MIC2179-3.3YSM Micrel Inc, MIC2179-3.3YSM Datasheet
MIC2179-3.3YSM
Specifications of MIC2179-3.3YSM
MIC2179-3.3YSM
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MIC2179-3.3YSM Summary of contents
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... The Micrel MIC2179 is a 200kHz synchronous buck (step- down) switching regulator designed for high-efficiency, bat- tery-powered applications. The MIC2179 operates from a 4.5V to 16.5V input and features internal power MOSFETs that can supply up to 1.5A output current. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions. It also features a shutdown mode that reduces quiescent current to less than 5µ ...
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... Ordering Information Part Number Standard* Pb-Free MIC2179BSM MIC2179YSM MIC2179-3.3BSM MIC2179-3.3YSM MIC2179-5.0BSM MIC2179-5.0YSM * Standard product will be supported as Pb-Free IAW PCCN #040004 effective 1-1-2005 pending residual depletion. Pin Configuration Pin Description Pin Number Pin Name 1, 2, 19, 20 PGND 3 5 PWM 6 PWRGD 7 8 COMP 9– ...
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... PWM mode, output not switching, 4.5V ≤ V ≤ 16.5V IN skip mode, output not switching, 4.5V ≤ V ≤ 16. 0V, 4.5V ≤ V ≤ 16. 16.5V IN MIC2179 [adj.]: V = 3.3V, I OUT MIC2179 [adj.]: V = 3.3V, OUT 5V ≤ V ≤ 16V, 10mA ≤ MIC2179-5. LOAD MIC2179-5.0: 6V ≤ V ≤ 16V, 10mA ≤ MIC2179-3 ...
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... The device is not guaranteed to function outside its operating rating. 3. Specification for packaged product only. General. Devices are ESD sensitive. Handling precautions recommended. June 2009 Condition 5. 5.5V PWM MIC2179 [adj.]: measured at FB pin MIC2179-5.0: measured at FB pin MIC2179-3.3: measured at FB pin I = 1.0mA SINK V = 5.5V PWRGD 4 Min ...
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... TEMPERATURE (°C) PWM-Mode Supply-Current 12 OUTPUT 10 SWITCHING INPUT VOLTAGE (V) June 2009 Reference Voltage vs. Temperature 1.252 MIC2179 [adj.] 1.250 1.248 1.246 1.244 1.242 1.240 1.238 -60 - 120 150 TEMPERATURE (°C) Error-Amplifier Gain vs. Temperature 19.0 18.5 18.0 17.5 17.0 16.5 16.0 -60 - 120 150 TEMPERATURE (° ...
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... Voltage PWM PWM/ Skip Mode Skip-Mode PWM Mode 5 Select Corrective Ramp SYNC 200kHz Stop Oscillator 13 Reset Pulse R C COMP MIC2179 [Adjustable] June 2009 Output Control Logic I LIMIT Comp. I LIMIT Thresh. Voltage Skip-Mode Comp PWM Comp. V 1.245V REF SGND 9 10 ...
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... Shutdown Mode The MIC2179 has a low-current shutdown mode that is con- trolled by the enable input (EN). When a logic 0 is applied to EN, the MIC2179 is in shutdown mode, and its quiescent current drops to less than 5µA. Internal Bias Regulator An internal 3.3V regulator provides power to the MIC2179 control circuits. This internal supply is brought out to the BIAS pin for bypassing by an external 0.01µ ...
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... OUT and multimedia circuits. There are two important items to be aware of when selecting PWM or skip mode. First, the MIC2179 can start-up only in PWM mode, and therefore requires a logic low at PWM dur- ing start-up. Second, in skip mode, the MIC2179 will supply a maximum load current of approximately 300mA, so the output will drop out of regulation when load current exceeds this limit ...
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... PWM-Mode Functional Diagram Corrective Ramp 200kHz Stop Oscillator 13 Reset Pulse MIC2179 [Adjustable] PWM-Mode Signal Path Reset Pulse Error Amp. Output June 2009 Amp. R PWM S Comp. Error Amp. V 1.245V LOAD 4.5V to 16. VIN 1.245 + 1 OUT R2 110mΩ P-channel 110mΩ P GND N-channel ...
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... Skip-Mode Functional Diagram Output Control Logic MIC2179 [Adjustable] Skip-Mode Signal Path One-Shot Pulse 5mV – 5mV June 2009 One Shot Amp. I LIMIT Comp. I LIMIT Thresh . Voltage Skip-Mode Comp. V 1.245V LIM 4.5V to 16. VIN 1.245 + 1 110mΩ OUT R2 P-channel GND M9999-063009 ...
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... Application Information Feedback Resistor Selection (Adjustable Version) The output voltage is programmed by connecting an external resistive divider to the FB pin as shown in “MIC2179 Block Diagram.” The ratio determines the output voltage. To optimize efficiency during low output current operation, R2 should not be less than 20kΩ. However, to prevent feedback error due to input bias current at the FB pin, R2 should not be greater than 100kΩ ...
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... June 2009 currents returning to the power supply ground bus. SGND and PGND should be tied together by a ground plane that extends under the MIC2179. Diodes General Instruments (GI) 10 Melville Park Rd. Melville, NY 11747 tel: (516) 847-3222 fax: (516) 847-3150 International Rectifier Corp ...
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... Package Information MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 tel This 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. ...