TPS62740 Datasheet, PDF (1/32 Pages) Texas Instruments – 360nA IQ Step Down Converter for Low Power Applications

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TPS62740
SLVSB02A – NOVEMBER 2013 – REVISED NOVEMBER 2013
360nA I_Q Step Down Converter for Low Power Applications
Check for Samples: TPS62740
FEATURES
1
•23 Input Voltage Range V_IN from 2.2V to 5.5V
• Typ. 360nA Quiescent Current
• Up to 90% Efficiency at 10µA Output Current
• Up to 300mA Output Current
• 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 SON Package
APPLICATIONS
• Bluetooth^® Low Energy, RF4CE, Zigbee
• Industrial Metering
• Energy Harvesting
DESCRIPTION
The TPS62740 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^TM based device extends the
light load efficiency range below 10µA load currents.
It supports output currents up to 300mA. 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.
TPS62740 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 TPS62740 is available in a small 12 pin
2 × 3mm² SON package and supports a total
solutions size of 31mm².
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
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.
DCS-Control is a trademark of Texas Instruments.
2
Bluetooth is a registered trademark of Bluetooth SIG, Inc..
3
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 © 2013, Texas Instruments Incorporated