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PDF MIC2026A Data sheet ( Hoja de datos )
| Número de pieza | MIC2026A | |
| Descripción | Dual-Channel Power Distribution Switch | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC2026A (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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MIC2026/2076
Micrel
MIC2026/2026A/2076/2076A
Dual-Channel Power Distribution Switch
General Description
The MIC2026 and MIC2076 are high-side MOSFET switches
optimized for general-purpose power distribution requiring
circuit protection.
The MIC2026/76 are internally current limited and have
thermal shutdown that protects the device and load.
The MIC2076 offers “smart” thermal shutdown that reduces
current consumption in fault modes. When a thermal shut-
down 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
employed.
A fault status output flag is asserted during overcurrent and
thermal shutdown conditions. Transient faults are internally
filtered.
The MIC2026/76 are available in 8-pin DIP or 8-lead SOP.
Features
• 140mΩ maximum on-resistance per channel
• 2.7V to 5.5V operating range
• 500mA minimum continuous current per channel
• Shortcircuit protection with thermal shutdown
• Thermally isolated channels
• Fault status flag with 3ms filter eliminates false asser-
tions (MIC2026A/2076A with 10ms filter)
• Undervoltwww.sony.com/clieage lockout
• Reverse current flow blocking (no “body diode”)
• Circuit breaker mode (MIC2076)
• Logic-compatible inputs
• Soft-start circuit
• Low quiescent current
• Pin compatible with MIC2526
Applications
• USB peripherals
• General purpose power switching
• ACPI power distribution
• Notebook PCs
• PDAs
• PC card hot swap
Typical Application
VCONT.
10k
10k
Logic Controller
VIN ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
VCC
2.7V to 5.5V
MIC2026-2
ENA
FLGA
FLGB
ENB
OUTA
IN
GND
OUTB
Load
0.1µF
Load
UL Recognized Component
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
February 1, 2001
1
MIC2026/2076
1 page  
MIC2026/2076
Supply On-Current
vs. Temperature
180
160
140 5V
120
100
80 3.3V
60
40
20
-040 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Supply On-Current
vs. Input Voltage
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)
Short-Circuit Current-Limit
vs. Temperature
1000
800 VIN = 3.3V
600
VIN = 5V
400
200
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Short-Circuit Current-Limit
vs. Input Voltage
800
700
600
500 +85°C +25°C
-40°C
400
300
200
100
02.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
February 1, 2001
On-Resistance
vs. Temperature
160
140
3.3V
120
100
5V
80
60
40 IOUT = 500mA
20
-040 -20 0 20 40 60 80 100
TEMPERATURE (°C)
On-Resistance
vs. Input Voltage
200
150 +85°C
+25°C
100
-40°C
50
IOUT = 500mA
02.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
1200
1000
Current-Limit Threshold
vs. Temperature
VIN = 5V
800 VIN = 3.3V
600
400
200
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Current-Limit Threshold
vs. Input Voltage
1200
1000
800 +85°C
600
+25°C
-40°C
400
200
02.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
5
Micrel
Turn-On Rise Time
vs. Temperature
5
4
3 RL=10Ω
CL=1µF
2 VIN = 3.3V
1
VIN = 5V
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Turn-On Rise Time
vs. Input Voltage
2.5
2.0
+85°C
1.5 +25°C
1.0 -40°C
0.5
02.5
RL=10Ω
CL=1µF
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
Fall Time
vs. Temperature
400
300
VIN = 3.3V
200
RL=10Ω
CL=1µF
100
0-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Fall Time
vs. Input Voltage
300
250
200
150
100
50
02.5
TA = 25°C
CL = 1µF
RL = 10Ω
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
MIC2026/2076
5 Page 
MIC2026/2076
Current Sensing and Limiting
The current-limit threshold is preset internally. The preset
level prevents damage to the device and external load but still
allows a minimum current of 500mA to be delivered to the
load.
The current-limit circuit senses a portion of the output MOSFET
switch current. The current-sense resistor shown in the block
diagram is virtual and has no voltage drop. The reaction to an
overcurrent condition varies with three scenarios:
Switch Enabled into Short-Circuit
If a switch is enabled into a heavy load or short-circuit, the
switch immediately enters into a constant-current mode,
reducing the output voltage. The FLG signal is asserted
indicating an overcurrent condition.
Short-Circuit Applied to Enabled Output
When a heavy load or short-circuit is applied to an enabled
switch, a large transient current may flow until the current-
limit circuitry responds. Once this occurs the device limits
current to less than the short-circuit current limit specification.
Current-Limit Response—Ramped Load
The MIC2026/76 current-limit profile exhibits a small foldback
effect of about 200mA. Once this current-limit threshold is
exceeded the device switches into a constant current mode.
It is important to note that the device will supply current up to
the current-limit threshold.
Micrel
Fault Flag
The FLG signal is an N-channel open-drain MOSFET output.
FLG is asserted (active-low) when either an overcurrent or
thermal shutdown condition occurs. In the case of an overcur-
rent condition, FLG will be asserted only after the flag
response delay time, tD, has elapsed. This ensures that FLG
is asserted only upon valid overcurrent conditions and that
erroneous error reporting is eliminated. For example, false
overcurrent conditions can occur during hot plug events
when a highly capacitive load is connected and causes a high
transient inrush current that exceeds the current-limit thresh-
old for up to 1ms. The FLG response delay time tD is typically
3ms (10ms the MIC2026A and MIC2027A).
Undervoltage LockMIC2026A/MIC2076Aout
Undervoltage lockout (UVLO) prevents the output MOSFET
from turning on until VIN exceeds approximately 2.5V. Under-
voltage detection functions only when the switch is enabled.
VEN
VOUT
ILIMIT
ILOAD
IOUT
VFLG
Short-Circuit Fault
3ms typ.
delay
Thermal
Shutdown
Reached
Load and Fault Removed
(Output Reset)
Figure 1. MIC2076-2 Fault Timing: Output Reset by Removing Load
VEN
VOUT
ILIMIT
ILOAD
IOUT
VFLG
February 1, 2001
Short-Circuit Fault
Load/Fault
Removed
3ms typ.
delay
Thermal
Shutdown
Reached
Figure 2. MIC2026-2 Fault Timing
11
MIC2026/2076
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MIC2026A.PDF ] | |
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