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參數(shù)資料
| 型號： | LTC1434CGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 14-bit, 5V, 200KSPS, 8-Channel Unipolar ADC 24-SOIC -40 to 85 |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 379K |
| 代理商： | LTC1434CGN |
6
LTC1433/LTC1434
FU
CTIO
AL DIAGRW
U
U
OPERATIO
Main Control Loop
The LTC1433/LTC1434 is a constant frequency, pulse-
width modulated current mode switching regulator. Dur-
ing normal operation, the internal P-channel power MOSFET
is turned on each cycle when the oscillator sets the RS
latch FF3, and turned off when the main current compara-
tor I
COMP
resets the latch. The peak inductor current at
which the I
COMP
resets the RS latch is controlled by the
voltage on the I
TH
pin , which is the output of error amplifier
GM. Pins V
PROG
and V
OSENSE
, described in the Pin Func-
tions section, allow GM to receive an output feedback
voltage V
FB
from either the internal or external resistive
dividers. When the load current increases, it causes a
slight decrease in V
FB
relative to the 1.19V reference,
which in turn causes the I
TH
voltage to increase until the
average inductor current matches the new load current.
U
(Refer to Functional Diagram)
The main control loop is shut down by pulling the RUN/SS
pin low. Releasing RUN/SS allows an internal 3
μ
A current
source to charge up the soft start capacitor C
SS
. When C
SS
reaches 1.3V, the main control loop is enabled with the I
TH
voltage clamped at approximately 30% of its maximum
value. As C
SS
continues to charge, I
TH
is gradually re-
leased allowing normal operation to resume.
Comparator OVDET guards against transient overshoots
> 7.5% by turning off the P-channel power MOSFETs and
keeping them off until the fault is removed.
Low Current Operation
The LTC1433/LTC1434 have two internal P-channel
MOSFETs sized for low and high load current conditions.
At low load current, only the small MOSFET will be turned
on while at high load current both MOSFETs will be on.
–
+
–
+
–
+
–
+
LOBAT
–
+
–
+
–
+
GM
LIDET
OVDET
POR
BSW
PWRV
IN
SSW
I
TH
LBI
LBO
V
REF
PLL LPF
PLLIN
C
OSC
180k
0.6V
SV
IN
30k
6V
V
REF
+ 89mV
V
SET
I
DET
I
COMP
12mV
RUN/SS
50k
120k
REF
AND
V
CC
SHDN
V
REF
(1.19V)
V
REF
PGND
SGND
V
CC
SV
IN
RB
SB
Q
Q
FF3
RB
SB
Q
Q
FF2
D
CK
Q
Q
FF1
POR
PLL
SHDN
SHDN
FREQ
SHIFT
OSC
V
CO
SLOPE
COMP
R
0.143
VOLTAGE
SELECT
60k
240k
60k
V
PROG
V
OSENSE
1433/34 FD
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| LTC1434I | 14-bit, 5V, 200KSPS, 8-Channel Unipolar ADC 24-SOIC -40 to 85 |
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| LTC1434CGN#PBF | 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LTC1434CGN#TR | 功能描述:IC REG BUCK 3.3V/5V/ADJ 20SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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