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IMP Inc - Quad USB High-Side Power Switch with Fault Detection

Numéro de référence IMP2524
Description Quad USB High-Side Power Switch with Fault Detection
Fabricant IMP Inc 
Logo IMP  Inc 





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IMP2524 fiche technique
IMP2524/27
POWER MANAGEMENT
ADVANCE PRODUCT INFORMATION
Quad USB High-Side Power
Switch with Fault Detection
The IMP2524 and IMP2527 are complete power management solutions
for bus-powered and self-powered USB hubs. Each device contains four
independent power switches and fault detection logic. The IMP2524
channel resistance is a low 140mmaximum and the IMP2527 channel
resistance is 300maximum. Both device operate with voltage inputs
from 2.7V to 5.5V
The IMP2524/2527 conform to the new USB 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 IMP252x “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
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 quad IMP2524/7 devices are available in 16-pin DIP and 16-pin
SO packages and are pin compatible replacements for the Micrel
MIC2524-1/-2 and MIC2527-1/2 devices. IMP 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 0.07switch resistance. For dual-switch applications, refer to
the IMP2526 data sheet.
Typical Application
Key Features
N USB Rev. 1.1 and 2.0 Compliant
N Four independent switches
N 2.7V to 5.5V input operation
N Low MOSFET ON resistance
– IMP2524: 0.1, 0.14maximum
– IMP2527: 0.2, 0.3maximum
N 500mA continuos load current per switch
N Low supply current
– 110µA ON-state current, 0.75µA OFF-state
current
N 1.25A maximum current limit, 750mA typical
N Thermal shutdown 2.4V undervoltage lockout
(UVLO)
N Open-drain flag output
– Undervoltage
– Current limit
– Thermal shutdown
N Output can be force higher than input
N Active HIGH(-1) and active LOW(-2) enable
N 16-pin SO and DIP packages, Die available
N Pin compatible with the Micrel MIC2524 and
MIC2527
Applications
N USB host and self-powered hubs
N USB video monitors
N USB printers
IMP2527
5.1V ± 3%
5V ± 1%
or
IMP2524
5V ± 3%
4.7mF +
IN OUT
LDO
GND
Data
10k
V+ ON/OFF
OVERCURRENT
USB Controller
D+
D– GND
1mF
27k IMP2524
IMP2527
2 ENA INA/B 16
1 FLGA INC/D 15
3 ENB OUTA 14
4 FLGB OUTB 13
5 ENC OUTC 12
6 FLGC OUTD 11
7 END GND 10
8 FLGD GND 9
Bold/Blue lines indicate 0.1" wide, 1-oz. copper high-current traces.
*33mF, 16V tantalum or 100mF, 10V electrolytic per port
Ferrite Bead
33mF* +
0.01mF
VBUS
D+
D–
GND
0.1mF
33mF* +
0.01mF
VBUS
D+
D–
GND
33mF* +
0.01mF
VBUS
D+
D–
GND
33mF* +
0.01mF
VBUS
D+
D–
GND
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
Downstream
USB
Port 1
500mA max.
Downstream
USB
Port 2
500mA max.
Downstream
USB
Port 3
500mA max.
Downstream
USB
Port 4
500mA max.
2524/27_01.eps
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