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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
• 60mmax. 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
20k
MIC2042-1BTS
7 VBIAS VOUT 10,11,14
8, 12 VIN
PGREF 13
2
EN
3 /FAULT
R4
20k
9 SLEW PWRGD 1
R2
294k
1%
R3
24.3k
1%
CLOAD
33µF
VOUT
3.3V@ 1.5A
MIC39100-2.5BS
IN
2.5V
EN OUT
C4*
0.022µF
6 ILIM UVLOIN 4 (OPEN)
GND
RSET
200
GND
5
Note:
All VIN pins (8, 12) must be externally tied together.
All VOUT pins (10, 11, 14) must be externally tied together.
ILIMIT 2A.
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
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MIC2042/2043
Ordering Information
Part Number
Standard
Pb-Free
MIC2042-1BM
MIC2042-1YM
MIC2042-2BM
MIC2042-2YM
MIC2043-1BM
MIC2043-1YM
MIC2043-2BM
MIC2043-2YM
MIC2042-1BTS MIC2042-1YTS
MIC2042-2BTS MIC2042-2YTS
MIC2043-1BTS MIC2043-1YTS
MIC2043-2BTS MIC2043-2YTS
Enable
Active High
Active Low
Active High
Active Low
Active High
Active Low
Active High
Active Low
Circuit Breaker VBIAS
X
X
X
X
XX
XX
Micrel
VIN Range
1.6V to 5.5V
1.6V to 5.5V
1.6V to 5.5V
1.6V to 5.5V
0.8V to 5.5V
0.8V to 5.5V
0.8V to 5.5V
0.8V to 5.5V
Package
8-pin SOP
8-pin SOP
8-pin SOP
8-pin SOP
14-pin TSSOP
14-pin TSSOP
14-pin TSSOP
14-pin TSSOP
Pin Configuration
EN 1
/FAULT 2
GND 3
ILIM 4
8 VOUT
7 VIN
6 VOUT
5 VIN
8-Pin SOP (M)
PWRGD 1
EN 2
/FAULT 3
UVLOIN 4
GND 5
ILIM 6
VBIAS 7
14 VOUT
13 PGREF
12 VIN
11 VOUT
10 VOUT
9 SLEW
8 VIN
14-Pin TSSOP (TS)
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MIC2042/2043
Pin Description
Pin Number Pin Number
8-Pin SOP 14-Pin TSSOP
12
23
Pin Name
EN
/FAULT
35
N/A 9
GND
SLEW
46
ILIM
5,7 8,12
6,8 10,11,14
N/A 7
VIN
VOUT
VBIAS
N/A 13
PGREF
N/A 1 PWRGD
N/A 4 UVLOIN
Micrel
Pin Function
Switch Enable Input: Gate control pin of the output MOSFET available as an
active high (–1) or active low (–2) input signal.
Fault Status Output: Open-drain N-Channel device, active low. This pin
indicates an overcurrent or thermal shutdown condition. For an overcurrent
event, /FAULT is asserted if the duration of the overcurrent condition lasts
longer than 28ms.
Ground Connection: Tie to analog ground.
Slew-Rate Control Input: A capacitor connected between this pin and ground
will reduce (slow) the output slew-rate. The output turn-on time must be less
than the nominal flag delay of 28ms in order to avoid nuisance tripping of the
/FAULT output since VOUT must be “fully on” (i.e., within 200mV of the voltage
at the input) before the /FAULT signal delay elapses. The capacitor requires a
16V rating, or greater, 25V is recommended. See “Applications Information,”
“Output Slew-Rate Adjustment” for further detail.
Current Limit Set: A resistor, RSET, connected to this pin sets the current
limit threshold as CLF/RSET, 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.
Switch Input Supply: The drain of the output MOSFET. The range of input for
the switch is 0.8V to 5.5V. These pins must be externally connected together
to achieve rated performance.
Switch Output: The source of the output MOSFET. These pins must be
externally connected together to achieve rated performance.
Bias Supply Input: This input pin supplies power to operate the switch and
internal circuitry. The input range for VBIAS is 1.6V to 5.5V. When switched
voltage (VIN) is between 1.6V to 5.5V and the use of a single supply is desired,
connect VBIAS to VIN externally.
Power-Good Threshold (Input): Analog reference used to specify the
PWRGD threshold. When the voltage at this pin exceeds its threshold, VTH,
PWRGD is asserted high. An external resistive divider network is used to
determine the output voltage level at which VTH is exceeded. See
“Functional Description” for further detail. When the PWRGD signal is not
utilized, this input should be tied to VOUT.
Power-Good Output: Active high, open-drain. This pin asserts high when the
voltage at PGREF exceeds its threshold.
Undervoltage Lockout Adjust Input: With this pin left open, the UVLO
threshold is internally set to 1.45V. When the switching voltage (VIN) is below
1.6V, connecting an external resistive divider to this input will lower the
UVLO threshold. The total resistance of the divider must be less than
200k. See “Applications Information” for further detail.
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MIC2042/2043
Absolute Maximum Ratings(1)
Supply Voltage
VIN and VBIAS ............................................................................. 6V
/FAULT, PWRGD Output Voltage ................................... 6V
/FAULT, PWRGD Output Current .............................. 25mA
Junction Temperature (TJ) ...................... Internally Limited
ESD Rating(3)
Human Body Model ................................................... 3kV
Machine Model ........................................................ 200V
Micrel
Operating Ratings(2)
Supply Voltage
VIN ............................................................... 0.8V to 5.5V
VBIAS ........................................................... 1.6V to 5.5V
Continuous Output Current ................................ 0.5A to 3A
Ambient Temperature (TA) ........................... –40°C to 85°C
Package Thermal Resistance
SOP (θJA) .......................................................... 160°C/W
TSSOP (θJA) ....................................................... 85°C/W
Electrical Characteristics(4)
VIN = VBIAS = 5V; TA = 25°C unless specified otherwise. Bold indicates –40°C to +85°C.
Symbol
Parameter
Condition
VIN Switch Input Voltage
VIN VBIAS
14-pin TSSOP
8-pin SOP
VBIAS
IBIAS
Bias Supply Voltage
(14-pin TSSOP)
VBIAS Supply Current - Switch OFF No load
VBIAS Supply Current - Switch ON No load
Note 5
VEN
VENHYST
IEN
RDS(ON)
ILEAK
CLF
VTH
Enable Input Voltage
Enable Input Threshold Hysteresis
Enable Input Current
Switch Resistance
Output Leakage Current
Current Limit Factor(2)
PGREF and UVLOIN Threshold
VIL(max)
VIH(min)
VEN = 0V to 5.5V
VIN = VBIAS = 3V, 5V
IOUT = 500mA
Output off
VIN = 5V, 0.5V VOUT < 0.5VIN
0.5A IOUT 3A
VIN = 3V, 0.5V VOUT < 0.5VIN
0.5A IOUT 3A
VIN = VBIAS = 1.6V to 5.5V
(14-pin TSSOP)
VLATCH
ILATCH
VOL
IOFF
VUV
VUVHYST
Output Reset Threshold
Latched Output Off Current
Output Low Voltage
(/FAULT, PWRGD)
/FAULT, PWRGD Off Current
Undervoltage Lockout Threshold
Undervoltage Lockout
Threshold Hysteresis
VIN = 0.8V to 5.5V
VOUT rising (MIC2043)
Output latched off (MIC2043)
IOL (/FAULT) = 15mA
IOL (PWRGD) = 5mA
VFAULT = VPWRGD = 5V
VIN rising
VIN falling
VUVINTH
VUVINHYST
UVLO Adjust Pin Threshold Voltage
UVLO Adjust Pin Threshold Hysteresis
VIN rising
VIN falling
Overtemperature Threshold
TJ increasing
TJ decreasing
Min
0.8
1.6
1.6
3.5
–1
310
320
205
1
1.30
1.20
205
185
Typ Max
5.5
5.5
5.5
0.1 5
300 400
2.4 1.5
2.5
100
.01 1
40 60
10
395 485
385 450
225 245
VIN–.0.2
35
0.4
1
1.45 1.58
1.35 1.50
100
225 245
205 225
20
140
120
Units
V
V
V
µA
µA
V
V
mV
µA
m
µA
A×
A×
mV
V
mA
V
µA
V
V
mV
mV
mV
mV
°C
°C
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MIC2042/2043
Micrel
Symbol
Parameter
Condition
Min Typ Max Units
tFLAG
tON
tR
tOFF
tF
Flag Response Delay
Output Turn-on Delay
Output Turn-on Rise Time
Output Turn-off Delay
Output Turn-off Fall Time
VIN = VBIAS = 3V, 5V
RLOAD = 10, CLOAD = 1µF
RLOAD = 10, CLOAD = 1µF
RLOAD = 10, CLOAD = 1µF
RLOAD = 10, CLOAD = 1µF
21 28 35 ms
600 800 1000 µs
1 1.5 2 ms
1 5 µs
24 µs
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
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 VEN < 1.0V for MIC2042/MIC2043-1 and VEN > 4.0V for MIC2042/MIC2043-2. ON is VEN > 4.0V for MIC2042/MIC2043-1 and VEN < 1.0V for
MIC2042/MIC2043-2.
6. The current limit is determined as follows: ILIM = CLF/RSET.
Timing Diagrams
VEN 0
VOUT 0
50%
tON
10%
(a) MIC2042/43-1
tOFF
90%
January 2005
VEN 0
VOUT 0
50%
tON
tOFF
10%
(b) MIC2042/43-2
Figure 1. Turn-On/Turn-Off Delay
90%
VEN 0
VIN 0.2V
VOUT 0
ILIMIT
IOUT 0
Increase the load
tFLAG
/FAULT 0
Figure 2. Overcurrent Fault Response — MIC2042-2
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