Datasheet LT3990, LT3990-3.3, LT3990-5 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 62V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes |
| Pages / Page | 22 / 1 — FEATURES. DESCRIPTION. Low Ripple Burst Mode® Operation. 2.5µA. IQ at … |
| File Format / Size | PDF / 307 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Low Ripple Burst Mode® Operation. 2.5µA. IQ at 12VIN to 3.3VOUT. Output Ripple < 5mVP-P
Model Line for this Datasheet
- LT3990EDD#PBF LT3990EDD#TRPBF LT3990EMSE#PBF LT3990EMSE#TRPBF LT3990EMSE-3.3#PBF LT3990EMSE-3.3#TRPBF LT3990EMSE-5#PBF LT3990EMSE-5#TRPBF LT3990EMSE-5#WTRPBF LT3990HMSE#PBF LT3990HMSE#TRPBF LT3990HMSE-3.3#PBF LT3990HMSE-3.3#TRPBF LT3990HMSE-5#PBF LT3990HMSE-5#TRPBF LT3990IDD#PBF LT3990IDD#TRPBF LT3990IMSE#PBF LT3990IMSE#TRPBF LT3990IMSE-3.3#PBF LT3990IMSE-3.3#TRPBF LT3990IMSE-5#PBF LT3990IMSE-5#TRPBF
Text Version of Document
LT3990/LT3990-3.3/LT3990-5 62V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes
FEATURES DESCRIPTION
n
Low Ripple Burst Mode® Operation
The LT®3990 is an adjustable frequency monolithic buck
2.5µA IQ at 12VIN to 3.3VOUT
switching regulator that accepts a wide input voltage
Output Ripple < 5mVP-P
range up to 62V, and consumes only 2.5µA of quiescent n
Wide Input Voltage Range: 4.2V to 62V Operating
current. A high efficiency switch is included on the die n
Adjustable Switching Frequency: 200kHz to 2.2MHz
along with the catch diode, boost diode, and the neces- n
Integrated Boost and Catch Diodes
sary oscillator, control and logic circuitry. Low ripple Burst n
350mA Output Current
Mode operation maintains high efficiency at low output n
Fixed Output Voltages: 3.3V, 5V
currents while keeping the output ripple below 5mV in a
2µA IQ at 12VIN
typical application. Current mode topology is used for fast n Accurate Programmable Undervoltage Lockout transient response and good loop stability. A catch diode n FMEA Fault Tolerant (MSOP Package) current limit provides protection against shorted outputs Output Stays at or Below Regulation Voltage During and overvoltage conditions. An accurate programmable Adjacent Pin Short or When a Pin is Left Floating undervoltage lockout feature is available, producing a low n Low Shutdown Current: IQ = 0.7µA shutdown current of 0.7µA. A power good flag signals when n Internal Sense Limits Catch Diode Current VOUT reaches 90% of the programmed output voltage. The n Power Good Flag LT3990 is available in small, thermally enhanced 16-pin n Small, Thermally Enhanced 16-Pin MSOP MSOP and 3mm × 3mm DFN packages. and (3mm × 3mm) DFN Packages L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
APPLICATIONS
of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Automotive Battery Regulation n Power for Portable Products n Industrial Supplies
TYPICAL APPLICATION Power Loss
1000
5V Step-Down Converter
VIN = 12V 100 VIN 6.5V TO 62V 0.22µF VIN BOOST 10 LT3990-5 33µH VOUT OFF ON EN/UVLO SW 5V 1 PG 350mA BD POWER LOSS (mW) 2.2µF RT VOUT 22µF 0.1 GND 374k 0.01 f = 400kHz 3990 TA01a 0.001 0.01 0.1 1 10 100 LOAD CURRENT (mA) 3990 TA01b 3990fa 1 Document Outline Features Applications Description 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 Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Low Ripple Burst Mode® Operation
The LT®3990 is an adjustable frequency monolithic buck
2.5µA IQ at 12VIN to 3.3VOUT
switching regulator that accepts a wide input voltage
Output Ripple < 5mVP-P
range up to 62V, and consumes only 2.5µA of quiescent n
Wide Input Voltage Range: 4.2V to 62V Operating
current. A high efficiency switch is included on the die n
Adjustable Switching Frequency: 200kHz to 2.2MHz
along with the catch diode, boost diode, and the neces- n
Integrated Boost and Catch Diodes
sary oscillator, control and logic circuitry. Low ripple Burst n
350mA Output Current
Mode operation maintains high efficiency at low output n
Fixed Output Voltages: 3.3V, 5V
currents while keeping the output ripple below 5mV in a
2µA IQ at 12VIN
typical application. Current mode topology is used for fast n Accurate Programmable Undervoltage Lockout transient response and good loop stability. A catch diode n FMEA Fault Tolerant (MSOP Package) current limit provides protection against shorted outputs Output Stays at or Below Regulation Voltage During and overvoltage conditions. An accurate programmable Adjacent Pin Short or When a Pin is Left Floating undervoltage lockout feature is available, producing a low n Low Shutdown Current: IQ = 0.7µA shutdown current of 0.7µA. A power good flag signals when n Internal Sense Limits Catch Diode Current VOUT reaches 90% of the programmed output voltage. The n Power Good Flag LT3990 is available in small, thermally enhanced 16-pin n Small, Thermally Enhanced 16-Pin MSOP MSOP and 3mm × 3mm DFN packages. and (3mm × 3mm) DFN Packages L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
APPLICATIONS
of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Automotive Battery Regulation n Power for Portable Products n Industrial Supplies
TYPICAL APPLICATION Power Loss
1000
5V Step-Down Converter
VIN = 12V 100 VIN 6.5V TO 62V 0.22µF VIN BOOST 10 LT3990-5 33µH VOUT OFF ON EN/UVLO SW 5V 1 PG 350mA BD POWER LOSS (mW) 2.2µF RT VOUT 22µF 0.1 GND 374k 0.01 f = 400kHz 3990 TA01a 0.001 0.01 0.1 1 10 100 LOAD CURRENT (mA) 3990 TA01b 3990fa 1 Document Outline Features Applications Description 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 Revision History Typical Application Related Parts
