TPS62090 Datasheet, PDF (1/26 Pages) Texas Instruments – 3A High Efficient Synchronous Step Down Converter with DCS™ Control

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TPS62090, TPS62091
TPS62092, TPS62093
SLVSAW2A – MARCH 2012 – REVISED MARCH 2012
3A High Efficient Synchronous Step Down Converter with DCS™ Control
Check for Samples: TPS62090, TPS62091, TPS62092, TPS62093
FEATURES
1
•2 2.5 V to 6 V Input Voltage Range
• DCS™ Control
• 95% Converter Efficiency
• Power Save Mode
• 20 µA Operating Quiescent Current
• 100% Duty Cycle for Lowest Dropout
• 2.8 MHz/1.4 MHz Typical Switching Frequency
• 0.8 V to V_IN Adjustable Output Voltage
• Fixed Output Voltage Versions
• Output Discharge Function
• Adjustable Softstart
• Two Level Short Circuit Protection
• Output Voltage Tracking
• Wide Output Capacitance Selection
• Available in 3x3mm 16 Pin QFN Package
APPLICATIONS
• Distributed Power Supplies
• Notebook, Netbook Computers
• Hard Disk Drivers
• Processor Supply
• Battery Powered Applications
DESCRIPTION
The TPS6209x device family is a high frequency
synchronous step down converter optimized for small
solution size, high efficiency and suitable for battery
powered applications. To maximize efficiency, the
converter operates in PWM mode with a nominal
switching frequency of 2.8 MHz/1.4 MHz and
automatically enters Power Save Mode operation at
light load currents. When used in distributed power
supplies and point of load regulation, the device
allows voltage tracking to other voltage rails and
tolerates output capacitors ranging from 10 µF up to
150 µF and beyond. Using the DCS™ Control
topology the device achieves excellent load transient
performance and accurate output voltage regulation.
The output voltage start-up ramp is controlled by the
softstart pin, which allows operation as either a
standalone power supply or in tracking configurations.
Power sequencing is also possible by configuring the
Enable and Power Good pins. In Power Save Mode,
the device operates at typically 20 µA quiescent
current. Power Save Mode is entered automatically
and seamlessly maintaining high efficiency over the
entire load current range.
Vin
2.5V to 6V
C1
10mF
C3
10nF
C4
10nF
TPS62090
12
PVIN
1
SW
11
PVIN
2
SW
10 _AVIN
13 _EN
16
VOS
FB ⁵
7
CP
8 _CN
PG ⁴
3
FREQ
9 _SS
AGND ⁶
PGND PGND
14 15
L1
470nH
Vout
1.8V/3A
C2
22mF
R3
500k
Power Good
100
95
90
85
80
75
70
65
60
55
50
100m
V_OUT = 3.3 V
L = 1 µH
f = 1.4 MHz
1
10
100
I load (mA)
V_IN = 3.7 V
V_IN = 4.2 V
V_IN = 5 V
1k
10k
G002
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.
All trademarks are the property of their respective owners.
2
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