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LT1776CS8 Datasheet(PDF) 16 Page - Linear Technology

Part # LT1776CS8
Description  Wide Input Range, High Efficiency, Step-Down Switching Regulator
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1776CS8 Datasheet(HTML) 16 Page - Linear Technology

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16
LT1776
TYPICAL APPLICATIONS
(a)
C1: PANASONIC HFQ 39
µF AT 63V
C2: AVX D CASE 100
µF 10V
TPSD107M010R0080
C3: 2200pF, X7R
C1
1776 F06a
VIN
10V TO
40V
+
C2
+
D1
R1
36.5k
1%
VOUT
5V
0mA to 400mA
R2
12.1k
1%
R3
22k
5%
L1
68
µH
C3
C4
C5
C4, C5: 100pF, X7R OR COG/NPO
D1: MOTOROLA 100V, 1A, SMD SCHOTTKY
MBRS1100 (T3)
L1: COILCRAFT DO1608C-683
FOR 3.3V VOUT VERSION:
IOUT: 0mA TO 500mA
L1: 47
µH, DO1608C-473
R1: 24.3K, R2: 14.7k
VIN
VCC
VSW
LT1776
FB
VC
SHDN
SYNC
2
5
4
3
7
8
1
6
GND
LOAD CURRENT (mA)
1
60
70
80
90
10
100
1000
1776 F06b
50
40
30
20
VIN = 10V
VIN = 20V
VIN = 30V
VIN = 40V
(b)
Figure 6. Minimum Inductor Size Application
“bang-bang” digital manner, via comparator U2, an
LTC1440. Resistor divider R3/R4 provides a scaled ver-
sion of the output voltage, which is compared against U2’s
internal reference. Intentional hysteresis is set by the R5/
R6 divider. As the output voltage falls below the regulation
range, the LT1776 is turned on. The output voltage rises,
and as it climbs above the regulation range, the LT1776 is
turned off. Efficiency is maximized, as the LT1776 is only
powered up while it is providing heavy output current.
Burst Mode Operation Configuration
Figure 4b demonstrates that power supply efficiency de-
grades with lower output load current. This is not surpris-
ing, as the LT1776 itself represents a fixed power overhead.
A possible way to improve light load efficiency is in Burst
Mode operation.
Figure 7 shows the LT1776 configured for Burst Mode
operation. Output voltage regulation is now provided in a



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