Datasheet G526-2, G526-1 Datasheet (GMT)

Global Mixed-mode Technology Inc.

Dual USB High-Side Power Switch

Features

Compliant to USB specifications

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Low MOSFET on resistance at 5.0V 140m

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per channel
500mA minimum continuous load current per

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channel

3.0V to 5.5V input

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110µA typical on-state supply current

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1µA typical off-state supply current

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Output can be forced higher than input

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(off-state)

1.25A maximum current limit

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Thermal shutdown

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2.4V typical undervoltage lockout (UVLO)

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Open-drain fault flag pins

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1ms turn-on (soft-start) and fast turnoff

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Available with active-high or active-low

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enable

Applications

USB host and self-powered hubs

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Bus-powered hubs

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Hot plug-in power supplies

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Battery-charger circuits

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ΩΩΩΩ

max.

G526

Description

The G526 is a dual integrated high-side power switch
with independent enable and flag functions, optimized
for self-powered and bus-powered Universal Serial
Bus (USB) applications.

The G526 satisfies the following USB requirements:
the switch's low on-resistance meets USB voltage
drop requirements; fault current is limited to typically
750mA, well below the UL 25VA safety requirement;
and flag outputs are available to indicate fault condi­tions to the local USB controller. Soft start eliminates
the momentary voltage drop on the upstream port that
may occur when the switch is enabled in bus-powered
applications.

Additional features include thermal shutdown to pre­vent catastrophic switch failure from high-current loads,
under-voltage lockout (UVLO) ensuring that the device
remains off unless there is a valid input voltage pre­sent, and an enable input that is compatible with both

3.3V and 5V logic.

The G526 is available in active-high and active-low
enable versions in 8-pin SOIC packages.

Ordering Information

Pin Configuration

G526

ENA

FLGA

FLGB

ENB

1

2

3

4

8 Pin SOP

8

7

6

5

OUTA

IN

GND

OUTB

PART ENABLE TEMP. RANGE PACKAGE

40°C to ＋85°C

G526-1 Active High

G526-2 Active Low

－

40°C to ＋85°C

－

8-Pin SOP

8-Pin SOP

G526

8(OUTA)

(ENA)1

(FLGA)2

(FLGB)3

(ENB)4

GATE

CONTROL

7 (IN)

GATE

CONTROL

5 (OUTB)

6 (GND)

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Absolute Maximum Ratings

Supply Voltage (VIN)..…………………..………….+6.0V
Fault Flag Voltage (VFLG)..………………………..+6.0V
Fault flag current (IFLG)..……….………………….50mA
Output Voltage (VOUT)..…….……………..….…..+6.0V
Output Current (IOUT)………………...Internally Limited
Control Input (VEN).…………………….……-0.3V to 6V
Storage Temperature (TS)…………….-65°C to +150°C
Lead Temperature (Soldering 5 sec.)……..…..…260°C
ESD protection…………………………………..……1KV

G526

Operating Ratings

Supply Voltage (VIN).……………………...+3V to +5.5V
Ambient Operating Temperature (TA)…-40°C to +85°C
Thermal Resistance
SOIC (θJA)………………….……………….160°C/W

Electrical Characteristics

(VIN=+5V; TA=25

C; unless noted.)

°°°°

PARAMETER CONDITION MIN TYP MAX UNITS

, switch off, OUT = open 25 µA

Supply Current

Enable Input Threshold

Enable Input Current

Enable Input Capacitance 1 pF

Switch Resistance

Output Turn-On Delay RL = 10Ω each output 1 ms

Output Turn-On Rise Time RL = 10Ω each output 0.5 ms

Output Turn-Off Delay RL = 10Ω each output 1 20 µs

Output Turn-Off Fall Time RL = 10Ω each output 1 20 µs

Output Leakage Current each output 10 µA

Short Circuit Current Limit each output 0.5 0.75 1.25 A

Threshold

Error Flag Off Current V

General Note

: Off is ≤ 1.0 and on is ≥2.4V for the G526-1. Off is ≥ 2.4V and on is ≤ 1.0V for the G526-2. The enable input

Note *

: Devices are ESD protected, however, handling precautions recommended.

has approximately 200mV of hysteresis. See control threshold charts.

Note *

, switch on, OUT = open 110 µA

Note *

low to high transition 2.4 2.5 V

high to low transition,

V

= VOH(min) = 2.4V 0.01 1 µA

EN

V

= VOL(max) = 0.8V 0.01 1 µA

EN

VIN = 5V 100 mΩ

V

= 3V 140 mΩ

IN

TJ increasing 135 °C Overtemperature shutdown

decreasing 125 °C

T

J

VIN = 5V, IL=10mA 10

= 3.3V, IL =10mA 15

V

IN

= 5V 0.01 1 µA

FLAG

V

= increasing 2.5 V UVLO Threshold

IN

= decreasing 2.3 V

V

IN

1.0 2.2 V

Note *

Ω

Ω

Error Flag Output Resistance

Pin Description

PIN NUMBER PIN NAME PIN FUNCTION

1/4 EN(A/B)

2/3 FLG(A/B)

6 GND

7 IN

8/5 OUT(A/B)

Ver 1.1

Dec 27, 2002

Enable (input)

Low input <1.9V typical (-1 active high, -2 active low). Do not float.

Fault Flag (Output)

thermal shutdown.

Ground

Supply Input

positive supply.

Switch Output

: Logic-compatible enable input. High input >2.1V typical.

: Supply return.

: Output MOSFET source. Also supplies IC's internal circuitry. Connect to

: Output MOSFET drain. Typically connect to switched side of load.

: Active-low, open-drain output. Indicates overcurrent, UVLO, and

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Typical Applications

Upstream

V

BUS

100mA max.

V

BUS

D

+

D

－

GND

IN

1µF

Data

Block Diagrams

ENA

CHARGE

OUT

GND

PUMP

1µF

10k

10k

3.3V USB Controller

VIN

ON/OFF

OVERCURRENT

OVERCURRENT

ON/OFF

100k

100k

G526

ENA

OUTA

FLGA

GND

FLGB

ENB

OUTB

GATE

CONTROL

V

CC

5.0V

IN

0.1µF

47µF

47µF

＋

＋

Ferrite
Beads

Data

(Two Pair)









G526

V

BUS

D

+

D

－

GND

V

BUS

D

+

D

－

GND

USB
Port1

USB
Port2

FLGA

OUTA

CURRENT

LIMIT

OSC.

CHARGE

PUMP

THERMAL

SHUTDOWN

ENB

G526

Functional Description

The G526-1 and G526-2 are dual high-side switches
with active-high and active-low enable inputs, respec­tively. Fault conditions turn off or inhibit turn-on one or
both of the output transistors, depending upon the
type of fault, and activate the open-drain error flag
transistors to pull FLG pin to ground.

Input and Output

IN (input) is the power supply connection to the logic
circuitry and the source of the output MOSFET. OUTx
(output) is the drain of the output A or B MOSFET. In a
typical circuit, current flows through the switch from IN
to OUT toward the load.

The output MOSFET and driver circuitry are also de-

UVLO

GATE

CONTROL

1.2V

REFERENCE

IN

CURRENT

LIMIT

OUTB
FLGB

GND

signed to allow the MOSFET drain to be externally
forced to a higher voltage than the source (V

OUT

> VIN)
when the output is off. In this situation, the G526
avoids undesirable drain-to-body diode current flow by
connecting the body to the most positive voltage. If
V

OUT >VIN

from V

when switch is enabled, current will flow
to VIN.

OUT

Thermal Shutdown

Thermal shutdown shuts off both output MOSFETs
and signals both fault flags if the die temperature ex­ceeds 135°C. 10°C of hystersis prevents the switch
from turning on until the die temperature drops to
125°C. Overtemperature detection functions only
when at least one switch is enabled.

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Undervoltage Lockout

UVLO (undervoltage lockout) prevents the output
MOSFET from turning on until IN (input voltage) ex­ceeds 2.5V typical. After the switch turns on, if the
voltage drops below 2.3V typical, UVLO shuts off the
output MOSFET and signals the fault flag. Undervolt­age detection functions only when at least one switch
is enabled.

Global Mixed-mode Technology Inc.

G526

Fault Flag

FLG is an N-channel, open-drain MOSFET output.
The fault-flag is active (low) for one or more of the
following conditions: undervoltage, current limit, or
thermal shutdown. The flag output MOSFET is capa­ble of sinking a 10mA load to typically 100mV above
ground. Both flag pins may be "wire-NORed" to a
common pullup resistor.

Current Sensing and Limiting

The current limit threshold is preset internally. The
preset level prevents damage to the output MOSFET
and external load but allows a minimum current of

0.5A through the output MOSFET.

A current sense circuit senses the output current of
MOSFET switch. If output current exceeds the current
limit threshold, the output MOSFET switch is shut off
and a fault flag is pulled low. The reaction to an over­current is measured with the following scenarios:

Switch Enable into Heavy Load

If a switch is powered-on or enabled into a heavy load
or short-circuit, the switch immediately goes into a
constant-current mode, reducing output voltage. The
fault flag goes low until the load is reduced or thermal
shutdown occurs.

Heavy Load Applied Suddenly to Enabled Switch

When a heavy load is applied, a large current may
flow from the output capacitor and the switch. The
current limit circuit may shut the switch off briefly, then
fold back into constant-current mode. In that case, the
fault flag falls until the load is reduced.

Applications Information

Supply filtering

µ

F to 1µF bypass capacitor from IN to GND, lo-

A 0.1
cated at the G526, is strongly recommended to control
supply transients. Without a bypass capacitor, an out­put short may cause sufficient ringing on the input
(from supply lead inductance) to damage internal con­trol circuitry.

Input or output transients must not exceed the abso­lute maximum supply voltage (VIN max = 6V) even for
a short duration.

4.0V to 5.5V

G526

ENA

FLGA

FLGB

ENB

OUTA

IN

0.1µF to 1µF

GND

OUTB

USB Host

V

BUS

GND

Cable

USB

Controller

G526

1

ENA

2

FLGA

3

FLGB

4

ENB

4.7
µF

Bus Powered Hub

Figure 2. Soft Start (Single Channel)

OUTA

GND

OUTB

8
7

IN

6

5

C

BULK

Figure 1. Supply Bypassing

Capacitive

Cable

Downstream USB Device

Load

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G526

1

4.7
µF

ENA

2

FLGA

3

FLGB

4

ENB

V

BUS

USB Hub

GND

USB Peripheral

Cable

Figure 3. Inrush Current-Limit Application

Enable Input

EN must be driven logic high or logic low, or be pulled
high or low for a clearly defined input. Floating the
input may cause unpredictable operation. EN should
not be allowed to go negative with respect to GND.

Soft Start

The G526 presents a high impedance when off, and
slowly becomes a low impedance as it turns on. This
reduces inrush current and related voltage drop that
results from charging a capacitive load, satisfying the
USB voltage drop requirements, for bus-powered ap­plications as shown in Figure 2.

The soft start circuit shown in Figure 3 can be utilized
to meet USB transient regulation specifications with
large load capacitances (CBULK >10µF). The G526
will provide inrush current limiting for these applica­tions.

OUTA

GND

OUTB

USB

Controller

8

7

IN

C

BULK

6

5

C

USB

Function

USB

Function

BULK

G526

Transient Overcurrent Filter

V

＋

10k

USB Controller

10k

OVERCURRENT

0.1 µF

G526

1

ENA

2

FLGA

3

FLGB

45

ENB

OUTA

IN

GND

OUTB

Figure 4. Transient Filter

The inrush current from the connection of a heavy ca­pacitive load may cause the fault flag to fall for a short
duration while the switch is in a constant-current mode,
for charging the capacitance. In needed, a simple 1ms
RC low-pass filter in series with the fault flag circuit
will prevent erroneous overcurrent reporting (see Fig­ure 4).

8

7

6

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Package Information

7 °(4X)

C

E

H

D

A2

A

G526

L

θ

y

Note:

1. Package body sizes exclude mold flash and gate burrs

2. Dimension L is measured in gage plane

3. Tolerance 0.10mm unless otherwise specified

4. Controlling dimension is millimeter converted inch dimensions are not necessarily exact.

SYMBOL

A 1.35 1.60 1.75 0.053 0.063 0.069
A1 0.10 ----- 0.25 0.004 ----- 0.010
A2 ----- 1.45 ----- ----- 0.057 -----

B 0.33 ----- 0.51 0.013 ----- 0.020

C 0.19 ----- 0.25 0.007 ----- 0.010

D 4.80 ----- 5.00 0.189 ----- 0.197

E 3.80 ----- 4.00 0.150 ----- 0.157

e ----- 1.27 ----- ----- 0.050 -----

H 5.80 ----- 6.20 0.228 ----- 0.244

L 0.40 ----- 1.27 0.016 ----- 0.050

y ----- ----- 0.10 ----- ----- 0.004

θ

MIN. NOM. MAX. MIN. NOM. MAX.

0º ----- 8º 0º ----- 8º

DIMENSION IN MM DIMENSION IN INCH

e

B

A1

Taping Specification

Feed Direction

Feed Direction

Typical SOP Package Orientation

Typical SOP Package Orientation

GMT Inc. d oes not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.

Ver 1.1

Dec 27, 2002

6

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