1
dc2258af
DEMO MANUAL DC2258A
Description
LT3048
Low Noise Bias Generator
Demonstration circuit 2258A features the
LT
®
3048
, a Boost
DC/DC Converter with integrated Schottky diode and LDO in
a 2mm × 2mm DFN package. This demo board is designed
to convert a 2.7V to 4.8V input to a 20V output at 10mA
to 25mA with low output ripple and noise. The LT3048
allows for the output to be programmed up to 23V. The
LT3048 is programmed for 1MHz switching frequency.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
The LT3048 data sheet gives a complete description of
the part, operation, and application information. The data
sheet must be read in conjunction with this Quick Start
Guide for the demo circuit DC2258A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2258A
Specifications are at T
A
= 25°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply Range
2.7
4.8
V
Output Voltage Range
V
IN
= 2.7V, I
OUT
= 10mA
19.5
20
20.5
V
Switching Frequency
0.7
1
1.3
MHz
Output Ripple
V
IN
= 4.8V, Load = 25mA
1
mV
OUTPUT CURRENT (mA)
10
EFFICIENCY (%)
30
90
20
40
50
60
70
80
6
DC2258A F01
28
4
2
8 10
14
12
16 18
22
20
24 26
2.7V
IN
4.8V
IN
Figure 1. Efficiency Curve
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