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LTC1736 데이터시트(PDF) 8 Page - Linear Technology

부품명 LTC1736
상세설명  5-Bit Adjustable High Efficiency Synchronous Step-Down Switching Regulator
PDF  28 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC1736 데이터시트(HTML) 8 Page - Linear Technology

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LTC1736
FU CTIO AL DIAGRA
OPERATIO
(Refer to Functional Diagram)
Main Control Loop
The LTC1736 uses a constant frequency, current mode
step-down architecture. During normal operation, the
top MOSFET is turned on each cycle when the oscillator
sets the RS latch, and turned off when the main current
comparator I1 resets the RS latch. The peak inductor
current at which I1 resets the RS latch is controlled by the
voltage on Pin ITH, which is the output of the error
amplifier EA. Pin VOSENSE, described in the Pin Functions,
allows EA to receive an output feedback voltage VFB from
the internal resistive divider. When the load current
increases, it causes a slight decrease in VFB relative to the
0.8V reference, which in turn causes the ITH voltage to
increase until the average inductor current matches the
new load current. While the top MOSFET is off, the
bottom MOSFET is turned on until either the inductor
current starts to reverse, as indicated by current com-
parator I2, or the beginning of the next cycle.
The top MOSFET driver is powered from a floating
bootstrap capacitor CB. This capacitor is normally re-
charged from INTVCC through an external Schottky diode
when the top MOSFET is turned off. As VIN decreases
towards VOUT, the converter will attempt to turn on the
top MOSFET continuously (‘’dropout’’). A dropout counter
detects this condition and forces the top MOSFET to turn
off for about 500ns every tenth cycle to recharge the
bootstrap capacitor.
SW
–
+
+
–
0.86V
0.74V
–
+
0.55V
2.4V
0.8V
47pF
0.86V
I1
+
–
I2
+
–
EA
A
BURST
DISABLE
FC
OV
B
–
+
4.8V
IREV
+
–
+
–
F
FC
S
R
Q
DROP
OUT
DET
0.8V
REF
SWITCH
LOGIC
SD
6V
RUN/SS
CSS
RC
VFB
40k
1.2
µA
RUN
SOFT
START
+
OVER-
CURRENT
LATCH-OFF
SD
ITH
CC
0.17
µA
OSC
4(VFB)
BUFFERED
ITH
SLOPE COMP
+
–
–
+
3mV
ICMP
R2
10k
R1
SGND
VFB
VOSENSE
2k
45k
BOT
TOP ON
FORCE BOT
45k
30k
30k
SENSE+
SENSE–
SYNC
1.2V
0.8V
C
TOP
UVL
BOT
INTVCC
5.2V
LDO
REG
VIN
+
CINTVCC
VOUT
VSEC
INTVCC
BG
PGND
VIN
VIN
BOOST
TG
INTVCC
CB
DB
D1
COSC
+
CIN
+
CSEC
•
•
+
COUT
EXTVCC
FCB
R4
R3
COSC
RSENSE
1736 FD
1
PGOOD
6
9
10
5
VIDVCC
VID4
INTVCC
15
VID3 14
VID2 13
VID1 12
VID0 11
4
21
23
24
22
20
19
18
17
7
8
3
2
VID
DECODER
16
gm =1.3m



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