TPS62746_15 Datasheet, PDF (1/25 Pages) Texas Instruments – TPS62746 300 mA High Efficiency Buck Converter with Ultra-low Quiescent Current and VIN Switch

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TPS62746
SLVSD27A – JUNE 2015 – REVISED AUGUST 2015
TPS62746 300 mA High Efficiency Buck Converter with Ultra-low Quiescent Current and
VIN 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
• 360nA Operational Quiescent Current
• Up to 90% Efficiency at 10-µA Output Current
• Power Save Mode Operation
• Selectable Output Voltages
– 1.2V and 1.8V TPS62746
• Output Voltage Discharge
• 1 mA /150 Ω Integrated Input Voltage Switch
• Low Output Voltage Ripple
• Automatic Transition to No Ripple 100% Mode
• RF Friendly DCS-Control™
• Total Solution Size <10mm²
• Small 1.6 x 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 TPS62746 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. TPS62746 provides an output current of
100mA. 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 TPS62746 provides two programmable output
voltages of 1.2V and 1.8V selectable by one voltage
select pin. The TPS62746 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 TPS62746 has an integrated 1-mA switch that
connects the supply voltage at pin VIN to the output
VINSW. This low current switch that can be used to
disconnect a resistor divider from the input supply
typically being used to measure the input voltage with
an ADC.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS62746
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 2F
TPS62746
VIN
EN
VSEL
SW
VOS
CTRL
GND VINSW
L 2.2 2H
VOUT
COUT
10 2F
Low Power
MCU & RF
ADC
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
0.001 0.01
0.1
1
10
I_OUT (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.