MIC2042 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – Single Channel, High Current, Low Voltage, Protected Power Distribution Switch

MIC2042/2043
Micrel
MIC2042/2043
Single Channel, High Current, Low Voltage,
Protected Power Distribution Switch
General Description
The MIC2042 and MIC2043 are high-side MOSFET switches
optimized for general purpose power distribution applications
which require circuit protection. The devices switch up to 5.5V
and as low as 0.8V while offering both programmable current
limiting and thermal shutdown to protect the device and the
load. A fault status output is provided in order to detect
overcurrent and thermal shutdown fault conditions. Both
devices employ soft-start circuitry to minimize the inrush
current in applications that employ highly capacitive loads.
Additionally, for tighter control over inrush current during
start-up, the output slew-rate may be adjusted by an external
capacitor.
The MIC2043 features a auto-reset circuit breaker mode that
latches the output off upon detecting an overcurrent condition
lasting more than 28ms. The output is reset by removing or
reducing the load.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Features
• 60mΩ max. on-resistance
• 0.8V to 5.5V operating range
• Adjustable current limit
• Power-Good detection
• Up to 3A continuous output current
• Short-circuit protection with thermal shutdown
• Adjustable slew-rate control
• Circuit breaker mode (MIC2043)
• Fault status flag
• Undervoltage lockout
• Output MOSFET reverse current flow block when
disabled
• Very fast reaction to short-circuits
• Low quiescent current
Applications
• Docking stations
• Notebook PCs
• PDAs
• Hot swap board insertions
• RAID controllers
• USB hosts
• ACPI power distribution
Typical Application
+3.3V
Power
Supply
OUT1 OUT2
C3
4.7µF
IN ^LogicON/OFF
Controller
OVERCURRENT
C1
0.1µF
C2
0.1µF
R1
20kΩ
MIC2042-1BTS
7 _{VBIAS VOUT} 10,11,14
8, 12 _VIN
PGREF ¹³
2
EN
3 _/FAULT
R4
20kΩ
9 _{SLEW PWRGD} 1
R2
294kΩ
1%
R3
24.3kΩ
1%
C_LOAD
33µF
V_OUT
3.3V@ 1.5A
MIC39100-2.5BS
IN
2.5V
EN
OUT
C4*
0.022µF
GND
6 _{ILIM UVLOIN} 4 _(OPEN)
R_SET
200Ω
GND
5
Note:
All V_IN pins (8, 12) must be externally tied together.
All V_OUT pins (10, 11, 14) must be externally tied together.
I_LIMIT ≅ 2A.
Output Power-Good = 3.0V.
*C4 is optional. See "Applications Information."
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2005
1
M0512-112603