TEXAS INSTRUMENTS TPS2045, TPS2055 Technical data

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TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

features

D

135-mΩ -Maximum (5-V Input) High-Side
MOSFET Switch

D

250 mA Continuous Current

D

Short-Circuit and Thermal Protection With
Overcurrent Logic Output

D

Operating Range . . . 2.7-V to 5.5-V

D

Logic-Level Enable Input

D

2.5-ms Typical Rise Time

D

Undervoltage Lockout

D

10 µA Maximum Standby Supply Current

D

Bidirectional Switch

D

Available in 8-pin SOIC and PDIP Packages

D

Ambient Temperature Range, –40°C to 85°C

D

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

typical applications

D

Notebook, Desktop and Palmtop PCs

D

Monitors, Keyboards, Scanners, and
Printers

D

Digital Cameras, Phones, and PBXs

D

Hot-Insertion Applications

TPS2045

D OR P PACKAGE

(TOP VIEW)

GND

IN
IN

EN

1
2
3
4

OUT

8

OUT

7

OUT

6
5

OC

GND

IN
IN

EN

TPS2055

D OR P PACKAGE

(TOP VIEW)

1
2
3
4

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.

OUT

8

OUT

7

OUT

6
5

OC

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

T

A

–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

†

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.

ENABLE

LOAD CURRENT

(A)

TYPICAL SHORT-CIRCUIT

CURRENT LIMIT AT 25°C

(A)

PACKAGED DEVICES

SOIC

(D)

†

PDIP

(P)

This document contains information on products in more than one phase
of development. The status of each device is indicated on the page(s)
specifying its electrical characteristics.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1999, Texas Instruments Incorporated

1

TPS2045, TPS2055

I/O

DESCRIPTION

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

TPS2045 functional block diagram

Power Switch

IN

Charge

Pump

CS

†

OUT

EN

GND

†

Current Sense

Driver

UVLO

Thermal

Sense

Current

Limit

Terminal Functions

TERMINAL

NO.

NAME

EN 4 – I Enable input. Logic low turns on power switch.
EN – 4 I Enable input. Logic high turns on power switch.
GND 1 1 I Ground
IN 2, 3 2, 3 I Input voltage
OC 5 5 O Over current. Logic output active low
OUT 6, 7, 8 6, 7, 8 O Power-switch output

D OR P

TPS2045 TPS2055

OC

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

detailed description

power switch

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

The power switch is an N-channel MOSFET with a maximum on-state resistance of 135 mΩ (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. T o 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
encountered. The output will remain asserted until the overcurrent or overtemperature condition is removed.

current sense

open-drain output is asserted (active low) when an overcurrent or overtemperature condition is

I(IN)

= 5 V).

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

UNIT

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

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

Input voltage range, V
Output voltage range, V
Input voltage range, V
Continuous output current, I

Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating virtual junction temperature range, T
Storage temperature range, T

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. . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” 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 “recommended operating conditions” 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.

PACKAGE

D 725 mW 5.8 mW/°C 464 mW 377 mW
P 1175 mW 9.4 mW/°C 752 mW 611 mW

(see Note 1) –0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I(IN)

O(OUT)

I(EN)

(see Note 1) –0.3 V to V

or V

I(EN)

O(OUT)

J

stg

Machine model 0.2 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DISSIPATION RATING TABLE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

+ 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I(IN)

–0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

internally limited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

recommended operating conditions

TPS2045 TPS2055

MIN MAX MIN MAX

Input voltage, V
Input voltage, V
Continuous output current, I
Operating virtual junction temperature, T

I(IN)
I(EN

or V

)

I(EN)

O(OUT)

J

2.7 5.5 2.7 5.5 V
0 5.5 0 5.5 V
0 250 0 250 mA

–40 125 –40 125 °C

†

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER

TEST CONDITIONS

†

UNIT

r

trRise time, output

ms

tfFall time, output

ms

PARAMETER

TEST CONDITIONS

UNIT

VILLow-level input voltage

IIInput current

A

PARAMETER

TEST CONDITIONS

†

UNIT

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

electrical characteristics over recommended operating junction temperature range, V

= rated current, V

I

O

I(EN)

= 0 V, V

= Hi (unless otherwise noted)

I(EN)

I(IN)

= 5.5 V,

power switch

TPS2045 TPS2055

MIN TYP MAX MIN TYP MAX

V

= 5 V,

I(IN)

IO = 0.25 A

Static drain-source on-state
resistance, 5-V operation

DS(on)

Static drain-source on-state
resistance, 3.3-V operation

p

p

†

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

V

= 5 V,

I(IN)

IO = 0.25 A
V

= 5 V,

I(IN)

IO = 0.25 A
V

= 3.3 V,

I(IN)

IO = 0.25 A
V

= 3.3 V,

I(IN)

IO = 0.25 A
V

= 3.3 V,

I(IN)

IO = 0.25 A
V

= 5.5 V,

I(IN)

CL = 1 µF,
V

= 2.7 V,

I(IN)

CL = 1 µF,
V

= 5.5 V,

I(IN)

CL = 1 µF,
V

= 2.7 V,

I(IN)

CL = 1 µF,

TJ = 25°C,

TJ = 85°C,

TJ = 125°C,

TJ = 25°C,

TJ = 85°C,

TJ = 125°C,

TJ = 25°C,
RL = 20 Ω

TJ = 25°C,
RL = 20 Ω

TJ = 25°C,
RL = 20 Ω

TJ = 25°C,
RL = 20 Ω

80 95 80 95

90 120 90 120

100 135 100 135

85 105 85 105

100 135 100 135

115 150 115 150

2.5 2.5

3 3

4.4 4.4

2.5 2.5

mΩ

enable input EN or EN

TPS2045 TPS2055

MIN TYP MAX MIN TYP MAX

V

High-level input voltage 2.7 V ≤ V

IH

p

p

t

Turnon time CL = 100 µF, RL = 20 Ω 20 20 ms

on

t

Turnoff time CL = 100 µF, RL = 20 Ω 40 40

off

TPS2045 V
TPS2055 V

4.5 V ≤ V

2.7 V ≤ V
I(EN)

I(EN

≤ 5.5 V 2 2 V

I(IN)

≤ 5.5 V 0.8 0.8 V

I(IN)

≤ 4.5 V 0.4 0.4

I(IN)

= 0 V or V
= V

)

I(IN)

I(EN)

or V

= V

I(EN)

I(IN)

= 0 V

–0.5 0.5

–0.5 0.5

µ

current limit

TPS2045 TPS2055

MIN TYP MAX MIN TYP MAX

V

= 5 V, OUT connected to GND,

I

Short-circuit output current

OS

†

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

I(IN)

Device enabled into short circuit

0.345 0.44 0.525 0.345 0.44 0.525 A

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TPS2045, TPS2055

PARAMETER

TEST CONDITIONS

UNIT

Su ly

TPS2045

,

A

V

V

TPS2055

Su ly

V

V

TPS2045

,

A

V

V

TPS2055

g

d

A

leak

g

T

25°C

A

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

electrical characteristics over recommended operating junction temperature range, V

= rated current, V

I

O

I(EN)

= 0 V, V

= Hi (unless otherwise noted) (continued)

I(EN)

I(IN)

= 5.5 V,

supply current

TPS2045 TPS2055

MIN TYP MAX MIN TYP MAX

pp
current,
low-level
output

pp
current,
high-level
output

Leakage
current

Reverse

age

current

No Load
on OUT

No Load
on OUT

OUT
connecte
to ground

IN = high
impedance

V

= V

I(EN)

= 0

I(EN)

= 0

I(EN)

=

I(EN)

V

= V

I(EN)

V

= 0 V –40°C ≤ TJ ≤ 125°C TPS2055 100

I(EN)

V

= 0 V

I(EN

)

V

= Hi

I(EN)

TJ = 25°C

I(IN)

–40°C ≤ TJ ≤ 125°C
TJ = 25°C
–40°C ≤ TJ ≤ 125°C
TJ = 25°C
–40°C ≤ TJ ≤ 125°C
TJ = 25°C

I(IN)

–40°C ≤ TJ ≤ 125°C
–40°C ≤ TJ ≤ 125°C TPS2045 100

I(IN)

°

=

J

TPS2045 0.3
TPS2055 0.3

0.015 1
10

0.015 1
10

80 100

100

80 100

100

undervoltage lockout

TPS2045 TPS2055

MIN TYP MAX MIN TYP MAX

Low-level input voltage 2 2.5 2 2.5 V
Hysteresis TJ = 25°C 100 100 mV

µ

µ

µ

µ

overcurrent OC

Sink current
Output low voltage IO = 5 V, V
Off-state current

†

Specified by design, not production tested.

†

†

VO = 5 V 10 10 mA

VO = 5 V, VO = 3.3 V 1 1 µA

OL(OC)

TPS2045 TPS2055

MIN TYP MAX MIN TYP MAX

0.5 0.5 V

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS2045, TPS2055

CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS182 – APRIL 1999

PARAMETER MEASUREMENT INFORMATION

OUT

V

I(EN)

(5 V/div)

V

I(EN)

V

O(OUT)

t

RL CL

V

O(OUT)

TEST CIRCUIT

50%

t

on

50%

90%

10%

V

I(EN)

t

off

V

O(OUT)

VOLTAGE WA VEFORMS

r

90%

90%

10%

50%

t

on

10%

50%

90%

10%

t

f

t

off

Figure 1. Test Circuit and Voltage Waveforms

V

I(EN)

(5 V/div)

V

O(OUT)

(2 V/div)

V

= 5 V

I(IN)

TA = 25°C
CL = 0.1 µF

0123456

t – Time – ms

78910

Figure 2. Turnon Delay and Rise Time

with 0.1-µF Load

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

V

O(OUT)

(2 V/div)

V

= 5 V

I(IN)

TA = 25°C
CL = 0.1 µF

0 1000 2000 3000

t – Time – ms

4000 5000

Figure 3. Turnoff Delay and Fall Time

with 0.1-µF Load

7