参数资料
型号: LTC1736IG#TRPBF
厂商: Linear Technology
文件页数: 8/28页
文件大小: 0K
描述: IC SW REG STEP-DONW SYNC 24-SSOP
标准包装: 1,800
应用: 转换器,Intel Pentium? II,III
输入电压: 3.5 V ~ 36 V
输出数: 1
输出电压: 0.93 V ~ 2 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-SSOP(0.209",5.30mm 宽)
供应商设备封装: 24-SSOP
包装: 带卷 (TR)
LTC1736
FU CTIO AL DIAGRA
V IN
R4
21 V IN
+
C IN
C OSC
R3
0.8V
UVL
REF
6 PGOOD
C OSC 1
0.17 μ A
4 FCB
INTV CC
OSC
SYNC
C
+
1.2V
FORCE BOT
0.8V
+
F
FC
TOP
BOOST
23
TG
24
D B
C B
V SEC
0.74V
DROP
OUT
DET
BOT
SWITCH
SW
22
+
C SEC
V OSENSE
0.86V
+
OV
S
R
Q
TOP ON
0.55V
+
B
LOGIC
D 1
?
?
47pF
INTV CC
10
V FB
9
SGND
5
VIDV CC
16
R2
10k
R1
V FB
0.8V
1.2 μ A
+
EA
g m =1.3m
SD
RUN
SOFT
START
0.86V
4(V FB )
2.4V
2k
ICMP
I1 – +
+
BURST
DISABLE
FC
A
BUFFERED
45k
+
3mV
45k
I2
+
SD
IREV
V IN
INTV CC
BOT
5.2V
LDO
REG
INTV CC
20
C INTVCC
+
+
V OUT
C OUT
40k
6V
+
OVER-
CURRENT
LATCH-OFF
SLOPE COMP
I TH
30k
30k
4.8V
+
BG
19
VID4 15
VID3 14
VID
DECODER
RUN/SS
2
R C
3 I TH
SENSE + 8
7 SENSE –
EXTV CC 17
PGND
18
VID2 13
VID1 12
VID0 11
C SS
C C
R SENSE
1736 FD
OPERATIO
Main Control Loop
(Refer to Functional Diagram)
new load current. While the top MOSFET is off, the
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 I TH , which is the output of the error
amplifier EA. Pin V OSENSE , described in the Pin Functions,
allows EA to receive an output feedback voltage V FB from
the internal resistive divider. When the load current
increases, it causes a slight decrease in V FB relative to the
0.8V reference, which in turn causes the I TH voltage to
increase until the average inductor current matches the
8
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 C B . This capacitor is normally re-
charged from INTV CC through an external Schottky diode
when the top MOSFET is turned off. As V IN decreases
towards V OUT , 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.
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