Texas Instruments TPS2045P, TPS2045DR, TPS2045D, TPS2055P, TPS2055DR Datasheet

TPS2045, TPS2055 CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 ± APRIL 1999

features

D135-mΩ -Maximum (5-V Input) High-Side

MOSFET Switch

D250 mA Continuous Current

DShort-Circuit and Thermal Protection With Overcurrent Logic Output

DOperating Range . . . 2.7-V to 5.5-V

DLogic-Level Enable Input

D2.5-ms Typical Rise Time

DUndervoltage Lockout

D10 µA Maximum Standby Supply Current

DBidirectional Switch

DAvailable in 8-pin SOIC and PDIP Packages

DAmbient Temperature Range, ±40°C to 85°C

D2-kV Human-Body-Model, 200-V Machine-Model ESD Protection

typical applications

DNotebook, Desktop and Palmtop PCs

DMonitors, Keyboards, Scanners, and Printers

DDigital Cameras, Phones, and PBXs

DHot-Insertion Applications

				TPS2045								TPS2055
	D OR P PACKAGE									D OR P PACKAGE
				(TOP VIEW)								(TOP VIEW)
GND								OUT		GND					OUT
				1	8							1	8
	IN			2	7			OUT		IN		2	7		OUT
	IN			3	6			OUT		IN		3	6		OUT
										EN
	EN			4	5			OC				4	5			OC

description

The TPS2045 and TPS2055 power-distribution switches are intended for applications where heavy capacitive loads and short circuits are likely. Each of these 135-mΩ N-channel MOSFET high-side power switches is controlled by a logic enable compatible with 5-V and 3-V logic. Gate drive is provided by an internal charge pump that controls the power-switch rise times and fall times to minimize current surges during switching. The charge pump requires no external components and allows operation from supplies as low as 2.7 V.

When the output load exceeds the current-limit threshold or a short is present, the TPS2045 and TPS2055 limit the output current to a safe level by switching into a constant-current mode, pulling the overcurrent (OC) logic output low. When continuous heavy overloads and short circuits increase the power dissipation in the switch, causing the junction temperature to rise, a thermal protection circuit shuts off the switch in overcurrent to prevent damage. Recovery from a thermal shutdown is automatic once the device has cooled sufficiently. Internal circuitry ensures the switch remains off until valid input voltage is present.

The TPS2045 and TPS2055 are designed to limit at 0.44-A load. These power-distribution switches, available in 8-pin small-outline integrated circuit (SOIC) and 8-pin plastic dual-in-line packages (PDIP), operate over an ambient temperature range of ±40°C to 85°C.

AVAILABLE OPTIONS

			RECOMMENDED	TYPICAL SHORT-CIRCUIT	PACKAGED DEVICES
			MAXIMUM CONTINUOUS
	TA	ENABLE		CURRENT LIMIT AT 25°C	SOIC	PDIP
			LOAD CURRENT
			(A)	(A)	(D)²	(P)
	±40°C to 85°C	Active low	0.25	0.44	TPS2045D	TPS2045P
	±40°C to 85°C	Active high	0.25	0.44	TPS2055D	TPS2055P

² The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2045DR)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

This document contains information on products in more than one phase	Copyright 1999, Texas Instruments Incorporated
of development. The status of each device is indicated on the page(s)
specifying its electrical characteristics.
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265	1

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 ± APRIL 1999

TPS2045 functional block diagram

	Power Switch
		²
IN		CS	OUT
	Charge
	Pump
EN	Driver	Current
		Limit
			OC
	UVLO
	Thermal
GND	Sense

² Current Sense

								Terminal Functions
				TERMINAL
				NO.			I/O	DESCRIPTION
	NAME
				D OR P
				TPS2045		TPS2055
				4		±	I	Enable input. Logic low turns on power switch.
	EN
	EN			±		4	I	Enable input. Logic high turns on power switch.
	GND			1		1	I	Ground
	IN			2, 3		2, 3	I	Input voltage
				5		5	O	Over current. Logic output active low
	OC
	OUT			6, 7, 8		6, 7, 8	O	Power-switch output

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 ± APRIL 1999

detailed description

power switch

The power switch is an N-channel MOSFET with a maximum on-state resistance of 135 mΩ (VI(IN) = 5 V). Configured as a high-side switch, the power switch prevents current flow from OUT to IN and IN to OUT when

disabled. The power switch can supply a minimum of 250 mA per switch.

charge pump

An internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the source. The charge pump operates from input voltages as low as 2.7 V and requires very little supply current.

driver

The driver controls the gate voltage of the power switch. To limit large current surges and reduce the associated electromagnetic interference (EMI) produced, the driver incorporates circuitry that controls the rise times and fall times of the output voltage. The rise and fall times are typically in the 2-ms to 4-ms range.

enable (EN or EN)

The logic enable disables the power switch and the bias for the charge pump, driver, and other circuitry to reduce the supply current to less than 10 µA when a logic high is present on EN (TPS2045) or a logic low is present on EN (TPS2055). A logic zero input on EN or a logic high on EN restores bias to the drive and control circuits and turns the power on. The enable input is compatible with both TTL and CMOS logic levels.

overcurrent (OC)

The OC open-drain output is asserted (active low) when an overcurrent or overtemperature condition is encountered. The output will remain asserted until the overcurrent or overtemperature condition is removed.

current sense

A sense FET monitors the current supplied to the load. The sense FET measures current more efficiently than conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry sends a control signal to the driver. The driver in turn reduces the gate voltage and drives the power FET into its saturation region, which switches the output into a constant current mode and holds the current constant while varying the voltage on the load.

thermal sense

An internal thermal-sense circuit shuts off the power switch when the junction temperature rises to approximately 140°C. Hysteresis is built into the thermal sense circuit. After the device has cooled approximately 20°C, the switch turns back on. The switch continues to cycle off and on until the fault is removed.

undervoltage lockout

A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2 V, a control signal turns off the power switch.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

3

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 ± APRIL 1999

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)²

Input voltage range, VI(IN) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3 V to 6 V Output voltage range, VO(OUT) (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3 V to VI(IN) + 0.3 V Input voltage range, VI(EN) or VI(EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3 V to 6 V Continuous output current, IO(OUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . internally limited Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table

Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±40°C to 125°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±65°C to 150°C Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . 260°C

Electrostatic discharge (ESD) protection: Human body model MIL-STD-883C . . . . . . . . . . . . . . . . . . . . . 2 kV Machine model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 kV

²Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltages are with respect to GND.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

DERATING FACTOR

TA = 70°C

TA = 85°C

POWER RATING

ABOVE TA = 25°C

POWER RATING POWER RATING

D

725 mW

5.8 mW/°C

464 mW

377 mW

P

1175 mW

9.4 mW/°C

752 mW

611 mW

recommended operating conditions

TPS2045

TPS2055

UNIT

MIN

MAX

MIN

MAX

Input voltage, VI(IN)

2.7

5.5

2.7

5.5

V

or VI(EN)

0

5.5

0

5.5

V

Input voltage, VI(EN)

Continuous output current, IO(OUT)

0

250

0

250

mA

Operating virtual junction temperature, TJ

±40

125

±40

125

°C

4	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 ± APRIL 1999

electrical characteristics over recommended operating junction temperature range, VI(IN)= 5.5 V, IO = rated current, VI(EN)= 0 V, VI(EN) = Hi (unless otherwise noted)

power switch

	PARAMETER	TEST CONDITIONS²		TPS2045		TPS2055		UNIT
				MIN TYP	MAX	MIN TYP	MAX
		VI(IN) = 5 V,	TJ = 25°C,	80	95	80	95
		IO = 0.25 A
	Static drain-source on-state	VI(IN) = 5 V,	TJ = 85°C,	90	120	90	120
	resistance, 5-V operation	IO = 0.25 A
		VI(IN) = 5 V,	TJ = 125°C,	100	135	100	135	mΩ
		IO = 0.25 A
rDS(on)
		VI(IN) = 3.3 V,	TJ = 25°C,	85	105	85	105
		IO = 0.25 A
	Static drain-source on-state	VI(IN) = 3.3 V,	TJ = 85°C,	100	135	100	135
	resistance, 3.3-V operation	IO = 0.25 A
		VI(IN) = 3.3 V,	TJ = 125°C,	115	150	115	150
		IO = 0.25 A
		VI(IN) = 5.5 V,	TJ = 25°C,	2.5		2.5
		CL = 1 µF,	RL = 20 Ω
tr	Rise time, output							ms
		VI(IN) = 2.7 V,	TJ = 25°C,	3		3
		CL = 1 µF,	RL = 20 Ω
		VI(IN) = 5.5 V,	TJ = 25°C,	4.4		4.4
		CL = 1 µF,	RL = 20 Ω
tf	Fall time, output							ms
		VI(IN) = 2.7 V,	TJ = 25°C,	2.5		2.5
		CL = 1 µF,	RL = 20 Ω

² Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately.

enable input EN or EN

	PARAMETER				TEST CONDITIONS		TPS2045			TPS2055	UNIT
							MIN TYP	MAX	MIN	TYP MAX
VIH	High-level input voltage		2.7 V ≤ VI(IN) ≤ 5.5 V				2		2		V
VIL	Low-level input voltage		4.5 V ≤ VI(IN) ≤ 5.5 V					0.8		0.8	V
			2.7 V ≤ VI(IN) ≤ 4.5 V					0.4		0.4
II	Input current	TPS2045	VI(EN)		= 0 V or VI(EN) = VI(IN)		±0.5	0.5			µA
		TPS2055	VI(EN) = VI(IN) or VI(EN) = 0 V						±0.5	0.5
ton	Turnon time		CL = 100 µF,			RL = 20 Ω		20		20	ms
toff	Turnoff time		CL = 100 µF,			RL = 20 Ω		40		40

current limit

	PARAMETER	TEST CONDITIONS²		TPS2045			TPS2055		UNIT
			MIN	TYP	MAX	MIN	TYP	MAX
	IOS Short-circuit output current	VI(IN) = 5 V, OUT connected to GND,	0.345	0.44	0.525	0.345	0.44	0.525	A
		Device enabled into short circuit

² Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

5

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 ± APRIL 1999

electrical characteristics over recommended operating junction temperature range, VI(IN)= 5.5 V, IO = rated current, VI(EN) = 0 V, VI(EN) = Hi (unless otherwise noted) (continued)

supply current

PARAMETER

TEST CONDITIONS

TPS2045

TPS2055

UNIT

MIN

TYP

MAX

MIN TYP

MAX

Supply

TJ = 25°C

TPS2045

0.015

1

VI(EN)

= VI(IN)

No Load

°

≤

TJ

≤

°

10

current,

±40 C

125 C

A

low-level

on OUT

°

0.015

1

output

VI(EN)

= 0 V

TJ = 25 C

TPS2055

±40°C

≤ TJ

≤

125°C

10

Supply

TJ = 25°C

TPS2045

80

100

VI(EN)

= 0 V

No Load

±40°C

≤ TJ

≤

125°C

100

current,

A

high-level

on OUT

°

80

100

output

VI(EN)

= VI(IN)

TJ = 25 C

TPS2055

±40°C

≤ TJ

≤

125°C

100

OUT

±40°C ≤ TJ

≤ 125°C

Leakage

VI(EN)

= VI(IN)

TPS2045

100

A

current

connected

VI(EN) = 0 V

±40°C ≤ TJ

≤ 125°C

TPS2055

100

to ground

Reverse

IN = high

VI(EN)

= 0 V

TJ = 25°C

TPS2045

0.3

A

leakage

impedance

VI(EN) = Hi

TPS2055

0.3

current

undervoltage lockout

		PARAMETER		TEST CONDITIONS		TPS2045			TPS2055		UNIT
					MIN	TYP	MAX	MIN	TYP	MAX
	Low-level input voltage				2		2.5	2		2.5	V
	Hysteresis			TJ = 25°C		100			100		mV

overcurrent OC

	PARAMETER	TEST CONDITIONS				TPS2045		TPS2055	UNIT
						MIN TYP	MAX	MIN TYP MAX
	Sink current²	VO = 5 V					10	10	mA
	Output low voltage	IO = 5 V,
			VOL(OC)				0.5	0.5	V
	Off-state current²	VO = 5 V,	VO = 3.3 V				1	1	A
	² Specified by design, not production tested.

6	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 ± APRIL 1999

PARAMETER MEASUREMENT INFORMATION

	OUT
		RL	CL	tr			tf
				VO(OUT)		90%	90%
					10%		10%
	TEST CIRCUIT
VI(EN)	50%	50%		VI(EN)	50%	50%
	ton		toff	ton			toff
VO(OUT)		90%		VO(OUT)		90%
			10%				10%

VOLTAGE WAVEFORMS

Figure 1. Test Circuit and Voltage Waveforms

VI(EN)

(5 V/div)

VO(OUT)

(2 V/div)

VI(EN)

(5 V/div)

								VI(IN) = 5 V					V
									°
								TA = 25 C					O(OUT)
								CL = 0.1 F					(2 V/div)
													0
0		1	2	3	4	5	6	7	8	9	10
					t ± Time ± ms

VI(IN) = 5	V
TA = 25°C
CL = 0.1 F
1000	2000	3000	4000	5000
	t ± Time ± ms

Figure 2. Turnon Delay and Rise Time

with 0.1- F Load

Figure 3. Turnoff Delay and Fall Time

with 0.1- F Load

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