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 T = 25C A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VBUS Bus Input Voltage Range 4.35 6 V V(LDO3V3) 3.3V LDO Output VOUT > 3.5V 3.1 3.4 V LTC4160 Constant Voltage Mode 4.15 4.23 V V(BAT) Battery Float Voltage LTC4160-1 Constant Voltage Mode 4.05 4.13 I(BAT) Battery Charge Current Constant Current Mode, R = 2.00k 485 515 mA PROG ILIM 1..0 = 01b, I(VOUT) 1.25A, V(BAT) > 3.6V V(BAT) VBAT + 0.45V V VOUT Output Voltage I(VOUT) 1.25A, V(BAT) < 3.6V 3.6V V V VBUS voltage in OTG mode I(VBUS) -500mA 4.5 5 5.5 V OTG QUICK START PROCEDURE Refer to Figure 1 for the proper measurement proximately 400mA, but will be limited by the in- equipment setup and jumper settings and follow the put current limiter to ~ 100mA. procedure below. 2. Increase LD3 to 80mA, and LD2 to 25mA. Ob- NOTE. When measuring the input or output voltage ripple, care serve VOUT(VM4), I(VUSB) (AM1) and LDO3V3 must be taken to avoid a long ground lead on the oscilloscope (VM3). Set LD2 to 0A. The loads on VOUT and probe. Measure the input or output voltage ripple by touching the probe tip directly across the VBUS or VOUT(x) and GND terminals. LDO3V3 are now reducing the charge current See Figure 2 for proper scope probe technique. further. 3. Increase LD3 to 250mA. Observe VOUT(VM4), 1. Set all jumpers as shown in Figure 1 and LD1 = I(VUSB) (AM1). The load on VOUT will engage 0A, PS1 = 5V, LD2 = 0A, LD3 = 0A, PS2 = 3.6V. the input current limit, and VOUT will drop until Observe VOUT (VM4), LDO3V3 (VM3), and the ideal diode engages to provide the difference V(NTC) (VM2). The LTC4160 is operating as current. USB power manager. The current from PS1 will try to be the charging current * (3.6V/5V), or ap- 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 ex- ceeds the input current limit and the VOUT volt- age 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 cur- rent 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-The- Go mode is enabled, and the LTC4160 is provid- ing 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