DEMO CIRCUIT 1463A QUICK START GUIDE LTC4160EPDC / LTC4160EPDC-1 Switching Power Manager with USB On-the-Go and Overvoltage Protection DESCRIPTION Demonstration Circuit DC1463A is a Switching Power Manager with USB On-the-Go and Overvoltage Protection featuring the LTC®4160. PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL PARAMETER VBUS Bus Input Voltage Range V(LDO3V3) 3.3V LDO Output V(BAT) I(BAT) Battery Float Voltage Battery Charge Current VOUT Output Voltage VOTG VBUS voltage in OTG mode CONDITIONS VOUT > 3.5V LTC4160 Constant Voltage Mode LTC4160-1 Constant Voltage Mode Constant Current Mode, RPROG = 2.00k ILIM[1..0] = 01b, I(VOUT) ≤ 1.25A, V(BAT) > 3.6V I(VOUT) ≤ 1.25A, V(BAT) < 3.6V I(VBUS) ≤ -500mA MIN 4.35 3.1 4.15 4.05 485 V(BAT) 3.6V 4.5 TYP 5 MAX UNITS 6 V 3.4 V 4.23 V 4.13 515 mA VBAT + 0.45V V V 5.5 V QUICK START PROCEDURE Refer to Figure 1 for the proper measurement equipment setup and jumper settings and follow the procedure below. NOTE. When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VBUS or VOUT(x) and GND terminals. See Figure 2 for proper scope probe technique. 1. Set all jumpers as shown in Figure 1 and LD1 = 0A, PS1 = 5V, LD2 = 0A, LD3 = 0A, PS2 = 3.6V. Observe VOUT (VM4), LDO3V3 (VM3), and V(NTC) (VM2). The LTC4160 is operating as USB power manager. The current from PS1 will try to be the charging current * (3.6V/5V), or ap- proximately 400mA, but will be limited by the input current limiter to ~ 100mA. 2. Increase LD3 to 80mA, and LD2 to 25mA. Observe VOUT(VM4), I(VUSB) (AM1) and LDO3V3 (VM3). Set LD2 to 0A. The loads on VOUT and LDO3V3 are now reducing the charge current further. 3. Increase LD3 to 250mA. Observe VOUT(VM4), I(VUSB) (AM1). The load on VOUT will engage the input current limit, and VOUT will drop until the ideal diode engages to provide the difference current. 1 LTC4160EPDC/LTC4160EPDC-1 4. Change JP1 & JP2 to ‘1’. Observe VOUT(VM4) and I(VUSB) (AM1). The input current limit is now 500mA, and the load on VOUT is 250mA, so the battery charge current will be approximately 250mA. 5. Increase LD3 to 750mA. Observe VOUT(VM4) and I(VUSB)(AM1). The load on VOUT again exceeds the input current limit and the VOUT voltage will drop until the ideal diode turns on and supplies current from the battery. 6. Change JP1 to ‘0’. Observe VOUT(VM4) and I(VUSB) (AM1). The input current limit is now 1A, and the battery is charging at 250mA. VOUT is loaded at 750mA, so only the remaining current is available to charge the battery. 7. Increase LD3 to 1.25A. Observe VOUT(VM4) and I(VUSB) (AM1). Set LD3 to 0A. Observe I(BAT) (AM4).The input current limit is activated and VOUT will drop until the ideal diode turns on. 8. Increase PS2 until I(BAT) is less than 25mA. Observe V(BAT) (VM5). Set PS2 to 3.6V. 9. Disconnect PS1. Change JP3 (ENOTG) to ‘ON’. Observe VUSB (VM1) and V(CLPROG)(VM6). Although PS1 is disconnected, the USB On-TheGo mode is enabled, and the LTC4160 is providing VUSB from the battery. 10. Increase LD1 to 500mA. Observe VUSB(VM1) and V(CLPROG)(VM6). In On-The-Go mode the LTC4160 can provide 500mA of output current on the USB. 11. Reset the Jumpers to their default position. 2 LTC4160EPDC/LTC4160EPDC-1 Figure 1. Proper Measurement Equipment Setup for DC1463A GND VIN Figure 2. Measuring Input or Output Ripple 3 LTC4160EPDC/LTC4160EPDC-1 Figure 3. Circuit Schematic 4 LTC4160EPDC/LTC4160EPDC-1 Figure 4. Bill of Materials 5