Micrel MIC2042 Manual
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Micrel MIC2042 Manual

Single channel, high current, low voltage, protected power distribution switch
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MIC2042/2043
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.
Typical Application
+3.3V
Power
Supply
OUT1
OUT2
Logic
IN
Controller
OVERCURRENT
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
January 2005
0.1µF
C1
0.1µF
C3
R1
4.7µF
20kΩ
ON/OFF
C4*
0.022µF
Single Channel, High Current, Low Voltage,
Protected Power Distribution Switch
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
C2
MIC2042-1BTS
7
10,11,14
VBIAS
VOUT
8, 12
13
VIN
PGREF
2
EN
R4
20kΩ
3
/FAULT
9
1
SLEW
PWRGD
6
4
ILIM
UVLOIN
(OPEN)
R
GND
SET
200Ω
5
Note:
All V
All V
I
LIMIT
Output Power-Good = 3.0V.
*C4 is optional. See "Applications Information."
1
MIC2042/2043
3.3V@ 1.5A
R2
C
294kΩ
LOAD
33µF
1%
R3
24.3kΩ
1%
MIC39100-2.5BS
IN
EN
OUT
GND
pins (8, 12) must be externally tied together.
IN
pins (10, 11, 14) must be externally tied together.
OUT
≅ 2A.
Micrel
V
OUT
2.5V
M0512-112603

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Summary of Contents for Micrel MIC2042

  • Page 1 Output Power-Good = 3.0V. *C4 is optional. See "Applications Information." Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com January 2005 M0512-112603...

  • Page 2: Ordering Information

    MIC2042/2043 Micrel Ordering Information Part Number Standard Pb-Free Enable Circuit Breaker Range Package BIAS MIC2042-1BM MIC2042-1YM Active High 1.6V to 5.5V 8-pin SOP MIC2042-2BM MIC2042-2YM Active Low 1.6V to 5.5V 8-pin SOP MIC2043-1BM MIC2043-1YM Active High 1.6V to 5.5V 8-pin SOP...

  • Page 3: Pin Description

    , connected to this pin sets the current limit threshold as CLF/R , where CLF is the current limit factor specified in the “Electrical Characteristics” table. For the MIC2042/43, the continuous output current range is 0.5A to 3A. 8,12 Switch Input Supply: The drain of the output MOSFET. The range of input for the switch is 0.8V to 5.5V.

  • Page 4: Absolute Maximum Ratings

    MIC2042/2043 Micrel Absolute Maximum Ratings Operating Ratings Supply Voltage Supply Voltage and V ............... 0.8V to 5.5V BIAS ................/FAULT, PWRGD Output Voltage ........6V ............1.6V to 5.5V BIAS /FAULT, PWRGD Output Current ......25mA Continuous Output Current ........ 0.5A to 3A Junction Temperature (T ) ......

  • Page 5: Timing Diagrams

    3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Specification for packaged product only. 5. OFF is V < 1.0V for MIC2042/MIC2043-1 and V > 4.0V for MIC2042/MIC2043-2. ON is V > 4.0V for MIC2042/MIC2043-1 and V < 1.0V for MIC2042/MIC2043-2.

  • Page 6: Test Circuit

    MIC2042/2043 Micrel Test Circuit MIC2042/43-xBTS LOAD 10,11,14 VBIAS VOUT LOAD 260k 8, 12 PGREF /FAULT UVLOIN PWRGD SLEW ILIM SLEW uses multiple values SLEW (See specific response plots) January 2005 M0512-112603...

  • Page 7: Typical Characteristics

    MIC2042/2043 Micrel Typical Characteristics Enable Input Threshold Enable Input Threshold (Falling) (Rising) Supply Current vs. Temperature vs. Temperature vs. Temperature = 5.5V = 5.5V BIAS BIAS = 5.5V BIAS = 3V = 3V BIAS BIAS = 3V BIAS = 1.6V = 1.6V...

  • Page 8: Functional Characteristics

    MIC2042/2043 Micrel Functional Characteristics 5V Turn-On 5V Turn-Off = 5.0V LOAD = 47 = 5.0V LOAD BIAS = 2.8 LOAD = 22 LOAD TIME (1ms/div.) TIME (250 s/div.) Latched Output Latched Output Reset (MIC2043) (MIC2043) 4.84V = 5.0V toggles from 2...
  • Page 9 MIC2042/2043 Micrel Output Slew Response Thermal Shutdown Response = 5.0V = 2.8 = 5.0V LOAD = 22 LOAD LOAD = 0.033 = 47 SLEW LOAD TIME (2.5ms/div.) TIME (100ms/div.) January 2005 M0512-112603...

  • Page 10: Functional Diagram

    Power-Off Reset Thermal Shutdown PGREF 10,11,14 VOUT 5.3x Gate Replica UVLO Control UVLOIN Current SLEW Limit ILIM Delay Charge (28ms) Pump Input Power-On Latch Open Logic Reset (MIC2043) Load Detect /FAULT Error Flag Logic MIC2042/43 Block Diagram January 2005 M0512-112603...

  • Page 11: Functional Description

    (CLF) divided by R conditions. and the MIC2042/43 will limit from 0.5A to 3A with a set point Input and Output accuracy of ±22%. In programming the nominal current limit,...
  • Page 12 Using the typical applications circuit from page 1 that switches 120°C. If the fault is still present, the MIC2042 will quickly re- 3.3V as an example, the output voltage threshold determin- heat and shut down again.

  • Page 13: Applications Information

    22µF is strongly recommended and should be from UVLOIN to GND may be used as a glitch filter in order placed close to the VOUT pin of the MIC2042. For applica- to avoid nuisance tripping of the UVLO threshold. If the...
  • Page 14 The following list contains some useful Power dissipation depends on several factors such as the suggestions for PCB layout design of the MIC2042/43 in load, PCB layout, ambient temperature, and package type. order to prevent the die from overheating under normal...

  • Page 15: Package Information

    The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.

This manual is also suitable for:

Mic2043Mic2043-2ymMic2043-2btsMic2042-1bmMic2043-1bts-trMic2042-1yts ... Show all

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