TPS62730_12 Datasheet, PDF (1/28 Pages) Texas Instruments – Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications

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TPS62732, TPS62733
TPS62730
SLVSAC3C – MAY 2011 – REVISED DECEMBER 2012
Step Down Converter with Bypass Mode for Ultra Low Power Wireless Applications
Check for Samples: TPS62732, TPS62733, TPS62730
FEATURES
1
•2 Input Voltage Range V_IN from 1.9V to 3.9V
• Typ. 30 nA Ultra Low Power Bypass Mode
• Typ. 25 μA DC/DC Quiescent Current
• Internal Feedback Divider Disconnect
• Typ. 2.1Ω Bypass Switch between V_IN and V_OUT
• Automatic Transition from DC/DC to Bypass
Mode
• Up To 3MHz switch frequency
• Up to 95% DC/DC Efficiency
• Open Drain Status Output STAT
• Output Peak Current up to 100mA
• Fixed Output Voltages 1.9V, 2.05V, 2.1V, 2.3V
• Small External Output Filter Components
2.2μH/ 2.2μF
• Optimized For Low Output Ripple Voltage
• Small 1 × 1.5 × 0.6mm³ SON Package
• 12 mm² Minimum Solution Size
APPLICATIONS
• CC2540 Bluetooth™ Low Energy
System-On-Chip Solution
• Low Power Wireless Applications
• RF4CE, Metering
29
I_BAT NO TPS62730
27
25
Battery Current
Reduction @
23
CC2540
0dBm CW TX
Power
21
I_BAT With TPS62730
19
Battery Current Reduction of CC2540
17
2.4GHz Bluetooth Low Energy
System-On-Chip Solution
15
2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8
Battery Voltage - V_BAT
DESCRIPTION
The TPS62730 is a high frequency synchronous step
down DC-DC converter optimized for ultra low power
wireless applications. The device is optimized to
supply TI's Low Power Wireless sub 1GHz and
2.4GHz RF transceivers and System-On-Chip-
solutions. The TPS62730 reduces the current
consumption drawn from the battery during TX and
RX mode by a high efficient step down voltage
conversion. It provides up to 100mA output current
and allows the use of tiny and low cost chip inductors
and capacitors. With an input voltage range of 1.9V to
3.9V the device supports Li-primary battery
chemistries such as Li-SOCl2, Li-SO2, Li-MnO2 and
also two cell alkaline batteries.
The TPS62730 features an Ultra Low Power bypass
mode with typical 30nA current consumption to
support sleep and low power modes of TI's CC2540
Bluetooth Low Energy and CC430 System-On-Chip
solutions. In this bypass mode, the output capacitor
of the DC/DC converter is connected via an
integrated typ. 2.1Ω Bypass switch to the battery.
In DC/DC operation mode the device provides a fixed
output voltage to the system. With a switch frequency
up to 3MHz, the TPS62730 features low output ripple
voltage and low noise even with a small 2.2uF output
capacitor. The automatic transition into bypass mode
during DC/DC operation prevents an increase of
output ripple voltage and noise once the DC/DC
converter operates close to 100% duty cycle. The
device automatically enters bypass mode once the
battery voltage falls below the transition threshold
V_{IT BYP} . The TPS62730 is available in a 1 × 1.5mm²
6 pin QFN package.
V_IN
2.2V - 3.9V*
C_IN
2.2µF
ON
BYP
TPS62730
VIN
GND
SW
VOUT
ON/BYP STAT
* At V_IN < 2.2V, V_OUT tracks V_IN
V_OUT
L 2.2mH _2.1V
C_OUT
2.2µF
R_pullup
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.
Bluetooth is a trademark of Bluetooth SIG.
2
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2012, Texas Instruments Incorporated