Datasheet LT1110 (Linear Technology) - 5
| Manufacturer | Linear Technology |
| Description | Micropower DC-DC Converter Adjustable and Fixed 5V, 12V |
| Pages / Page | 16 / 5 — TYPICAL PERFOR A CE CHAR C. A TERISTICS. Set Pin Bias Current. FB Pin … |
| File Format / Size | PDF / 323 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHAR C. A TERISTICS. Set Pin Bias Current. FB Pin Bias Current. Reference Voltage. FU CTI. ILIM (Pin 1):
Model Line for this Datasheet
Text Version of Document
LT1110
W U TYPICAL PERFOR A CE CHAR C A TERISTICS Set Pin Bias Current FB Pin Bias Current Reference Voltage
160 120 226 110 140 224 100 120 90 222 80 100 70 220 80 60 (mV) REF 50 V 218 60 40 BIAS CURRENT (nA) BIAS CURRENT (nA) 216 40 30 20 20 214 10 0 0 212 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) LT1110 • TPC13 LT1110 • TPC14 LT1110 • TPC15
U U O U PI FU CTI S ILIM (Pin 1):
Connect this pin to VIN for normal use. Where
GND (Pin 5):
Ground. lower current limit is desired, connect a resistor between
AO (Pin 6):
Auxiliary Gain Block (GB) output. Open collector, ILIM and VIN. A 220Ω resistor will limit the switch current can sink 300µA. to approximately 400mA.
SET (Pin 7):
GB input. GB is an op amp with positive input
VIN (Pin 2):
Input supply voltage. connected to SET pin and negative input connected to
SW1 (Pin 3):
Collector of power transistor. For step-up 220mV reference. mode connect to inductor/diode. For step-down mode
FB/SENSE (Pin 8):
On the LT1110 (adjustable) this pin connect to VIN. goes to the comparator input. On the LT1110-5 and
SW2 (Pin 4):
Emitter of power transistor. For step-up LT1110-12, this pin goes to the internal application resistor mode connect to ground. For step-down mode connect to that sets output voltage. inductor/diode. This pin must never be allowed to go more than a Schottky diode drop below ground.
W LT1110 BLOCK I D AGRA
SET + A2 AO – VIN GAIN BLOCK/ERROR AMP ILIM SW1 220mV REFERENCE A1 OSCILLATOR Q1 DRIVER COMPARATOR GND SW2 FB LT1110 • BD01 5
W U TYPICAL PERFOR A CE CHAR C A TERISTICS Set Pin Bias Current FB Pin Bias Current Reference Voltage
160 120 226 110 140 224 100 120 90 222 80 100 70 220 80 60 (mV) REF 50 V 218 60 40 BIAS CURRENT (nA) BIAS CURRENT (nA) 216 40 30 20 20 214 10 0 0 212 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) LT1110 • TPC13 LT1110 • TPC14 LT1110 • TPC15
U U O U PI FU CTI S ILIM (Pin 1):
Connect this pin to VIN for normal use. Where
GND (Pin 5):
Ground. lower current limit is desired, connect a resistor between
AO (Pin 6):
Auxiliary Gain Block (GB) output. Open collector, ILIM and VIN. A 220Ω resistor will limit the switch current can sink 300µA. to approximately 400mA.
SET (Pin 7):
GB input. GB is an op amp with positive input
VIN (Pin 2):
Input supply voltage. connected to SET pin and negative input connected to
SW1 (Pin 3):
Collector of power transistor. For step-up 220mV reference. mode connect to inductor/diode. For step-down mode
FB/SENSE (Pin 8):
On the LT1110 (adjustable) this pin connect to VIN. goes to the comparator input. On the LT1110-5 and
SW2 (Pin 4):
Emitter of power transistor. For step-up LT1110-12, this pin goes to the internal application resistor mode connect to ground. For step-down mode connect to that sets output voltage. inductor/diode. This pin must never be allowed to go more than a Schottky diode drop below ground.
W LT1110 BLOCK I D AGRA
SET + A2 AO – VIN GAIN BLOCK/ERROR AMP ILIM SW1 220mV REFERENCE A1 OSCILLATOR Q1 DRIVER COMPARATOR GND SW2 FB LT1110 • BD01 5
