Datasheet LT8610 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current |
| Pages / Page | 22 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.4V to 42V. Ultralow … |
| File Format / Size | PDF / 308 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.4V to 42V. Ultralow Quiescent Current Burst Mode® Operation:
Model Line for this Datasheet
Text Version of Document
LT8610 42V, 2.5A Synchronous Step-Down Regulator with 2.5µA Quiescent Current
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 3.4V to 42V
The LT®8610 is a compact, high efficiency, high speed n
Ultralow Quiescent Current Burst Mode® Operation:
synchronous monolithic step-down switching regulator
2.5μA IQ Regulating 12VIN to 3.3VOUT
that consumes only 2.5µA of quiescent current. Top and
Output Ripple < 10mVP-P
bottom power switches are included with all necessary n
High Efficiency Synchronous Operation:
circuitry to minimize the need for external components.
96% Efficiency at 1A, 5VOUT from 12VIN
Low ripple Burst Mode operation enables high efficiency
94% Efficiency at 1A, 3.3VOUT from 12VIN
down to very low output currents while keeping the output n
Fast Minimum Switch-On Time: 50ns
ripple below 10mVP-P. A SYNC pin allows synchronization n
Low Dropout Under All Conditions: 200mV at 1A
to an external clock. Internal compensation with peak cur- n
Allows Use Of Small Inductors
rent mode topology allows the use of small inductors and n Low EMI results in fast transient response and good loop stability. n Adjustable and Synchronizable: 200kHz to 2.2MHz The EN/UV pin has an accurate 1V threshold and can be n Current Mode Operation used to program VIN undervoltage lockout or to shut down n Accurate 1V Enable Pin Threshold the LT8610 reducing the input supply current to 1µA. A n Internal Compensation capacitor on the TR/SS pin programs the output voltage n Output Soft-Start and Tracking ramp rate during start-up. The PG flag signals when VOUT n Small Thermally Enhanced 16-Lead MSOP Package is within ±9% of the programmed output voltage as well as fault conditions. The LT8610 is available in a small
APPLICATIONS
16-lead MSOP package with exposed pad for low thermal n resistance. Automotive and Industrial Supplies n General Purpose Step-Down L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n GSM Power Supplies owners.
TYPICAL APPLICATION 5V 2.5A Step-Down Converter 12VIN to 5VOUT Efficiency
100 VIN VIN BST 5.5V TO 42V 95 0.1µF 4.7µF EN/UV 4.7µH V 90 OUT PG SW 5V 85 LT8610 2.5A SYNC BIAS 47µF 80 10nF 1M 75 TR/SS FB 1µF 10pF 70 EFFICIENCY (%) INTVCC 65 RT PGND GND 60 fSW = 700kHz 60.4k 243k 55 VIN = 12V VIN = 24V 50 fSW = 700kHz 0 0.5 1 1.5 2 2.5 8610 TA01a LOAD CURRENT (A) 8610 G01 8610fa For more information www.linear.com/LT8610 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 Typical Application Related Parts
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 3.4V to 42V
The LT®8610 is a compact, high efficiency, high speed n
Ultralow Quiescent Current Burst Mode® Operation:
synchronous monolithic step-down switching regulator
2.5μA IQ Regulating 12VIN to 3.3VOUT
that consumes only 2.5µA of quiescent current. Top and
Output Ripple < 10mVP-P
bottom power switches are included with all necessary n
High Efficiency Synchronous Operation:
circuitry to minimize the need for external components.
96% Efficiency at 1A, 5VOUT from 12VIN
Low ripple Burst Mode operation enables high efficiency
94% Efficiency at 1A, 3.3VOUT from 12VIN
down to very low output currents while keeping the output n
Fast Minimum Switch-On Time: 50ns
ripple below 10mVP-P. A SYNC pin allows synchronization n
Low Dropout Under All Conditions: 200mV at 1A
to an external clock. Internal compensation with peak cur- n
Allows Use Of Small Inductors
rent mode topology allows the use of small inductors and n Low EMI results in fast transient response and good loop stability. n Adjustable and Synchronizable: 200kHz to 2.2MHz The EN/UV pin has an accurate 1V threshold and can be n Current Mode Operation used to program VIN undervoltage lockout or to shut down n Accurate 1V Enable Pin Threshold the LT8610 reducing the input supply current to 1µA. A n Internal Compensation capacitor on the TR/SS pin programs the output voltage n Output Soft-Start and Tracking ramp rate during start-up. The PG flag signals when VOUT n Small Thermally Enhanced 16-Lead MSOP Package is within ±9% of the programmed output voltage as well as fault conditions. The LT8610 is available in a small
APPLICATIONS
16-lead MSOP package with exposed pad for low thermal n resistance. Automotive and Industrial Supplies n General Purpose Step-Down L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n GSM Power Supplies owners.
TYPICAL APPLICATION 5V 2.5A Step-Down Converter 12VIN to 5VOUT Efficiency
100 VIN VIN BST 5.5V TO 42V 95 0.1µF 4.7µF EN/UV 4.7µH V 90 OUT PG SW 5V 85 LT8610 2.5A SYNC BIAS 47µF 80 10nF 1M 75 TR/SS FB 1µF 10pF 70 EFFICIENCY (%) INTVCC 65 RT PGND GND 60 fSW = 700kHz 60.4k 243k 55 VIN = 12V VIN = 24V 50 fSW = 700kHz 0 0.5 1 1.5 2 2.5 8610 TA01a LOAD CURRENT (A) 8610 G01 8610fa For more information www.linear.com/LT8610 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 Typical Application Related Parts
