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PDF MIC2075 Data sheet ( Hoja de datos )
| Número de pieza | MIC2075 | |
| Descripción | Single-Channel Power Distribution Switch MM8 | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC2075 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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MIC2025/2075
MIC2025/2075
Micrel, Inc.
Single-Channel Power Distribution Switch MM8®
General Description
The MIC2025 and MIC2075 are high-side MOSFET switches
optimized for general-purpose power distribution requiring
circuit protection.
The MIC2025/75 are internally current limited and have
thermal shutdown that protects the device and load. The
MIC2075 offers “smart” thermal shutdown that reduces cur-
rent consumption in fault modes. When a thermal shutdown
fault occurs, the output is latched off until the faulty load is
removed. Removing the load or toggling the enable input will
reset the device output.
Both devices employ soft-start circuitry that minimizes inrush
current in applications where highly capacitive loads are em-
ployed. A fault status output flag is provided that is asserted
during overcurrent and thermal shutdown conditions.
The MIC2025/75 is available in the MM8® 8‑lead MSOP
and 8‑lead SOP.
Features
• 140mΩ maximum on-resistance
• 2.7V to 5.5V operating range
• 500mA minimum continuous output current
• Short-circuit protection with thermal shutdown
• Fault status flag with 3ms filter eliminates false asser-
tions
• Undervoltage lockout
• Reverse current flow blocking (no “body diode”)
• Circuit breaker mode (MIC2075) reduces power
consumption
• Logic-compatible input
• Soft-start circuit
• Low quiescent current
• Pin-compatible with MIC2525
• UL File # E179633
Applications
• USB peripherals
• General purpose power switching
• ACPI power distribution
• Notebook PCs
• PDAs
• PC card hot swap
Typical Application
10k
Logic Controller
VIN ON/OFF
1µF OVERCURRENT
GND
VCC
2.7V to 5.5V
MIC2025/75
EN
FLG
GND
NC
OUT
IN
OUT
NC
Load
0.1µF
UL Recognized Component
MM8 is a registered trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2010
1 MIC2025/2075
1 page  
MIC2025/2075
Micrel, Inc.
S upply On-C urrent
vs . T emperature
180
160
140
120 5V
100
80
60 3.3V
40
20
-040 -20 0 20 40 60 80 100
TEMPERATURE (°C)
S upply On-C urrent
vs . Input V oltage
200
150
-40°C
100
50 +85°C
+25°C
02.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
S hort-C irc uit C urrent-L imit
vs . T emperature
1000
800 V IN = 3.3V
600
400 V IN = 5V
200
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
S hort-C irc uit C urrent-L imit
vs . Input V oltage
800
700 +25°C
600
500
+85°C
-40°C
400
300
200
100
02.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
On-R es is tanc e
vs . T emperature
160
140
120 3.3V
100
5V
80
60
40 IOUT = 500mA
20
-040 -20 0 20 40 60 80 100
TEMPERATURE (°C)
On-R es is tanc e
vs . Input V oltage
200
150
+85°C
100 +25°C
50 -40°C
IOUT = 500mA
02.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
C urrent-L imit T hres hold
1200
vs . T emperature
1000
800
600
VIN = 3.3V
VIN = 5V
400
200
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
C urrent-L imit T hres hold
1200
vs . Input V oltage
1100
1000
900
800
700
600 +85°C +25°C
-40°C
500
400
300
200
100
02.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
T urn-On R is e T ime
vs . T emperature
5
4 VIN = 3.3V
3
2 VIN = 5V
1 R L=10Ω
C L=1µF
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
T urn-On R is e T ime
vs . Input V oltage
5.0
4.0 +85°C
3.0
-40°C
2.0
+25°C
1.0
02.5
R L=10Ω
C L=1µF
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
E nable Thres hold
vs . T emperature
2.5
2.0
VE N R IS ING
1.5
VEN FALLING
1.0
0.5
-040
VIN = 5V
-20 0 20 40 60 80
TEMPERATURE (°C)
100
E nable Thres hold
vs . Input V oltage
2.5
2.0
VE N R IS ING
1.5
VEN FALLING
1.0
0.5
02.5
T A = 25°C
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
June 2010
5 MIC2025/2075
5 Page 
MIC2025/2075
Applications Information
Supply Filtering
A 0.1µF to 1µF bypass capacitor positioned close to VIN and
GND of the device is strongly recommended to control sup-
ply transients. Without a bypass capacitor, an output short
may cause sufficient ringing on the input (from supply lead
inductance) to damage internal control circuitry.
Printed Circuit Board Hot-Plug
The MIC2025/75 are ideal inrush current-limiters suitable for
hot-plug applications. Due to the integrated charge pump,
the MIC2025/75 presents a high impedance when off and
slowly becomes a low impedance as it turns on. This “soft-
start” feature effectively isolates power supplies from highly
capacitive loads by reducing inrush current during hot-plug
events. Figure 3 shows how the MIC2075 may be used in a
hot-plug application.
In cases of extremely large capacitive loads (>400µF), the
length of the transient due to inrush current may exceed the
delay provided by the integrated filter. Since this inrush cur-
rent exceeds the current-limit delay specification, FLG will
be asserted during this time. To prevent the logic controller
from responding to FLG being asserted, an external RC filter,
as shown in Figure 4, can be used to filter out transient FLG
assertion. The value of the RC time constant will be selected
to match the length of the transient.
Micrel, Inc.
Universal Serial Bus (USB) Power Distribution
The MIC2025/75 is ideally suited for USB (Universal Serial
Bus) power distribution applications. The USB specification
defines power distribution for USB host systems such as
PCs and USB hubs. Hubs can either be self-powered or
bus-powered (that is, powered from the bus). Figure 5 below
shows a typical USB Host application that may be suited for
mobile PC applications employing USB. The requirements
for USB host systems is that the port must supply a minimum
of 500mA at an output voltage of 5V ±5%. In addition, the
output power delivered must be limited to below 25VA. Upon
an overcurrent condition, the host must also be notified. To
support hot-plug events, the hub must have a minimum of
120µF of bulk capacitance, preferably low-ESR electrolytic
or tantulum. Refer to Application Note 17 for more details on
designing compliant USB hub and host systems.
For bus-powered hubs, USB requires that each downstream
port be switched on or off under control by the host. Up to four
downstream ports each capable of supplying 100mA at 4.4V
minimum are allowed. In addition, to reduce voltage droop on
the upstream VBUS, soft-start is necessary. Although the hub
can consume up to 500mA from the upstream bus the hub
must consume only 100mA max at start-up, until it enumer-
ates with the host prior to requesting more power. The same
requirements apply for bus-powered peripherals that have no
downstream ports. Figure 6 shows a bus-powered hub.
June 2010
VC C
to "Hot"
Receptacle
GND
MIC2025-2
1 EN
OUT 8
0.1 2 FLG
µF 3 GND
IN 7
OUT 6
4 NC
NC 5
Adaptor Card
Backend
Function
CB U L K
Figure 3. Hot Plug Application
Logic Controller
OVERCURRENT
V+
10k
R
C
MIC2025
1 EN
OUT 8
2 FLG
IN 7
3 GND OUT 6
4 NC
NC 5
Figure 4. Transient Filter
11
MIC2025/2075
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MIC2075.PDF ] | |
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