DC424A Analog Devices

DEMO BOARD QUICK START GUIDE DC424 2-PHASE, DUAL-OUTPUT SWITCHING REGULATOR CONTROLLER LTC3701 DESCRIPTION Demonstration Circuit DC424 provides ing a voltage in the range from 0V to 2.5V/1.6A and 1.8V/1.6A using the 2.4V to the PLLLPF pin. LTC3701 2-phase, dual-output switch- Gerber files for this circuit board ing regulator controller. The input are available. Call the LTC factory. range is from 2.5V to 9.8V. Operating the two controller channels 180 out Table 1. Performance Summary of phase significantly reduces peak (Operating Temperature Range: 40 C to 85 C) input ripple current thereby reduc- PARAMETER CONDITION VALUE ing radiated and conducted EMI. Out- Input Voltage 2.5V to put voltages can be externally set to Range 9.8V as low as 0.8V. The board is opti- V = 2.5V 0 to 2.5V OUT1 Outputs mized for small size and low cost. 1.6A 3% Higher output current can be easily V = 1.8V 0 to 1.8V OUT2 achieved by changing external compo- 1.6A 3% nents. For example, maximum output Typical Output 10MHz BW 1.6A Load current can be increased to 2A if Mu- 26mV PP Ripple V = 5V IN rata LQH55DN4R7M01 inductors are used Typical Oper- at the L1 and L2 locations. ating Fre- PLLLPF Pin Floating 550kHz quency Switching frequency is internally set at 550kHz, allowing the use of small Typical Shut- down V = 5V 15A IN inductors and capacitors. For noise Current sensitive applications, an external Typical V = 5V RUN1 and clock can be applied to synchronize IN Standby RUN2 are on No Load 310A from 300kHZ to 750kHz. The frequency Current Current can also be externally set by apply- QUICK START PROCEDURE Refer to Figure 1 for equipment channel(s) by setting JP1 and JP2 requirements and proper setup. to the run position. 1. Apply a voltage source to the input 3. Connect the load at each output. of the circuit between the Vin and The board can supply up to 1.6A for GND terminals. The circuit will each output. Higher output currents start up at input voltage higher are possible by changing external than 2.5V. Do not apply more than components. 9.8V to the input. 4. Proper hook-up is essential for ac- 2. Attach voltmeters or oscilloscope curate and meaningful evaluation of probes between V V and their efficiency and regulation. Figure 1 OUT1, OUT2 closest GND terminals to monitor shows the appropriate arrangement the outputs. Switch on the desired of supply, loads, ammeters and voltmeters. 1 DEMO BOARD QUICK START GUIDE DC424 2-PHASE, DUAL-OUTPUT SWITCHING REGULATOR CONTROLLER + + LOAD + + + BENCH SUPPLY + + + LOAD Figure 1. Proper Measurement Equipment Setup 2 +