Features. Schematic Symbol MIC94050 MIC94051

Transcription

1 MIC945/945 4-Terminal ymfet P-Channel MOFET eneral escription The MIC945 and MIC945 are 4-terminal silicon gate P-channel MOFETs that provide low on-resistance in a very small package. esigned for high-side switch applications where space is critical, the MIC945/ exhibits an on-resistance of typically.25ω at 4.5V gate-to-source voltage. The MIC945/ also operates with only.8v gate-to-source voltage. The MIC945 is the basic 4-lead P-channel MOFET. The MIC945 is a variation that includes an internal gate pullup resistor that can reduce the system parts count in many applications. The 4-terminal OT-43 package permits a substrate connection separate from the source connection. This 4-terminal configuration improves the θ JA (improved heat dissipation) and makes reverse-blocking switch applications practical. The small size, low threshold, and low R (on) make the MIC945/ the ideal choice for PCMCIA, UB, back-up battery-power, and distributed power management applications. ymfet Features.25Ω typical on-resistance at 4.5V gate-to-source voltage Operates with.8v gate-to-source voltage eparate substrate connection allows reverse-blocking Applications istributed power management PCMCIA card power management UB ports Battery-powered computers, peripherals Handheld bar-code scanners Portable communications equipment Reverse blocking battery management Ordering Information Part Number Temp. Range* Package Pb-FREE MIC945BM4 4 C to +5 C OT-43 NO MIC945BM4 4 C to +5 C OT-43 NO MIC945YM4 4 C to +5 C OT-43 YE MIC945YM4 4 to +5 C OT-43 YE * Operating Junction Temperature Pin Configuration Part Identification rain ate P5x ubstrate ource Part Number MIC945BM4 MIC945BM4 MIC945YM4 MIC945YM4 Identification P5 P5 P5 P5 Typical PCB Layout PCB heat sink plane improves heat dissipation chematic ymbol OT-43 Package (M4) PCB traces Functional iagrams ate ymfet is a trademark of, Inc. ource ubstrate rain ~35kΩ Internal gate-to-source pull-up resistor chematic ymbol MIC945 MIC945, Inc. 849 Fortune rive an Jose, CA 953 UA tel + (48) fax + (48) January 27 MIC945/945

2 Absolute Maximum Ratings rain-to-ource Voltage... 6V ate-to-ource Voltage... 6V Continuous rain Current T A = 25 C (V = 4.5V)....8A T A = C (V = 4.5V)....2A Total Power issipation T A = 25 C mW T A = C mW Operating Junction Temperature... 4 C to +5 C torage Temperature C to +5 C E Rating, Note 2 Operating Ratings Thermal Resistance θ JA C/W θ JC... 3 C/W Electrical Characteristics (Note ) ymbol Parameter Condition (Note ) Min Typ Max Units V ate Threshold Voltage V = V, I = 25µA.5.2 V I ate-body Leakage V = V, V = 4.5V, Note 2, Note 3 µa R ate-ource Resistance V = V, V = 4.5V, Note 2, Note kω C I Input Capacitance V = V, V = 5.5V 6 pf I Zero ate Voltage rain Current V = 5.5V, V = V µa V = 5.5V, V = V, T J = 85 C 5 µa R (ON) rain-ource -Resistance V = 4.5V, I = ma.25.6 Ω V = 3.6V, I = ma.35.8 Ω V = 2.5V, I = ma.65.2 Ω V =.8V, I = ma Ω g F Forward Transconductance V = 5.5V, I = 2mA, Note 5 3 Note. Note 2. Note 3. Note 4. T A = 25 C unless noted. ubstrate connected to source for all conditions. E gate precautions required MIC945 only. MIC945 only. Note 5. Pulse Test: Pulse Width 8µs, uty Cycle.5%. MIC945/945 2 January 27

3 Typical Characteristics I (A) rain Characteristics V 7 3.V V V 2.5V RAIN-TO-OURCE VOLTAE (V) R (ON) (mω) Resistance vs. ate-to-ource Voltage I = ma I = A ATE-TO-OURCE VOLTAE (V) R (ON) (mω) R (ON) vs. rain Current.8V 4.2V 2.5V 3.3V RAIN CURRENT (A) RAIN-OURCE IOE V F (V) ource rain iode Forward Voltage rop vs. Current µs Pulse RAIN-OURCE CURRENT (A) ATE THREHOL (V) ate Threshold vs. Temperature I = 25µA TEMPERATURE ( C) R (ON) (NORMALIZE) R (ON) Variance vs. Temperature V =3.6V.8 I =.A TEMPERATURE ( C) January 27 3 MIC945/945

4 Typical Applications * +5V MIC945 74HC4 * ubstrate must be connected to source Figure. witch Application +5V Open rain Output Internal Resistor MIC945 * * ubstrate must be connected to source Figure 2. witch Application (with internal gate-source pull-up) A +4V MIC945 A B Output V +4V Li Coin Cell don t! +2.7V to 3.6V Li Coin Cell 2MΩ MIC945 B Figure 3. Reverse-Blocking Battery Back-Up Application MIC945/945 4 January 27

5 Package Information OT-43 (M4) MICREL, INC. 28 FORTUNE RIVE AN JOE, CA 953 UA TEL + (48) FAX + (48) 474- WEB The information furnished by in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by for its use. reserves the right to change circuitry and specifications at any time without notification to the customer. Products are not 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 Products for use in life support appliances, devices or systems is a Purchaser s own risk and Purchaser agrees to fully indemnify for any damages resulting from such use or sale. 22, Incorporated January 27 5 MIC945/945