Datasheet LT8616 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current |
| Pages / Page | 26 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.4V to 42V. 2.5A and … |
| File Format / Size | PDF / 444 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Wide Input Voltage Range: 3.4V to 42V. 2.5A and 1.5A Buck Regulators with Separate Inputs
Model Line for this Datasheet
Text Version of Document
LT8616 Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5µA Quiescent Current
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 3.4V to 42V
The LT®8616 is a high efficiency, high speed, dual synchro- n
2.5A and 1.5A Buck Regulators with Separate Inputs
nous monolithic step-down switching regulator that con- n
Fast Minimum Switch On-Time: 35ns
sumes only 6.5µA of quiescent current with both channels n
Ultralow Quiescent Current Burst Mode® Operation:
enabled. Both channels contain al switches and necessary n
6.5µA IQ Regulating 12VIN to 5VOUT and 3.3VOUT
circuitry to minimize the need for external components. n
Output Ripple < 15mV
Low ripple Burst Mode operation enables high efficiency n 180° Out of Phase Switching down to very low output currents while minimizing output n Adjustable: 200kHz to 3MHz ripple. A SYNC pin allows synchronization to an external n Synchronizable: 250kHz to 3MHz clock. Internal compensation with peak current mode n Accurate 1V Enable Pin Thresholds topology allows the use of small inductors and results in n Internal Compensation fast transient response and good loop stability. The en- n Output Soft-Start and Tracking able pins have accurate 1V thresholds and can be used to n TSSOP Package: Output Stays at or Below Regulation program undervoltage lockout. Capacitors on the TR/SS Voltage During Adjacent Pin Short or When a Pin Is pins programs the output voltage ramp rate during start- Left Floating up while the PG pins signal when each output is within n Thermally Enhanced 28-Lead TSSOP and 10% of the programmed output voltage. The LT8616 is 3mm × 6mm QFN Packages available in a TSSOP package for high reliability.
APPLICATIONS
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 owners. n Automotive and Industrial Supplies n General Purpose Step-Down
TYPICAL APPLICATION 5V, 3.3V, 700kHz Step-Down Converter Efficiency
V 100 IN VIN1 BOOST1 12V 4.7µF EN/UV1 0.1µF 90 10µH V SW1 OUT1 V V 80 IN1 = VIN2 = 12V IN2 5V, 1.5A 1M fSW = 700kHz 4.7µF EN/UV2 5.6pF 47µF FB1 70 LT8616 187k 60 1M PG1 EFFICIENCY (%) PG2 50 SYNC/MODE BIAS 10nF BOOST2 40 CH1, 5V TR/SS1 0.1µF OUT 1µF CH2, 3.3VOUT TR/SS2 4.7µH V 30 INTV OUT2 CC SW2 0.01 0.1 1 10 100 1000 3.3V, 2.5A 1M 10pF LOAD (mA) 56.2k RT 8616 TA01b GND FB2 316k 2 x 47µF 8616 TA01a 8616fa For more information www.linear.com/LT8616 1
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 3.4V to 42V
The LT®8616 is a high efficiency, high speed, dual synchro- n
2.5A and 1.5A Buck Regulators with Separate Inputs
nous monolithic step-down switching regulator that con- n
Fast Minimum Switch On-Time: 35ns
sumes only 6.5µA of quiescent current with both channels n
Ultralow Quiescent Current Burst Mode® Operation:
enabled. Both channels contain al switches and necessary n
6.5µA IQ Regulating 12VIN to 5VOUT and 3.3VOUT
circuitry to minimize the need for external components. n
Output Ripple < 15mV
Low ripple Burst Mode operation enables high efficiency n 180° Out of Phase Switching down to very low output currents while minimizing output n Adjustable: 200kHz to 3MHz ripple. A SYNC pin allows synchronization to an external n Synchronizable: 250kHz to 3MHz clock. Internal compensation with peak current mode n Accurate 1V Enable Pin Thresholds topology allows the use of small inductors and results in n Internal Compensation fast transient response and good loop stability. The en- n Output Soft-Start and Tracking able pins have accurate 1V thresholds and can be used to n TSSOP Package: Output Stays at or Below Regulation program undervoltage lockout. Capacitors on the TR/SS Voltage During Adjacent Pin Short or When a Pin Is pins programs the output voltage ramp rate during start- Left Floating up while the PG pins signal when each output is within n Thermally Enhanced 28-Lead TSSOP and 10% of the programmed output voltage. The LT8616 is 3mm × 6mm QFN Packages available in a TSSOP package for high reliability.
APPLICATIONS
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 owners. n Automotive and Industrial Supplies n General Purpose Step-Down
TYPICAL APPLICATION 5V, 3.3V, 700kHz Step-Down Converter Efficiency
V 100 IN VIN1 BOOST1 12V 4.7µF EN/UV1 0.1µF 90 10µH V SW1 OUT1 V V 80 IN1 = VIN2 = 12V IN2 5V, 1.5A 1M fSW = 700kHz 4.7µF EN/UV2 5.6pF 47µF FB1 70 LT8616 187k 60 1M PG1 EFFICIENCY (%) PG2 50 SYNC/MODE BIAS 10nF BOOST2 40 CH1, 5V TR/SS1 0.1µF OUT 1µF CH2, 3.3VOUT TR/SS2 4.7µH V 30 INTV OUT2 CC SW2 0.01 0.1 1 10 100 1000 3.3V, 2.5A 1M 10pF LOAD (mA) 56.2k RT 8616 TA01b GND FB2 316k 2 x 47µF 8616 TA01a 8616fa For more information www.linear.com/LT8616 1
