TPS546B24A

TPS546B24A 2.95-V to 18-V, 20-A, Up to 4× Stackable, PMBus® Buck Converter

Manufacturer

Texas Instruments

Overview

Part: Texas Instruments TPS546B24A

Type: Synchronous Buck Converter

Key Specs:

Input Voltage (PVIN): 2.95-V to 18-V
Output Current: 20-A
Output Voltage Range: 0.25-V to 5.5-V
Switching Frequency: 225 kHz to 1.5 MHz
Integrated MOSFETs: 5.5-mΩ/1.8-mΩ
Operating Junction Temperature: -40°C to +150°C

Features:

Split rail support
Average current mode control with selectable internal compensation
2×, 3×, 4× stackable with current sharing up to 80 A
Extensive PMBus command set with telemetry for VOUT, IOUT and internal die temperature
Differential remote sensing with internal FB divider for < 1% VOUT error
AVS and margining capabilities through PMBus
MSEL pins pin programming PMBus defaults
Frequency sync in/sync out
Supports prebiased output
Supports strongly coupled inductor

Applications:

Data center switches, rack servers
Active antenna system, remote radio and baseband unit
Automated test equipment, CT, PET, and MRI
ASIC, SoC, FPGA, DSP core, and I/O voltage

Package:

LQFN-CLIP (40): 7.00 mm × 5.00 mm × 1.5 mm

Features

Split rail support: 2.95-V to 18-V PVIN; 2.95-V to 18-V AVIN (4-VIN VDD5 for switching)
Integrated 5.5-mΩ/1.8-mΩ MOSFETs
Average current mode control with selectable internal compensation
2×, 3×, 4× stackable with current sharing up to 80 A, supporting a single address per output
Selectable 0.5-V to 5.5-V output via pin strap or 0.25-V to 5.5-V using PMBus VOUT_COMMAND
Extensive PMBus command set with telemetry for VOUT, IOUT and internal die temperature
Differential remote sensing with internal FB divider for < 1% VOUT error –40°C to +150°C T^J
AVS and margining capabilities through PMBus
MSEL pins pin programming PMBus defaults
12 Selectable switching frequencies from 225 kHz to 1.5 MHz (8 pin-strap options)
Frequency sync in/sync out
Supports prebiased output
Supports strongly coupled inductor
7-mm × 5-mm × 1.5-mm, 40-pin QFN, pitch = 0.5 mm
Create a Custom Design Using the TPS546B24A With WEBENCH® Power Designer

Applications

Data center switches, rack servers
Active antenna system, remote radio and baseband unit
Automated test equipment, CT, PET, and MRI
ASIC, SoC, FPGA, DSP core, and I/O voltage

Pin Configuration

Figure 5-1. 40-Pin LQFN-CLIP With Exposed Thermal Pad RVF Package (Top View)

Electrical Characteristics

TJ = –40°C to 150°C, VPVIN = VAVIN= 12 V, fSW = 550 kHz; zero power dissipation (unless otherwise noted)

	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
INPUT SUPPLY
VAVIN	Input supply voltage range		2.95		16	V
VPVIN	Power stage voltage range		2.95		16	V
IAVIN	Input operating current	Converter not switching		12.5	17	mA
AVIN UVLO
VAVINuvlo

TPS546B24A SLUSE15A – FEBRUARY 2020 – REVISED SEPTEMBER 2020 www.ti.com

TJ	= –40°C to 150°C, VPVIN = VAVIN= 12 V, fSW = 550 kHz; zero power dissipation (unless otherwise noted)
	PARAMETER
----------------------	--------------------------------------------------------
VIRNG(VOSNS)	VOSNS input range for regulation accuracy (1)
	REFERENCE VOLTAGE AND ERROR AMPLIFIER
VREF
	Reference voltage(1)





VOUT(ACC)	Output voltage accuracy




	Progrmmable error amplifier transonductance
GmEA	Resolution(1)
	Unloaded Bandwidth(1)
RpEA	Programmable parallel resistor range
	Resolution(1)
CintEA	Programmable integrator capacitor range
	Resolution(1)
CpEA	Programmable parallel capacitor range
	Resolution(1)
CURRENT GM AMPLIFIER
	Progrmmable current error amplifier transonductance
GmBUF	Resolution(1)
	Unloaded bandwidth(1)
RpBUF	Programmable parallel resistor range
	Resolution(1)
RintBUF	Programmable integrator resistor range(1)
	Resolution(1)
CintBUF	Programmable integrator capacitor range
	Resolution(1)
CpBUF	Programmable parallel capacitor range
	Resolution(1)
OSCILLATOR
	Adjustment range(2)
fSW	Switching frequency(2)
SYNCHRONIZATION

TJ = –40°C to 150°C, VPVIN = VAVIN= 12 V, fSW = 550 kHz; zero power dissipation (unless otherwise noted)

	PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
VIH(sync)	High-level input voltage			1.35
VIL(sync)	Low-level input voltage					0.8	V
tpw(sync)	Sync input minimum pulse width	fsw = 225 kHz to 1500 kHz				200	ns
ΔfSYNC	SYNC pin frequency range from FREQUENCY_SWITCH frequency(1)			–20		20	%
VOH(sync)	Sync output high voltage	100-μA load		VDD5 – 0.85V		VDD5	V
VOL(sync)	Sync output low voltage	2.4-mA load				0.4	V
tPLL	PLL lock time	605 kHz(1)	Fsw = 550 kHz, SYNC clock frequency 495 kHz -			65	μs
PhaseErr	Phase interleaving error(5)	fsw < 1.1 MHz fsw ≥1.1 MHz				9 23	Degre e ns
RESET
VIH(reset)	High-level input voltage(1)			1.35
VIL(reset)	Low-level input voltage					0.8	V
tpw(reset)	Minimum RESET_B pulse width					200	ns
Rpullup(reset)	Internal pull-up resistance	VRESET = 0.8V	RESET# = 1	25	34	55	kΩ
Vpullup(reset)	Internal Pull-up Voltage	IRESET = 10 μA	RESET# = 1			VDD5 - 0.5	V
VDD5 REGULATOR
	Regulator output voltage	Default, IVDD5 = 10 mA		4.5	4.7	4.9	V
VVDD5	Programmable range(1) Resolution			3.9	200	5.3	V mV
VVDD5(do)	Regulator dropout voltage		VAVIN – VVDD5, VAVIN = 4.5 V, IVDD5 = 25 mA		130	285	mV
VVDD5ON(IF)	Enable voltage on VDD5 for pin-strapping				2.62	2.85	V
VVDD5OFF(IF)	Disable voltage on VDD5 for pin-strapping			2.25	2.48		V
VVDD5ON(SW)	Switching enable voltage upon VDD5					4.05	V
VVDD5OFF(SW)	Switching disable voltage upon VDD5			3.10			V
VVDD5UV(hyst)	Regulator UVLO voltage hysteresis			400			mV
BOOTSTRAP
VBOOT(drop)	Bootstrap voltage drop	IBOOT = 20 mA, VDD5 = 4.5 V				225	mV
BP1V5 REGULATOR
VBP1V5	1.5-V regulator output voltage VAVIN ≥ 4.5 V, IBP1V5 = 5 mA			1.42	1.5	1.58	V
IBP1V5SC	1.5-V regulator short-circuit current(1)			30			mA
PWM
tON(min)	Minimum controllable pulse width(1)					20	ns
tOFF(min)	PWM Minimum off-time(1)				400	500	ns
SOFT START
tON_RISE	Soft-start time	Factory default setting			3		ms

Upper limit on the time to power up the output

tON_MAX_FLT_LT

tON_DELAY Turn-on delay

tOFF_FALL
tOFF_DELAY
VPVINOVF
VPVINUVW
POWER STAGE
RHS
RLS
Rswpd
Vwkdr(on)
Vwkdr(off)

Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

		MIN	MAX	UNIT
Input voltage	PVIN	–0.3	18	V
Input voltage	PVIN, < 2-ms transient	–0.3	19	V
	PVIN – SW (PVIN to SW differential)	–0.3	24
Input voltage	PVIN – SW (PVIN to SW differential, < 10-ns transient because of SW ringing)	–5	24	V
	AVIN	–0.3	20	V
	BOOT	–0.3	35	V
Input voltage	BOOT – SW (BOOT to SW differential)	–0.3	5.5	V
	EN/UVLO, VOSNS, SYNC, VSEL, MSEL1, MSEL2, ADRSEL	–0.3	5.5	V
	VSHARE, GOSNS/SLAVE	–0.3	1.98	V
	PMB_CLK, PMB_DATA, BCX_CLK, BCX_DAT	–0.3	5.5	V
Output voltage	SW	–1	24	V
Output voltage	SW < 10-ns transient	–5	24	V
Output voltage	VDD5, SMB_ALRT, PGD/RST_B	–0.3	5.5	V
	BP1V5	–0.3	1.65	V
T_J operating junction temperature		–40	150	°C
T_stg Storage temperature		–55	150	°C

Recommended Operating Conditions

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

		MIN	NOM	MAX	UNIT
VAVIN	Controller input voltage	2.95	12	18	V
VPVIN	Power stage input voltage	2.95	12	18	V
VSW(peak)	Peak Switch Node Voltage with respect to PGND			18	V
TJ	Junction temperature	–40		150	°C

Thermal Information

		TPS546X24A	UNIT
	THERMAL METRIC(1)	PQFN (RVF) 40 PINS
RθJA	Junction-to-ambient thermal resistance JEDEC	25.3	°C/W
RθJA	Junction-to-ambient thermal resistance EVM(2)	12	°C/W
RθJC(top)	Junction-to-case (top) thermal resistance	26.3	°C/W
RθJB	Junction-to-board thermal resistance	8.5	°C/W

TPS546B24A SLUSE15A – FEBRUARY 2020 – REVISED SEPTEMBER 2020

THERMAL METRIC(1)		TPS546X24A	UNIT
		PQFN (RVF) 40 PINS
ψJT	Junction-to-top characterization parameter	2.0	°C/W
ψJB	Junction-to-board characterization parameter	9.3	°C/W
RθJC(bot)	Junction-to-case (bottom) thermal resistance	1.0	°C/W

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

(2) EVM thermal resistance measured on TPS546D24AEVM-2PH. 8-layer, 2-oz Cu per layer evaluation board.

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
TPS546B24ARVFR	Texas Instruments	—
TPS546B24ARVFR.A	Texas Instruments	—
TPS546B24ARVFT	Texas Instruments	—
TPS546B24ATPS546X24X	Texas Instruments	—

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