MIC2033 - Micrel

MIC2033
High-Accuracy, High-Side, Fixed
Current Limit Power Switch
General Description
Features
The MIC2033 is a high-side MOSFET power distribution
switch providing increased system reliability utilizing 5%
current limit accuracy.
The MIC2033 has an operating input voltage range from
2.5V to 5.5V, is internally current limited and has thermal
shutdown to protect the device and system. The MIC2033
is offered with either active-high or active-low logic level
enable input controls, has an open drain fault status output
flag with a built-in 32ms delay that asserts low during over
current or thermal shutdown conditions.
The MIC2033 is available in several different fixed current
limit options: 0.5A, 0.8A, 1A, and 1.2A. A capacitor
adjustable soft-start circuit minimizes inrush current in
applications where high capacitive loads are used.
The MIC2033 is offered in both 6-pin SOT-23 and 6-pin
2mm x 2mm thin DFN packages. The MIC2033 has an
operating junction temperature range of 40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
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
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

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

±5% current limit accuracy
Input supply range from 2.5V to 5.5V
Low quiescent current: 100µA typical (switch ON)
75mΩ typical RDS(ON) at 5V
Current limit options: 0.5A, 0.8A, 1A, and 1.2A
Soft-start control via an external capacitor
Undervoltage lockout (UVLO)
Fast response time (10µs) to short circuit loads
Fault status output flag
Logic controlled enable (active-high, active-low)
Thermal shutdown
Pin compatible with MIC2005
6-pin 2mm  2mm thin DFN and 6-pin SOT-23
packages
 Junction temperature range from 40°C to +125°C
Applications




USB peripherals and USB 2.0/3.0 compatible
DTV/STB
Notebooks and consumer electronics
General purpose power distribution
____________________________________________________________________________________________________________
Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2012
M9999-082012-A
Micrel, Inc.
MIC2033
Ordering Information
Part Number
Top Mark
Current Limit
Enable
Package
MIC2033-05AYM6
35A
0.5A
Active High
SOT-23-6L
MIC2033-05BYM6
35B
0.5A
Active Low
SOT-23-6L
MIC2033-05AYMT
3A5
0.5A
Active High
6-pin 2mm x 2mm Thin DFN
MIC2033-05BYMT
3B5
0.5A
Active Low
6-pin 2mm x 2mm Thin DFN
MIC2033-55AYM6*
55A
0.55A
Active High
SOT-23-6L
MIC2033-55AYMT*
5A5
0.55A
Active High
6-pin 2mm x 2mm Thin DFN
MIC2033-08AYM6
38A
0.8A
Active High
SOT-23-6L
MIC2033-08BYM6
38B
0.8A
Active Low
SOT-23-6L
MIC2033-08AYMT
3A8
0.8A
Active High
6-pin 2mm x 2mm Thin DFN
MIC2033-08BYMT
3B8
0.8A
Active Low
6-pin 2mm x 2mm Thin DFN
MIC2033-10AYM6
31A
1.0A
Active High
SOT-23-6L
MIC2033-10BYM6
31B
1.0A
Active Low
SOT-23-6L
MIC2033-10AYMT
3A1
1.0A
Active High
6-pin 2mm x 2mm Thin DFN
MIC2033-10BYMT
3B1
1.0A
Active Low
6-pin 2mm x 2mm Thin DFN
MIC2033-12AYM6
32A
1.2A
Active High
SOT-23-6L
MIC2033-12BYM6
32B
1.2A
Active Low
SOT-23-6L
MIC2033-12AYMT
3A2
1.2A
Active High
6-pin 2mm x 2mm Thin DFN
MIC2033-12BYMT
3B2
1.2A
Active Low
6-pin 2mm x 2mm Thin DFN
Notes:
1.
Under bar symbol ( _ ) may not be to scale.
2.
Thin DFN is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
3.
* Contact Micrel for availability.
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MIC2033
Pin Configuration
SOT-23 6-Lead (M6)
2mm x 2mm 6-pin Thin DFN (MT)
Top View
Top View
Notes:
1.
Thin DFN ▲ = Pin 1 identifier.
Pin Description
Pin Number
SOT-23-6L
6-pin
2mmx2mm
Thin DFN
Pin
Name
1
6
VIN
Input: Power switch and logic supply input.
2
5
GND
Ground: Input and output return pin.
3
4
EN
Pin Function
Enable (Input): Logic compatible, enable control input that allows turn-on/-off of
the switch. Do not leave the EN pin floating.
4
3
FAULT/
Fault Status Flag (Output): Active-low, open-drain output. A logic LOW state
indicates an over current or thermal shutdown condition. An over current condition
must last longer than tFAULT/ in order to assert FAULT/. A pull-up resistor (10kΩ
recommended) to an external supply is required.
5
2
CSLEW
Slew Rate Control: Adjustable soft-start input. Adding a small value capacitor from
CSLEW to VIN slows the turn-on time of the power MOSFET.
6
1
VOUT
Switch Output: Power switch output.
—
EP
ePad
Exposed Pad: Exposed pad on bottom side of package. Connect to electrical
ground for optimum thermal dissipation.
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MIC2033
Absolute Maximum Ratings(1)
Operating Ratings(3)
VIN to GND....................................................... 0.3V to +6V
VOUT to GND ...................................................... 0.3V to VIN
VCSLEW to GND................................................. 0.3V to +6V
VEN to GND...................................................... 0.3V to +6V
VFAULT/ to GND................................................. 0.3V to +6V
FAULT/ Current (IFAULT/) ..............................................25mA
Maximum Power Dissipation (PD) .............Internally Limited
Lead Temperature (soldering, 10 sec.)...................... 260°C
Storage Temperature (TS).........................65°C to +150°C
ESD Rating(2)
HBM ......................................................................... 3kV
MM .........................................................................300V
Supply Voltage (VIN)..................................... +2.5V to +5.5V
VEN, VFAULT/ ................................................... 0.3V to +5.5V
VCSLEW, VOUT ...................................................... 0.3V to VIN
Ambient Temperature Range (TA) .............. –40°C to +85°C
Junction Temperature (TJ) ........................ –40°C to +125°C
Package Thermal Resistance
SOT-23-6 (JA) ..............................................177.2°C/W
6-pin 2mm  2mm DFN (JA) .............................90°C/W
Electrical Characteristics(4)
VIN = VEN = 5V; CIN = 1µF; CCSLEW = 0.1µF; COUT = 1µF; TJ = 25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
5.5
V
V
Power Supply Input
VIN
VUVLO
VUVLOHYS
2.5
Input Voltage Range
Input Supply Under-voltage
Lockout Threshold
Input Supply Under-voltage
Lockout Threshold Hysteresis
VIN rising
2.0
2.25
2.5
VIN falling
1.9
2.15
2.4
VIN rising or VIN falling
Switch
OFF
IDD
100
Active High Enable (A): VEN = 0V,
VIN = 5V
(IOUT = 0A)
Active Low Enable (B): VEN = VIN = 5V
Switch ON
Active High Enable (A): VEN = 1.5V,
VIN = 5V
Supply Current
0.75
mV
5
µA
100
300
VIN = 2.5V, IOUT = 350mA
100
177
VIN = 3.3V, IOUT = 350mA
85
145
VIN = 5V, IOUT = 350mA
75
125
0.22
15
0.475
0.50
0.525
0.517
0.550
0.578
MIC2033-08xxxx, VOUT = 0.8 x VIN
0.76
0.80
0.84
MIC2033-10xxxx, VOUT = 0.8 x VIN
0.95
1.00
1.05
MIC2033-12xxxx, VOUT = 0.8 x VIN
1.14
1.20
1.26
(IOUT = 0A)
Active Low Enable (B): VEN = 0V,
VIN = 5V
Power MOSFET
RDS(ON)
ILKG
Switch On-Resistance
Output Leakage Current
Switch Off, VOUT = 0V
mΩ
µA
Current Limit
MIC2033-05xxxx, VOUT = 0.8 x VIN
MIC2033-55xxx, VOUT = 0.8 x
ILIMIT
Current Limit
VIN(5)
A
I/O
0.5
Logic Low
VEN
Enable Voltage
August 2012
1.5
Logic High
4
V
M9999-082012-A
Micrel, Inc.
IEN
MIC2033
Enable Input Current
0V ≤ VEN ≤ 5V
(4)
Electrical Characteristics
Parameter
Condition
RFAULT/
FAULT/ Output Resistance
ICSLEW
µA
(Continued)
Symbol
IFAULT/_OFF
1
Min.
Typ.
Max.
Units
IOUT = 10mA
25
Ω
FAULT/ Off Current
VFAULT/ = VIN
10
µA
CSLEW Input Current
VCSLEW = VIN
0.6
µA
TJ Rising
157
°C
15
°C
RLOAD = 10Ω; COUT = 1µF
700
µs
Thermal Protection
TSD
Thermal Shutdown Threshold
TSDHYS
Thermal Shutdown Hysteresis
Timing Specifications (AC Parameters)
tRISE
tFALL
tON_DLY
Output Turn-on Rise Time(6)
(6)
Output Turn-off Fall Time
VEN = OFF; RLOAD = 10Ω; COUT = 1µF
32
µs
(6)
RLOAD = 10Ω; COUT = 1µF
700
µs
(6)
Output Turn-on Delay
tOFF_DLY
Output Turn-off Delay
RLOAD = 10Ω; COUT = 1µF
5
µs
tSC_RESP
Short Circuit Response
Time(6)
VOUT = 0V (short circuit)
10
µs
tFAULT/
Over-current Fault Response
(6)
Delay Time
16
32
49
ms
Notes:
1.
Exceeding the absolute maximum rating may damage the device.
2.
Devices are ESD sensitive. Handling precautions recommended. Human body model (HBM), 1.5kΩ in series with 100pF.
3.
The device is not guaranteed to function outside its operating rating.
4.
Specification for packaged product only.
5.
Preliminary.
6.
See Timing Diagrams (Figures 1-3).
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MIC2033
Timing Diagrams
V
EN
0
tFALL
tRISE
90%
VOUT
90%
10%
10%
0
t
Figure 1. Output Rise/Fall Time
V
EN
50%
50%
0
tON_DLY
tOFF_DLY
90%
VOUT
10%
0
t
Figure 2. Turn-On/Off Delay
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MIC2033
Figure 3. Short Circuit Response Time and Over Current Fault Flag Delay
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MIC2033
Typical Characteristics
Input Supply Current
vs. Temperature
VIN OFF Current
vs. Temperature
IOUT = 0mA
150
125
100
75
50
25
0
VIN = 5V
1.25
VEN = OFF
IOUT = 0mA
1.00
0.75
0.50
-25
0
125
25
50
75
100
-25
0
25
50
75
100
-50
125
75
100
RDS(ON)
vs. Output Current
125
125
IOUT = 350mA
MIC2033-12xx
75
50
25
50
75
100
125
-25
0
25
50
75
100
TEMPERATURE (°C)
RDS(ON)
vs. Output Current
RDS(ON)
vs. Output Current
125
V IN = 3.3V
50
0
400
OUTPUT CURRENT (mA)
500
300
400
500
VIN = 3.3V
TA = 25°C
MIC2033-12xx
100
75
50
0
0.00
200
RDS(ON)
vs. Output Current
125
25
25
100
OUTPUT CURRENT (mA)
RDS (ON) (mΩ)
RDS (ON) (mΩ)
100
75
300
0
125
VIN = 5V
TA = 25°C
MIC2033-05xx
200
50
0
-50
TEMPERATURE (°C)
100
75
25
0
0
TA = 25°C
MIC2033-05xx
100
RDS (ON) (mΩ)
RDS (ON) (mΩ)
RDS (ON) (mΩ)
100
125
VIN = 5V
V IN = 5V
0
August 2012
50
RDS(ON)
vs. Temperature
25
100
25
RDS(ON)
vs. Temperature
25
0
0
TEMPERATURE (°C)
50
125
-25
TEMPERATURE (°C)
75
-25
1.75
TEMPERATURE (°C)
IOUT = 350mA
MIC2033-05xx
-50
VIN Falling
2.00
1.50
-50
125
VIN = 5V
100
VIN Rising
2.25
0.25
0.00
-50
RDS (ON) (mΩ)
UVLO THRESHOLD (V)
SUPPLY OFF CURRENT (µA)
V IN = 5V
175
SUPPLY CURRENT (µA)
2.50
1.50
200
Undervoltage Lockout
vs. Temperature
TA = 25°C
MIC2033-12xx
75
50
25
0.25
0.50
0.75
1.00
OUTPUT CURRENT (A)
8
1.25
0
0.00
0.25
0.50
0.75
1.00
OUTPUT CURRENT (A)
M9999-082012-A
1.25
Micrel, Inc.
MIC2033
Typical Characteristics (Continued)
Current Limit
vs. Temperature
Current Limit
vs. Temperature
1200
600
1.50
VIN = 5V
V OUT = 4V
MIC2033-05xx
550
500
450
1000
800
600
VIN = 5V
400
VOUT = 4V
MIC2033-08xx
200
-50
-25
0
25
50
75
100
-20
Current Limit
vs. Temperature
70
100
130
-50
1.15
-25
0
25
50
75
100
100
30
20
100
V IN = 5V
IFLAG = 10mA
20
200
300
400
500
OUTPUT CURRENT (mA)
FAULT/ RESPONSE TIME (ms)
25
15
10
5
TA = 25°C
MIC2033-12xx
75
50
0
0.00
0.25
0.50
0.75
1.00
OUTPUT CURRENT (A)
FAULT/ Response Time
vs. Temperature
50
VIN = 5V
MIC2033-xxxx
40
30
20
10
0
0
-50
-25
0
25
50
75
TEMPERATURE (°C)
August 2012
100
125
130
25
TEMPERATURE (°C)
FAULT/ Pin Resistance
vs. Temperature
100
VIN = 5V
TA = 25°C
MIC2033-05xx
0
125
70
VIN - VOUT
vs. Output Current
0
-50
40
VIN - VOUT
vs. Output Current
10
1.10
10
TEMPERATURE (°C)
VIN - VOUT (mV)
1.20
-20
125
40
VOUT = 4V
MIC2033-12xx
VIN - VOUT (mV)
CURRENT LIMIT (A)
40
VIN = 5V
VIN = 5V
FAULT/ PIN RESISTANCE (Ω)
10
50
1.25
0.50
TEMPERATURE (°C)
TEMPERATURE (°C)
1.30
0.75
0.00
-50
125
1.00
0.25
0
400
VOUT = 4V
MIC2033-10xx
1.25
CURRENT LIMIT (A)
V IN = 5V
CURRENT LIMIT (mA)
CURRENT LIMIT (mA)
Current Limit
vs. Temperature
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
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Micrel, Inc.
MIC2033
Functional Characteristics
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MIC2033
Functional Characteristics (Continued)
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MIC2033
Functional Diagram
Figure 4. MIC2033 Block Diagram
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MIC2033
directly tied to VIN or driven by a voltage that is equal to
or less than VIN, but do not leave this pin floating.
Functional Description
The MIC2033 is a high-side MOSFET power distribution
switch providing increased system reliability utilizing 5%
current limit accuracy. The MIC2033 has an operating
input voltage range from 2.5V to 5.5V and is internally
current limited and has thermal shutdown that protects
the device and system.
Current Limit
The MIC2033 is available with four fixed current limit
settings: 0.5A, 0.8A, 1A, and 1.2A. If the output current
exceeds the set current limit, then the MIC2033 switch
will enter constant current limit mode. The maximum
allowable current limit may be less than the full specified
and/or expected current if the MIC2033 is not mounted
on a circuit board with sufficiently low thermal resistance.
The MIC2033 responds within 10µs to short circuits to
limit the output current and also provides an output fault
flag that will assert (low) for an over current condition
that lasts longer than 32ms.
Soft-Start
Soft-start reduces the power supply input surge current
at startup by controlling the output voltage rise time. The
input surge appears while the output capacitor is
charged up. A slower output rise time will draw a lower
input surge current.
During soft-start, an internal current sink discharges the
external capacitor at CSLEW to ground to control the
ramp of the output voltage. The output voltage rise time
is dependent upon the value of CCSLEW, the input voltage,
output voltage, and the current limit. The value of the
CSLEW external capacitor is recommended to be in the
range of 0.1µF to 1µF.
Input Capacitor
A 1µF to 10µF ceramic input capacitor is recommended
for most applications.
The input capacitor must be placed on the same side of
the board and next to the MIC2033 to minimize the
voltage ringing during transient and short circuit
conditions. It is also recommended to use two vias for
each end of the capacitor to connect to the power and
ground plane.
X7R or X5R dielectric ceramic capacitors are
recommended
because
of
their
temperature
performance. X7R-type capacitors change capacitance
by 15% over their operating temperature range and are
the most stable type of ceramic capacitors. Z5U and
Y5V dielectric capacitors change value by as much as
50% and 60% respectively over their operating
temperature ranges. To use a ceramic chip capacitor
with Y5V dielectric, the value must be much higher than
an X7R ceramic or a tantalum capacitor to ensure the
same capacitance value over the operating temperature
range.
Thermal Design
To help reduce the thermal resistance, the ePad
(underneath the IC) should be soldered to the PCB
ground and the placement of thermal vias either
underneath or near the ePad is highly recommended.
Thermal design requires the following applicationspecific parameters:
 Maximum ambient temperature (TA)
 Output current (IOUT)
 Input voltage (VIN)
 Current Limit (ILIMIT)
When the MIC2033 is in constant current limit mode, it
may exceed the over temperature threshold. If this
occurs, the over temperature condition will shut down
the MIC2033 switch and the fault status flag will go
active (assert low). After the switch cools down, it will
turn on again. The MIC2033 power dissipation can be
maximized by either lowering the thermal resistance on
the exposed pad (only the DFN package has an
exposed pad) on the printed circuit board, or by limiting
the maximum allowable ambient temperature.
Thermal Measurements
It is always wise to measure the IC’s case temperature
to make sure that it is within its operating limits. Although
this might seem like a very elementary task, it is very
easy to get erroneous results. The most common
mistake is to use the standard thermal couple that
comes with the thermal voltage meter. This thermal
couple wire gauge is large, typically 22 gauge, and
behaves like a heatsink, resulting in a lower case
measurement.
There are two suggested methods for measuring the IC
case temperature: a thermal couple or an infrared
thermometer. If a thermal couple is used, it must be
constructed of 36 gauge wire or higher to minimize the
wire heatsinking effect. In addition, the thermal couple tip
must be covered in either thermal grease or thermal glue
Output Capacitor
The output capacitor type and placement criteria are the
same as the input capacitor. See the Input Capacitor
section for a detailed description.
Enable
The MIC2033 offers either an active high or active low
enable input (EN) that allows ON/OFF control of the
switch output. The current through the device reduces to
near “zero” when the device is shutdown, with only
microamperes of leakage current. The EN input may be
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MIC2033
to make sure that the thermal couple junction is making
good contact to the case of the IC. This thermal couple
from Omega (5SC-TT-K-36-36) is adequate for most
applications.
To avoid this messy thermal couple grease or glue, an
infrared thermometer is recommended. Most infrared
August 2012
thermometers’ spot size is too large for an accurate
reading on small form factor ICs. However, an IR
thermometer from Optris has a 1mm spot size, which
makes it ideal for the 3mm  3mm DFN package. Also,
get the optional stand. The stand makes it easy to hold
the beam on the IC for long periods of time.
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MIC2033
Evaluation Board Schematic
Bill of Materials
Item
C1, C2
C3
R1, R2
U1
Part Number
Manufacturer
C1608X5R0J105K
TDK(1)
06036D105KAT2A
AVX(2)
06033C104KAT2A
TDK
C1608X7R1E104K
AVX
CRCW060310K0FKEA
Vishay/Dale(3)
MIC2033-xxxYMT
Micrel
(4)
Description
Qty.
1µF/6.3V ceramic capacitor, X5R, 0603
2
0.1µF/25V ceramic capacitor, X7R, 0603
1
10kΩ, film resistor, 0603, 1%
2
High-accuracy, high-side, fixed current limit power switch
1
Notes:
1. TDK: www.tdk.com.
2. AVX.: www.avx.com.
3. Vishay: www.vishay.com.
4. Micrel, Inc.: www.micrel.com
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Micrel, Inc.
MIC2033
PCB Layout (MIC2033-xxxYMT Evaluation Board)
MIC2033-xxxYMT Evaluation Board – Top Layer
MIC2033-xxxYMT Evaluation Board – Bottom Layer
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MIC2033
PCB Layout (MIC2033-xxxYM6 Evaluation Board)
MIC2033-xxxYM6 Evaluation Board – Top Layer
MIC2033-xxxYM6 Evaluation Board – Bottom Layer
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MIC2033
Package Information
6-Pin 2mm x 2mm Thin DFN (MT)
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Micrel, Inc.
MIC2033
Package Information (Continued)
SOT23-6L (M6)
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MIC2033
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2012 Micrel, Incorporated.
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