MIC2544A MICREL [Micrel Semiconductor], MIC2544A Datasheet
MIC2544A
Available stocks
Related parts for MIC2544A
MIC2544A Summary of contents
Page 1
... The enable signal is compatible with both 3V and 5V logic, and is also used as the thermal shutdown latch reset for the MIC2548A The MIC2544A and MIC2548A are available in active-high and active-low enable versions in the 8-pin SOIC (small-outline integrated circuit) and 8-pin MSOP (micro- small-outline package) ...
Page 2
... MIC2544A/2548A Package Pb-Free 8-pin SOIC 8-pin MSOP 8-pin SOIC 8-pin MSOP 8-pin SOIC 8-pin MSOP 8-pin SOIC ...
Page 3
... Current Limit: Sets current-limit threshold using an external resistor, R ILIM connected to ground. 154Ω < Input: Output MOSFET drain. Also powers internal circuitry. Switch (Output): Output MOSFET source. Pins 6 and 8 must be externally OUT connected. NC Not internally connected. 3 MIC2544A/2548A 8-Pin MSOP (MM) < 2.29kΩ. SET M9999-043010 1 SET ...
Page 4
... SOIC (θ ) ........................................................160°C/W JA MSOP (θ ) ......................................................206°C/W JA Min Typ 2.7 0.75 90 2.4 1.7 1.5 0.1 0 (6) 161 230 184 230 MIC2544A/2548A IN Max Units 5 µA 160 µA V 0.8 V 1.0 µA 1.0 µA pF µs µs 120 mΩ 10 µA 299 V 276 V µ µs µ ...
Page 5
... 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. Off is ≤0.8V and on is ≥2.4V for the MIC2544A-1 and MIC2548A-1. Off is ≥2.4V and on is ≤0.8V for the MIC2544A-2 and MIC2548A-2. The enable input has about 200mV of hysteresis. ...
Page 6
... Micrel, Inc. Test Circuit Timing Diagrams April 2010 Functional Characteristics Test Circuit Figure 1a. MIC2544A-1/MIC2548A-1 Figure 1b. MIC2544A-2/MIC2548A-2 6 MIC2544A/2548A M9999-043010 ...
Page 7
... Micrel, Inc. Timing Diagrams (Continued) Figure 2a. MIC2548A-2 Timing: Output is reset by toggling EN April 2010 Figure 2b. MIC2544A-2 Timing 7 MIC2544A/2548A M9999-043010 ...
Page 8
... TEMPERATURE (°C) Short Circuit Current vs. Temperature 2.0 1.5 3.3V 1.0 5V 0.5 0.0 -40 - TEMPERATURE (°C) 8 MIC2544A/2548A Enable Threshold vs. Input Voltage 2.0 Rising 1.8 1.6 1.4 Falling 1.2 1.0 0.8 0.6 Hysteresis 0.4 0.2 0.0 2.5 3 3.5 4 4.5 5 5.5 INPUT VOLTAGE (V) R DS(ON) vs. Input Voltage 120 85°C 100 80 25°C 60 -40° ...
Page 9
... I_OUT 0.2 I_OUT_Mea 0.0 0 500 1000 1500 2000 2500 RSET (Ω) Rise Time vs. Temperature 4.5 3.3V 4.0 3.5 3.0 5V 2.5 2.0 1.5 1.0 0.5 0.0 -40 - TEMPERATURE (°C) 9 MIC2544A/2548A OUT vs. Output Current 160 140 3.3V IN 120 100 - 0.25 0.5 0.75 1 1.25 1.5 OUTPUT CURRENT (A) Rise Time vs. Input Voltage 6 -40° 25°C 85° ...
Page 10
... Micrel, Inc. Functional Characteristics Note: The following applies unless otherwise noted: MIC2544A-1, T April 2010 = 25° 5.0V 232Ω 10µ SET OUT 10 MIC2544A/2548A M9999-043010 ...
Page 11
... Micrel, Inc. Functional Characteristics (Continued) April 2010 11 MIC2544A/2548A M9999-043010 ...
Page 12
... Micrel, Inc. Functional Characteristics (Continued) April 2010 12 MIC2544A/2548A M9999-043010 ...
Page 13
... Micrel, Inc. Functional Characteristics (Continued) April 2010 13 MIC2544A/2548A M9999-043010 ...
Page 14
... Micrel, Inc. Block Diagram Functional Description The MIC2544A and MIC2548A are high-side N-channel switches available with either active-high or active-low enable inputs. Fault conditions turn-off or inhibit turn-on of the output transistor and activate the open-drain error flag transistor making it sink current-to-ground. Input and Output IN is the power supply connection to the logic circuitry and the drain of the output MOSFET ...
Page 15
... Table 2. MIC2544A/2548A R MIC2544A/2548A I LIMIT_MAX 1.19A (+19%) I_OUT_Max 0.260 0.390 0.520 0.650 0.720 0.840 0.960 1.080 1.200 1.320 1.440 1.560 1.680 1.800 Table SET is D M9999-043010 ...
Page 16
... Micrel, Inc. Application Information Supply Filtering A minimum 1μF bypass capacitor from IN-to-GND, located near the MIC2544A and MIC2548A, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. An additional 22µF input capacitor placed close to the IC is required if a bulk input capacitor is further than 3 inches away from the IC ...
Page 17
... This “soft start” feature effectively isolates power supplies from highly capacitive loads by reducing inrush current during hot-plug events. Figure 9 shows how the MIC2544A may be used in a hot-plug application. April 2010 = 100µF ...
Page 18
... Micrel, Inc. Note: MSOP package option uses pin 5 for ILIM. Pin 4 is not connected (NC). Bold lines indicate 0.1” wide, 1-oz. copper high-current traces. April 2010 Figure 8. USB Host Application Figure 9. Hot Plug Application 18 MIC2544A/2548A M9999-043010 ...
Page 19
... 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 April 2010 8-pin SOIC (M) 8-Pin MSOP (MM) indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. 19 MIC2544A/2548A M9999-043010 ...