MICREL MIC2545A-2BM, MIC2548-2BMM, MIC2548-2BM, MIC2548-1BM, MIC2544-2BMM Datasheet
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MIC2544/2548
EN
FLG
GND
ILIM
OUT
IN
OUT
NC
MIC2544-xBM
On/Off
Peripheral
0.1µF
R
SET
+5V
R
FLG
33µF
SOP pinout shown
Micrel
MIC2544/2548
Programmable Current Limit High-Side Switch
Preliminary Information
General Description
The MIC2544 and MIC2548 are integrated high-side power
switches optimized for low loss dc power switching and other
power management applications, including Advanced Configuration and Power Interface (ACPI). The MIC2544/48 is a
cost-effective, highly integrated solution that requires few
external components to satisfy USB and ACPI requirements.
Load current management features include a precision resistor-programmable output current-limit and a soft-start circuit
which minimizes inrush current when the switch is enabled.
Thermal shutdown, along with current-limit, protects the
switch and the attached device.
The MIC2544/48’s open-drain flag output is used to indicate
current-limiting or thermal shutdown to a local controller. The
MIC2548 has an additional internal latch which turns the
output off upon thermal shutdown providing robust fault
control. The enable signal is compatible with both 3V and 5V
logic, and is also used as the thermal shutdown latch reset for
the MIC2548.
The MIC2544 and MIC2548 are available in active-high and
active-low enable versions in the 8-pin SOP (small-outline
package) and 8-pin MSOP (micro-small-outline package).
Features
• 2.7V to 5.5V input
• Adjustable current-limit up to 1.5A
• Reverse current flow blocking (no “body diode”)
• 75µA typical on-state supply current
• 1µA typical off-state supply current
• 120mΩ maximum on-resistance
• Open-drain fault flag
• Thermal shutdown
• Thermal shutdown output latch (MIC2548)
• 2ms (slow) turn-on and fast turnoff
• Available with active-high or active-low enable
Applications
• USB power distribution
• PCI Bus Power Switching
• Notebook PC
• ACPI power distribution
• PC card hot swap applications
• Inrush current-limiting
Typical Application
Typical Advanced Configuration and Power Interface (ACPI) Application
June 2000 1 MIC2544/2548
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
MIC2544/2548
Ordering Information
Part Number Enable Latch* Temperature Range Package
MIC2544-1BM Active High –40°C to +85°C 8-pin SOP
MIC2544-1BMM Active High –40°C to +85°C 8-pin MSOP
MIC2544-2BM Active Low –40°C to +85°C 8-pin SOP
MIC2544-2BMM Active Low –40°C to +85°C 8-pin MSOP
MIC2548-1BM Active High •–40°C to +85°C 8-pin SOP
MIC2548-1BMM Active High •–40°C to +85°C 8-pin MSOP
MIC2548-2BM Active Low •–40°C to +85°C 8-pin SOP
MIC2548-2BMM Active Low •–40°C to +85°C 8-pin MSOP
* Thermal Shutdown Latch
Pin Configuration
Micrel
EN
FLG
GND
ILIM
MIC2544/2548
1
2
3
4
8-Pin SOP (M)
OUT
8
IN
7
OUT
6
NC
5
MIC2544/2548
(EN)
(FLG)
LOGIC,
CHARGE
PUMP
(OUT)
(IN)
(GND)(ILIM)
FLG
GND
NOTE: PINS 4 AND 5
FOR SOIC AND MSOP
ARE DIFFERENT.
MIC2544/2548
EN
1
2
3
NC
4
8-Pin MSOP (MM)
OUT
8
IN
7
OUT
6
ILIM
5
Pin Description
Pin Number Pin Number Pin Name Pin Function
MSOP-8 SOP-8
1 1 EN Enable (Input): Logic-compatible enable input. Active-high (-1) or active-low
(-2). High input >1.7V typical; low input <1.5V typical. Do not float.
MIC2548 only: Also resets thermal shutdown latch.
2 2 FLG Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent or
thermal shutdown conditions.
MIC2548 only: latched low on thermal shutdown.
3 3 GND Ground
5 4 ILIM Current Limit: Sets current-limit threshold using an external resistor, R
connected to ground. 154Ω < R
7 7 IN Input: Output MOSFET drain. Also powers internal circuitry.
6,8 6,8 OUT Switch (Output): Output MOSFET source. Pins 6 and 8 must be externally
connected.
4 5 NC Not internally connected
< 2.29kΩ.
SET
SET
,
MIC2544/2548 2 June 2000
MIC2544/2548
Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (V
Output Voltage (V
Output Current (I
Enable Input (VEN) ................................. –0.3V to VIN+0.3V
Fault Flag Voltage (V
Fault Flag Current (I
) .................................................. +6.0V
IN
) ............................................... +6.0V
OUT
) ............................... Internally Limited
OUT
)...........................................+6.0V
FLG
) ............................................ 50mA
FLG
Operating Ratings (Note 2)
Supply Voltage (V
Current Limit Set Range.................................. 0.1A to 1.5A
Ambient Temperature Range (TA) ............. –40°C to +85°C
Package Thermal Resistance
SOP (θJA) ..........................................................160°C/W
MSOP (θJA) .......................................................206°C/W
) ................................... +2.7V to +5.5V
IN
Storage Temperature (TS) ....................... –65°C to +150°C
Junction Temperature (T
) ....................... Internally Limited
J
Lead Temperature (soldering 5 sec.) ........................ 260°C
ESD Rating, Note 3 ...................................................... 2kV
Electrical Characteristics
VIN = +5V; TA = 25°C, bold indicates –40°C to +85°C; unless noted
Symbol Parameter Condition Min Typ Max Units
Supply Current switch off, OUT = open, Note 4 0.75 5 µA
switch on, OUT = open, Note 4 75 160 µA
V
EN
R
DS(on)
t
ON
t
R
t
OFF
t
F
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 4. Off is ≤ 0.8V and on is ≥ 2.4V for the MIC2544-1 and MIC2548-1. Off is ≥ 2.4V and on is ≤ 0.8V for the MIC2544-2 and MIC2548-2. The
Note 5. Current limit threshold is determined by
Note 6. Guaranteed by design but not production tested.
Enable Input Voltage enable high, Note 4 2.4 1.7 V
enable low, Note 1 1.5 0.8 V
Enable Input Current VEN = V
VEN = V
= 2.4V 0.01 1 µA
OH(min)
= 0.8V 0.01 1 µA
OL(max)
Enable Input Capacitance Note 6 1pF
Switch Resistance I
Current Limit Factor
= 500mA 80 120 mΩ
OUT
I
= 100mA to 1A, V
OUT
I
= 500mA to 1.5A, V
OUT
= 1V to 4V, Note 5
OUT
= 1V to 4V, Note 5
OUT
184 230 276 V
161 230 299 V
Output Leakage Current switch off 1 10 µA
Output Turn-On Delay RL = 10Ω, CL = 1µF, Figures 1a, 1b 125ms
Output Turn-On Rise Time RL = 10Ω, CL = 1µF, Figures 1a, 1b 125ms
Output Turnoff Delay RL = 10Ω, CL = 1µF, Figures 1a, 1b 22 µs
Output Turnoff Fall Time RL = 10Ω, CL = 1µF, Figures 1a, 1b 21 µs
Overtemperature Threshold TJ increasing 140 °C
Shutdown TJ decreasing 130 °C
Error Flag Output Resistance VIN = 5V, IL = 10µA415 Ω
VIN = 3.3V, IL = 10µA520 Ω
Error Flag Off Current V
= 5V 0.01 1 µA
FLG
EN Pulse Reset Width MIC2548 thermal shutdown latch 5 µs
VIN to EN Set-Up MIC2548, Note 6 0 µs
Current-Limit Response Time V
Overcurrent Flag Response Time V
enable input has about 200mV of hysteresis.
I
LIMIT
==
230V
R
= 0V, Note 6 25 µs
OUT
= VIN/2 to FLG low 5 µs
OUT
SET
, where R
is in ohms.
SET
June 2000 3 MIC2544/2548
MIC2544/2548
Test Circuit
Device
Under
Test
OUT
I
OUT
Micrel
V
OUT
C
R
L
L
Timing Diagrams
t
r
V
OUT
90%
10%
90%
10%
t
f
Functional Characteristics Test Circuit
V
EN
V
OUT
50%
t
OFF
t
ON
90%
10%
Figure 1a. MIC2544/48-1
50%
t
OFF
t
ON
90%
10%
V
V
OUT
EN
Figure 1b. MIC2544/48-2
MIC2544/2548 4 June 2000
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