TPS62125 Datasheet, PDF (1/37 Pages) Texas Instruments – 3V-17V, 300mA Step Down Converter With Adjustable Enable Threshold And Hysteresis

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TPS62125
SLVSAQ5A – MARCH 2012 – REVISED APRIL 2012
3V-17V, 300mA Step Down Converter With Adjustable Enable Threshold And Hysteresis
Check for Samples: TPS62125
FEATURES
1
• Wide Input Voltage Range 3V to 17V
• Input SVS (Supply Voltage Supervisor) with
Adjustable Threshold / Hysteresis Consuming
typ. 6µA Quiescent Current
• Wide Output Voltage Range 1.2V to 10V
• Typ. 13 µA Quiescent Current
• 350nA typ. Shutdown Current
• Seamless Power Save Mode Transition
• DCS-Control^TM Scheme
• Low Output Ripple Voltage
• Up to 1MHz Switching Frequency
• Highest Efficiency over Wide V_IN and V_OUT
Range
• Pin to Pin Compatible with TPS62160/70
• 100% Duty Cycle Mode
• Power Good Open Drain Output
• Output Discharge Function
• Small 2x2mm² SON 8 pin Package
APPLICATIONS
• Embedded processing
• 4 cell alkaline, 1-4 cell Li-Ion battery powered
applications
• 9V - 15V standby power supply
• Energy harvesting
• Inverter (negative VOUT)
DESCRIPTION
The TPS62125 is a high efficiency synchronous step
down converter optimized for low and ultra low power
applications providing up to 300mA output current.
The wide input voltage range of 3V to 17V supports
four cell alkaline and 1 to 4 cell Li-Ion batteries in
series configuration as well as 9V to 15V powered
applications. The device includes a precise low power
enable comparator which can be used as an input
supply voltage supervisor (SVS) to address system
specific power up and down requirements. The
enable comparator consumes only 6µA quiescent
current and features an accurate threshold of 1.2V
typical as well as an adjustable hysteresis. With this
feature, the converter can generate a power supply
rail by extracting energy from a storage capacitor fed
from high impedance sources such as solar panels or
current loops. With its DCS - Control ^TM scheme the
converter provides power save mode operation to
maintain highest efficiency over the entire load
current range. At light loads the converter operates in
PFM mode (pulse frequency modulation) and
transitions seamlessly and automatically in PWM
(pulse width modulation) mode at higher load
currents. The DCS - Control^TM scheme is optimized
for low output ripple voltage in PFM mode in order to
reduce output noise to a minimum and features
excellent AC load regulation. An open drain power
good output indicates once the output voltage is in
regulation.
V_IN = 4V to 17V
C_IN
10µF
TPS62125
VIN
SW
VOS
EN
FB
EN_hys
L 15µH
R₁
1.8M
R₂
576k
V_OUT = 3.3V
up to 300mA
C_OUT
10µF
GND
R_pullup
PG
PWR GOOD
95
10mA
100mA
90
85
250mA
80
1.0mA
75
70
65
V_OUT = 3.3V
60
L = 15mH VLF302515
C_OUT = 10mF
55
0.25mA
0.1mA
50
4 5 6 7 8 9 10 11 12 13 14 15 16 17
Input Voltage V_IN(V)
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.
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 © 2012, Texas Instruments Incorporated