TPS54540

Synchronous Buck Converter

The TPS54540 is a synchronous buck converter from Texas Instruments. View the full TPS54540 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

TPS54540 shares its datasheet with TPS54540QDDAQ1, whose page lists every part number it covers.

Official TPS54540 datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

TPS54540 Key Specifications

Parameter	Value
Output Current	5A
Switching Frequency	100kHz ~ 2.5MHz
Function	Step-Down
Grade	Automotive
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature	-40°C ~ 150°C (TJ)
Output Configuration	Positive
Output Type	Adjustable
Package / Case	8-PowerSOIC (0.154", 3.90mm Width)
Packaging	Tube
Qualification	AEC-Q100
Standard Pack Qty	75
Supplier Device Package	8-SO PowerPad
Synchronous Rectifier	No
Topology	Buck, Split Rail
Input Voltage (Max)	42V
Input Voltage (Min)	4.5V
Output Voltage (Max)	41.1V
Output Voltage	0.8V

TPS54540 Overview

Part: TPS54540QDDAQ1 — Texas Instruments

Type: Step-Down (Buck) DC-DC Converter with Integrated High-Side MOSFET

Description: 4.5–42 V input, 5 A step-down converter with a 92 mΩ integrated high-side MOSFET, 100 kHz to 2.5 MHz switching frequency, and 146 μA operating quiescent current.

Operating Conditions:

Supply voltage: VO + VDO to 42 V
Operating temperature: -40 to 150 °C (junction)
Output voltage: 0.8 to 41.1 V
Output current: 0 to 5 A

Absolute Maximum Ratings:

Max supply voltage (VIN): 45 V
Max junction temperature: 150 °C
Storage temperature: -65 to 150 °C
BOOT: 53 V max; SW: 45 V max (-0.6 V min)

Key Specs:

Output current: up to 5 A
High-side MOSFET on-resistance: 92 mΩ
Operating quiescent current: 146 μA (no load, pulse-skip mode)
Shutdown supply current: 2 μA (EN low)
Switching frequency: 100 kHz to 2.5 MHz, synchronizable to an external clock
Internal voltage reference: 0.8 V, 1%
Internal UVLO: 4.3 V, adjustable via the EN pin
Survives load dump pulses up to 45 V per ISO 7637

Features:

Pulse-skipping Eco-mode™ for high efficiency at light loads
Integrated BOOT recharge FET for low dropout at light loads
Adjustable UVLO voltage and hysteresis
Current-mode control with external compensation
Controlled internal output voltage start-up ramp
Cycle-by-cycle current limit, frequency foldback, and thermal shutdown
WEBENCH® Power Designer support

Applications:

Industrial automation and motor control
Vehicle accessories: GPS, entertainment
USB dedicated charging ports and battery chargers
12 V and 24 V industrial, automotive, and communications power systems

Package:

HSOP-8 with PowerPAD™ (4.89 mm x 3.9 mm body)

TPS54540 Features

1 · High Efficiency at Light Loads with Pulse Skipping Eco-mode™
92-m Ω High-Side MOSFET
146 μ A Operating Quiescent Current and 2 μ A Shutdown Current
100 kHz to 2.5 MHz Fixed Switching Frequency
Synchronizes to External Clock
Low Dropout at Light Loads with Integrated BOOT Recharge FET
Adjustable UVLO Voltage and Hysteresis
0.8 V 1% Internal Voltage Reference
8-Terminal HSOP with PowerPAD™ Package
-40°C to 150°C TJ Operating Range
Create a Custom Design using the TPS54540 with the WEBENCH® Power Designer

TPS54540 Applications

Industrial Automation and Motor Control
Vehicle Accessories: GPS, Entertainment
USB Dedicated Charging Ports and Battery Chargers
12 V and 24 V Industrial, Automotive and Communications Power Systems

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TPS54540 Pin Configuration

TPS54540 Electrical Characteristics

TJ = -40°C to 150°C, VIN = 4.5 to 42 V (unless otherwise noted)

PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
SUPPLY VOLTAGE (VIN TERMINAL)
Operating input voltage		4.5		42	V
Internal undervoltage lockout threshold	Rising	4.1	4.3	4.48	V
Internal undervoltage lockout threshold hysteresis			325		mV
Shutdown supply current	EN = 0 V, 25°C, 4.5 V ≤ VIN ≤ 42 V		2.25	4.5
Operating: nonswitching supply current	FB = 0.9 V, T A = 25°C		146	175	μ A
ENABLE AND UVLO (EN TERMINAL)
Enable threshold voltage	No voltage hysteresis, rising and falling Enable threshold +50 mV	1.1	1.2 -4.6	1.3	V
Input current	Enable threshold -50 mV	-0.58	-1.2	-1.8	μ A
Hysteresis current		-2.2	-3.4	-4.5	μ A
VOLTAGE REFERENCE
Voltage reference		0.792	0.8	0.808	V
HIGH-SIDE MOSFET
On-resistance	VIN = 12 V, BOOT-SW = 6 V		92	190	m Ω
ERROR AMPLIFIER
Input current			50		nA
Error amplifier transconductance (g M )	-2 μ A < I COMP < 2 μ A, V COMP = 1 V		350		μ Mhos
Error amplifier transconductance (g M ) during soft-start	-2 μ A < I COMP < 2 μ A, V COMP = 1 V, V FB = 0.4 V		77		μ Mhos
Error amplifier dc gain	V FB = 0.8 V		10,000		V/V
Min unity gain bandwidth			2500		kHz
Error amplifier source/sink	V (COMP) = 1 V, 100 mV overdrive		±30		μ A
COMP to SW current transconductance			17		A/V
CURRENT LIMIT
Current limit threshold	All VIN and temperatures, Open Loop (1)	6.3	7.5	8.8
	All temperatures, VIN = 12 V, Open Loop (1)	6.3	7.5	8.3	A
	VIN = 12 V, T A = 25°C, Open Loop (1)	7.1	7.5	7.9
THERMAL SHUTDOWN
Thermal shutdown			176		°C
Thermal shutdown hysteresis			12		°C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK	TERMINAL)
Switching frequency range using RT mode		100		2500	kHz
f SW Switching frequency	R T = 200 k Ω	450	500	550	kHz
Switching frequency range using CLK mode		160		2300	kHz
RT/CLK high threshold			1.55	2	V
RT/CLK low threshold		0.5	1.2		V

TPS54540 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

		VALUE - MIN	VALUE - MAX	UNIT
Input	VIN	-0.3	45	V
Input	EN	-0.3	8.4	V
Input	BOOT		53	V
Input	FB	-0.3	3	V
Input	COMP	-0.3	3	V
Input	RT/CLK	-0.3	3.6	V
Output	BOOT-SW		8	V
Output	SW	-0.6	45	V
Output	SW, 10-ns Transient	-2	45	V
Operating junction temperature, T J	Operating junction temperature, T J	-40	150	°C
Storage temperature, T STG	Storage temperature, T STG	-65	150	°C

TPS54540 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

		MIN	MAX	UNIT
V IN	Supply input voltage (1)	V O + V DO	42	V
V O	Output voltage	0.8	41.1	V
I O	Output current	0	5	A
T J	Junction Temperature	-40	150	°C

TPS54540 Thermal Information

THERMAL METRIC (1)(2)		TPS54540 DDA (8 PINS)	UNIT
θ JA	Junction-to-ambient thermal resistance (standard board)	42.0	°C/W
ψ JT	Junction-to-top characterization parameter	5.9	°C/W
ψ JB	Junction-to-board characterization parameter	23.4	°C/W
θ JCtop	Junction-to-case(top) thermal resistance	45.8	°C/W
θ JCbot	Junction-to-case(bottom) thermal resistance	3.6	°C/W
θ JB	Junction-to-board thermal resistance	23.4	v

TPS54540 Typical Application

The TPS54540 is a 42 V, 5 A, step down regulator with an integrated high side MOSFET. Idea applications are: 12 V and 24 V Industrial, Automotive and Communications Power Systems.

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
TPS54540-Q1	Texas Instruments	HSOP-8
TPS54540DDA	Texas Instruments
TPS54540DDA.B	Texas Instruments	—
TPS54540DDAR	Texas Instruments	HSOP-8
TPS54540DDAR.B	Texas Instruments	—
TPS54540QDDAQ1	Texas Instruments	8-PowerSOIC (0.154", 3.90mm Width)

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