TPS62748_15 Datasheet, PDF (1/22 Pages) Texas Instruments – TPS62748 300 mA High Efficiency Buck Converter with Ultra-low Quiescent Current and Load Switch

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TPS62748
SLVSD37A – SEPTEMBER 2015 – REVISED OCTOBER 2015
TPS62748 300 mA High Efficiency Buck Converter with Ultra-low Quiescent Current and
Load Switch
1 Features
•1 Input Voltage Range V_IN from 2.15 V to 5.5 V
• Input Voltage Range Down to 2.0 V Once Started
• 300 mA Output Current
• 360 nA Operational Quiescent Current
• Up to 90% Efficiency at 10-µA Output Current
• Power Save Mode Operation
• Selectable Output Voltages
– 1.2 V and 1.8 V
• Output Voltage Discharge
• 100 mA/2.2 Ω Integrated Load Switch
• Low Output Voltage Ripple
• Automatic Transition to No Ripple 100% Mode
• RF Friendly DCS-Control™
• Total Solution Size <10mm²
• Small 1.6 mm × 0.9 mm, 8 Ball WCSP Package
2 Applications
• Wearables
• Fitness Tracker
• Smart Watch
• Health Monitoring
• Bluetooth^® Low Energy, RF4CE, Zigbee
• High-efficiency, Ultra Low Power Applications
• Energy Harvesting
3 Description
The TPS62748 is a high efficiency step down
converter with ultra low quiescent current of typical
360 nA. The device is optimized to operate with a
2.2-µH inductor and 10µF output capacitor. The
device uses DCS-Control™ and operates with a
typical switching frequency of 1.2 MHz. In Power
Save Mode the device extends the light load
efficiency down to a load current range of 10-µA and
below. TPS62748 provides an output current of 300
mA. Once started the device operates down to an
input voltage range of 2.0 V. This allows to operate
the device directly from a single Li-MnO₂ coin cell.
The TPS62748 provides two programmable output
voltages of 1.2V and 1.8V selectable by one voltage
select pin. The TPS62748 is optimized to provide a
low output voltage ripple and low noise using a small
output capacitor. Once the input voltage comes close
to the output voltage the device enters the No Ripple
100% mode to prevent an increase of output ripple
voltage. In this operation mode the device stops
switching and turns the high side MOSFET switch on.
The TPS62748 has a 100 mA load switch between
pins VOS and LOAD with a typical ON-resistance of
0.6 Ohm. The load switch is typically used to
distribute the buck converter output voltage to the
sub-system.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS62748
DSBGA (8)
1.6 mm × 0.9 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Typical Application
VIN
2.0V to 5.5V
CIN
4.7 PF
TPS62748
VIN
EN
VSEL
SW
VOS
CTRL
L 2.2 PH
VOUT
COUT
10 PF
Low Power
MCU & RF
GND LOAD
Sensor
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
0.001 0.01
0.1
1
10
IOUT (mA)
VIN = 3.6 V
VIN = 4.2 V
VIN = 5.0 V
100
1000
D006
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.