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TPS54302DDCT Datasheet(PDF) 8 Page - Texas Instruments

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Part # TPS54302DDCT
Description  TPS54302 4.5-V to 28-V Input, 3-A Output, EMI Friendly Synchronous Step-Down Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54302DDCT Datasheet(HTML) 8 Page - Texas Instruments

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background image
BOOT
SW
VIN
EN
-
+
+
LS MOSFET
Current Limit
Oscillator
Maximum
Clamp
Overload
Recovery
Soft Start
Voltage
Reference
Slope
Compensation
HS MOSFET
Current
Comparator
Minimum Clamp
Pulse Skip
Power Stage
And
Dead time
Control
Logic
Boot UVLO
Boot Charge
UVLO
Thermal
Hiccup
Shutdown
Logic
ERROR AMPLIFIER
Regulator
VIN
-
+
OV comparator
0.596V
Current
Sense
Current
Sense
FB
GND
Hiccup
Shutdown
Hiccup
Shutdown
EN Compatator
Ip
Ih
20kohm
2.04nF
2pF
Copyright © 2016, Texas Instruments Incorporated
8
TPS54302
SLVSDG6A – MAY 2016 – REVISED MAY 2016
www.ti.com
Product Folder Links: TPS54302
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
7 Detailed Description
7.1 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. The optimized internal compensation network minimizes the
external component counts and simplifies the control loop design.
The TPS54302’s switching frequency is fixed to 400 kHz.
The TPS54302 starts switching at VIN equal to 4.5 V. The operating current is 45
μA typically when not switching
and under no load. When the device is disabled, the supply current is 2 µA typically.
The integrated 85-m
Ω high-side MOSFET and 40-mΩ low-side MOSFET allow for high efficiency power supply
designs with continuous output currents up to 3 A.
The TPS54302 reduces the external component count by integrating the boot recharge diode. The bias voltage
for the integrated high-side MOSFET is supplied by an external capacitor on the BOOT to PH pins. The boot
capacitor voltage is monitored by an UVLO circuit and will turn the high-side MOSFET off when the voltage falls
below a preset threshold of 2.1 V typically.
The device minimizes excessive output overvoltage transients by taking advantage of the overvoltage
comparator. When the regulated output voltage is greater than 108% of the nominal voltage, the overvoltage
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 TPS54302 device has internal 5-ms soft-start time to minimize inrush currents.
7.2 Functional Block Diagram


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