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TPS54336DDA Datasheet(PDF) 9 Page - Texas Instruments

Part # TPS54336DDA
Description  4.5V to 28V Input, 3A Output, Synchronous SWIFT Step-Down Voltage Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54336DDA Datasheet(HTML) 9 Page - Texas Instruments

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2.000
2.100
2.200
2.300
±50
±25
0
25
50
75
100
125
150
T
J - Junction Temperature (ƒC)
C013
4.0
4.5
5.0
5.5
6.0
4
8
12
16
20
24
28
V
IN - Input Voltage (V)
TJ = -40
S
TJ = 25
S
TJ = 150
S
C014
T
J = -40SC
T
J = 25SC
T
J = 150SC
TPS54335
TPS54336
www.ti.com
SLVSC03B – MAY 2013 – REVISED NOVEMBER 2013
TYPICAL CHARACTERISTICS (continued)
BOOT-PH UVLO THRESHOLD
CURRENT LIMIT THRESHOLD
vs
vs
JUNCTION TEMPERATURE
INPUT VOLTAGE
Figure 13.
Figure 14.
OVERVIEW
The device is a 28-V, 3-A, synchronous step-down (buck) converter with two integrated n-channel MOSFETs. To
improve performance during line and load transients the device implements a constant frequency, peak current
mode control which reduces output capacitance and simplifies external frequency compensation design.
The device has been designed for safe monotonic startup into pre-biased loads. It has a typical default start up
voltage of 4.0 V. The EN pin has an internal pull-up current source that can provide a default condition when the
EN pin is floating for the device to operate. The total operating current for the device is typically 310µA when not
switching and under no load. When the device is disabled, the supply current is less than 5
μA.
The integrated 128m
Ω/84mΩ MOSFETs allow for high efficiency power supply designs with continuous output
currents up to 3 amperes.
The device reduces the external component count by integrating the boot recharge diode. The bias voltage for
the integrated high side MOSFET is supplied by a capacitor between the BOOT and PH pins. The boot capacitor
voltage is monitored by an UVLO circuit and turns off the high side MOSFET when the voltage falls below a
preset threshold. The output voltage can be stepped down to as low as the 0.8 V reference.
The device minimizes excessive output over-voltage transients by taking advantage of the over-voltage power
good comparator. When the regulated output voltage is greater than 106% of the nominal voltage, the over-
voltage comparator is activated, and the high side MOSFET is turned off and masked from turning on until the
output voltage is lower than 104%.
The TPS54335 has wide switching frequency of 50 kHz to 1500 kHz which allows for efficiency and size
optimization when selecting the output filter components. The internal 2ms slow start time is implemented to
minimize inrush currents.
The TPS54336 is fixed at 340kHz. It is able to adjust the slow start time by the SS pin.
Copyright © 2013, Texas Instruments Incorporated
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