IMP2527 IMP Inc, IMP2527 Datasheet
IMP2527
Manufacturer Part Number
IMP2527
Description
Quad USB High-Side Power Switch with Fault Detection
Manufacturer
IMP Inc
Datasheet
1.IMP2527.pdf
(4 pages)
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
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 0.07Ω switch resistance. For dual-switch applications, refer to
the IMP2526 data sheet.
©
5.1V
IMP2527
IMP2524
5V
5V
1999 IMP, Inc.
Typical Application
or
±
±
±
1%
3%
3%
Bold/Blue
*33
4.7
m
F, 16V tantalum or 100
m
F
+
lines indicate 0.1" wide, 1-oz. copper high-current traces.
IN
Data
LDO
GND
OUT
m
F, 10V electrolytic per port
1
m
V +
OVERCURRENT
USB Controller
D+
D–
F
GND
10k
ON/OFF
27k
2
1
3
4
5
6
7
8
ENA
FLGA
ENB
FLGB
ENC
FLGC
END
FLGD
IMP2524
IMP2527
OUTA
OUTB
OUTC
OUTD
INC/D
INA/B
GND
GND
408-432-9100/www.impweb.com
16
15
14
13
12
11
10
9
33
33
33
33
0.1
Ferrite Bead
m
m
m
m
F*
F*
F*
F*
m
F
+
+
+
+
0.01
0.01
0.01
0.01
m
m
m
m
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
N 500mA continuos load current per switch
N Low supply current
N 1.25A maximum current limit, 750mA typical
N Thermal shutdown 2.4V undervoltage lockout
N Open-drain flag output
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
N USB host and self-powered hubs
N USB video monitors
N USB printers
F
F
F
F
– IMP2524: 0.1Ω, 0.14Ω maximum
– IMP2527: 0.2Ω, 0.3Ω maximum
– 110µA ON-state current, 0.75µA OFF-state
(UVLO)
– Undervoltage
– Current limit
– Thermal shutdown
MIC2527
V
GND
V
GND
V
GND
V
GND
BUS
BUS
BUS
BUS
D–
D–
D–
D–
D+
D+
D+
D+
current
IMP252
IMP252
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
Key Features
Applications
4/2
4/2
7
7
1
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IMP2527 Summary of contents
Page 1
... 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 The IMP2524/2527 conform to the new USB 1 ...
Page 2
Pin Configuration FLGA 1 16 FLGB ENA 2 15 ENB OUTA 3 14 OUTB IMP2524/27 GND 4 13 INA/B INC GND OUTC 6 11 OUTD ENC 7 10 END FLGC 8 9 Pin Descriptions ...
Page 3
... LOW to HIGH (“0” to “1”) Enable Voltage, Note 1 HIGH to LOW (“1” to “0”) Enable Voltage, Note 2. 0.8V EN IMP2524 500mA each switch OUT IMP2527 500mA each switch OUT Each output R = 10Ω each output 10Ω each output 10Ω each output ...
Page 4
IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Tel: 800-438-3722 Fax: 408-434-0335 e-mail: info@impinc.com http://www.impweb.com The IMP ...