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LT1308 Datasheet(PDF) 7 Page - Linear Technology |
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LT1308 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 8 page  7 LT1308 APPLICATIONS INFORMATION DECT PHONES The DECT standard specifies a transmit pulse 416 µs in duration. The LT1308 is capable of delivering a 400mA pulse load from a 1.2V input with output capacitance of 100 µF. Figure 11 depicts VOUT transient response of Figure 6’s circuit, configured for a 3.3V output by chang- ing resistor R1 to 169k. Figure 12 shows detail of one transmit pulse at a higher sweep speed. VIN SW FB LT1308 L1 4.7 µH D1 MBRS120 LBO LBI 47k 100k 5V/1A OR 3.3V/300mA R1 33nF 1308F06 C1 10 µF CERAMIC C2 100 µF NiCd OR Li-Ion CELL VC GND SHDN L1: TOKO 636CY4R7M COILTRONICS CTX5-1 FOR VOUT = 5V: R1 = 309k FOR VOUT = 3.3V: R1 = 169k + Figure 6. DC/DC Converter for GSM/DECT Application 1ms/DIV 1308 F08 100 µs/DIV 1308 F07 Figure 7. GSM Load Transient Response. 100mA to 1A Transient Response for Figure 6’s Circuit. Pulse Width = 577 µs VOUT 200mV/DIV AC COUPLED VIN = 3.6V IL, 1A/DIV 1A 100mA VIN = 3.6V 100mA VOUT 200mV/DIV AC COUPLED 1A Figure 8. GSM Load Transient Response. Slower Sweep Speed (1ms/DIV) Shows VOUT over Several Transmit Pulses 100mA ILOAD 1A VOUT 200mV/DIV AC COUPLED VIN = 2.7V 1ms/DIV 1308 F09 Figure 9. GSM Load Transient Response. At Low VIN, Large Output Capacitor (2200µF) Serves to Hold up VOUT 100 µs/DIV 1308 F09 Figure 12. DECT Load Transient Response. Faster Sweep Speed (100 µs/DIV) Details VOUT and Inductor Current of Single DECT Transmit Pulse VOUT 200mV/DIV AC COUPLED 400mA IL, 1A/DIV 2ms/DIV 1308 F11 VOUT 200mV/DIV AC COUPLED 400mA 50mA ILOAD Figure 11. DECT Load Transient Response. With a Single NiCd Cell the LT1308 Provides 3.3V with 400mA Pulsed Load. Pulse Width = 416 µs VOUT 200mV/DIV AC COUPLED IL, 1A/DIV 1A 100mA ILOAD VIN = 2.7V 500 µs/DIV 1308 F10 Figure 10. GSM Load Transient Response. Faster Sweep Speed (500 µs/DIV) Details VOUT and Inductor Current of One Transmit Pulse VIN = 1.2V VIN = 1.2V ILOAD ILOAD 50mA ILOAD |
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