MIC204 MICREL [Micrel Semiconductor], MIC204 Datasheet
MIC204
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MIC204 Summary of contents
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... Additionally, for tighter control over inrush current during start up, the output slew-rate may be adjusted by an external capacitor. The MIC2045 features a auto-reset circuit breaker that latches the output OFF upon detecting an overcurrent condition lasting more than 32ms. The output is reset by removing or reducing the load. ...
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... MIC2044/2045 Ordering Information Part Number MIC2044-1BTS MIC2044-2BTS MIC2045-1BTS MIC2045-2BTS Pin Configuration MIC2044/2045 Enable Circuit Breaker Active-High Active-Low Active-High X Active-Low X PWRGD 1 16 VIN PGREF /FAULT 3 14 VOUT SLEW 4 13 VIN UVLOIN 5 12 VOUT ILIM 6 11 VIN VIN 7 10 GND VBIAS 8 9 VOUT ...
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... Description” for further detail. When the PWRGD signal is not utilized, this input should be tied to VOUT. 3 Micrel must be “fully on” (i.e., within = CLF/R . CLF is the current limit SET table. For the MIC2044/45 “Applications Information” for , TH is exceeded. See the TH ...
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... IN BIAS I = 500mA OUT Output off V = 3V, 5V, 0. OUT OUT 1.6V to 5.5V IN BIAS V = 0. rising (MIC2045) OUT Output latched off (MIC2045) I (/FAULT) = 15mA OL I (PWRGD) = 5mA FAULT PWRGD V rising IN V falling IN V rising IN V falling IN T increasing J ...
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... IN BIAS LOAD LOAD LOAD LOAD LOAD LOAD LOAD LOAD > 4.0V for MIC2044/MIC2045 – CLF/R . LIM SET 50 10% (a) MIC2044/45-1 50 10% (b) MIC2044/45-2 Figure 1. Turn-On/Turn-Off Delay Increase the load 0.2V I LIMIT t FLAG ...
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... MIC2044/2045 Test Circuit 75k R4 68k *R and C SET (See specific response plots) MIC2044/2045 C1 0 MIC2044/45-xBTS 0 VBIAS VOUT R1 20k 7, 11, 13, 16 VIN PGREF 20k 3 /FAULT 5 UVLOIN PWRGD 4 SLEW ILIM GND 10 *C SLEW use multiple values SLEW ...
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... TEMPERATURE ( C) V Reverse Current Flow BIAS vs. Output Voltage GND 1.6V BIAS –V (V) OUT BIAS SLEW Voltage vs. Temperature BIAS BIAS 1.6V IN BIAS 0 -40 - 100 TEMPERATURE ( C) MIC2044/2045 ...
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... MIC2044/2045 5. 220 5.0V IN BIAS R = 1.2 LOAD LOAD R = 100 SET 8 5V Turn-Off Latched Output Reset MIC2045 4.82V 5.0V IN BIAS R toggles from 2 to OPEN LOAD LOAD R = 220 SET TIME (50ms/div.) UVLO Response 1.45V V ramps LOAD LOAD ...
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... MIC2044/2045 Functional Characteristics (continued) Output Slew Response TIME (2.5ms/div.) October 2003 LOAD LOAD C = 0.033 F SLEW R = 220 SET 9 Thermal Shutdown Response 5.0V IN BIAS LOAD LOAD R = 220 SET TIME (100ms/div.) MIC2044/2045 Micrel ...
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... SLEW Input 2 EN Logic OSC MIC2044/45 MIC2044/2045 V = 230mV REF Bandgap Reference Thermal Shutdown + Gate UVLO Control + Charge Pump Power-On Latch Reset (MIC2045 VBIAS 7,11,13,16 Power-Off VIN Reset 9,12,14 VOUT Replica Amp + Current Limit I 6 ILIM LIM + Delay (32ms) Open Load Detect 3 /FAULT ...
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... If the fault condition persists longer than the delay period, typically 32ms, then the /FAULT output asserts low. At this point, the MIC2044 will continue to supply current to the load at the limiting value (I will latch off its output. ...
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... The MIC2044 automatically resets its output and resumes supplying current to the load when the die temperature drops to 120 C. If the fault is still present, the MIC2044 will quickly re-heat and shut down again. This process of turning ON-OFF-ON is called thermal cycling and will continue as long as the power switch is enabled while the fault or excessive load is present ...
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... VOUT) differential voltage and concludes a fault condition is present if the differential voltage exceeds 200mV for more than the flag delay period. For the MIC2045, the /FAULT will assert and the output will latch off if the output is not within 200mV of the input before the flag delay times out. ...
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... Under heavy loads, the switched current may cause the devices to heat up considerably. The following list contains some useful suggestions for PCB layout design of the MIC2044/45 in order to prevent the die from overheating under normal operating conditions. MIC2044/2045 m ...
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... Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify October 2003 16-Pin TSSOP (TS (408) 944-0970 FAX WEB Micrel for any damages resulting from such use or sale. © 2003 Micrel, Incorporated. 15 Rev. 01 http://www.micrel.com MIC2044/2045 Micrel ...