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. ±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. August 2012 2 M9999-082012-A Micrel, Inc. 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. August 2012 3 M9999-082012-A Micrel, Inc. 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). August 2012 5 M9999-082012-A Micrel, Inc. 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 August 2012 6 M9999-082012-A Micrel, Inc. MIC2033 Figure 3. Short Circuit Response Time and Over Current Fault Flag Delay August 2012 7 M9999-082012-A Micrel, Inc. 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) 9 M9999-082012-A 1.25 Micrel, Inc. MIC2033 Functional Characteristics August 2012 10 M9999-082012-A Micrel, Inc. MIC2033 Functional Characteristics (Continued) August 2012 11 M9999-082012-A Micrel, Inc. MIC2033 Functional Diagram Figure 4. MIC2033 Block Diagram August 2012 12 M9999-082012-A Micrel, Inc. 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 August 2012 13 M9999-082012-A Micrel, Inc. 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. 14 M9999-082012-A Micrel, Inc. 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 August 2012 15 M9999-082012-A Micrel, Inc. MIC2033 PCB Layout (MIC2033-xxxYMT Evaluation Board) MIC2033-xxxYMT Evaluation Board – Top Layer MIC2033-xxxYMT Evaluation Board – Bottom Layer August 2012 16 M9999-082012-A Micrel, Inc. MIC2033 PCB Layout (MIC2033-xxxYM6 Evaluation Board) MIC2033-xxxYM6 Evaluation Board – Top Layer MIC2033-xxxYM6 Evaluation Board – Bottom Layer August 2012 17 M9999-082012-A Micrel, Inc. MIC2033 Package Information 6-Pin 2mm x 2mm Thin DFN (MT) August 2012 18 M9999-082012-A Micrel, Inc. MIC2033 Package Information (Continued) SOT23-6L (M6) August 2012 19 M9999-082012-A Micrel, Inc. 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. August 2012 20 M9999-082012-A