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SLVS401 − AUGUST 2001

    

     

www.ti.com

FEATURES

Complete Power Management Solution for

USB Bus-Powered Hubs

D 3.3-V 200 mA Low-Dropout Voltage Regulator

D Two 5-V 340-mΩ (Typ) High-Side MOSFETs

D Independent Thermal- and Short-Circuit

Protection for LDO and Each Switch

D Overcurrent Indicator With Transient Filter

D 2.9-V to 5.5-V Operating Range

D CMOS- and TTL-Compatible Enable Inputs

D 75-µA (Typ) Supply Current

D Available in 8-Pin MSOP (PowerPAD)

D −40°C to 85°C Ambient Temperature Range

APPLICATIONS

USB Bus-Powered Hubs

− Keyboards

− Monitors

− Hub Boxes

DESCRIPTION

The TPS2149 incorporates two power distribution

switches and an LDO in one small package, providing

a USB bus-powered hub power management solution

that saves up to 60% in board space over typical

implementations.

The TPS2149 meets USB 2.0 bus-powered hub

requirements. An integrated LDO regulates the 5-V bus

power down to 3.3 V for the USB controller. The two

MOSFET switches provide power to the downstream

ports. With independent enables, the downstream ports

remain unpowered until the hub completes

enumeration.

Each power-distribution switch is capable of supplying

200 mA of continuous current, and the independent

logic enables are compatible with 5-V logic and 3-V

logic. The switches and the LDO are designed with

controlled rise times and fall times to minimize current

surges.

The TPS2149 has active-low enables while the

TPS2159 has active-high enables.

LDO and dual switch family selection guide and schematics

LDO

LDO_OUT

LDO_ADJ

OC1

OUT1

OUT2

OC2

IN/SW1

DO_EN

EN1

SW2

EN2

GND

TPS2145/55

TSSOP−14

LDO

LDO_OUT

OC1

OUT1

OUT2

OC2

VIN/SW1

EN1

SW2

EN2

GND

TPS2147/57

MSOP−10

LDO

LDO_OUT

OUT2

OUT1

IN/SW1

EN2

EN1

GND

TPS2148/58

MSOP−8

LDO_EN

LDO

LDO_OU

OUT1

OUT2

VIN

EN1

EN2

GND

TPS2149/59

MSOP−8

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PowerPAD is a trademark of Texas Instruments.

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.

Summary of content (23 pages)

PAGE 1
SLVS401 − AUGUST 2001 FEATURES D Complete Power Management Solution for D D D D D D D D D DESCRIPTION The TPS2149 incorporates two power distribution switches and an LDO in one small package, providing a USB bus-powered hub power management solution that saves up to 60% in board space over typical implementations. USB Bus-Powered Hubs 3.
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SLVS401 − AUGUST 2001 AVAILABLE OPTIONS TA PACKAGE AND PIN COUNT DESCRIPTION −40°C to 85°C PACKAGED DEVICES ACTIVE LOW (SWITCH) ACTIVE HIGH (SWITCH) Adjustable LDO with LDO enable TSSOP-14 TPS2145IPWP TPS2155IPWP 3.3-V fixed LDO MSOP-10 TPS2147IDGQ TPS2157IDGQ 3.3-V Fixed LDO with LDO enable and LDO output switch MSOP-8 TPS2148IDGN TPS2158IDGN 3.3-V Fixed LDO, shared input with switches MSOP-8 TPS2149IDGN TPS2159IDGN NOTE: All options available taped and reeled.
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SLVS401 − AUGUST 2001 recommended operating conditions VI(VIN) VI(ENx) Input voltage Continuous output current, IO Output current limit, IO(LMT) MIN MAX 2.9 5.5 0 5.
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SLVS401 − AUGUST 2001 electrical characteristics over recommended operating junction-temperature range, 2.9 V ≤ VI(VIN) ≤ 5.
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SLVS401 − AUGUST 2001 electrical characteristics over recommended operating junction-temperature range, 2.9 V ≤ VI(VIN) ≤ 5.5 V, VI(ENx) = 0 V, TJ = −40°C to 100°C (unless otherwise noted) enable input, ENx (active low) PARAMETER VIH VIL High-level input voltage II Input current, pullup (source) TEST CONDITIONS MIN TYP MAX 2 UNIT V Low-level input voltage VI(ENx) = 0 V 0.
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SLVS401 − AUGUST 2001 TPS2149 functional block diagram 3.3 V / 200 mA LDO VIN LDO_OUT CS Charge Pump OUT1 Current Limit Driver OC EN1 Thermal Sense OUT2 CS Current Limit Driver EN2 Thermal Sense GND Terminal Functions TERMINAL NAME NO.
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SLVS401 − AUGUST 2001 detailed description VIN The VIN serves as the input to the internal LDO and as the input to both N-channel MOSFETs. The 3.3-V LDO has a dropout voltage of 0.35 V and is rated for 200 mA of continuous current. The power switches are N-channel MOSFETs with a maximum on-state resistance of 580 mΩ per switch. Configured as high-side switches, the power switches prevent current flow from OUT to IN and IN to OUT when disabled.
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SLVS401 − AUGUST 2001 PARAMETER MEASUREMENT INFORMATION 50% VI(ENx) 50% tpd(off) ton toff tpd(on) 90% VO(OUTx) 90% 10% 10% tr tf 90% VO(OUTx) 90% 10% 10% TIMING Figure 1.
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SLVS401 − AUGUST 2001 TYPICAL CHARACTERISTICS SWITCH TURNOFF DELAY AND FALL TIME WITH 120-µF LOAD SWITCH TURNON DELAY AND RISE TIME WITH 120-µF LOAD VI(EN) (5 V/div) VI(EN) (5 V/div) VO(OUT) (2 V/div) VO(OUT) (2 V/div) VI = 5 V TA = 25°C CL = 120 µF RL = 25 Ω VI = 5 V TA = 25°C CL = 120 µF RL = 25 Ω 0 2 4 6 8 10 12 14 t − Time − ms 16 18 0 20 4 Figure 4 8 12 16 20 24 28 t − Time − ms 32 36 40 Figure 5 SHORT-CIRCUIT CURRENT, SWITCH ENABLED INTO A SHORT LDO TURNON DEL
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SLVS401 − AUGUST 2001 TYPICAL CHARACTERISTICS LOAD TRANSIENT RESPONSE LINE TRANSIENT RESPONSE IO(LDO_OUT) 5.25 V VI(VIN) 4.25 V (200 mA/div) ∆VO(LDO_OUT) (100 mV/div) ∆VO(LDO_OUT) (0.05 V/div) TA = 25°C CL(LDO_OUT) = 4.7 µF ESR = 1 Ω IO(LDO_OUT) = 200 mA 0 TA = 25°C CL(LDO_OUT) = 4.
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SLVS401 − AUGUST 2001 rDS(on) − Static Drain-Source On-State Resistance − Ω STATIC DRAIN-SOURCE ON-STATE RESISTANCE vs JUNCTION TEMPERATURE 0.6 0.55 0.5 0.45 SW1 0.4 SW2 0.35 0.3 0.25 0.2 0.15 0.1 −40 −20 0 20 40 60 80 TJ − Junction Temperature − °C 100 rDS(on) − Static Drain-Source On-State Resistance − Ω TYPICAL CHARACTERISTICS STATIC DRAIN-SOURCE ON-STATE RESISTANCE vs SUPPLY VOLTAGE 0.38 0.37 0.36 0.35 SW1 0.34 SW2 0.33 0.32 0.31 0.3 2.
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SLVS401 − AUGUST 2001 TYPICAL CHARACTERISTICS UNDERVOLTAGE LOCKOUT vs JUNCTION TEMPERATURE 2.9 UVLO − Undervoltage Lockout − V 2.8 Rising 2.7 2.6 2.5 Falling 2.4 2.3 2.2 2.1 −40 −25 −10 5 20 35 50 65 80 TJ − Junction Temperature − °C 95 110 Figure 16 APPLICATION INFORMATION external capacitor requirements on power lines A ceramic bypass capacitor (0.01-µF to 0.1-µF) between VIN and GND, close to the device, is recommended to improve load transient response and noise rejection.
PAGE 13
SLVS401 − AUGUST 2001 APPLICATION INFORMATION overcurrent (continued) In the second condition, the short occurs while the device is enabled. At the instant the short occurs, very high currents may flow for a very short time before the current-limit circuit can react. After the current-limit circuit has tripped (reached the overcurrent trip threshold), the device switches into constant-current mode.
PAGE 14
SLVS401 − AUGUST 2001 APPLICATION INFORMATION Compare the calculated junction temperature with the initial estimate. If they do not agree within a few degrees, repeat the calculation, using the calculated value as the new estimate. Two or three iterations are generally sufficient to get a reasonable answer. thermal protection Thermal protection prevents damage to the IC when heavy-overload or short-circuit faults are present for extended periods of time.
PAGE 15
SLVS401 − AUGUST 2001 APPLICATION INFORMATION universal serial bus (USB) applications (continued) The TPS2149 and TPS2159 are well suited for USB bus-powered hub applications. The internal LDO can be used to provide the 3.3 V power needed by the controller while the dual switches distribute power to the downstream functions.
PAGE 16
SLVS401 − AUGUST 2001 APPLICATION INFORMATION Upstream Port USB Hub Controller D+ D− DP0 DM0 GND D+ D− DP1 DM1 C D A B A B VCC_3.3 V 0.1 µF 0.1 µF DP3 DM3 GND SN75240 A B 33 pF 1.5 kΩ XTAL2 5V C D 68 µF DP4 DM4 D+ D− TPS2149 GND GND 5V 68 µF D+ D− 6 MHz 1.5 kΩ C D DP2 DM2 XTAL1 33 pF 10 µF GND SN75240 SN75240 5V Downstream Port PWRON1 EN1 OUT1 PWRON2 OVRCUR EN2 OUT2 OC GND 5V 68 µF D+ D− 3.3 V_OUT 10 µF 0.1 µF GND VIN 5V 68 µF Figure 17.
PAGE 17
SLVS401 − AUGUST 2001 APPLICATION INFORMATION Upstream Port USB Hub Controller D+ D− DP0 DP1 DM0 DM1 5V D+ D− SN75240 SN75240 GND Downstream Port A C A C B D B D GND 5V 68 µF VCC_3.3 V 0.1 µF 0.1 µF DP1 D+ DM1 D− XTAL1 33 pF GND 6 MHz 10 µF 33 pF 1.5 kΩ TPS2149 GND GND 1.5 kΩ 5V XTAL2 PWRON1 EN1 OUT1 PWRON2 OVRCUR EN2 OUT2 68 µF OC 3.3 V_OUT 10 µF 0.1 µF VIN Figure 18. Example of a 4 Port Hub Design With TPS2149 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 21-Mar-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.