MIC2150/MIC2151 2-Phase Dual Output PWM Synchronous Buck Control IC General Description Features The MIC2150/1 are simple 2-phase dual-output Dual Synchronous Buck Control IC with outputs synchronous buck control ICs featuring small size and high switching 180 degree out-of-phase efficiency. The ICs implement PWM control at 500kHz 4.5V to 14.5V input voltage range (MIC2150) or 300kHz (MIC2151), with the outputs Adjustable output voltages down to 0.7V switching 180 out of phase. The result of the out-of-phase 1% output voltage accuracy operation is 1MHz input ripple frequency with ripple current MIC2150: 500kHz PWM operation cancellation, minimizing the required input filter capacitance. A 1% output voltage tolerance allows the MIC2151: 300kHz PWM operation maximum level of system performance. Internal drivers Adaptive gate drive allows efficiencies over 95% with adaptive gate drive allow the highest efficiency with Adjustable current limit with no sense resistor the minimum external components. - Senses low-side MOSFET current A dual threshold enable pin, matched soft-start pins, and a Internal drivers allow 20A per phase power good output are provided, allowing a high level of Power Good output allow simple sequencing control. The MIC2150/1 are available in the small size 4mm4mm Dual threshold enable pin 24-pin MLF package. The MIC2150/1 has a junction Independent programmable soft-start pins operating range from 40C to +125C. Output over-voltage protection Data sheets and support documentation can be found on Input UVLO Micrels web site at www.micrel.com. Works with ceramic output capacitors Applications Tiny 4mm4mm 24-Pin MLF package Multi-output power supplies with sequencing Junction temperature range of -40C to +125C DSP, FPGA, CPU and ASIC power supplies Telecom and Networking equipment Servers Typical Application MicroLead Frame and MLF are registered trademarks of Amkor Technology, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2150 Ordering Information Junction Temp. Part Number Frequency Voltage Lead Finish Package Range MIC2150YML 500kHz Adj. 40C to +125C Pb-Free 4mm4mm 24-pin MLF Adj. Pb-Free 4mm4mm 24-pin MLF MIC2151YML 300kHz 40C to +125C Pin Configuration 24-Pin MLF (ML) Pin Description Pin Number Pin Name Pin Function 1 BS1 Boost 1(Input): Provides voltage for high-side MOSFET driver 1. The gate drive voltage is higher than the source voltage by V minus a diode drop. DD 2 HSD1 High-Side Drive 1 (Output): High current output-driver for ext. high-side MOSFET. 3 SW1 Switch Node 1(Output): High current output driver return for HSD1. 4 CS1 Current Sense 1 (Input): Current-limit comparator non-inverting input. The current limit is sensed across the low-side FET during the ON-time. Current limit is set by the resistor in series with the CS1 pin. 5 SS1 Soft-start, Output 1(Input): Controls the turn-on time of the output voltage. Active at power-up, Enable and Current Limit recovery. 6 COMP1 Compensation 1 (Input): Pin for external compensation, Channel 1. 7 AGND Analog Ground (Signal): Signal path return for FB, EN, PGOOD, AVDD, SS and COMP. 8 FB1 Feedback 1 (Input): Input to Channel 1 error amplifier. Regulates to 0.7V. 9 AVDD Analog Supply Voltage (Input): Connect ext. bypass capacitor. 10 FB2 Feedback 2 (Input): Input to Channel 2 error amplifier. Regulates to 0.7V. 11 PGOOD Power Good (Output): Indicates Channel 1 output AND Channel 2 output > 90% Nominal. 12 COMP2 Compensation 2 (Input): Pin for external compensation, Channel 2. M9999-082809-A August 2009 2 (408) 944-0800