TPS54540-Q1

Synchronous Buck Converter

The TPS54540-Q1 is a synchronous buck converter from Texas Instruments. View the full TPS54540-Q1 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

TPS54540-Q1 shares its datasheet with TPS54540QDDAQ1, whose page lists every part number it covers.

Official TPS54540-Q1 datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

TPS54540-Q1 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-Q1 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-Q1 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-Q1 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-Q1 Pin Configuration

TPS54540-Q1 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-Q1 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-Q1 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-Q1 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-Q1 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	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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