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Allegro MicroSystems |
2526 AND
2536
USB DUAL POWER CONTROL SWITCHES
A2526EL
The A2526EL and A2536EL are integrated high-side dual power
switches, optimized for self-powered and bus-powered Universal Serial
Bus (USB) applications. Few external components are necessary to
ENA 1
8 OUTA satisfy USB requirements. The A2526EL ENABLE inputs are active
FLGA 2
TFLGB 3
DUC Y.ENB 4
7 IN
6 GND
5 OUTB
Dwg. PP-070-6
ED PRNOCE ONLABSOLUTE MAXIMUM RATINGS
U ESupply Voltage, VIN ..................... 6.0 V
IN ROutput Voltage, VOUT .................. 6.0 V
T EOutput Current,
N FIOUT ................. Internally Limited
ENABLE Voltage Range,
O EVEN ......................... –0.3 V to 10 V
C RFault Flag Voltage, VFLG .............. 8.0 V
Fault Flag Current, IFLG ............. 50 mA
IS RPackage Power Dissipation,
PD ................................. See Graph
D OOperating Temperature Range,
FTA .......................... -40°C to +85°C
Junction Temperature, TJ ....... +150°C*
—Storage Temperature Range,
high; the A2536EL 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 elimi-
nated 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 an 8-lead SOIC package on tape and
reel (“TR” suffix is added to part number) for use with automatic
handling equipment.
Features
s 2.7 V to 5.8 V Input
s Up to 500 mA Continuous Load Current per Port
s 140 mΩ Maximum ON-Resistance
s 1.25 A Maximum Short-Circuit Current Limit
s Individual Open-Drain Fault Flag Outputs
s 125 µA Typical ON-State Supply Current
s <1 µA Typical OFF-State Supply Current
s Outputs Can be Forced Higher Than Input (off-state)
s Thermal Shutdown
s 2.2 V Typical Undervoltage Lockout
s 0.6 ms Turn On (soft-start) and Fast Turn Off
s A2526EL (active-high) Improved Replacement for MIC2526-1
s A2536EL (active-low) Improved Replacement for MIC2526-2
TS ........................... -65°C to 150°C
Applications
* Fault conditions that produce excessive
s USB Hosts and Self-Powered Hubs
junction temperature will activate device
thermal shutdown circuitry. These conditions
can be tolerated but should be avoided.
s USB Bus-Powered Hubs
s Hot Plug-In Power Supplies
s Battery-Charger Circuits
2526 AND 2536
USB
DUAL POWER CONTROL
SWITCHES
FUNCTIONAL BLOCK DIAGRAM
FLGA
A2536 ONLY
ENA
CHARGE
PUMP
OSC
TSD
UVLO
CURRENT
LIMIT
1.2 V
REF.
OUTA
IN
A2536 ONLY
ENB
CHARGE
PUMP
CURRENT
LIMIT
OUTB
FLGB
GND
A2536EL
ENA 1
FLGA 2
FLGB 3
ENB 4
8 OUTA
7 IN
6 GND
5 OUTB
Dwg. FP-049-1
2.0
1.5
1.0
RθJA = 140°C/W
0.5
Dwg. PP-070-7
Always order by complete part number, e.g., A2526ELTR ,
where “TR” indicates tape and reel.
0
25
50
75
100 125
150
TEMPERATURE IN °C
Dwg. GP-009-3A
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, 2003 Allegro MicroSystems, Inc.
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