TPS62120_15 Datasheet, PDF (1/34 Pages) Texas Instruments – TPS6212x 15-V, 75-mA Highly Efficient Buck Converter

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TPS62120, TPS62122
SLVSAD5A – JULY 2010 – REVISED AUGUST 2015
TPS6212x 15-V, 75-mA Highly Efficient Buck Converter
1 Features
•1 Wide Input Voltage Range: 2 V to 15 V
• Up to 96% Efficiency
• Power Save Mode With 11-µA Quiescent Current
• Output Current 75 mA
• Output Voltage Range: 1.2 V to 5.5 V
• Up to 800-kHz Switch Frequency
• Synchronous Converter, No External Rectifier
• Low Output Ripple Voltage
• 100% Duty Cycle for Lowest Dropout
• Small SOT 8-Pin (TPS62120) and 2-mm × 2-mm
DFN 6-Pin (TPS62122) Package
• Internal Soft Start
• Power Good Open Drain Output (TPS62120)
• Open-Drain Output for Output Discharge
(TPS62120)
• 2.5-V Rising and 1.85-V Falling UVLO Thresholds
2 Applications
• Low Power RF Applications
• Ultra Low Power Microprocessors
• Energy Harvesting
• Industrial Measuring
3 Description
The TPS6212x device is a highly efficient
synchronous step-down DC-DC converter optimized
for low-power applications. The device supports up to
75-mA output current and allows the use of tiny
external inductors and capacitors.
The wide operating input voltage range of 2 V to 15 V
supports energy harvesting, battery powered and as
well 9-V or 12-V line powered applications.
With its advanced hysteretic control scheme, the
converter provides power save mode operation. At
light loads the converter operates in pulse frequency
modulation (PFM) mode and transitions automatically
in pulse width modulation (PWM) 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. The device consumes only 10-
µA 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.
The 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 TPS6212x operates over an free air temperature
range of –40°C to 85°C. The TPS62120 is available
in a small 8-pin SOT-23 package and the TPS62122
in a 2 mm × 2 mm 6-pin DFN package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS62120
SOT-23 (8)
2.90 mm × 1.63 mm
TPS62122
SON (6)
2.00 mm × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
V_IN = 2.5 V to 15 V
C_IN
4.7 mF
Typical Application Schematic
TPS62120
VIN
SW
EN
FB
L 22 mH
R₁
300 kW
V_OUT = 1.8 V
up to 75 mA
Cff
22 pF
C_OUT
4.7 mF
GND
R₂
240 kW
VOUT
SGND
PG
R _{pullup 100kW}
PWR GOOD
Efficiency vs Output Current
100
V_IN = 5.5 V
90
80
70
V_IN = 8 V
V_IN = 10 V
V_IN = 15 V ^{VIN = 12 V}
60
50
40
30
0.1
1
10
I_O - Output Current - mA
V_O = 5 V,
L = 18 mH,
LPS3015,
C_O = 4.7 mF
100
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.