BAYLI B2526-2P, B2526-2M, B2526-1P, B2526-1M Datasheet

Bay Linear

Bay Linear

Bay LinearBay Linear

Inspire the Linear Power

Inspire the Linear Power

Inspire the Linear PowerInspire the Linear Power

Dual USB High Side Power Switch

Description

The Bay Linear B2526 is a dual high-side power switch
recommended for self-powered and bus-powdered universal
serial for bus (USB) application conforming to USB
requirements. USB voltage drop requirements, fault current
limited to 750mA, flag output to indicate fault connections to
the local USB controller are features that meet USB
requirements.

Additional features such as thermal shutdown to prevent
catastrophic switch failure from excessively high current
loads, under voltage lockout (UVLO) to ensure that the device
remains off unless there is a valid input voltage presen t, and

3.3V or 5V logic compatible enable inputs. Two versions of
the enable pin, Active High or Active Low are available in 8­pin Dip and 8-pin SOIC packages.

Features

• 3.0V to 5.5V Input

• 110µµµµA Typical on-State Supply Current

• 1µµµµA Typical off-State Supply Current

• 500mA Minimum Continuous Load Current

• 1.25A Maximum Current Limit

• 2.4V Typical Under Voltage Lockout (UVLO)

• Open-Drain Fault Flag Pin

• Thermal Shutdown

• Available with Active-High or Active-Low Enable

Applications

• USB Host and self-Powered Hubs

• USB Power Management

• Battery-Charger Circuits

• Hot Plug-In Power Supplies

• Bus-Powered Hubs

Package Information Ordering Information

Package Enable

Active High Active Low
SO-8 B2526-1M B2526-2M
8 DIP B2526-1P B2526-2P

B2526

EN (A)

FLAG (A)

FLAG (B)

EN (B)

Bay Linear, Inc

8 Out (A)

SO-8

1

2

BAY

B2526

3

4

Top View

EN (A) 1

FLG (A) 2

(A)

V

8

OUT

V

7

IN

6

GND

V

OUT

(B)

5

FLB (B) 3

EN (B) 4

Logic

Charge

Pump

Logic

Charge

Pump

6 GND

7 IN

5 Out (B)

2418Armstrong St., Livermore CA USA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B2526

ABSOLUTE MAXIMUM RATINGS OPERATING RATING

Supply Voltage…………………………………...6V Supply Voltage..................................................+3V to +5.5V

Fault Flag Voltage………………………………..6V

Ambient Operating Temperature.................... -40°C to +85°C

Fault Flag Current……………………………..50mA
Output Voltage……………………………………6 V
Output Current……………………Internally Limited
Enable Input……………………………-0.3V to 12V
Storage Temperature………………-65°C to +150°C
Lead Temperature (Soldering 5 sec.)………….260°C

ELECTRICAL CHARACTERISTICS

Parameters

Supply Current (Note1) Switch Off, OUT = Open

Enable Input Threshold Low to High Transition

Enable Input Current VEN = 0V to 5.5V
Enable Input Capacitance 1 pF
Switch Resistance VIN = 5V I

Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
Output Turn-Off Fall Time
Output Leakage Current Each output (output disabled)
Continuous Load Current Each output 0.5 A
Short Circuit Current Limit Each output (enable into load), V
Current Limit Threshold
Over temperature Shutdown

Threshold
Error Flag Output Resistance VIN = 5.0V, IL = 10mA

Error Flag Off Current V
UVLO Threshold VIN = Increasing

General Note: Devices are ESD protected, however, handling precautions recommended.
Note 1: Off is ≤ 0.8V and is ≥ 2.4V for the B2526-1. Off is ≥ 2.4V and on is ≤ 0.8V for the B2526-2. The Enable input has approximately 200mV of hysteresis.

TEST CIRCUIT

(Only 1 Output Shown)

Conditions

(Note1) Switch On, OUT = Open

High to Low Transition, (Note1)

= 3.3V I

V

IN

= 10Ω

R

L

= 10Ω

R

L

= 10Ω

R

L

= 10Ω

R

L

Ramped Load applied to en able output, V
TJ Increasing
TJ Decreasing

= 3.3V, IL = 10mA

V

IN

= 5V

FLAG

= Decreasing

V

IN

OUT
OUT

5V

Thermal Resistance

SOIC..................................................................120°C/W

DIP.....................................................................130°C/W

at V

= 5V, Ta=25°C, unless otherwise specified. (Note 1)

IN

Typ

0.75
110

2.1

1.9

± 0.01 -1 1

= 500mA, Each Switch
= 500mA, Each Switch

OUT

0.1

F

10K

µµµµ

EN (A)

FLG (A)

FLG (B)
EN (B)

= 4.0V 0.5 0.75 1.25 A

≤

4.0V

OUT

B2526

Out (A)

IN

GND

Out (B)

100

140

0.5 ms
1 ms
1 20
1 20

10

1.6 2.2 A

0.01 1

I

OUT

R

C

L

+

L

Ferrite

Bead

Min

0.8

135
125

10
15

2.5

2.3

I

LOAD

(for Current

Limit

Response)

Max

5

160

2.4 V

140
180

V

Units

µ

A

µ

A

mΩ

µ

s

µ

s

µ

A

°

C

Ω

µ

A

Functional Characteristics Test Circuit

Bay Linear, Inc

2418Armstrong St., Livermore CA USA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

PIN DESCRIPTION

Pin No. Pin Name Pin Function

1 & 4 EN (A)/(B)

2 & 3 FLAG (A)/(B)

6 GND Ground: Supply return.
7 VIN

8 & 5 V

(A)/(B) Switch Output: Output MOSFET source. Typically connect to switched side of load.

OUT

DETAILED DESCRIPITION

Enable (Input): Logic-compatible enables input. High input > 2.1V typical.
Low input < 1.9V typical (B2526-1 active high, B2526 -2 active low).

Fault Flag (Output): Active-low, open-drain output. Indicates over current,
UVLO and thermal shutdown.

Supply Input: Output MOSFET drain. Also supplies IC’s i nternal circuitry. Connect to positive
supply.

B2526

Power Switch

The power switch is an N-Channel MOSFET with a maximum on-state resistance of 140mΩ (V
minimum of 500mA per switch.

Enable

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 5µA when a logic high is present on the EN pin for B2526-2 or a logic low is present on EN for B2526-1. The enable input
is compatible with both TTL and CMOS logic levels.

Driver

The driver controls the gate voltage of the power switch. To Limit large current surges the driver incorporates circuitry that controls
the rise and fall times of the output voltage.

Charge Pump

An internal charge pump supplies power to the driver circuit and provides the necessary voltages to pull the gate of the M OSFET
above the source.

Fault Flag FLG (A)/(B)

FLG is a N-Channel, open drain MOSFET output. The fault flag is active (low) for one or more of the following conditions: under­voltage (while 2V < V
typically 100mV above ground. Multiple FLG pins may be “wired NORed” to a common pull-up resistor.

Thermal Shutdown

An internal thermal sense circuit shuts off the power switch when the junction temperature rises to approximately 150°C. Hysteresis is
built into the thermal sense circuit.

Current Sense

A sense FET monitors the current supplied to the load. 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 sends the power FET into its sa turation region,
which switches the output into a constant current mode. The 2526 current-limit profile exhibits a small foldback effect of
approximately 500mA. Once this current-limit threshold is exceeded the device enters constant current mode. The constant current is
specified as the short circuit current limit in the “Electrical Characteristics" table. It is important to note that the 2526 will deliver load
current up to the current-limit Threshold which is typically 1.6A (2.2Amax)."

= 5V). the power switch supplies a

IN

<

2.7V), current limit or thermal shutdown. The flag output MOSFET is capable of sinking a 10mA load to

IN

Under-Voltage Lockout (UVLO)

UVLO prevents the output MOSFET form turning on until V
the switch turns on, if the voltage drops below approximately 2.3V, UVLO shuts off the output MOSFET and signals fault flag.
Under-voltage detection functions only when at least one switch is enabled.

exceeds 2.5V. In the under-voltage state, the FLG will be low. After

IN

Bay Linear, Inc

2418Armstrong St., Livermore CA USA 94550 Tel: [phone], Fax: [phone] www.baylinear.com