TEXAS INSTRUMENTS TPS2074, TPS2075 Technical data

TPS2074, TPS2075

TAUSB HUB POWER CONTROLLERS

Four-port with internal LDO controller

32

40°C to 85°C

Four-port without internal LDO controller

24

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUAR Y 2001

D

Complete USB Hub Power Solution

D

Meets USB Specifications 1.1 and 2.0

D

Independent Thermal and Short-Circuit
Protection

D

3.3-V Regulator for USB Hub Controller

D

Overcurrent Logic Outputs

D

4.5-V to 5.5-V Operating Range

D

CMOS- and TTL-Compatible Enable Inputs

D

185 µA Bus-Power Supply Current

D

Available in 24-Pin SSOP Package

D

–40°C to 85°C Ambient Temperature Range

description

The TPS2074 and TPS2075 provide a complete
USB hub power solution by incorporating three
major functions: current-limited power switches
for four ports, a 3.3-V 100-mA regulator, and a
DP0 line control to signal attach/detach of the hub.

These devices are designed to meet bus-pow­ered and self-powered hub requirements. These

PG_DLY

AGND

3.3V_OUT

BPMODE

DP0_RST

DGND

NC – No internal connection

†

Pin 9 is active low (BPMODE
and active high (BPMODE) for TPS2075.

simplified hybrid-hub diagram

Power

Supply

DB PACKAGE

EN1

PG

SP
SP

NC

†

EN2

SP

devices are also designed for hybrid hub
implementations and allow for automatic switch­ing from self-powered mode to bus-powered
mode if loss of self-power is experienced. This
feature can be disabled by applying a logic high to
the BP_DIS input

Each port has a current-limited 100-mΩ N­channel MOSFET high-side power switch for
500 mA self-powered operation. Each port also
has a current-limited 500-mΩ N-channel MOS-
FET high-side power switch for 100-mA bus­powered operation. All the N-channel MOSFETs

Upstream

Port

D+
D–

5 V

GND

1.5
kΩ

DP0_RST
BP

3.3 V_OUT BPMODE

VCCEN OC

DP0
DM0

are designed without parasitic diodes, preventing
current backflow into the inputs.

‡

For applications where a 5-V regulator is needed,

See Figure 33 for complete implementation.

use the TPS2070 or TPS2071 device.

SELECTION GUIDE

PACKAGED DEVICES

PIN COUNT BPMODE HTSSOP (DAP) SSOP (DB)

p

–

p

†

The DB package is available taped and reeled. Add an R suffix to the device type (e.g., TPS2074DBR).

Active low TPS2070DAP —

Active high TPS2071DAP —

Active low — TPS2074DB

Active high — TPS2075DB

(TOP VIEW)

1
2
3
4
5
6
7
8
9
10
11
12

TPS2074

Hub

Controller

BP_DIS

24

BP

23

OUT1

22

OUT2

21

OUT3

20

OUT4

19

OC4

18

OC3

17

OC2

16

OC1

15

EN4

14

EN3

13

) for TPS2074

OUT1

OUT2

OUT3
OUT4

DP1

DM1

DP2

DM2

DP3

DM3

DP4

DM4

‡

D+
D–

5 V
GND

D+
D–

5 V
GND

Downstream

Ports

D+
D–

5 V
GND

D+
D–

5 V
GND

†

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  2001, Texas Instruments Incorporated

1

TPS2074, TPS2075
FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

functional block diagram

BP

SP
SP

3.3 V/100 mA LDO

S1

S2

S3

S4

S5

S6

3.3 V_OUT

PG
PG_DLY

OUT1

OUT2

OUT3

S7

S8

Control

Logic

OUT4

DPO_RST
BP_DIS
AGND
DGND

EN1
OC1

EN2
OC2
EN3
OC3

EN4
OC4
BPMODE (TPS2074)

BPMODE (TPS2075)

2

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TPS2074, TPS2075

I/O

DESCRIPTION

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

Terminal Functions

TERMINAL

NAME NO.

PG_DLY
EN1 2 I Active-low enable for OUT1
AGND 3 Analog ground
PG 4 O Logic output, power good
SP 5 I Self-power voltage input, connects to local power supply
SP 6 I Self-power voltage input, connects to local power supply
NC 7 No internal connection

3.3V_OUT 8 O 3.3-V internal voltage regulator output
BPMODE

DP0_RST 10 O Connects to DP signal from upstream hub/host through an external 1.5-kΩ resistor
EN2 11 I Active-low enable for OUT2
DGND 12 Digital ground
EN3 13 I Active-low enable for OUT3
EN4 14 I Active-low enable for OUT4
OC1 15 O Logic output, overcurrent response for OUT1
OC2 16 O Logic output, overcurrent response for OUT2
OC3 17 O Logic output, overcurrent response for OUT3
OC4 18 O Logic output, overcurrent response for OUT4
OUT4 19 O Power switch output for downstream ports
OUT3 20 O Power switch output for downstream ports
OUT2 21 O Power switch output for downstream ports
OUT1 22 O Power switch output for downstream ports
BP 23 I Bus power voltage input, connect to V
BP_DIS 24 I Active-high logic input, disables autoswitch to bus power when self power is disconnected. Connect to BP or GND

†

‡

†

1 Adjusts the PG time delay with a capacitor to ground. Adjust the pulse width to fit the application.

‡

9 O A logic signal that indicates if the outputs source from the bus-powered supply, BPMODE (TPS2074) or BPMODE

Use the following formula to calculate the capacitance needed;
C = (desired pulse width × 3 × 10–6 / 1.22
Pin 9 is active low for TPS2074 and active high for TPS2075.

(TPS2075), can be used to signal the hub controller.

BUS

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3

TPS2074, TPS2075
FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

detailed description

BP

The bus-powered supply input (BP) serves as the source for the internal 3.3-V LDO and for all logic functions
in the device. In bus-powered mode, BP also serves as the source for all the outputs (OUTx). If BP is below the
undervoltage threshold, all power switches will turn off and the LDO will be disabled. BP must be connected to
a voltage source in order for the device to operate.

SP

The self-powered supply input (SP) serves as the source for all the outputs (OUTx) in self-powered mode. The
enable logic for the SP switches requires that BP be connected to a voltage source.

OUT1, OUT2, OUT2, OUT4

OUTx are the outputs of the integrated power switches.

3.3V_OUT

The internal 3.3-V LDO output can be used to supply up to 100 mA current to low-power functions, such as hub
controllers.

DP0_RST

DP0_RST functions as a hub reset when a 1.5-kΩ resistor is connected between DP0_RST and the upstream
DP0 data line in a hub system. To provide a clean attach signal on DP0 data line, the DP0_RST output goes
low momentarily (because of the upstream pulldown resistor) to discharge any parasitic charge on the cable,
then goes to 3-state and finally outputs a high signal. The low and Hi-Z pulse widths are adjustable using a
capacitor between PG_DL Y and ground, and are approximately 50% of the power-good time delay. Detachment
is signaled by a Hi-Z on DP0_RST. Both DP0_RST and PG will transition high at the same time.

Power Good (PG)

The power good (PG) function serves as a reset for a USB hub controller. PG is asserted low when the output
voltage on the internal voltage regulator is below a fixed threshold. A time delay to ensure a stable output voltage
before PG goes high is adjustable using a small-value ceramic capacitor from PG_DLY to ground.

PG_DLY

PG_DL Y connects to an external capacitor to adjust the time delay for PG and DP0_RST . For USB applications,
a 0.1 µF capacitor is recommended, however, reference the USB hub controller data sheet to determine the
needed pulse width criteria.

BP_DIS

BP_DIS is used to enable or disable the autoswitching function between bus-powered mode and self-powered
mode. When BP_DIS is connected low and the voltage on SP is greater than the undervoltage-lockout (UVLO)
threshold, the device will switch to self-powered operation automatically; if the SP voltage falls lower than the
UVLO threshold, the device will switch to bus-powered operation. When BP_DIS is connected high, the
autoswitching function is disabled and the device will not autoswitch to bus-powered operation if the SP voltage
is below the UVLO threshold.

BPMODE

4

or BPMODE

BPMODE
mode. The logic state is set according to the voltages on BP, SP, and BP_DIS. For the TPS2074, BPMODE
outputs a low signal to indicate bus-powered mode or a high signal to indicate self-powered mode. For the
TPS2075, BPMODE outputs a high signal to indicate bus-powered mode or a low signal to indicate self-powered
mode. This output can be used to inform a USB hub controller to configure for bus-powered mode or
self-powered mode.

(TPS2074) or BPMODE (TPS2075) is an output that signals when the device is in bus-powered

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPS2074, TPS2075

Input voltage

V

O

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

detailed description (continued)

OC1, OC2, OC3, OC4

OCx is an output signal that is asserted (active low) when an overcurrent or overtemperature condition is
encountered for the corresponding channel. OCx
condition is removed.

, EN2, EN3, EN4,

EN1

will remain asserted until the overcurrent or overtemperature

The active-low logic input ENx

enables or disables the power switches in the device. The enable input is
compatible with both TTL and CMOS logic levels. The switches will not turn on until 3.3V_OUT is above the PG
threshold.

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

Input voltage range: V
Output voltage range: V

, V

I(BP)

O(OUTx)

V

O(3.3V_OUT)

V

O(DP0_RST)

Continuous output current: I
Maximum 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. . . . . . . . . . . . . . . . . . . . . . .

†

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.

‡

All voltages are with respect to GND.

PACKAGE

24 DB 889.7 mW 8.9 mW/°C 489.3 mW 355.9 mW

TA ≤ 25°C

POWER RATING

, V

I(SP)

I(ENx)

, V

, V

O(OUTx)
O(BPMODE)

stg

, I

DISSIPATION RATING T ABLE

, V

I(BP_DIS)

O(PG_DLY)

O(PG)

O(3.3V_OUT)

or I

DERATING FACTOR

ABOVE TA = 25°C

, V

O(BPMODE)

J

O(OCx)

, I

O(DP0_RST)

, V

O(BPMODE)

, I

TA = 70°C

POWER RATING

,

–0.3 V to VO

, I

O(PG)

POWER RATING

O(OCx)

TA = 85°C

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

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

(3.3V_OUT)

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

±10 mA. . . . . . . . . .

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

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

0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . .

†‡

recommended operating conditions

V

I(BP)

V

p

Continuous output current, I

Operating virtual junction temperature, T

I(SP)

VI

(BP_DIS)

VI

(ENx

)

BP to OUTx (per switch) 100
SP to OUTx (per switch) 500

O

BP to 3.3V_OUT 100

J

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MIN MAX UNIT

4.5 5.5
0 5.5
0 5.5
0 5.5

mA

-40 125 °C

5

TPS2074, TPS2075

ENx = V

I(BP)

I

ENx = 0 V

ENx = V

I(SP)

I

ENx = 0 V

Static

V

V

5 V,I

0.5 A

r

mΩ

V

4.5 V

V

Open

I

0.1 A

I

OUTx (

A

Short-ci

t

V

IIInput current

A

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

electrical characteristics over recommended operating junction temperature range,

4.5 V ≤ V

≤ 5.5 V, 4.85 V ≤ V

I(BP)

input current

PARAMETER

Input current at BP, switches disabled

I(BP)

Input current at BP, switches enabled

Input current at SP, switches disabled

I(SP)

Input current at SP, switches enabled

†

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

≤ 5.5 V, ENx = 0 V, BP_DIS = 0 V (unless otherwise noted)

I(SP)

TEST CONDITIONS

No load on OUTx and 3.3V_OUT,

No load on OUTx and 3.3V_OUT,

No load on OUTx and 3.3V_OUT,

No load on OUTx and 3.3V_OUT,

†

V

= Hi-Z 185 240

I(SP)

V

= 0 V 185 240

I(SP)

V

= 5 V 175 210

I(SP)

V

= Hi-Z 185 240

I(SP)

V

= 0 V 185 240

I(SP)

V

= 5 V 175 210

I(SP)

V

= Hi-Z 90 115

I(BP)

V

= 0 V 90 115

I(BP)

V

= 5 V 115 140

I(BP)

V

= Hi-Z 90 115

I(BP)

V

= 0 V 90 115

I(BP)

V

= 5 V 115 140

I(BP)

MIN TYP MAX UNIT

µA

µA

µA

µA

power switches

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SP to

DS(on)

lkg(OUTx)

†

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

NOTE: All BP to OUTx , SP to OUTx switches and the internal 3.3-V voltage regulator are loaded to the recommended continuous current rating

drain-source
on-state
resistance

Leakage current at

3.3V_OUT)

(per output)

of 100 mA, 500 mA and 100 mA, respectively, for the static drain-source on-state resistance measurements.

OUTx
BP to

OUTx

no load on

rcuit curren

†

=

I(SP)

=

I(BP)

ENx = V
OUTx

connected to ground, V

ENx = V
OUTx connected to ground

x = V

EN
V

= V

I(SP)

ENx = V
V

I(OUTx)

VI(BP) = VI(SP) = 5 V, OUTx connected to GND,
Device enabled into short circuit

V

= 5 V, V

I(BP)

OUTx connected to GND, device enabled into short
circuit

I(BP)

,

= 5.5 V, V

I(BP)

= V

I(BP)

= Hi-Z or 0 V,

I(BP)

I(OUTx)

= V

I(BP)

= 5.5 V

=

I(SP)

= 5.5 V

I(SP)

I(SP)

=

Ox

I(SP)

I(SP)

= 5.5 V,

= Hi-Z or 0 V,

= open,

p

=

= Hi-Z,

I(VIN)

,

Ox

= Hi-Z

=

TA = 25°C 100
TA = 70°C 110 150
TA = 25°C 500
TA = 70°C 600 900

TJ = 25°C 0.5 10

TJ = 25°C 0.5 10

µ

TJ = 25°C 0.5 10

TJ = 25°C 0.5 10

0.6 0.9 1.2
A

0.12 0.2 0.3

input signals (ENx, BP_DIS)

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

V
V

High-level input voltage 2

IH

Low-level input voltage 0.8

IL

p

Pullup ENx (active low) V
Pulldown BP_DIS (active high) V

= 0 V

I(EN

x)

I(BP_DIS)

= 5 V 5

5

µ

6

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TPS2074, TPS2075

VOHHigh-level output voltage

I

2 mA

V

I

3.2 mA

Minimum input voltage at BP for
Start threshold

V

Stop threshold

V

V

Hysteresis voltage (see Note 1)

mV

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

electrical characteristics over recommended operating junction temperature range,

4.5 V ≤ V

≤ 5.5 V, 4.85 V ≤ V

I(BP)

(continued)

output signals (BPMODE or BPMODE, OCx, DPO_RST)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

BPMODE

BPMODE

p

OCx

DPO_RST

BPMODE

V

V

I

lkg

t

d

NOTE 1: Specified by design, not tested in production.

Low-level output voltage

OL

I(BP)

low-level output

Hi-Z leakage current at DP0_RST
Overcurrent response delay time

(see Note 1)

p

BPMODE

OCx

≤ 5.5 V, ENx = 0 V, BP_DIS = 0 V (unless otherwise noted)

I(SP)

4.25 V ≤ V

4.5 V ≤ V

4.25 V ≤ V
V

< 4 V

I(SP)

4.25 V ≤ V
V

I(EN

x)

4.25 V ≤ V
V

I(PG_DLY)

4.25 V ≤ V
V

< 4 V

I(SP)

4.25 V ≤ V

4.5 V ≤ V

4.25 V ≤ V
OUTx = 0 V

IO = 300 µA, V
IO = 300 µA, V
0 V ≤ V

V

= 5.5 V, V

I(BP)

≤ 5.5 V,

I(BP)

≤ 5.5 V

I(SP)

≤ 5.5 V,

I(BP)

≤ 5.5 V,

I(BP)

= 3.3 V or Hi-Z

≤ 5.5 V,

I(BP)

= 3.3 V

≤ 5.5 V,

I(BP)

≤ 5.5 V,

I(BP)

≤ 5.5 V

I(SP)

≤ 5.5 V,

I(BP)

I(SP)

I(DPO_RST)

I(PG_DLY)

O

O

I

O(OC

= 5 V
≤ 3.3 V, V

V

= 0.9 V

=

=

= 3.2 mA

)

O(BPMODE
O(BPMODE)

= 0 V,

I(SP)

≤ 0.4 V

)

≤ 0.4 V,

2.4

2.4

2.4

2.4

–5 5 µA

1 10 ms

0.4

0.4

0.4

1.5

1.5

V

V

undervoltage lockout (SP and BP)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

p

hys

NOTE 1: Specified by design, not tested in production.

SP 4.5
BP V
SP 4
BP 3.75
SP 300
BP 300

= Hi-Z 4.25

I(SP)

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7

TPS2074, TPS2075

_

mA

tonTurnon time (see Note 1)

ms

t

Turnoff time (see Note 1)

ms

trRise time, output (see Note 1)

ms

tfFall time, output (see Note 1)

ms

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

electrical characteristics over recommended operating junction temperature range,

4.5 V ≤ V

≤ 5.5 V, 4.85 V ≤ V

I(BP)

otherwise noted)

internal voltage regulator

PARAMETER

V

I

OS

PSRR Power-supply ripple rejection (see Note 1)

V
V
V
V

ref

t

d

†

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

NOTES: 1. Specified by design, not tested in production.

Output voltage, dc V

O

Dropout voltage IO = 100 mA 0.6 V
Line regulation V
Load regulation V
Short-circuit current limit

Pulldown transistor at 3.3V_OUTPUT
(see Note 1)

Low-level trip threshold voltage at PG 2.88 2.94 3 V
Hysteresis voltage at PG (see Note 1) 50 100 mV

hys

High-level output voltage at PG 4.25 V ≤ V

OH

Low-level output voltage at PG 4.25 V ≤ V

OL

Reference voltage at PG_DLY 1.22 V
Charge current at PG_DLY 3 µA
Delay time at PG (see Notes 1 and 2) C

2. The PG delay time (td) is calculated using the PG_DLY reference voltage and charge current:
C

L(PG_DLY)

td+

Charge Current

†

V

ref

≤ 5.5 V, ENx = 0 V, BP_DIS = 0 V, C

I(SP)

TEST CONDITIONS MIN TYP MAX UNIT

= 4.25 V to 5.5 V, IO= 5 mA to 100 mA 3.2 3.3 3.4 V

I(BP)

= 4.25 V to 5.25 V, IO= 5 mA 0.1 %/v

I(BP)

= 4.25 V, IO= 5 mA to 100 mA 0.6%

I(BP)

V

= 4.25 V, 3.3V_OUT connected to GND 0.12 0.2 0.3 A

I(BP)

V

I(3.3V_OUT)

V

I(3.3V_OUT)

F = 1 kHz, C
IO=5 mA, V

L(PG_DLY)

= 3.3 V 10
= 1 V

L(3.3V_OUT)
I(BP)PP

≤ 5.25 V, IO = 2 mA 2.4 V

I(BP)

≤ 5.25 V, IO = 3.2 mA 0.4 V

I(BP)

= 0.47 µF 190 ms

=4.7 µF, ESR=0.25 Ω ,

=100 mV

L(3.3V_OUT)

5

40 dB

= 10 µF (unless

power switch timing requirements

PARAMETER TEST CONDITIONS

BP to OUTx
switch

SP to OUTx
switch

BP to OUTx

off

p

p

†

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

‡

All BP to OUTx , SP to OUTx switches and the internal 3.3-V voltage regulator are loaded to the recommended continuous current rating of
100 mA, 500 mA and 100 mA, respectively, for the static drain-source on-state resistance measurements.

NOTE 1. Specified by design, not tested in production.

switch
SP to OUTx

switch
BP to OUTx

switch
SP to OUTx

switch
BP to OUTx

switch
SP to OUTx

switch

V

= 5 V, V

I(BP)

CL = 100 µF, RL = 50 Ω
V

= V

I(SP)

CL = 100 µF, RL = 10 Ω
V

I(BP)

CL = 100 µF, RL = 50 Ω
V

I(SP)

CL = 100 µF, RL = 10 Ω
V

I(BP)

CL = 100 µF, RL = 50 Ω
V

I(SP)

CL = 100 µF, RL = 10 Ω
V

I(BP)

CL = 100 µF, RL = 50 Ω
V

I(SP)

CL = 100 µF, RL = 10 Ω

I(BP)

= 5 V, V

= V

I(BP)

= 5 V, V

= V

I(BP)

= 5 V, V

= V

I(BP)

= open, TA = 25°C,

I(SP)

= 5 V, TA = 25°C,

= open, TA = 25°C,

I(SP)

= 5 V, TA = 25°C,

= open, TA = 25°C,

I(SP)

= 5 V, TA = 25°C,

= open, TA = 25°C,

I(SP)

= 5 V, TA = 25°C,

†‡

MIN TYP MAX UNIT

4.5

4.5

15

10

4

3

10

3

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

thermal shutdown

TJThermal shutdown

°C

Hysteresis

°C

TPS2074, TPS2075

FOUR-PORT USB HUB POWER CONTROLLERS

SLVS288A – SEPTEMBER 2000 – REVISED FEBRUARY 2001

PARAMETER MIN TYP MAX

First 140
Second 150
First 15
Second 25

UNIT

°

DUT

+

IN OUT

TEST CIRCUIT

Figure 1. Current Limit Response

V

I(EN)

(2 V/div)

Current

Meter

V

= 5 V

I(BP)

TA = 25°C
CL = 10 µF
RL = 50 Ω

V

I(ENx

V

O(OUTx)

V

O(OUTx)

)

t

pd(on)

t

on

50% 50%

10% 10%

t

r

10% 10%

TIMING

90% 90%

90% 90%

t

pd(off)

t

off

t

f

Figure 2. Timing and Internal Voltage Regulator

Transition Waveforms

V

I(EN)

(2 V/div)

V

O(out)

(2 V/div)

0 2 4 6 8 10 12 14 16 18 20

t – time – ms

Figure 3. Turnon Delay and Rise Time

(BP Switch)

V

O(OUT)

(2 V/div)

0 2 4 6 8 101214161820

Figure 4. Turnoff Delay and Fall Time

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

V

= 5 V

I(BP)

TA = 25°C
CL = 10 µF
RL = 50 Ω

t – time – ms

(BP Switch)

9