down converter can be selected with three
VSEL pins between 1.0 V, 1.05 V, 1.1 V, 1.2 V, 1.8
V, 1.9 V, 2.0 V and 3.0 V. The output voltage can be
changed during operation. In shutdown mode, the
output of the step-down converter is pulled to GND.
The integrated load switch is internally connected to
the output of the step-down converter and features
slew rate control during turn on phase. Once turned
off, its output is connected to GND.
The dual mode step-up converter can generate a
constant output voltage up to 15 V, such as PMOLED
supply; or, a constant output current, such as LED
back light supply. The output voltage can be adjusted
up to 15 V with external resistors, or set to fixed 12 V
by connecting the FB pin to VIN. The device features
an internal over voltage protection of 17.7 V in case
the FB node is left open or tight to GND. It includes
an internal rectifier and load disconnect function.
When used as constant output current driver, the
device offers a PWM to analog converter to scale
down the reference voltage according to the duty
cycle of the PWM signal.
The device is available in a small 16pin 0.4mm pitch
WCSP package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS62770
DSBGA (16)
1.58mm x 1.58mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
C_IN
10mF
VIN
EN1
VSEL3
VSEL2
VSEL1
TPS62770
DC/DC 1
Step Down Converter
L1 = 2.2mH
SW1
VO1
C_OUT1
10mF
VOUT1 = 1.8V/300mA
MCU / BLE
ON/OFF CTRL
Load Switch
LOAD
Load Output = 1.8V
Sensors
L2 = 10mH
SW2
EN2/PWM
FB
BM
DC/DC 2
Step up converter
VO2
C_OUT2
10mF
VOUT2 = 12V / 30mA
PMOLED
GND1 GND2
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.