TEXAS INSTRUMENTS TPS2046, TPS2056 Technical data

MAXIMUM CONTINUOUS

SHORT-CIRCUIT CURRENT

TPS2046, TPS2056

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – APRIL 1999

features

D

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

D

250 mA Continuous Current per Channel

D

Independent 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

TPS2046

D OR P PACKAGE

(TOP VIEW)

GND

IN
EN1
EN2

1
2
3
4

8
7
6
5

OC1
OUT1
OUT2
OC2

GND

EN1
EN2

TPS2056

D OR P PACKAGE

(TOP VIEW)

1

IN

2
3
4

description

The TPS2046 and TPS2056 dual power-distribution switches are intended for applications where heavy
capacitive loads and short circuits are likely. These devices incorporate in single packages two 135-mΩ
N-channel MOSFET high-side power switches for power-distribution systems that require multiple power
switches. Each switch 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.

8
7
6
5

OC1
OUT1
OUT2
OC2

When the output load exceeds the current-limit threshold or a short is present, the TPS2046 and TPS2056 limit
the output current to a safe level by switching into a constant-current mode, pulling the overcurrent (OCx
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 TPS2046 and TPS2056 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

T

A

–40°C to 85°C Active low 0.25 0.44 TPS2046D TPS2046P
–40°C to 85°C Active high 0.25 0.44 TPS2056D TPS2056P

†

The D package is available taped and reeled. Add an R suffix to device type (e.g., TPS2046DR)

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.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

ENABLE

RECOMMENDED

LOAD CURRENT

(A)

TYPICAL

LIMIT AT 25°C

(A)

PACKAGED DEVICES

SOIC

†

(D)

Copyright  1999, Texas Instruments Incorporated

PDIP

(P)

) logic

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

TPS2046, TPS2056

I/O

DESCRIPTION

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – APRIL 1999

TPS2046 functional block diagram

OC1

†

Current sense

GND

EN1

EN2

Thermal

Sense

Driver

Charge

Pump

UVLO

Power Switch

IN

Charge

Pump

Driver

Thermal

Sense

Current

Limit

CS

CS

Current

Limit

†

OUT1

†

OUT2

OC2

Terminal Functions

TERMINAL

NO.

NAME

EN1 3 – I Enable input. Logic low turns on power switch, IN-OUT1.
EN2 4 – I Enable input. Logic low turns on power switch, IN-OUT2.
EN1 – 3 I Enable input. Logic high turns on power switch, IN-OUT1.
EN2 – 4 I Enable input. Logic high turns on power switch, IN-OUT2.
GND 1 1 I Ground
IN 2 2 I Input voltage
OC1 8 8 O Overcurrent. Logic output active low, for power switch, IN-OUT1
OC2 5 5 O Overcurrent. Logic output active low, for power switch, IN-OUT2
OUT1 7 7 O Power-switch output
OUT2 6 6 O Power-switch output

D OR P

TPS2046 TPS2056

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

detailed description

power switch

TPS2046, TPS2056

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – 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 OUTx to IN and IN to OUTx 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 (ENx or ENx)

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 ENx (TPS2046) or a logic low is present
on ENx (TPS2056). A logic zero input on ENx or logic high on ENx 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 (OCx)

The OCx
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

The TPS2046 and TPS2056 implement a dual-threshold thermal trip to allow fully independent operation of the
power distribution switches. In an overcurrent or short-circuit condition the junction temperature rises. When
the die temperature rises to approximately 140°C, the internal thermal sense circuitry checks to determine which
power switch is in an overcurrent condition and turns off that switch, thus isolating the fault without interrupting
operation of the adjacent power switches. Hysteresis is built into the thermal sense, and after the device has
cooled approximately 20 degrees, the switch turns back on. The switch continues to cycle off and on until the
fault is removed. The (OCx
occurs.

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.

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

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TPS2046, TPS2056

UNIT

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – 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 Note1) –0.3 V to 6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I(IN)

O(OUTx)

I(ENx)

(see Note1) –0.3 V to V

or V

I(ENx)

O(OUTx)

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

TPS2046 TPS2056

MIN MAX MIN MAX

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

I(IN)
I(ENx

or V

)

I(ENx)

O(OUTx)

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

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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

TPS2046, TPS2056

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – APRIL 1999

electrical characteristics over recommended operating junction temperature range, V

= rated current, V

I

O

I(ENx)

= 0 V, V

= Hi (unless otherwise noted)

I(ENx)

I(IN)

= 5.5 V,

power switch

TPS2046 TPS2056

MIN TYP MAX MIN TYP MAX

V

= 5 V,

I(IN)

IO = 0.1 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 = 0.1 A
V

= 5 V,

I(IN)

IO = 0.1 A
V

= 3.3 V,

I(IN)

IO = 0.1 A
V

= 3.3 V,

I(IN)

IO = 0.1 A
V

= 3.3 V,

I(IN)

IO = 0.1 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 ENx or ENx

TPS2046 TPS2056

MIN TYP MAX MIN TYP MAX

V

High-level input voltage 2.7 V ≤ V

IH

p

p

t

Turn-on time CL = 100 µF, RL = 20 Ω 20 20 ms

on

t

Turn-off time CL = 100 µF, RL = 20 Ω 40 40

off

TPS2046 V
TPS2056 V

4.5 V ≤ V

2.7 V≤ V
I(ENx

I(ENx)

≤ 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(ENx)

or V

= V

I(IN)

= 0 V –0.5 0.5

I(ENx)

–0.5 0.5

µ

current limit

TPS2046 TPS2056

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 enable into short circuit.

0.345 0.44 0.525 0.345 0.44 0.525 A

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

TPS2046, TPS2056

TEST CONDITIONS

UNIT

Su ly

TPS2046

,

A

V

V

TPS2056

Su ly

V

V

TPS2046

,

A

V

V

TPS2056

g

d

A

leak

g

T

25°C

A

PARAMETER

TEST CONDITIONS

UNIT

PARAMETER

TEST CONDITIONS

UNIT

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – APRIL 1999

electrical characteristics over recommended operating junction temperature range, V

= rated current, V

I

O

I(ENx)

= 0 V, V

= Hi (unless otherwise noted) (continued)

I(ENx)

I(IN)

= 5.5 V,

supply current

PARAMETE

R

pp
current,
low-level
output

pp
current,
high-level
output

Leakage
current

Reverse

age

current

No Load
on OUTx

No Load
on OUTx

OUTx
connecte
to ground

IN = high
impedance

V

= V

I(ENx)

I(ENx)

I(ENx)

I(ENx)

V

I(ENx)

V

I(ENx)

V

I(ENx

V

I(ENx)

I(IN)

= 0

= 0

=

I(IN)

= V

I(IN)

= 0 V –40°C ≤ TJ ≤ 125°C TPS2056 100
= 0 V

)

= Hi

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

–40°C ≤ TJ ≤ 125°C TPS2046 100

°

=

J

TPS2046 0.3
TPS2056 0.3

TPS2046 TPS2056

MIN TYP MAX MIN TYP MAX

0.015 1
10

0.015 1
10

80 100

100

80 100

100

undervoltage lockout

TPS2046 TPS2056

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 OCx

Sink current
Output low voltage IO = 5 mA, 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(OCx)

TPS2046 TPS2056

MIN TYP MAX MIN TYP MAX

0.5 0.5 V

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS2046, TPS2056

DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – APRIL 1999

PARAMETER MEASUREMENT INFORMATION

OUTx

V

I(ENx)

(5 V/div)

V

I(ENx)

V

O(OUTx)

t

RL CL

V

O(OUTx)

TEST CIRCUIT

50%

t

on

50%

90%

10%

V

I(ENx)

t

off

V

O(OUTx)

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(ENx)

(5 V/div)

V

O(OUTx)

(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(OUTx)

(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

TPS2046, TPS2056
DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

SLVS183 – APRIL 1999

PARAMETER MEASUREMENT INFORMATION

V

V

I(ENx)

(5 V/div)

V

O(OUTx)

(2 V/div)

0123456

t – Time – ms

V

= 5 V

I(IN)

TA = 25°C
CL = 1 µF
RL = 20 Ω

78910

I(ENx)

(5 V/div)

V

O(OUTx)

(2 V/div)

V

I(IN)

TA = 25°C
CL = 1 µF
RL = 20 Ω

0 2 4 6 8 10 12

= 5 V

14 16 18 20

t – Time – ms

Figure 4. Turnon Delay and Rise Time

with 1-µF Load

V

I(ENx)

(5 V/div)

I

O(OUTx)

(0.2 A/div)

0123456

t – Time – ms

Figure 6. TPS2046, Short-Circuit Current,

Device Enabled into Short

V

= 5 V

I(IN)

TA = 25°C

78910

V

O(OUTx)

(2 V/div)

I

O(OUTx)

(0.5 A/div)

Figure 7. TPS2046, Threshold Trip Current

Figure 5. Turnoff Delay and Fall Time

with 1-µF Load

V

= 5 V

I(IN)

TA = 25°C

01020 30405060

t – Time – ms

70 80 90 100

with Ramped Load on Enabled Device

8

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