MIC2537-1BM Micrel Inc, MIC2537-1BM Datasheet
MIC2537-1BM
Specifications of MIC2537-1BM
Related parts for MIC2537-1BM
MIC2537-1BM Summary of contents
Page 1
... MIC2537 General Description The MIC2537 is a cost-effective high-side power switch with four independently controlled channels, optimized for bus- powered Universal Serial Bus (USB) applications. Few exter- nal components are necessary to satisfy USB requirements. The MIC2537 satisfies the following USB requirements: each switch channel supplies up to 100mA as required by USB bus-powered downstream devices ...
Page 2
... MIC2537 Ordering Information Part Number MIC2537-1BM MIC2537-2BM Pin Configuration Pin Description Pin Number Pin Name 1 FLGA 2 ENA 3 OUTA 4 GND OUTB 7 ENB 8 FLGB 9 FLGC 10 ENC 11 OUTC OUTD 15 END 16 FLGD December 1999 Enable Temperature Range Active High – +85 C Active Low – +85 C MIC2537-x ...
Page 3
... F, Note Note Note Note 4.0V OUT increasing decreasing = 5V 10mA L = 3.3V 10mA 2.4V and on is 0.8V for the MIC2537-2. The enable input has approximately 3 (Note 2) ) ...................................... +3V to +5. ........ – + .......................................................... 120 C/W JA Min Typ 0.75 70 1.8 0.8 1.6 0.01 0.01 1 425 0.51 0.2 0.5 ...
Page 4
... Ouput On-Resistance Variation vs. Supply Voltage 500 400 300 200 100mA 100 SUPPLY VOLTAGE (V) Overcurrent Threshold and Current Limit vs. Temperature 300 250 I THR 200 I 150 LIM 100 -40 - 100 TEMPERATURE ( C) Output Rise Time vs. Temperature 500 400 300 200 0. 100 L 0 -40 - 100 TEMPERATURE ( C) MIC2537 ...
Page 5
... MIC2537 Functional Characteristics Input Voltage Response (Input Voltage Rising: MIC2537- TIME (25ms/div.) Current Limit Transient Response (Heavy Load Applied to Output: MIC2537-2) 1V TIME (25 s/div.) December 1999 = Input Voltage Response (Input Voltage Decreasing: MIC2537- TIME (25ms/div.) Current Limit Response (Ramped Load: MIC2537-2) 1V 180mA ...
Page 6
... Test Circuit Timing Diagrams V OUT OUT OUT December 1999 Device Under OUT Test 90% 10% Output Rise and Fall Times 50% t OFF t ON 90% Active-Low Switch Delay Times (MIC2537-2) 50% t OFF t ON 90% Active-Low Switch Delay Times (MIC2537- OUT t F 90% 10% 10% 10% Micrel MIC2537 ...
Page 7
... December 1999 CHARGE PUMP CHARGE PUMP THERMAL OSC. SHUTDOWN CHARGE PUMP CHARGE PUMP GND 7 FLGA OUTA GATE CONTROL CURRENT LIMIT FLG B OUTB GATE CONTROL CURRENT LIMIT 1.2V IN REFERENCE CURRENT LIMIT GATE CONTROL OUTC FLGC CURRENT LIMIT GATE CONTROL OUTD FLGD Micrel MIC2537 ...
Page 8
... This constant current is specified as the short-circuit current limit in the “Electrical Characteristics” table important to note that the MIC2537 will deliver load current up to the current-limit threshold. See the “Functional Characteristics: Current-Limit Response” graph for details. ...
Page 9
... In USB applications it is required that output bulk capacitance shown in “Typical Application” is utilized to meet transient regulation requirements during hot-plug events. When the MIC2537 is enabled, the flag will go active for about 5ms depending on output capacitance. Additionally, during hot- plug events, inrush currents may cause the flag to go active for approximately these “ ...
Page 10
... The USB Specification does not require bus-powered hubs to report overcurrent conditions to the host since the hub is already current-limited at the upstream port. However desired to report overcurrent, the Hub Descriptor Status Register must be programmed to indicate this. The MIC2537 provides a flag output for this application. 100mA = 1 . The 10 ...
Page 11
... REF 0.0648 (1.646) 0.0434 (1.102) December 1999 PIN 1 DIMENSIONS: INCHES (MM) 0.020 (0.51) 0.050 (1.27) BSC 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0.394 (10.00) 0.386 (9.80) SEATING PLANE 16-Lead SOP ( –8 0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79) Micrel MIC2537 ...
Page 12
... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. December 1999 + 1 (408) 944-0970 http://www.micrel.com FAX WEB © 1999 Micrel Incorporated 12 Micrel MIC2537 ...