MIC2182-3.3YM Micrel Inc, MIC2182-3.3YM Datasheet
MIC2182-3.3YM
Specifications of MIC2182-3.3YM
MIC2182-3.3YM
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MIC2182-3.3YM Summary of contents
Page 1
... The MIC2182 operates from a 4.5V to 32V input and can operate with a maximum duty cycle of 86% for use in low- dropout conditions. It also features a shutdown mode that reduces quiescent current to 0 ...
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... MIC2182 Ordering Information Part Number MIC2182BM MIC2182-3.3BM MIC2182-5.0BM MIC2182BSM MIC2182-3.3BSM MIC2182-5.0BSM MIC2182YM MIC2182-3.3YM MIC2182-5.0YM MIC2182YSM MIC2182-3.3YSM MIC2182-5.0YSM Pin Configuration MIC2182 SS 1 PWM 2 COMP 3 SGND 4 SYNC 5 EN/UVLO CSH 8 Adjustable 16-pin SOP (M) 16-Pin SSOP (SM) M9999-042204 Voltage Temperature Range Adjustable – +85 C 3.3V – +85 C 5.0V – ...
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... MIC2182 Pin Description Pin Number Pin Name PWM 3 COMP 4 SGND 5 SYNC 6 EN/UVLO 7 (fixed) VREF 7 (adj CSH 9 VOUT 10 VIN 11 VDD 12 PGND 13 LSD 14 BST 15 VSW 16 HSD April 22, 2004 Pin Function Soft-Start (External Component): Connect external capacitor to ground to reduce inrush current by delaying and slowing the output voltage rise time. ...
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... ESD, Note 3 Electrical Characteristics V = 15V open 0V PWM SHDN noted Parameter Condition MIC2182 [Adjustable], (Note 5) Feedback Voltage Reference Feedback Voltage Reference Feedback Voltage Reference 4.5V < V Feedback Bias Current Output Voltage Range Output Voltage Line Regulation V IN Output Voltage Load Regulation 25mV < (V Output Voltage Total Regulation 0mV < ...
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... MIC2182 Parameter Condition Reference Output (Fixed Versions Only) Reference Voltage Reference Line Regulation 6V < V Reference Load Regulation 0 A < I Enable/UVLO Enable Input Threshold UVLO Threshold Enable Input Current V EN/UVLO Soft Start Soft-Start Current V SS Current Limit Current-Limit Threshold Voltage V CSH Error Amplifier ...
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... MIC2182 Typical Characteristics Quiescent Current vs. Temperature 2.0 1.8 PWM 1.6 1.4 1.2 1.0 0.8 Skip 0.6 0.4 0.2 0 -40 - 100120140 TEMPERATURE ( C) Quiescent Current vs. Supply Voltage 1.5 1.0 UVLO Mode 0.5 (mA) 0 0.5 -0.5 0.4 SHUTDOWN ( A) 0.3 0.2 0 SUPPLY VOLTAGE (V) V (Fixed Versions) REF vs ...
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... MIC2182 Soft-Start Current vs. Temperature 5.0 4.8 4.6 4.4 4.2 4.0 -40 - 100120140 TEMPERATURE ( C) April 22, 2004 Overcurrent Threshold vs. Temperature 0.12 0.11 0.10 0.09 0.08 -40 - 100120140 TEMPERATURE ( C) 7 Micrel Current-Limit Foldback 3.3V OUT R = 15m OUTPUT CURRENT (A) M9999-042204 ...
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... MIC2182 Block Diagrams EN/UVLO Control Logic PWM 2 PWM CORRECTIVE RESET RAMP SYNC Oscillator 5 COMP 3 C COMP R COMP MIC2182 [adj.] M9999-042204 V DD Reference V IN Current Limit PWM Mode to Skip Mode 0.024V Skip-Mode Current Limit 0.07V Low Comp –2%V BG Hysteresis Comp Current Sense ...
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... MIC2182 EN/UVLO Control Logic PWM 2 PWM CORRECTIVE RESET RAMP SYNC Oscillator 5 COMP 3 C COMP R COMP MIC2182-x.x April 22, 2004 V DD Reference V IN Current Limit PWM Mode to Skip Mode 0.024V Skip-Mode Current Limit 0.07V Low Comp –2%V BG Hysteresis Comp Current Sense Amp Error ...
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... An internal corrective ramp provides slope compensation for stable operation above a 50% duty cycle. The controller is optimized for high-efficiency, high-performance dc-dc con- verter applications. The MIC2182 block diagrams are shown in Figure 2a and Figure 2b. The MIC2182 controller is divided into 6 functions. • Control loop ...
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... IC is not switching. The disadvantage of this method is greater output voltage ripple and variable switching frequency. A block diagram of the MIC2182 skip mode is shown in Figure 4. Skip mode voltage and current waveforms are shown in figure 5B. V ...
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... MIC2182 Reset Pulse V HSD V LSD V HSD V LSD one-shot V OUT I OUT A hysteretic comparator is used in place of the PWM error amplifier and a current-limit comparator senses the inductor current. A one-shot starts the switching cycle by momentarily turning on the low side MOSFET to insure the high-side drive boost capacitor, Cbst, is fully charged. The high-side MOS- FET is turned on and current ramps up in the inductor, L1 ...
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... The reference voltage in the fixed-output-voltage versions of the MIC2182 is buffered and brought to pin 7. The V (pin 4) with a 0.1 F capacitor. The adjustable version of the MIC2182 uses pin 7 for output voltage sensing. A decoupling capacitor on pin 7 is not used in the adjustable output voltage version. in Figure 2.). The cur- ...
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... MIC2182 The enable pin (pin 6) has two threshold levels, allowing the MIC2182 to shut down in a low current mode, or turn off output switching in UVLO mode. An enable pin voltage lower than the shutdown threshold turns off all the internal circuitry and reduces the input current to typically 0.1 A. ...
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... A minimum load is required to prevent the output from rising up. This will not occur for output voltages greater than 3V. Figure 11 should be used as a guide when the MIC2182 is forced into PWM-only mode. The actual maximum input voltage will depend on the exact external components used (MOSFETs, inductors, etc ...
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... This change in resistance must be accounted for when calculating MOSFET power dissipation. Total gate charge is the charge required to turn the MOSFET on and off under specified operating conditions ( The gate charge is supplied by the MIC2182 gate drive GS circuit. At 300kHz switching frequency and above, the gate 16 2 ...
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... MIC2182 charge can be a significant source of power dissipation in the MIC2182. At low output load this power dissipation is notice- able as a reduction in efficiency. The average current re- quired to drive the high-side MOSFET is G[high-side](avg where G[high-side](avg) average high-side MOSFET gate current Q = total gate charge for the high-side MOSFET G taken from manufacturer’ ...
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... MIC2182 For the low-side switch (N-channel MOSFET), the dc power dissipation is (rms) switch2(dc) DS(on Since the ac switching losses for the low side MOSFET is near zero, the total power dissipation is low-side MOSFET(max) switch2(dc) The total power dissipation for the high-side MOSFET is highsideMOSFET(max) SWITCH 1(dc) ...
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... Use a low gate-charge MOSFET or use the smallest MOSFET, which is still adequate for maximum output current. • Allow the MIC2182 to run in skip mode at lower currents. • Use a ferrite material for the inductor core, which has less core loss than an MPP or iron power core ...
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... MOSFETs turn on and off must be kept away from the small signal connections. • The connection between the current-sense resistor and the MIC2182 current-sense inputs (pin 8 and 9) should have separate traces, routed from the terminals directly to the IC pins. The traces should be routed as closely as possible to each other and their length should be minimized ...
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... Sumida April 22, 2004 Power supplies larger than 10A can also be constructed using the MIC2182 using larger power-handling compo- nents. The “Power Supply Operating Characteristics” graphs follow- ing the component and vendor tables provide useful informa- tion about the actual performance of some of these circuits. ...
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... Si4884, Siliconix, high-side MOSFET high-side MOSFET qty: 1 qty: 1 WSL-2010 .020 1%, WSL-2512 .015 1%, Vishay, 0.02, 1%, 0.5W, Vishay, 0.015, 1%, 1W, current sense resistor current sense resistor MIC2182-5.0BSM or MIC2182-5.0BSM or MIC2182-5.0BM MIC2182-5.0BM Table 3. Components for 5V Output 4A (4.5V–30V) 5A (4.5V–30V) Part No. / Description Part No. / Description qty: 2 qty: 2 ...
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... MOSFET high-side MOSFET qty: 1 qty: 1 WSL-2010 .020 1%, WSL-2512 .015 1%, Vishay, 0.02, 1%, 0.5W, Vishay, 0.015, 1%, 1W, current sense resistor current sense resistor MIC2182BSM or MIC2182BSM or MIC2182BM MIC2182BM Table 5. Components for 2.5V Output 4A (4.5V–30V) 5A (4.5V–8V) Part No. / Description Part No. / Description qty: 2 qty: 2 ...
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... MIC2182 Power Supply Operating Characteristics Effect of Soft-Start Capacitor (C On Output Voltage Waveforms During Turn-On (10A Power Supply Configuration) Normal (300kHz Switching Frequency) and Output Short-Circuit (60kHz) Conditions Switch Node (Pin 15) Waveforms Typical Skip-Mode Waveforms M9999-042204 ) Value SS 24 Effect of Soft-Start Capacitor (C ) Value ...
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... MIC2182 Load Transient Response and Bode Plot (4A Power Supply Configuration) Bode Plot (4A Power Supply Configuration) 100 210 80 180 60 150 GAIN 40 120 PHASE -20 30 -40 0 FREQUENCY (Hz) 12V Efficiency (4A Power Supply Configuration) 100 PWM 80 Skip 12V 15m high-side MOSFET: Si4800 1 low-side MOSFET: Si4800 0 0 ...
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... MIC2182 Package Information 0.157 (3.99) 0.150 (3.81) 0.020 (0.51) REF 0.0648 (1.646) 0.0434 (1.102) 6.33 (0.239) 6.07 (0.249) 0.38 (0.015) 0.25 (0.010) 0.65 (0.0260) BSC M9999-042204 PIN 1 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) ...
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... MIC2182 April 22, 2004 27 Micrel M9999-042204 ...
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... MIC2182 MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...