TPS62120 Datasheet, PDF (1/33 Pages) Texas Instruments – 15V, 75mA High Efficient Buck Converter

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15V, 75mA High Efficient Buck Converter
Check for Samples: TPS62120 , TPS62122
TPS62120
TPS62122
SLVSAD5 – JULY 2010
FEATURES
1
• Wide Input Voltage Range 2V to 15V
• Up to 96% Efficiency
• Power Save Mode with 11 µA Quiescent
Current
• Output Current 75mA
• Output Voltage Range 1.2V to 5.5V
• Up to 800kHz Switch Frequency
• Synchronous Converter, no External Rectifier
• Low Output Ripple Voltage
• 100% Duty Cycle for Lowest Dropout
• Small SOT 8 pin (TPS62120) and 2x2 SON 6
pin (TPS62122) Package
• Internal Soft Start
• Power Good Open Drain Output TPS62120
• Open Drain Output for Output Discharge
TPS62120
• 2.5V Rising / 1.85V Falling UVLO Thresholds
APPLICATIONS
• Low Power RF Applications
• Ultra Low Power Microprocessor
• Energy Harvesting
• Industrial Measuring
DESCRIPTION
The TPS6212X device family is a high efficient
synchronous step down DC-DC converter optimized
for low power applications. It supports up to 75mA
output current and allows the use of tiny external
inductors and capacitors.
The wide operating input voltage range of 2V to 15V
supports energy harvesting, battery powered and as
well 9V or 12V line powered applications.
With its advanced hysteretic control scheme the
converter provides power save mode operation. At
light loads the converter operates in PFM mode
(pulse frequency modulation) and transitions
automatically in PWM (pulse width modulation) mode
at higher load currents. The Power Save Mode
maintains high efficiency over the entire load current
range. The hysteretic control scheme is optimized for
low output ripple voltage in PFM mode in order to
reduce output noise to a minimum. It consumes only
10uA quiescent current from VIN in PFM mode
operation.
In shutdown mode, the device is turned off.
An open drain power good output is available in the
TPS62120 and indicates once the output voltage is in
regulation.
TPS62120 has an additional SGND pin which is
connected to GND during shutdown mode. This
output can be used to discharge the output capacitor.
The TPS62120 is available in a small 3×3 mm² 8 pin
SOT 23 package and the TPS62122 in a 2×2 mm² 6
pin SON package.
V_IN = 2.5 V to 15 V
C_IN
4.7 mF
TPS62120
VIN
SW
EN
FB
GND
VOUT
SGND
PG
L 22 mH
R₁
300 kW
R₂
240 kW
V_OUT = 1.8 V
up to 75 mA
Cff
22 pF
C_OUT
4.7 mF
R _{pullup 100kW}
PWR GOOD
100
V_IN = 5.5 V
90
80
70
60
50
40
30
0.1
V_IN = 8 V
V_IN = 10 V
V_IN = 15 V ^{VIN = 12 V}
1
10
I_O - Output Current - mA
V_O = 5 V,
L = 18 mH,
LPS3015,
C_O = 4.7 mF
100
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 © 2010, Texas Instruments Incorporated