Datasheet LTC3100 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | 1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO |
| Páginas / Página | 26 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise … |
| Formato / tamaño de archivo | PDF / 413 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified. RUN Pin Threshold Voltage
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LTC3100
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified. RUN Pin Threshold Voltage Start-Up Delay Times vs VIN
0.625 450 400 BUCK 0.600 RISING 350 BOOST 300 0.575 250 Y TIME (µs) 200 0.550 FALLING LDO THRESHOLD (V) DELA 150 0.525 100 50 0.500 0 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 VIN (V) VIN (V) 3100 G27 3100 G28
PIN FUNCTIONS SWBST (Pin 1):
Switch Pin for the Boost Converter. nect a pull-up resistor from this pin to a positive supply Connect the boost inductor between SWBST and VINBST. less than 6V. Keep PCB trace lengths as short and wide as possible to
GND (Pin 7):
Signal Ground. Provide a short, direct PCB reduce EMI. If the inductor current falls to zero, an internal path between GND and the PC board ground plane con- anti-ringing switch is connected from SWBST to VINBST nected to the Exposed Pad. to minimize EMI.
RUNBK (Pin 8):
Logic-Controlled Shutdown Input for the
VBST (Pin 2):
Output Voltage for the Boost Converter Buck Converter. There is an internal 4MΩ pull-down on (which is the drain of the internal synchronous rectifier) this pin. and Input Voltage for the LDO. PCB trace length from VBST to the output filter capacitor (10µF minimum) should be RUNBK = High: Normal operation as short and wide as possible. RUNBK = Low: Shutdown
VLDO (Pin 3):
Output Voltage of the LDO Regulator. Connect
FBBK (Pin 9):
Feedback Input to the gm Error Amplifier a 1µF ceramic capacitor between V for the Buck Converter. Connect the resistor divider tap LDO and GND. Larger values of capacitance may be used for higher PSRR or to this pin. The output voltage can be adjusted from 0.6V improved transient response. to 5.5V by:
SWBK (Pin 4):
Switch Pin for the Buck Converter. Connect R6 V OUT _BUCK = 0.600V • 1+ the buck inductor between SWBK and the buck output R5 filter capacitor. Keep PCB trace lengths as short and wide as possible to reduce EMI.
RUNLDO (Pin 10):
Logic-Controlled Shutdown Input for the LDO Regulator. There is an internal 4MΩ pull-down
VINBK (Pin 5):
Input Voltage for the Buck Converter. Connect on this pin. a minimum of 4.7µF ceramic decoupling capacitor from this pin to ground. RUNLDO = High: Normal operation
PGBK (Pin 6):
Open-Drain Output That Pulls Low When RUNLDO = Low: Shutdown FBBK Is More Than 8% Below Its Regulated Voltage. Con- 3100fb For more information www.linear.com/LTC3100 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified. RUN Pin Threshold Voltage Start-Up Delay Times vs VIN
0.625 450 400 BUCK 0.600 RISING 350 BOOST 300 0.575 250 Y TIME (µs) 200 0.550 FALLING LDO THRESHOLD (V) DELA 150 0.525 100 50 0.500 0 1 1.5 2 2.5 3 3.5 4 4.5 5 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 VIN (V) VIN (V) 3100 G27 3100 G28
PIN FUNCTIONS SWBST (Pin 1):
Switch Pin for the Boost Converter. nect a pull-up resistor from this pin to a positive supply Connect the boost inductor between SWBST and VINBST. less than 6V. Keep PCB trace lengths as short and wide as possible to
GND (Pin 7):
Signal Ground. Provide a short, direct PCB reduce EMI. If the inductor current falls to zero, an internal path between GND and the PC board ground plane con- anti-ringing switch is connected from SWBST to VINBST nected to the Exposed Pad. to minimize EMI.
RUNBK (Pin 8):
Logic-Controlled Shutdown Input for the
VBST (Pin 2):
Output Voltage for the Boost Converter Buck Converter. There is an internal 4MΩ pull-down on (which is the drain of the internal synchronous rectifier) this pin. and Input Voltage for the LDO. PCB trace length from VBST to the output filter capacitor (10µF minimum) should be RUNBK = High: Normal operation as short and wide as possible. RUNBK = Low: Shutdown
VLDO (Pin 3):
Output Voltage of the LDO Regulator. Connect
FBBK (Pin 9):
Feedback Input to the gm Error Amplifier a 1µF ceramic capacitor between V for the Buck Converter. Connect the resistor divider tap LDO and GND. Larger values of capacitance may be used for higher PSRR or to this pin. The output voltage can be adjusted from 0.6V improved transient response. to 5.5V by:
SWBK (Pin 4):
Switch Pin for the Buck Converter. Connect R6 V OUT _BUCK = 0.600V • 1+ the buck inductor between SWBK and the buck output R5 filter capacitor. Keep PCB trace lengths as short and wide as possible to reduce EMI.
RUNLDO (Pin 10):
Logic-Controlled Shutdown Input for the LDO Regulator. There is an internal 4MΩ pull-down
VINBK (Pin 5):
Input Voltage for the Buck Converter. Connect on this pin. a minimum of 4.7µF ceramic decoupling capacitor from this pin to ground. RUNLDO = High: Normal operation
PGBK (Pin 6):
Open-Drain Output That Pulls Low When RUNLDO = Low: Shutdown FBBK Is More Than 8% Below Its Regulated Voltage. Con- 3100fb For more information www.linear.com/LTC3100 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts