Datasheet LTC3863 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 60V Low IQ Inverting DC/DC Controller |
| Páginas / Página | 38 / 1 — FEATURES. DESCRIPTION. Wide Operating VIN Range: 3.5V to 60V. Wide … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 1.5 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Wide Operating VIN Range: 3.5V to 60V. Wide Negative VOUT Range: –0.4V to Beyond –150V
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LTC3863 60V Low IQ Inverting DC/DC Controller
FEATURES DESCRIPTION
n
Wide Operating VIN Range: 3.5V to 60V
The LTC®3863 is a robust, inverting DC/DC PMOS control- n
Wide Negative VOUT Range: –0.4V to Beyond –150V
ler optimized for automotive and industrial applications. It n
Low Operating IQ = 70µA
drives a P-channel power MOSFET to generate a negative n
Strong High Voltage MOSFET Gate Driver
output and requires just a single inductor to complete the n
Constant Frequency Current Mode Architecture
circuit. Output voltages from –0.4V to –150V are typically n
Verified FMEA for Adjacent Pin Open/Short
achievable with higher voltages possible, only limited by n Selectable High Efficiency Burst Mode® Operation or external components. Pulse-Skipping Mode at Light Loads n Programmable Fixed Frequency: 50kHz to 850kHz The LTC3863 offers excellent light load efficiency, draw- n Phase-Lockable Frequency: 75kHz to 750kHz ing only 70μA quiescent current in a user programmable n Accurate Current Limit Burst Mode operation. Its peak current mode, constant n Programmable Soft-Start or Voltage Tracking frequency PWM architecture provides for good control of n Internal Soft-Start Guarantees Smooth Start-Up switching frequency and output current limit. The switch- n Low Shutdown IQ = 7µA ing frequency can be programmed from 50kHz to 850kHz n Available in Small 12-Lead Thermally Enhanced with an external resistor and can be synchronized to an MSOP and DFN Packages external clock from 75kHz to 750kHz. The LTC3863 offers programmable soft-start or output
APPLICATIONS
tracking. Safety features include overvoltage, overcurrent and short-circuit protection including frequency foldback. n Industrial and Automotive Power Supplies n The LTC3863 is available in thermally enhanced 12-lead Telecom Power Supplies n MSOP and 3mm Distributed Power Systems × 4mm DFN packages. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5731694.
TYPICAL APPLICATION 4.5V to 16V Input, –5V/1.7A Output, 350kHz Inverting Converter Efficiency
VIN + 90 9 4.5V TO 16V 0.47µF 10µF VIN = 12V 25V 100µF 80 VOUT = –5V 8 CAP ×2 20V RUN V 350kHz IN 70 7 16mΩ POWER LOSS (W) PLLIN/MODE 60 EFFICIENCY 6 SS SENSE 50 5 27nF GATE Si7129 14.7k VOUT 40 4 ITH PULSE-SKIPPING MODE LTC3863 –5V Burst Mode OPERATION 61.9k 33µF 150µF 1.7A EFFICIENCY (%) 30 3 B540C FREQ 16V 10µH ×2 + 511k ×2 20 2 SGND 10 POWER LOSS 1 VFBN 80.6k 68pF 0 0 PGND 3863 TA01a VFB 0.002 0.02 0.2 2 LOAD CURRENT (A) 3863 TA01b Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Wide Operating VIN Range: 3.5V to 60V
The LTC®3863 is a robust, inverting DC/DC PMOS control- n
Wide Negative VOUT Range: –0.4V to Beyond –150V
ler optimized for automotive and industrial applications. It n
Low Operating IQ = 70µA
drives a P-channel power MOSFET to generate a negative n
Strong High Voltage MOSFET Gate Driver
output and requires just a single inductor to complete the n
Constant Frequency Current Mode Architecture
circuit. Output voltages from –0.4V to –150V are typically n
Verified FMEA for Adjacent Pin Open/Short
achievable with higher voltages possible, only limited by n Selectable High Efficiency Burst Mode® Operation or external components. Pulse-Skipping Mode at Light Loads n Programmable Fixed Frequency: 50kHz to 850kHz The LTC3863 offers excellent light load efficiency, draw- n Phase-Lockable Frequency: 75kHz to 750kHz ing only 70μA quiescent current in a user programmable n Accurate Current Limit Burst Mode operation. Its peak current mode, constant n Programmable Soft-Start or Voltage Tracking frequency PWM architecture provides for good control of n Internal Soft-Start Guarantees Smooth Start-Up switching frequency and output current limit. The switch- n Low Shutdown IQ = 7µA ing frequency can be programmed from 50kHz to 850kHz n Available in Small 12-Lead Thermally Enhanced with an external resistor and can be synchronized to an MSOP and DFN Packages external clock from 75kHz to 750kHz. The LTC3863 offers programmable soft-start or output
APPLICATIONS
tracking. Safety features include overvoltage, overcurrent and short-circuit protection including frequency foldback. n Industrial and Automotive Power Supplies n The LTC3863 is available in thermally enhanced 12-lead Telecom Power Supplies n MSOP and 3mm Distributed Power Systems × 4mm DFN packages. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5731694.
TYPICAL APPLICATION 4.5V to 16V Input, –5V/1.7A Output, 350kHz Inverting Converter Efficiency
VIN + 90 9 4.5V TO 16V 0.47µF 10µF VIN = 12V 25V 100µF 80 VOUT = –5V 8 CAP ×2 20V RUN V 350kHz IN 70 7 16mΩ POWER LOSS (W) PLLIN/MODE 60 EFFICIENCY 6 SS SENSE 50 5 27nF GATE Si7129 14.7k VOUT 40 4 ITH PULSE-SKIPPING MODE LTC3863 –5V Burst Mode OPERATION 61.9k 33µF 150µF 1.7A EFFICIENCY (%) 30 3 B540C FREQ 16V 10µH ×2 + 511k ×2 20 2 SGND 10 POWER LOSS 1 VFBN 80.6k 68pF 0 0 PGND 3863 TA01a VFB 0.002 0.02 0.2 2 LOAD CURRENT (A) 3863 TA01b Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts