Datasheet LT8630 (Analog Devices)

LT8630 100V, 0.6A Synchronous Micropower Step-Down High Efficiency Switching Regulator
FeaTures DescripTion
n
Ultrawide Input Voltage Range: 3V to 100V
The LT®8630 is a current mode PWM step-down DC/DC n
Boundary Mode Switching for Highest Efficiency
converter with internal synchronous switches that provide n
Output Voltage Range: 0.8V to 60V
current for output loads up to 0.6A. The wide input range n
Internal Synchronous Switches
of 3V to 100V makes the LT8630 suitable for regulating n
Burst Mode® Operation:
power from a wide variety of sources, including automotive
16µA IQ at 12VIN to 5VOUT
and industrial systems and 36V to 72V telecom supplies.
7µA IQ at 48VIN to 5VOUT
Variable frequency boundary mode switching maximizes n
Low Dropout: 99% Maximum Duty Cycle
efficiency across a wide range of input voltages. Low ripple n
Peak Current Mode Control
Burst Mode operation enables high efficiency operation n
Programmable Undervoltage Lockout
down to very low output currents while keeping the output n
Power Good Flag
ripple below 5mV. The soft-start feature controls the ramp n Flexible Output Voltage Tracking rate of the output voltage, eliminating input current surge n Short-Circuit Protection during start-up, while also providing output tracking. A n Low Shutdown Current: 5µA power good flag signals when the output voltage is within n Tolerates Pin Open/Short Faults ±7.5% of the regulated output. Undervoltage lockout can n Thermally Enhanced 20-Lead TSSOP with High be programmed using the EN/UV pin. Shutdown mode Voltage Lead Spacing reduces the total quiescent current to < 5µA. The LT8630 is available in a 20-lead TSSOP package with exposed pad
applicaTions
for low thermal resistance and high voltage lead spacing. L n , LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks Automotive Supplies of Linear Technology Corporation. All other trademarks are the property of their respective n owners. Telecom Supplies n Distributed Supply Regulation
Typical applicaTion 12V, 0.6A Step-Down Converter Efficiency at VOUT = 12V
100 VIN VIN 13V TO 100V BST LT8630 2.2µF 0.1µF 22µH 90 EN/UV SW 80 PG 70 IND VOUT 60 INTV V 12V CC OUT 2.2µF 0.6A 50 10pF 1M EFFICIENCY (%) RT FB 40 VIN = 24V VIN = 48V 71.5k 8.66k 30 TR/SS VIN = 72V VIN = 100V GND 47µF 20 0 100 200 300 400 500 600 700 800 0.1µF LOAD CURRENT (mA) 8630 TA01b 8630 TA01a 8630f For more information www.linear.com/LT8630 1 Document Outline Features Description Applications 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