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LTC1735CS 数据表(PDF) 22 Page - Linear Technology

部件名 LTC1735CS
功能描述  High Efficiency Synchronous Step-Down Switching Regulator
PDF  32 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1735CS 数据表(HTML) 22 Page - Linear Technology

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LTC1735
APPLICATIO S I FOR ATIO
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
COSC
RUN/SS
ITH
FCB
SGND
VOSENSE
SENSE–
SENSE+
TG
BOOST
SW
VIN
INTVCC
BG
PGND
EXTVCC
U1
LTC1735
C2
0.1
µF
C8
0.22
µF
C4
100pF
C5
47pF
C3
100pF
R2
100k
R1
27k
R5
0.003
Ω
GND
VOUT
1.5V
15A
VIN
7.5V TO
24V
GND
C6
1000pF
C1
39pF
+
C10
4.7
µF
10V
C9
1
µF
5V (OPTIONAL)
C11
330pF
C19
1
µF
+
C15 TO
C18
180
µF
4V
C7
0.1
µF
M1
FDS6680A
M2, M3
FDS6680A
×2
C9, C19: TAIYO YUDEN JMK107BJ105
C10: KEMET T494A475M010AS
C12 TO C14: TAIYO YUDEN GMK325F106
C15 TO C18: PANASONIC EEFUE0G181R
D1: CENTRAL SEMI CMDSH-3
D2: MOTOROLA MBRS340
L1: PANASONIC ETQP6F1R0SA
M1 TO M3: FAIRCHILD FDS6680A
R5: IRC LRF2512-01-R003-J
U1: LINEAR TECHNOLOGY LTC1735CS
1735 F08
D1
CMDSH-3
R6
10k
R7
11.5k
D2
MBRS340
C12 TO C14
10
µF
35V
L1
1
µH
R4
100k
R3
680k
Figure 8. CPU-Core-Voltage Regulator with Active Voltage Positioning
voltage cannot exceed
±0.082V. At VOUT = 1.5V, the
maximum output voltage change controlled by the ITH pin
would be:
∆=
=
±
=±
V
Input Offset V
V
V
V
mV
OSENSE
OUT
REF
•
.• .
.
003
1 5
08
56
With the optimum resistor values at the ITH pin, the output
voltage will swing from 1.55V at minimum load to 1.44V
at full load. At this output voltage, active voltage position-
ing provides an additional
±56mV to the allowable tran-
sient voltage on the output capacitors, a 68% improve-
ment over the
±82mV allowed without active voltage
positioning.
The next step is to calculate the ITH pin voltage, VITH, scale
factor. The VITH scale factor reflects the ITH pin voltage
required for a given load current. VITH controls the peak
sense resistor voltage, which represents the DC output
current plus one half of the peak-to-peak inductor current.
The no load to full load VITH range is from 0.3V to 2.4V,
which controls the sense resistor voltage from 0V to the
∆VSENSE(MAX) voltage of 75mV. The calculated VITH scale
factor with a 0.003
Ω sense resistor is:
V
Scale Factor
V
Range Sense
sistor Value
V
VV
V
VA
ITH
ITH
SENSE MAX
=
∆
==
•Re
(.
– .
) • .
.
./
()
24
03
0003
0 075
0 084
VITH at any load current is:
VI
I
V
Scale Factor
V
Offset
ITH
OUTDC
L
ITH
ITH
=+ ∆


+
2
•



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