Datasheet LT8610AC, LT8610AC-1 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 42V, 3.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current |
| Pages / Page | 26 / 1 — FeaTures. DescripTion. LT8610 Feature Set, Plus:. 3V Minimum Input … |
| File Format / Size | PDF / 552 Kb |
| Document Language | English |
FeaTures. DescripTion. LT8610 Feature Set, Plus:. 3V Minimum Input Voltage. 800mV Feedback Voltage. 3.5A Maximum Output Current
Text Version of Document
LT8610AC/LT8610AC-1 42V, 3.5A Synchronous Step-Down Regulator with 2.5µA Quiescent Current
FeaTures DescripTion
n
LT8610 Feature Set, Plus:
The LT®8610AC/LT8610AC-1 is a compact, high efficiency,
3V Minimum Input Voltage
high speed synchronous monolithic step-down switching
800mV Feedback Voltage
regulator that consumes only 2.5µA of quiescent current.
3.5A Maximum Output Current
Compared to the LT8610AB, the LT8610AC/LT8610AC-1
Fast 30ns Minimum Switch-On Time
has a lower feedback voltage of 800mV and a lower mini-
Improved Burst Mode Efficiency
mum VIN of 3V. The LT8610AC/LT8610AC-1 has the same
Improved EMI
additional features of the LT8610AB as compared to the n
Wide Input Voltage Range: 3V to 42V
LT8610: higher maximum output current of 3.5A, faster n minimum on time of 30ns, and higher light load efficiency.
Ultralow Quiescent Current Burst Mode® Operation: 2.5μA IQ Regulating 12VIN to 3.3VOUT
The LT8610AC/LT8610AC-1 has a SYNC pin for syn- n
High Efficiency Synchronous Operation:
chronization to an external clock. A capacitor on the TR/
95% Efficiency at 1A, 5VOUT from 12VIN
SS pin programs the output voltage ramp rate during
93% Efficiency at 1A, 3.3VOUT from 12VIN
startup. The PG flag signals when VOUT is within ±8% of n
Low Dropout Under All Conditions: 200mV at 1A
the programmed output voltage as wel as fault conditions. n
Safely Tolerates Inductor Saturation in Overload
The LT8610AC-1 has internal compensation optimized for n Adjustable and Synchronizable Frequency: high switching frequencies resulting in improved transient LT8610AC: 200kHz to 2.2MHz response compared to the LT8610AC. The LT8610AC-1 LT8610AC-1: 1.5MHz to 2.2MHz also has a feature which will soft-start the part when n Accurate 1.015V Enable Pin Threshold exiting dropout or brownout conditions reducing output n Output Soft-Start and Tracking voltage overshoot. n Small Thermally Enhanced 16-Lead MSOP Package
FEEDBACK OUTPUT MIN ON IMPROVED VOLTAGE MIN VIN CURRENT TIME EMI
LT8610AC 0.80V 3.0V 3.5A 30ns Yes
applicaTions
LT8610AB* 0.97V 3.4V 3.5A 30ns Yes n Automotive and Industrial Supplies LT8610A* 0.97V 3.4V 3.5A 30ns Yes n GSM Power Supplies LT8610* 0.97V 3.4V 2.5A 50ns – *See LT8610A/LT8610AB or LT8610 data sheet. 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.
Typical applicaTion Efficiency at 5VOUT 5V 3.5A Step-Down Converter
100 VIN 90 VIN BST 5.5V TO 42V 0.1µF 4.7µF EN/UV 4.7µH V 80 OUT PG LT8610AC SW 5V 47µF 3.5A 70 SYNC BIAS ×2 10nF 1M 60 TR/SS FB EFFICIENCY (%) 1µF 10pF 50 INTVCC VIN = 12V RT GND 40 VIN = 24V VIN = 36V 60.4k 191k 300.1 1 10 100 1000 f LOAD CURRENT (mA) SW = 700kHz 8610ac1 TA01a 8610ac1 TA01b 8610acfa For more information www.linear.com/LT8610AC 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
LT8610 Feature Set, Plus:
The LT®8610AC/LT8610AC-1 is a compact, high efficiency,
3V Minimum Input Voltage
high speed synchronous monolithic step-down switching
800mV Feedback Voltage
regulator that consumes only 2.5µA of quiescent current.
3.5A Maximum Output Current
Compared to the LT8610AB, the LT8610AC/LT8610AC-1
Fast 30ns Minimum Switch-On Time
has a lower feedback voltage of 800mV and a lower mini-
Improved Burst Mode Efficiency
mum VIN of 3V. The LT8610AC/LT8610AC-1 has the same
Improved EMI
additional features of the LT8610AB as compared to the n
Wide Input Voltage Range: 3V to 42V
LT8610: higher maximum output current of 3.5A, faster n minimum on time of 30ns, and higher light load efficiency.
Ultralow Quiescent Current Burst Mode® Operation: 2.5μA IQ Regulating 12VIN to 3.3VOUT
The LT8610AC/LT8610AC-1 has a SYNC pin for syn- n
High Efficiency Synchronous Operation:
chronization to an external clock. A capacitor on the TR/
95% Efficiency at 1A, 5VOUT from 12VIN
SS pin programs the output voltage ramp rate during
93% Efficiency at 1A, 3.3VOUT from 12VIN
startup. The PG flag signals when VOUT is within ±8% of n
Low Dropout Under All Conditions: 200mV at 1A
the programmed output voltage as wel as fault conditions. n
Safely Tolerates Inductor Saturation in Overload
The LT8610AC-1 has internal compensation optimized for n Adjustable and Synchronizable Frequency: high switching frequencies resulting in improved transient LT8610AC: 200kHz to 2.2MHz response compared to the LT8610AC. The LT8610AC-1 LT8610AC-1: 1.5MHz to 2.2MHz also has a feature which will soft-start the part when n Accurate 1.015V Enable Pin Threshold exiting dropout or brownout conditions reducing output n Output Soft-Start and Tracking voltage overshoot. n Small Thermally Enhanced 16-Lead MSOP Package
FEEDBACK OUTPUT MIN ON IMPROVED VOLTAGE MIN VIN CURRENT TIME EMI
LT8610AC 0.80V 3.0V 3.5A 30ns Yes
applicaTions
LT8610AB* 0.97V 3.4V 3.5A 30ns Yes n Automotive and Industrial Supplies LT8610A* 0.97V 3.4V 3.5A 30ns Yes n GSM Power Supplies LT8610* 0.97V 3.4V 2.5A 50ns – *See LT8610A/LT8610AB or LT8610 data sheet. 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.
Typical applicaTion Efficiency at 5VOUT 5V 3.5A Step-Down Converter
100 VIN 90 VIN BST 5.5V TO 42V 0.1µF 4.7µF EN/UV 4.7µH V 80 OUT PG LT8610AC SW 5V 47µF 3.5A 70 SYNC BIAS ×2 10nF 1M 60 TR/SS FB EFFICIENCY (%) 1µF 10pF 50 INTVCC VIN = 12V RT GND 40 VIN = 24V VIN = 36V 60.4k 191k 300.1 1 10 100 1000 f LOAD CURRENT (mA) SW = 700kHz 8610ac1 TA01a 8610ac1 TA01b 8610acfa For more information www.linear.com/LT8610AC 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
