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