IMP2526
P
OWER
M
ANAGEMENT
Dual USB High-Side Power
Switch
Key Features
N
N
N
N
N
N
N
N
USB Rev. 1.1 and 2.0 compliant
2.7V to 5.5V input operation
Low MOSFET ON resistance (0.1Ω at 5V)
Low supply current
– 110µA ON state current, 1µA OFF state current
500mA continuous load current per switch
1.25A maximum current limit, 750mA typical
Thermal shutdown 2.4V undervoltage lockout
(UVLO)
Open-drain flag output
– Undervoltage
– Current limit
– Thermal shutdown
Active HIGH(-1) and active LOW(-2) enable
Pin compatible with the Micrel MIC2526
– Dual switch
– 0.14
Ω
/0.1
Ω
“ON” resistance at 3/5V
– MIC2526 pin compatible
The IMP2526 dual high-side power switch IC is designed for self-
powered and bus-powered Universal Serial Bus (USB) power supply
and general purpose power management applications. ON resistance is
a low 100mΩ at 5V input and 140mΩ at 3V input.
The IMP2526 conforms to the new USB Revision 1.1 standard. Fault
current is limited to 750mA typically, and a flag output for each switch
conveys fault information to the local USB controller. The IMP2526 “Soft-
Start” function ramps the ON-current to eliminate any excessive voltage
drop on the input side that could occur when capacitive loads are
charged.
Self-monitoring features include thermal shutdown to prevent
catastrophic switch failure from high-current loads and undervoltage
lockout (UVLO) that insures that the device remains OFF unless there is
a sufficient supply voltage present.
The switch Enable input logic can interface with both 3.3V and 5V logic.
Both active-HIGH (-1 devices) and active-LOW (-2 devices) enable logic
versions are available. Supply current is a low 0.75µA when disabled and
just 110µA when enabled.
The IMP2526 devices are available in 8-pin DIP and 8-pin SO packages
and are pin compatible replacements for the Micrel MIC2526-1/-2. IMP
N
N
offers a complete family of USB power management
products. For single-switch applications see the IMP2525
and IMP2525A data sheets. The single-switch IMP2525A
features a 50% lower switch resistance, 0.07Ω. For quad-
switch applications, refer to the IMP2524 data sheet.
Applications
N
N
N
N
USB host and self-powered hubs
Bus-powered hubs
Hot plug-in power supplies
Battery chargers
2
FLGA
Block Diagrams
IMP2526
ENA
1
Charge
Pump
Gate
Control
8
OUTA
Current
Limit
Oscillator
Thermal
Shutdown
UVLO
1.2V
Reference
7
IN
Charge
Pump
ENB
4
Gate
Control
Current
Limit
5
3
OUTB
FLGB
6
2526_01.eps
GND
© 2000 IMP, Inc.
408-432-9100/www.impweb.com
1
A1PROS [ A1 PROS CO., LTD. ]
