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TPS61080DRCTG4 Datasheet(PDF) 2 Page - Texas Instruments

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Part # TPS61080DRCTG4
Description  HIGH VOLTAGE DC/DC BOOST CONVERTER WITH 0.5-A/1.3-A INTEGRATED SWITCH
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61080DRCTG4 Datasheet(HTML) 2 Page - Texas Instruments

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background image
L
1
10
SW
Charge
Pump
2
VIN
EN
SC
Ramp
Generator
Oscillator
FB
5
Clamp
MUX
BandGap
1.229V
SS
EN
PWM
Control
Current
Sensor
Error
Amplifer
OVP
Thermal
Shutdown
OVP
ShortCircuit
9
OUT
FSW
7
PGND
8
SC
OVP
1.2MHz
600KHz
6
3
GND
4
+
FB
R1
R2
R3
C3
C2
Cs
C1
L1
TPS61080
TPS61081
SLVS644D – FEBRUARY 2006 – REVISED APRIL 2013
www.ti.com
PIN FUNCTIONS
PIN
I/O
DESCRIPTION
NAME
NO.
The inductor is connected between this pin and the SW pin. This pin connects to the source of the isolation
L
1
I
FET as well. Minimize trace area at this pin to reduce EMI.
Input pin to the IC. It is the input to the boost regulator, and also powers the IC circuit. It is connected to
VIN
2
I
the drain of the isolation FET as well.
Enable pin. When the voltage of this pin falls below enable threshold for more than 74ms, the IC turns off
EN
6
I
and consumes less than 2
μA current.
GND
4
Signal ground of the IC
Power ground of the IC. It is connected to the source of the PWM switch. This pin should be made very
PGND
8
close to the output capacitor in layout.
Voltage feedback pin for the output regulation. It is regulated to an internal reference voltage. An external
FB
5
I
voltage divider from the output to GND with the center tap connected to this pin programs the regulated
voltage. This pin can also be connected to a low side current sense resistor to program current regulation.
Output of the boost regulator. When the output voltage exceeds the 27V overvoltage protection (OVP)
OUT
9
O
threshold, the PWM switch turns off until Vout drops 0.7V below the overvoltage threshold.
SW
10
I
Switching node of the IC. Connect the inductor between this pin and the L pin.
SS
3
I
Soft start programming pin. A capacitor between the SS pin and GND pin programs soft start timing.
Switching frequency selection pin. Logic high on the pin selects 1.2MHz, while logic low reduces the
FSW
7
I
frequency to 600KHz for better light load efficiency.
The thermal pad should be soldered to the analog ground. If possible, use thermal via to connect to ground
Thermal Pad
plane for ideal power dissipation.
FUNCTIONAL BLOCK DIAGRAM
2
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Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: TPS61080 TPS61081


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