Datasheet LT8619, LT8619-5 (Analog Devices)

LT8619/LT8619-5 60V, 1.2A Synchronous Monolithic Buck Regulator with 6µA Quiescent Current
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 3V to 60V
The LT®8619 is a compact, high efficiency, high speed n
Fast Minimum Switch-On Time: 30ns
synchronous monolithic step-down switching regulator n
Ultralow Quiescent Current Burst Mode Operation:
that consumes only 6μA of quiescent current. The LT8619 n
6μA I
can deliver 1.2A of continuous current. Top and bottom
Q Regulating 12VIN to 3.3VOUT
n
10mV
power switches are included with all necessary circuitry
P-P Output Ripple at No Load
n
Synchronizable/Programmable Fixed Frequency
to minimize the need for external components. Low ripple
Forced Continuous Mode Operation: 300kHz
Burst Mode® operation enables high efficiency down to
to 2.2MHz
very low output currents while keeping the output ripple n
High Efficiency Synchronous Operation:
to 10mVP-P. A SYNC pin allows forced continuous mode n
92% Efficiency at 0.5A, 5V
operation synchronized to an external clock. Internal com-
OUT from 12VIN
n
90% Efficiency at 0.5A, 3.3V
pensation with peak current mode topology allows the use
OUT from 12VIN
n
Low Dropout: 360mV at 0.5A
of small inductors and results in fast transient response n
Low EMI
and good loop stability. The EN/UV pin has an accurate 1V n Accurate 1V Enable Pin Threshold threshold and can be used to program VIN undervoltage n Internal Soft-Start and Compensation lockout or to shut down the LT8619, reducing the input n Power Good Flag supply current to below 0.6μA. The PG flag signals when n Small Thermally Enhanced 16-Lead MSOP Package VOUT is within ±7.5% of the programmed output voltage. and 10-Lead (3mm × 3mm) DFN Packages The LT8619 is available in a small 16-lead MSOP and 10-lead 3mm × 3mm DFN packages with exposed pad
APPLICATIONS
for low thermal resistance. n 12V Automotive Systems All registered trademarks and trademarks are the property of their respective owners. n 12V and 24V Commercial Vehicles n 48V Electric and Hybrid Vehicles n Industrial Supplies
TYPICAL APPLICATION 5V, 1.2A Step-Down Converter Efficiency at V Efficiency at VOUT OUT = 5V = 5V
100 10 V OSC f = 700kHz IN VIN BST 90 Burst Mode 6V TO 60V 2.2µF 0.1µF OPERATION LT8619-5 10µH 80 1 VOUT SW 5V 70 EFFICIENCY POWER LOSS (W) OFF ON 1.2A EN/UV 100k 60 0.1 INTVCC PG PG 50 1µF BIAS 40 POWER LOSS 0.01 EFFICIENCY (%) RT OUT 30 SYNC GND 22µF V = 48V 66.5k IN 8619 TA01a 20 V = 24V 0.001 IN V = 12V f 10 IN OSC = 700kHz L = 10µH, IHLP-2020BZ-01 0 0.0001 L = VISHAY IHLP-2020BZ-01 0.001 0.01 0.1 1 10 100 1k 10k COUT = TDK C3225X7R1C226K250 LOAD CURRENT (mA) 8619 TA01b Rev A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Revision History Typical Application Related Parts