MIC2039
High-Accuracy, High-Side, Adjustable
Current Limit Power Switch
General Description
The MIC2039 is a high-side MOSFET power distribution
switch providing increased system reliability by using 5%
current-limit accuracy.
The MIC2039 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 MIC2039
is offered with either active-high or active-low logic level
enable input controls. It has an open drain fault status
output flag with a built-in 32ms delay that asserts low
during overcurrent or thermal-shutdown conditions.
The MIC2039 switches feature an adjustable output
current limit that is resistor programmable from 0.2A to
2.5A. The MIC2039 switch also offers a unique, Kickstart
feature that allows momentary high-current surges up to
the secondary current limit (I
LIMIT_2nd
) during startup or
while operating in steady state. This is useful for charging
loads with high inrush currents, such as capacitors. After
an overcurrent condition is established, these switches
enter into a constant current-limit mode unless the die
temperature exceeds the thermal-shutdown specification.
The MIC2039 is available in 6-pin SOT-23 and 6-pin
2mm × 2mm thin DFN packages. The MIC2039 has an
operating junction temperature range of
−40°C
to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
±5% current limit accuracy
Input supply range from 2.5V to 5.5V
Low quiescent current: 100µA typical (switch ON)
75mΩ typical R
DS(ON)
at 5.0V
0.2A to 2.5A adjustable output current
Kickstart
−
momentary secondary current-limit threshold
(120ms period)
Soft-start functionality
Undervoltage lockout (UVLO)
Fast 10µs short-circuit response time (non-Kickstart
options)
Fault status output flag
Logic-controlled enable (active-high, active-low)
Thermal shutdown
Pin compatible with the MIC2009/MIC2019
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
December 8, 2014
Revision 1.3
Micrel, Inc.
MIC2039
Ordering Information
Part Number
MIC2039AYM6
MIC2039BYM6
MIC2039AYMT
MIC2039BYMT
MIC2039EYM6
MIC2039FYM6
MIC2039EYMT
MIC2039FYMT
Note:
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.
Top
Mark
(1)
39AA
39BB
3A9
B39
39AE
39AF
D39
F39
Current
Limit
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Enable
Active High
Active Low
Active High
Active Low
Active High
Active Low
Active High
Active Low
Kickstart
No
No
No
No
Yes
Yes
Yes
Yes
Package
SOT-23-6L
SOT-23-6L
6-pin 2mm x 2mm Thin DFN
(2)
6-pin 2mm x 2mm Thin DFN
(2)
SOT-23-6L
SOT-23-6L
6-pin 2mm x 2mm Thin DFN
(2)
6-pin 2mm x 2mm Thin DFN
(2)
Pin Configuration
SOT-23 6-pin (M6)
Top View
Notes:
3. Thin DFN ▲ = Pin 1 identifier.
2mm x 2mm 6-pin Thin DFN (MT)
(3)
(Top View)
December 8, 2014
2
Revision 1.3
Micrel, Inc.
MIC2039
Pin Description
Pin Number
SOT-23-6L
1
2
3
6-Pin
2mm x 2mm
Thin DFN
6
5
4
Pin Name
Pin Function
VIN
GND
EN
Input: Power switch and logic supply input.
Ground: Input and output return pin.
Enable (Input): Logic compatible, enable control input that allows switch turn-
on/off. Do not leave the EN pin floating.
Fault Status Flag (Output): Active-low, open-drain output. A logic low state
indicates an overcurrent or thermal shutdown condition. An overcurrent
condition must last longer than t
FAULT
/ to assert FAULT/. A pull-up resistor
(10kΩ recommended) to an external supply is required.
Current Limit Set: Current limit adjust setting. Connect a resistor from this pin
to GND to set the current limit, but do not leave the ILIMIT pin floating.
Switch Output: Power switch output.
Exposed Pad: Exposed pad on bottom of package. Connect to electrical
ground for optimum thermal dissipation.
4
3
FAULT/
5
6
—
2
1
EP
ILIMIT
VOUT
ePad
December 8, 2014
3
Revision 1.3
Micrel, Inc.
MIC2039
Absolute Maximum Ratings
(4)
V
IN
to GND.......................................................
−0.3V
to +6V
V
OUT
to GND ....................................................
−0.3V
to +6V
V
ILIMIT
to GND ..................................................
−0.3V
to +6V
V
EN
to GND ......................................................
−0.3V
to +6V
V
FAULT/
to GND .................................................
−0.3V
to +6V
FAULT/ Current (I
FAULT/
) .............................................. 25mA
Maximum Power Dissipation (P
D
) ............. Internally Limited
Lead Temperature (soldering, 10s) ............................ 260°C
Storage Temperature (T
S
) .........................
−65°C
to +150°C
ESD Rating
(6)
HBM ......................................................................... 3kV
MM ......................................................................... 300V
Operating Ratings
(5)
Supply Voltage (V
IN
) ..................................... +2.5V to +5.5V
V
EN
, V
FAULT/
...................................................
−0.3V
to +5.5V
V
ILIMIT
, V
OUT
........................................................
−0.3V
to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Resistance
SOT-23-6 (θ
JA
) .............................................. 177.2°C/W
6-pin 2mm
×
2mm Thin DFN (θ
JA
) ..................... 90°C/W
Electrical Characteristics
(7)
V
IN
= V
EN
= 5V; C
IN
= 1µF; T
J
= 25°C.
Bold
values indicate –40°C≤ T
A
≤ +85°C, unless noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
Power Supply Input
V
IN
V
UVLO
V
UVLOHYS
Input Voltage Range
Input Supply Undervoltage
Lockout Threshold
Input Supply Undervoltage
Lockout Threshold Hysteresis
V
IN
rising
V
IN
falling
V
IN
rising or V
IN
falling
Switch OFF
(I
OUT
= 0A)
I
DD
Supply Current
Switch ON
(I
OUT
= 0A)
Power MOSFET
V
IN
= 2.5V, I
OUT
= 350mA
R
DS(ON)
Switch On Resistance
V
IN
= 3.3V, I
OUT
= 350mA
V
IN
= 5V, I
OUT
= 350mA
I
LKG
Notes:
4. Exceeding the absolute maximum ratings may damage the device.
5. The device is not guaranteed to function outside its operating ratings.
6. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
7. Specification for packaged product only
2.5
2.0
1.9
2.25
2.15
100
5.5
2.5
2.4
V
V
V
mV
Active-high Enable (A): V
EN
= 0V,
V
IN
= 5V
Active-low Enable (B): V
EN
= V
IN
= 5V
Active-high Enable (A): V
EN
= 1.5V,
V
IN
= 5V
Active-low Enable (B): V
EN
= 0V,
V
IN
= 5V
0.75
5
µA
100
300
100
85
75
0.22
177
145
125
15
µA
mΩ
Output Leakage Current
Switch Off, V
OUT
= 0V
December 8, 2014
4
Revision 1.3
Micrel, Inc.
MIC2039
Electrical Characteristics
(7)
(Continued)
V
IN
= V
EN
= 5V; C
IN
= 1µF; C
OUT
= 1µF T
J
= 25°C.
Bold
values indicate –40°C ≤ T
J
≤ +125°C, unless noted otherwise.
Symbol
Parameter
Condition
R
LIMIT
= 115Ω, V
IN
= 5V, V
OUT
= 0.8V × V
IN
R
LIMIT
= 115Ω, V
IN
= 2.5V, V
OUT
= 0V
I
LIMIT
Current Limit
(Resistor values are standard
0.1% values)
R
LIMIT
= 145Ω, V
IN
= 5V, V
OUT
= 0.8V × V
IN
R
LIMIT
= 287Ω, V
IN
= 5V, V
OUT
= 0.8V × V
IN
R
LIMIT
= 576Ω, V
IN
= 5V, V
OUT
= 0.8V × V
IN
R
LIMIT
= 1.45kΩ, V
IN
= 5V, V
OUT
= 0.8V × V
IN
I
LIMIT_2nd
I/O
V
EN
I
EN
R
FAULT/
I
FAULT/_OFF
Enable Voltage
Enable Input Current
FAULT/ Output Resistance
FAULT/ Off Current
Logic Low
Logic High
0V ≤ V
EN
≤ 5V
I
OUT
= 10mA
V
FAULT/
= V
IN
1.5
1
25
10
0.5
V
µA
Ω
µA
Secondary Current Limit
(Kickstart parts only)
V
OUT
= 0V
Min.
Typ.
Max.
Units
Current Limit
2.35
2.6
1.90
0.95
0.475
0.19
2.2
2.5
2.85
2.0
1.0
0.50
0.20
3.2
2.65
3.1
2.10
1.05
0.525
0.21
6
A
A
Thermal Protection
T
SD
T
SDHYS
Thermal-Shutdown Threshold
Thermal-Shutdown
Hysteresis
Output Turn-on Rise Time
(8)
Output Turn-off Fall Time
(8)
Output Turn-on Delay
(8)
Output Turn-off Delay
(8)
Short Circuit Response
(8)
Time
Overcurrent Fault Response
(8)
Delay Time
Overcurrent Fault Response
(8)
Delay During Kickstart
T
J
rising
157
15
°C
°C
Timing Specifications (AC Parameters)
t
RISE
t
FALL
t
ON_DLY
t
OFF_DLY
t
SC_RESP
t
FAULT/
t
KICKSTART
Note:
8. See “Timing Diagrams” (Figures 1 through 4).
R
LOAD
= 10Ω; C
OUT
= 1µF
V
EN
= OFF; R
LOAD
= 10Ω; C
OUT
= 1µF
R
LOAD
= 10Ω; C
OUT
= 1µF
R
LOAD
= 10Ω; C
OUT
= 1µF
V
OUT
= 0V (short circuit)
Non-Kickstart parts
Kickstart parts only
16
64
700
32
700
5
10
32
120
49
200
µs
µs
µs
µs
µs
ms
ms
December 8, 2014
5
Revision 1.3
嵌入式系统
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