ALLEGRO 2525, 2535 DATA SHEET

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A2525EM

1

EN

FLG

GND

Note that the A2525EM (DIP) and the
A2525EL (SOIC) are electrically identical and
share a common terminal number assignment.

2

3

45

NC

GATE

CONTROL

NC

NC NC

OUT

8

IN

7

NC

6

NC

Dwg. PP-070A

ADVANCE INFORMATION

(subject to change without notice)

August 2, 1999

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V
Output Voltage, V
Output Current,

I

................. Internally Limited

OUT

ENABLE Voltage Range,

......................... –0.3 V to 10 V

V

EN

Fault Flag Voltage, V
Fault Flag Current, I

Package Power Dissipation,

................................. See Graph

P

D

Operating Temperature Range,

......................... -40°C to +85°C

T

A

Junction Temperature, T
Storage Temperature Range,

T

........................... -65°C to 150°C

S

* Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These conditions
can be tolerated but should be avoided.

..................... 6.0 V

IN

................... 6.0 V

OUT

.............. 8.0 V

FLG

............. 50 mA

FLG

....... +150°C*

J

2525

AND

2535

USB POWER CONTROL SWITCHES

The A2525EL/M and A2535EL/M are integrated high-side power
switches, optimized for self-powered and bus-powered Universal Serial
Bus (USB) applications. Few external components are necessary to
satisfy USB requirements. The A2525EL/EM ENABLE inputs are
active high; the A2535EL/EM are active low.

All devices are ideally suited for USB applications. Each switch
channel supplies up to 500 mA as required by USB peripheral devices.
In addition, the switch’s low on-resistance permits achieving the USB
voltage-drop requirements. Fault current is limited to typically
750 mA, satisfying the UL 25 VA safety requirements, and a flag
output is available to indicate a fault condition to the local USB
controller. Momentary voltage drops that may occur on the upstream
port when the switch is enabled in bus-powered applications is elimi­nated by a “soft start” feature.

Additional features include thermal shutdown to prevent catastrophic
switch failure from high-current loads, undervoltage lockout to ensure
that the device remains OFF unless there is a valid input voltage
present, and 3.3 V and 5 V logic-compatible enable inputs.

These switches are provided in 8-pin mini-DIP (suffix ‘M’) and
8-lead SOIC (suffix ‘L’) packages.

Features

■ 2.7 V to 5.8 V Input

■ Up to 500 mA Continuous Load Current

■ 140 mΩ Maximum ON-Resistance

■ 1.25 A Maximum Short-Circuit Current Limit

■ Individual Open-Drain Fault Flag Outputs

■ 110 µA Typical ON-State Supply Current

■ 1 µA Typical OFF-State Supply Current

■ Outputs Can be Forced Higher Than Input (off-state)

■ Thermal Shutdown

■ 2.4 V Typical Undervoltage Lockout

■ 1 ms Turn On (soft-start) and Fast Turn Off

■ Active-High or Active-Low Enable Versions

■ Improved Replacements for MIC2525-1 and MIC2525-2

Applications

■ USB Hosts and Self-Powered Hubs

■ USB Bus-Powered Hubs

■ Hot Plug-In Power Supplies

■ Battery-Charger Circuits

Data Sheet

27447.1

2525

AND

2535

USB
POWER CONTROL
SWITCHES

A2535 ONLY

EN

CHARGE

PUMP

FUNCTIONAL BLOCK DIAGRAM

GATE

CONTROL

FLG

OUT

CURRENT

LIMIT

EN

FLG

GND

OSC

1.2 V
REF.

TSD

UVLO

IN

GND

Dwg. FP-049

2.5

A2535EM

2.0

1

2

3

GATE

CONTROL

NC

OUT

8

IN

7

NC

6

1.5

1.0

SUFFIX 'M', R

θJA

= 60°C/W

45

NC

NC NC

NC

Dwg. PP-070-1A

Note that the A2535EM (DIP) and the
A2535EL (SOIC) are electrically identical and
share a common terminal number assignment.

0.5

0

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1999, Allegro MicroSystems, Inc.

SUFFIX 'L', R

25

50 75 100 125 150

AMBIENT TEMPERATURE IN °C

θJA

= 108°C/W

Dwg. GP-009-2

2525

AND

2535

USB

POWER CONTROL

SWITCHES

Electrical Characteristics at T

= 25°C, V

A

= 5 V (unless otherwise noted).

IN

Limits

Parameter Test Conditions Min Typ Max Units

Operating Voltage Range V

IN

Switch Resistance VIN = 5 V, I

= 500 mA – 100 140 mΩ

OUT

2.7 – 5.8 V

VIN = 3.3 V, IOUT = 500 mA – 100 140 mΩ

Output Leakage Current Output disabled, VIN = 5 V, V

= 0 – – 10 µA

OUT

Maximum Load Current 500 – – mA

Short-Circuit Current Limit Output enabled into load, V

Current-Limit Threshold Ramped load applied to enabled output, V

= 4 V 0.5 – 1.25 A

OUT

≤ 4 V – 1.6 – A

OUT

ENABLE Input Threshold Low-to-high transition – 2.1 2.4 V

High-to-low transition 0.8 1.9 – V

ENABLE Input Hysteresis – 0.2 – V

ENABLE Input Current V

= 0 V to 5.5 V – ±0.01 ±1.0 µA

EN

ENABLE Input Cap. – 1.0 – pF

Output Turn-On Delay R

Output Turn-On Rise Time R

Output Turn-Off Delay R

Output Turn-Off Fall Time R

Error Flag Output VIN = 5 V, I
Resistance

Error Flag Off Current V

= 10Ω, each output – 0.5 – ms

L

= 10Ω each output – 1.0 – ms

L

= 10Ω each output – 1.0 – µs

L

= 10Ω each output – 1.0 – µs

L

= 10 mA – 10 – Ω

L

VIN = 3.3 V, I

= 5 V – 0.01 – µA

FLG

= 10 mA – 15 – Ω

L

Supply Current Switch OFF (see note), OUT = open – 0.75 5.0 µA

Switch ON (see note), OUT = open – 110 160 µA

UVLO Threshold Increasing V

Decreasing V

Over-Temperature Increasing T
Shutdown Threshold

Decreasing T

IN

IN

J

J

– 2.5 – V

– 2.3 – V

– 165 – °C
– 155 – °C

Note — OFF is ≤ 0.8 V and ON is ≥ 2.4 V (active high) for the A2525EL/EM. OFF is ≥ 2.4 V and ON is ≤ 0.8 V (active low) for
the A2535EL/EM.