TPS62740_16 Datasheet, PDF (1/32 Pages) Texas Instruments – 360nA IQ Step Down Converter For Low Power Applications

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TPS62740, TPS62742
SLVSB02B – NOVEMBER 2013 – REVISED JULY 2014
TPS6274x 360nA I_Q Step Down Converter For Low Power Applications
1 Features
•1 Input Voltage Range V_IN from 2.2V to 5.5
• Typ. 360nA Quiescent Current
• Up to 90% Efficiency at 10µA Output Current
• Up to 300mA / 400mA Output Current
(TPS62740/TPS62742)
• RF Friendly DCS-Control ^TM
• Up to 2 MHz Switching Frequency
• Low Output Ripple Voltage
• 16 Selectable Output Voltages in 100mV Steps
between 1.8V to 3.3V
• Automatic Transition to No Ripple 100% Mode
• Slew Rate Controlled Load Switch
• Discharge Function on VOUT / LOAD
• Power Good Output
• Optimized for Operation with a Tiny 2.2µH
Inductor and 10µF C_OUT
• Total Solution Size <31mm²
• Small 2 x 3 mm² WSON Package
2 Applications
• Bluetooth^® Low Energy, RF4CE, Zigbee
• Industrial Metering
• Energy Harvesting
3 Description
The TPS6274x is industry's first step down converter
featuring typ. 360nA quiescent current and operating
with a tiny 2.2µH inductor and 10µF output capacitor.
This new DCS-Control™ based device extends the
light load efficiency range below 10µA load currents.
TPS62740 supports output currents up to 300mA,
TPS62742 up to 400mA. The device operates from
rechargeable Li-Ion batteries, Li-primary battery
chemistries such as Li-SOCl2, Li-MnO2 and two or
three cell alkaline batteries. The input voltage range
up to 5.5V allows also operation from a USB port and
thin-film solar modules. The output voltage is user
selectable by four VSEL pins within a range from
1.8V to 3.3V in 100mV steps. TPS6274x features low
output ripple voltage and low noise with a small
output capacitor. Once the battery voltage comes
close to the output voltage (close to 100% duty cycle)
the device enters no ripple 100% mode operation to
prevent an increase of output ripple voltage. The
device then stops switching and the output is
connected to the input voltage. The integrated slew
rate controlled load switch provides typ. 0.6Ω on-
resistance and can distribute the selected output
voltage to a temporarily used sub-system. The
TPS6274x is available in a small 12 pin 2 × 3mm²
WSON package and supports a total solutions size of
31mm².
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS62740
TPS62742
WSON
3.00 mm × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Typical Application
V_IN
2.2V - 5.5V
C_IN
10mF
TPS62740
VIN
EN
VSEL1
VSEL2
VSEL3
VSEL4
GND
SW
VOUT
PG
CTRL
LOAD
L
2.2mH
2.1V
Main rail
V_CC
C_OUT
R_{pull up}
10mF
Switched
supply rail
V_CC
Subsystem
(Sensors)
100
New
95 ^TPS62740
90
TPS62740 extends
85
light load efficiency range
down to 10mA output current
80
75
Current
DCS-Control^TM topology
70
65
60
0.001 0.01
V_IN = 3.6V
V_OUT = 3.3V
0.1
1
10 100 1000
Output Current (mA)
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.