LT8619/LT8619-5
60V, 1.2A Synchronous Monolithic Buck
Regulator with 6µA Quiescent Current
FEATURES
DESCRIPTION
The LT®8619 is a compact, high efficiency, high speed
n
Wide Input Voltage Range: 3V to 60V
Fast Minimum Switch-On Time: 30ns
n
n
synchronous monolithic step-down switching regulator
that consumes only 6μA of quiescent current. The LT8619
can deliver 1.2A of continuous current. Top and bottom
power switches are included with all necessary circuitry
to minimize the need for external components. Low ripple
Burst Mode® operation enables high efficiency down to
very low output currents while keeping the output ripple
Ultralow Quiescent Current Burst Mode Operation:
n
6μA I Regulating 12V to 3.3V
Q
IN
OUT
n
10mV Output Ripple at No Load
P-P
n
n
Synchronizable/Programmable Fixed Frequency
Forced Continuous Mode Operation: 300kHz
to 2.2MHz
to 10mV . A SYNC pin allows forced continuous mode
High Efficiency Synchronous Operation:
P-P
n
operation synchronized to an external clock. Internal com
-
92% Efficiency at 0.5A, 5V
90% Efficiency at 0.5A, 3.3V
from 12V
OUT
IN
n
pensation with peak current mode topology allows the use
of small inductors and results in fast transient response
and good loop stability. The EN/UV pin has an accurate 1V
from 12V
IN
OUT
n
n
n
n
n
n
Low Dropout: 360mV at 0.5A
Low EMI
threshold and can be used to program V undervoltage
lockout or to shut down the LT8619, reducing the input
supply current to below 0.6μA. The PG flag signals when
Accurate 1V Enable Pin Threshold
IN
Internal Soft-Start and Compensation
Power Good Flag
Small Thermally Enhanced 16-Lead MSOP Package
and 10-Lead (3mm × 3mm) DFN Packages
V
is within 7.5% of the programmed output voltage.
OUT
The LT8619 is available in a small 16-lead MSOP and
10-lead 3mm × 3mm DFN packages with exposed pad
for low thermal resistance.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners.
n
12V Automotive Systems
n
12V and 24V Commercial Vehicles
n
48V Electric and Hybrid Vehicles
Industrial Supplies
n
TYPICAL APPLICATION
5V, 1.2A Step-Down Converter
Efficiency at VOUT = 5V
1ꢀꢀ
9ꢀ
8ꢀ
ꢀꢁ
6ꢀ
ꢀꢁ
ꢀꢁ
ꢀꢁ
ꢀꢁ
1ꢀ
ꢀ
1ꢀ
f
ꢀ ꢁꢂꢂꢃꢄꢅ
ꢀꢁꢂ
ꢏ
ꢐꢋ
6ꢏ ꢁꢉ 6ꢄꢏ
ꢏ
ꢒꢓꢁ
ꢓꢔ
ꢀꢁꢂꢃꢄ ꢅꢆꢇꢈ
ꢉꢊꢋꢌꢍꢎꢏꢉꢐ
ꢐꢋ
ꢌꢇꢌꢅꢊ
ꢄꢇ1ꢅꢊ
ꢀꢁ8619ꢂꢃ
1ꢄꢅꢆ
1
ꢏ
ꢉꢑꢁ
ꢃꢏ
ꢀꢁꢁꢂꢃꢂꢀꢄꢃꢅ
1ꢇꢌꢍ
ꢉꢊꢊ ꢉꢋ
ꢝꢋꢞꢑꢏ
ꢐꢋꢁꢏ
1ꢄꢄꢈ
ꢕꢖ
ꢀꢁ1
ꢕꢖ
ꢒꢐꢍꢓ
ꢉꢑꢁ
ꢗꢗ
1ꢅꢊ
ꢀꢁꢂꢃꢄ ꢅꢁꢆꢆ
ꢀꢁꢀ1
ꢀꢁꢀꢀ1
ꢀꢁꢀꢀꢀ1
ꢟꢁ
ꢓꢙꢋꢗ
ꢖꢋꢘ
ꢀ
ꢀ
ꢀ
ꢀ ꢁ8ꢂ
ꢀ ꢁꢂꢃ
ꢀ 1ꢁꢂ
ꢌꢌꢅꢊ
ꢀꢁ
ꢀꢁ
ꢀꢁ
66ꢇꢃꢈ
8619 ꢁꢍꢄ1ꢎ
f
ꢚ ꢛꢄꢄꢈꢆꢜ
ꢉꢓꢗ
ꢀ ꢁ 1ꢂꢃꢄꢅ ꢆꢄꢀꢇꢈꢉꢂꢉꢂꢊꢋꢈꢂ1
1ꢀ 1ꢀꢀ 1ꢀ 1ꢀꢁ
ꢀꢁꢂꢃ ꢄꢅꢆꢆꢇꢈꢉ ꢊꢋꢂꢌ
ꢀ ꢚ ꢏꢐꢓꢆꢍꢙ ꢐꢆꢀꢕꢂꢌꢄꢌꢄꢒꢠꢂꢄ1
ꢚ ꢁꢘꢡ ꢗꢢꢌꢌꢃꢣꢛꢟ1ꢗꢌꢌ6ꢡꢌꢃꢄ
ꢀꢁꢀꢀ1 ꢀꢁꢀ1 ꢀꢁ1
1
ꢗ
ꢉꢑꢁ
8619 ꢀꢁꢂ1ꢃ
8619f
1
For more information www.linear.com/LT8619