LTC1869IGN, LTC1871, LTC1871-7 Selling Leads, Datasheet
MFG:LT Package Cooled:SSOP-16 D/C:0409+
LTC1869IGN, LTC1871, LTC1871-7 Datasheet download
Part Number: LTC1869IGN
MFG: LT
Package Cooled: SSOP-16
D/C: 0409+
LTC1869IGN, LTC1871, LTC1871-7
- Table of contents:
Info of LTC1869IGN
Info of LTC1871
Info of LTC1871-7
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About LTC0157
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Datasheet: LTC0157
File Size: 163926 KB
Manufacturer: ETC [ETC]
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About LTC1871
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Datasheet: LTC1871
File Size: 421693 KB
Manufacturer: Linear
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About LTC1871-7
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Datasheet: LTC1871-7
File Size: 207247 KB
Manufacturer: Linear
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LTC1871 General Description
The LTC® 1871 is a wide input range, current mode, boost, flyback and SEPIC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to medium power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET's on-resistance, thereby maximizing efficiency.
The IC's operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10µA make the LTC1871 ideally suited for battery-operated systems.
For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/ SYNC pin. Higher output voltage boost, SEPIC and flyback applications are possible with the LTC1871 by connecting the SENSE pin to a resistor in the source of the power MOSFET.
The LTC1871 is available in the 10-lead MSOP package.
The IC's operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10µA make the LTC1871 ideally suited for battery-operated systems.
For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/ SYNC pin. Higher output voltage boost, SEPIC and flyback applications are possible with the LTC1871 by connecting the SENSE pin to a resistor in the source of the power MOSFET.
The LTC1871 is available in the 10-lead MSOP package.
LTC1871 Maximum Ratings
VIN Voltage ............................................... 0.3V to 36V
INTVCC Voltage ........................................... 0.3V to 7V
INTVCC Output Current ........................................ 50mA
GATE Voltage ........................... 0.3V to VINTVCC + 0.3V
ITH, FB Voltages ....................................... 0.3V to 2.7V
RUN, MODE/SYNC Voltages ....................... 0.3V to 7V
FREQ Voltage ............................................ 0.3V to 1.5V
SENSE Pin Voltage ................................... 0.3V to 36V
Operating Temperature Range (Note 2) .40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range .................65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
INTVCC Voltage ........................................... 0.3V to 7V
INTVCC Output Current ........................................ 50mA
GATE Voltage ........................... 0.3V to VINTVCC + 0.3V
ITH, FB Voltages ....................................... 0.3V to 2.7V
RUN, MODE/SYNC Voltages ....................... 0.3V to 7V
FREQ Voltage ............................................ 0.3V to 1.5V
SENSE Pin Voltage ................................... 0.3V to 36V
Operating Temperature Range (Note 2) .40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range .................65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
LTC1871 Features
High Efficiency (No Sense Resistor Required)
Wide Input Voltage Range: 2.5V to 36V
Current Mode Control Provides Excellent
Transient Response
High Maximum Duty Cycle (92% Typ)
±2% RUN Pin Threshold with 100mV Hysteresis
±1% Internal Voltage Reference
Micropower Shutdown: IQ = 10µA
Programmable Operating Frequency
(50kHz to 1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3 * fOSC
User-Controlled Pulse Skip or Burst Mode®Operation
Internal 5.2V Low Dropout Voltage Regulator
Output Overvoltage Protection
Capable of Operating with a Sense Resistor for High
Output Voltage Applications
Small 10-Lead MSOP Package
Wide Input Voltage Range: 2.5V to 36V
Current Mode Control Provides Excellent
Transient Response
High Maximum Duty Cycle (92% Typ)
±2% RUN Pin Threshold with 100mV Hysteresis
±1% Internal Voltage Reference
Micropower Shutdown: IQ = 10µA
Programmable Operating Frequency
(50kHz to 1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3 * fOSC
User-Controlled Pulse Skip or Burst Mode®Operation
Internal 5.2V Low Dropout Voltage Regulator
Output Overvoltage Protection
Capable of Operating with a Sense Resistor for High
Output Voltage Applications
Small 10-Lead MSOP Package
LTC1871 Typical Application
Telecom Power Supplies
Portable Electronic Equipment
Portable Electronic Equipment
LTC1871 Connection Diagram
LTC1871-7 General Description
The LTC®1871-7 is a current mode, boost, flyback and SEPIC controller optimized for driving 6V-rated MOSFETs in high voltage applications. The LTC1871-7 works equally well in low or high power applications and requires few components to provide a complete power supply solution. The switching frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 6V and a low shutdown quiescent current of 10A make the LTC1871-7 well suited for battery-operated systems. For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/SYNC pin. The LTC1871-7 is available in the 10-lead MSOP package.
LTC1871-7 Maximum Ratings
VIN Voltage ................................................... 0.3V to 36V
INTVCC Voltage .............................................. 0.3V to 9V
INTVCC Output Current .............................................. 50mA
GATE Voltage ............................... 0.3V to VINTVCC + 0.3V
ITH, FB Voltages .......................................... 0.3V to 2.7V
RUN Voltage ................................................... 0.3V to 7V
MODE/SYNC Voltage .........................................0.3V to 9V
FREQ Voltage .................................................0.3V to 1.5V
SENSE Pin Voltage ......................................... 0.3V to 36V
Operating Temperature Range (Note 2) .. 40°C to 85°C
Junction Temperature (Note 3) ................................ 125°C
Storage Temperature Range ................. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................... 300°C
LTC1871-7 Features
` Optimized for High Input Voltage Applications
` Wide Chip Supply Voltage Range: 6V to 36V
` Internal 7V Low Dropout Voltage Regulator Optimized for 6V-Rated MOSFETs
` Current Mode Control Provides Excellent Transient Response
` High Maximum Duty Cycle (92% Typ)
` ±2% RUN Pin Threshold with 100mV Hysteresis
` ±1% Internal Voltage Reference
` Micropower Shutdown: IQ = 10A
` Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
` Synchronizable to an External Clock Up to 1.3 ´ fOSC
` User-Controlled Pulse Skip or Burst Mode® Operation
` Output Overvoltage Protection
` Can be Used in a No RSENSETM Mode for VDS < 36V
` Small 10-Lead MSOP Package
LTC1871-7 Typical Application
· Telecom Power Supplies
· 42V Automotive Systems
· 24V Industrial Controls
· IP Phone Power Supplies
LTC1871-7 Connection Diagram
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