TPS57140-Q1 Datasheet, PDF (1/49 Pages) Texas Instruments – 1.5-A 42-V STEP-DOWN SWIFT™ DC/DC CONVERTER WITH Eco-mode™ CONTROL

TPS57140-Q1
www.ti.com
SLVSAP3A – DECEMBER 2010 – REVISED MARCH 2011
1.5-A 42-V STEP-DOWN SWIFT™ DC/DC CONVERTER
WITH Eco-mode™ CONTROL
Check for Samples: TPS57140-Q1
FEATURES
1
•2 Qualified for Automotive Applications
• 3.5-V to 42-V Input Voltage Range
• 200-mΩ High-Side MOSFET
• High Efficiency at Light Loads With
Pulse-Skipping Eco-mode™ Control Scheme
• 116-μA Operating Quiescent Current
• 1.5-μA Shutdown Current
• 100-kHz to 2.5-MHz Switching Frequency
• Synchronizes to External Clock
• Adjustable Slow Start/Sequencing
• Undervoltage and Overvoltage Power Good
Output
• Adjustable Undervoltage Lockout Voltage and
Hysteresis
• 0.8-V Internal Voltage Reference
• Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/s
witcherpro.html)
• For SWIFT™ Documentation, See the TI
Website at http://www.ti.com/swift
APPLICATIONS
• 12-V and 24-V Industrial and Commercial Low
Power Systems
• Aftermarket Automotive Accessories: Video,
GPS, Entertainment
DESCRIPTION
The TPS57140-Q1 device is a 42-V 1.5-A step-down regulator with an integrated high-side MOSFET.
Current-mode control provides simple external compensation and flexible component selection. A low-ripple
pulse-skip mode reduces the no load, regulated output supply current to 116 μA. Using the enable pin, shutdown
supply current is reduced to 1.5 μA.
Undervoltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage
startup ramp is controlled by the slow start pin that can also be configured for sequencing/tracking. An
open-drain power good signal indicates the output is within 92% to 109% of its nominal voltage.
A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold
back and thermal shutdown protects the part during an overload condition.
The TPS57140-Q1 is available in a 10-pin thermally enhanced MSOP PowerPAD™ package (DGQ) and a
10-pin SON package (DRC).
SIMPLIFIED SCHEMATIC
VIN
PWRGD
TPS57140-Q1
EFFICIENCY
vs
LOAD CURRENT
90
85
80
EN
BOOT
75
PH
70
SS/TR
RT/CLK
COMP
VSENSE
GND
65
60
V_I = 12 V,
V_O = 3.3 V,
55
f_sw = 1200 kHz
50
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2
Load Current - A
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.
Eco-mode, SwitcherPro, SWIFT, PowerPAD are trademarks of Texas Instruments.
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 © 2010–2011, Texas Instruments Incorporated