MIC2042/2043 Micrel MIC2042/2043 Single Channel, High Current, Low Voltage, Protected Power Distribution Switch General Description Features The MIC2042 and MIC2043 are high-side MOSFET switches 60m max. on-resistance optimized for general purpose power distribution applications 0.8V to 5.5V operating range which require circuit protection. The devices switch up to 5.5V Adjustable current limit and as low as 0.8V while offering both programmable current Power-Good detection limiting and thermal shutdown to protect the device and the Up to 3A continuous output current load. A fault status output is provided in order to detect Short-circuit protection with thermal shutdown overcurrent and thermal shutdown fault conditions. Both Adjustable slew-rate control devices employ soft-start circuitry to minimize the inrush Circuit breaker mode (MIC2043) current in applications that employ highly capacitive loads. Fault status flag Additionally, for tighter control over inrush current during Undervoltage lockout start-up, the output slew-rate may be adjusted by an external Output MOSFET reverse current flow block when capacitor. disabled Very fast reaction to short-circuits The MIC2043 features a auto-reset circuit breaker mode that Low quiescent current latches the output off upon detecting an overcurrent condition lasting more than 28ms. The output is reset by removing or reducing the load. Applications All support documentation can be found on Micrels web Docking stations site at www.micrel.com. Notebook PCs PDAs Hot swap board insertions RAID controllers USB hosts ACPI power distribution Typical Application +3.3V C2 MIC2042-1BTS V OUT Power 0.1F 3.3V 1.5A Supply 7 10,11,14 VBIAS VOUT C1 R2 OUT1 OUT2 C 0.1F LOAD 294k 8, 12 13 33F VIN PGREF 1% C3 R1 R3 4.7F 2 20k 24.3k ON/OFF EN 1% Logic R4 IN Controller 3 20k /FAULT MIC39100-2.5BS OVERCURRENT IN 2.5V 9 1 SLEW PWRGD EN OUT GND 6 4 ILIM UVLOIN (OPEN) C4* 0.022F R GND SET 200 5 Note: All V pins (8, 12) must be externally tied together. IN All V pins (10, 11, 14) must be externally tied together. OUT I 2A. LIMIT Output Power-Good = 3.0V. *C4 is optional. SeeApplications Information Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 MIC2042/2043 Micrel Ordering Information Part Number Standard Pb-Free Enable Circuit Breaker VBIAS VIN Range Package MIC2042-1BM MIC2042-1YM Active High 1.6V to 5.5V 8-pin SOP MIC2042-2BM MIC2042-2YM Active Low 1.6V to 5.5V 8-pin SOP MIC2043-1BM MIC2043-1YM Active High X 1.6V to 5.5V 8-pin SOP MIC2043-2BM MIC2043-2YM Active Low X 1.6V to 5.5V 8-pin SOP MIC2042-1BTS MIC2042-1YTS Active High X 0.8V to 5.5V 14-pin TSSOP MIC2042-2BTS MIC2042-2YTS Active Low X 0.8V to 5.5V 14-pin TSSOP MIC2043-1BTS MIC2043-1YTS Active High X X 0.8V to 5.5V 14-pin TSSOP MIC2043-2BTS MIC2043-2YTS Active Low X X 0.8V to 5.5V 14-pin TSSOP Pin Configuration PWRGD 1 14 VOUT EN 1 8 VOUT EN 2 13 PGREF /FAULT 2 7 VIN /FAULT 3 12 VIN GND 3 6 VOUT UVLOIN 4 11 VOUT ILIM 4 5 VIN GND 5 10 VOUT 8-Pin SOP (M) ILIM 6 9 SLEW VBIAS 7 8 VIN 14-Pin TSSOP (TS) M0512-112603 2 January 2005