STEP-DOWN REGULATOR. TPS5405 Datasheet

TPS5405 REGULATOR. Datasheet pdf. Equivalent

TPS5405 Datasheet
Recommendation TPS5405 Datasheet
Part TPS5405
Description NON-SYNCHRONOUS STEP-DOWN REGULATOR
Feature TPS5405; TPS5405 www.ti.com SLVSBF7B – MAY 2012 – REVISED APRIL 2013 6.5-V TO 28-V INPUT VOLTAGE, 5-V FIXE.
Manufacture etcTI
Datasheet
Download TPS5405 Datasheet




Texas Instruments TPS5405
TPS5405
www.ti.com
SLVSBF7B – MAY 2012 – REVISED APRIL 2013
6.5-V TO 28-V INPUT VOLTAGE, 5-V FIXED OUTPUT, 2-A OUTPUT CURRENT,
NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET
Check for Samples: TPS5405
FEATURES
1
• Fixed 5-V Output
• 6.5-V to 28-V Wide Input Voltage Range
• Up to 2-A Maximum Continuous Output
Loading Current
• Pulse Skipping Mode to Achieve High Light
Load Efficiency
• Over 80% Efficiency at 10-mA Loading
• Adjustable 50-kHz to 1.1-MHz Switching
Frequency Set by an External Resistor
(Leave pin ROSC floating. Set frequency to
120 kHz)
• Peak Current-Mode Control
• Cycle-by-Cycle Over Current Protection
• Switching Node Anti-Ringing to Ease EMI
Issue
• External Soft Start
• Available in SOIC8 Package
APPLICATIONS
• 9-V, 12-V and 24-V Distributed Power Systems
• Consumer Applications Such as Home
Appliances, Set-Top Boxes, CPE Equipment,
LCD Displays, Peripherals, and Battery
Chargers
• Industrial and Car Entertainment Power
Supplies
DESCRIPTION
The TPS5405 is a monolithic non-synchronous buck regulator with wide operating input voltage range from 6.5 V
to 28 V. Current mode control with internal slope compensation is implemented to reduce component count.
TPS5405 also features a light load pulse skipping mode, which allows for a power loss reduction from the input
power supply to the system at light loading.
The switching frequency of the converters can be set from 50 kHz to 1.1 MHz with an external resistor.
Frequency spread spectrum operation is introduced for EMI reduction.
LX anti-ringing is added to address high frequency EMI issues.
A cycle-by-cycle current limit with frequency fold back protects the IC at over loading condition.
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 © 2012–2013, Texas Instruments Incorporated



Texas Instruments TPS5405
TPS5405
SLVSBF7B – MAY 2012 – REVISED APRIL 2013
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
TYPICAL APPLICATION
Cboot
Lo
Vout
1
BOOT
Cout
D
8
LX
Cin
Vin 2
7
VIN
GND
TPS5405
3
ROSC
6
COMP
Rc
Cc
Rosc
4
SS
5
VSENSE
Css
FUNCTIONAL BLOCK DIAGRAM
VIN
165°C
Thermal
Shutdown
VSENSE
Minimum Clamp
2µA
SS
gm
0.8V
Voltage
Reference
Discharge
Logic
Shutdown
COMP
Maximum
Clamp
Shutdown
Shutdown
Logic
Boot
Charge
PWM
Comparator
Gate
Drive
Logic
Boot
UVLO
2.1V
PWM
Latch
RQ
S
9A/V
Current
Sense
Σ
Slope
Compensation
BOOT
LX
VSENSE
Frequency
Shift
Oscillator
GND
ROSC
2
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Product Folder Links: TPS5405
Copyright © 2012–2013, Texas Instruments Incorporated



Texas Instruments TPS5405
www.ti.com
PCB LAYOUT
GROUND
TPS5405
SLVSBF7B – MAY 2012 – REVISED APRIL 2013
VOUT
VIN
1 BOOT
LX 8
2 VIN
GND 7
3 ROSC COMP 6
4 SS VSENSE 5
TA
–40°C to 85°C
PACKAGE (2)
8-pin SOIC (D)
ORDERING INFORMATION(1)
ORDERABLE PART NUMBER
TPS5405DR
TOP-SIDE MARKING
T5405
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
PIN OUT
D PACKAGE
(TOP VIEW)
BOOT
1
VIN
2
ROSC
3
SS
4
8
LX
7
GND
6
COMP
5
VSENSE
NAME
BOOT
VIN
ROSC
SS
VSENSE
COMP
GND
LX
TERMINAL FUNCTIONS
NO.
DESCRIPTION
1
A 0.1-µF bootstrap capacitor is required between BOOT and LX.
2
Input supply voltage, 6.5 V to 28 V
3
Switching frequency program pin. Connect a resistor to this pin to set the switching frequency. Leave the
pin open for 120-kHz switching frequency.
4
Soft start pin. An external capacitor connected to this pin sets the output rise time.
5
Output voltage feedback pin
6
Error amplifier output and input to the PWM comparator. Connect frequency compensation components to
this pin.
7
Ground
8
Switching node to external inductor
Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: TPS5405
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