Linear Technology LT8330 Manual

FeaTures
3V to 40V Input Voltage Range
n
Ultralow Quiescent Current and Low Ripple Burst
n
Mode Operation: I = 6µA
®
Q
1A, 60V Power Switch
n
Positive or Negative Output Voltage Programming
n
with a Single Feedback Pin
Fixed 2MHz Switching Frequency
n
Accurate 1.6V EN/UVLO Pin Threshold
n
Internal Compensation and Soft-Start
n
Low Profile (1mm) ThinSOT™ Package
n
Low Profile (0.75mm) 8-Lead (3mm × 2mm) DFN
n
Package
applicaTions
Industrial and Automotive
n
Telecom
n
Medical Diagnostic Equipment
n
Portable Electronics
n
Typical applicaTion
48V Boost Converter
V
IN
12V
4.7µF
V
IN
EN/UVLO
INT
6.8µH
4.7µF
SW
LT8330
1M 4.7pF
FBX
V GND
CC
34.8k
1µF
For more information
Low I
DescripTion
The LT 8330 is a current mode DC/DC converter capable
®
of generating either positive or negative output voltages
using a single feedback pin. It can be configured as a
boost, SEPIC or inverting converter consuming as low as
6µA of quiescent current. Low ripple Burst Mode opera-
tion maintains high efficiency down to very low output
currents while keeping the output ripple below 15mV in
a typical application. The internally compensated current
mode architecture results in stable operation over a wide
range of input and output voltages. Integrated soft-start
and frequency foldback functions are included to control
inductor current during start-up. The 2MHz operation
combined with small package options, enables low cost,
area efficient solutions.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
V
OUT
48V
135mA
www.linear.com/LT8330
Boost/SEPIC/
Q
Inverting Converter
with 1A, 60V Switch
Efficiency and Power Loss
100
90
80
70
60
50
40
30
20
EFFICIENCY
10
POWER LOSS
0
0 40 80 120
LOAD CURRENT (mA)
LT8330
1000
900
800
700
600
500
400
300
200
100
0
160
8330 TA01b
8330fa
1