參數(shù)資料
型號(hào)： LT1375CS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SOP-8
文件頁(yè)數(shù)： 19/28頁(yè)
文件大小： 232K
代理商： LT1375CS8
19
LT1375/LT1376
APPLICATIO
S I
FOR
ATIO
U
W
U
U
LOAD CURRENT (A)
0.001
I
8.0
7.5
7.0
6.5
6.0
5.5
5.0
0.01
0.1
1
1375/76 F09
(A)
(C)
(D)
(A) MINIMUM VOLTAGE
TO START WITH
STANDARD CIRCUIT
(B) MINIMUM VOLTAGE
TO RUN WITH
STANDARD CIRCUIT
(C) MINIMUM VOLTAGE
TO START WITH
PNP
(D) MINIMUM VOLTAGE
TO RUN WITH
PNP
(B)
Figure 9. Minimum Input Voltage
Figure 10. Reducing Minimum Input Voltage
OUTPUT
INPUT
1375/76 F10
C2
0.1
μ
F
C
C
D3
1N914
Q1
2N3905
C1
D1
1N914
L1
BOOST
LT1376-5
V
IN
V
SW
SENSE
V
C
GND
+
+
Compensation section for a discussion of an entirely
different cause of subharmonic switching before assum-
ing that the cause is insufficient slope compensation.
Application Note 19 has more details on the theory of slope
compensation.
There is a sync-supply sequence issue with the LT1375. If
power is supplied to the regulator afterthe external sync
signal is supplied, the regulator may not start. This is
caused by the internal frequency foldback condition that
occurs when the FB pin is below 1V (see block diagram
description in the data sheet). The oscillator tries to run at
100kHz when the FB pin is below 1V, and a high frequency
sync signal will then create an extremely low amplitude
oscillator waveform. This amplitude may be so low that the
switch logic is not triggered to create switching. Under the
normal regulated condition, the oscillator runs at much
higher amplitude with plenty of drive for the switch logic.
Note that for fixed voltage parts, the FB pin is replaced with
a SENSE pin, and the voltage divider resistors are internal.
In that case, the FB pin drops below 1V when the output
voltage is less than 40% of its regulated value.
There are no sequence problems if the power supply for
the sync signal comes from the output of the LT1375. If
this is not the case, and the sync signal could be present
when power is applied to the regulator, a gate should be
used to block sync signals as shown in Figure 11. Any
other technique which prevents sync signals when the
regulator output is low will work just as well. It does not
matter whether the sync signal is forced high or low; the
internal circuitry is edge triggered.
SYNCHRONIZING (Available on LT1375 Only)
The LT1375 has the BIAS pin replaced with a SYNC pin,
which is used to synchronize the internal oscillator to an
external signal. It is directly logic compatible and can be
driven with any signal between 10% and 90% duty cycle.
The synchronizing range is equal to initialoperating fre-
quency up to 900kHz. This means that mnimumpractical
sync frequency is equal to the worst-case highself-
oscillating frequency (560kHz), not the typical operating
frequency of 500kHz. Caution should be used when syn-
chronizing above 700kHz because at higher sync frequen-
cies the amplitude of the internal slope compensation
used to prevent subharmonic switching is reduced. This
type of subharmonic switching only occurs at input volt-
ages less than twice output voltage. Higher inductor
values will tend to eliminate problems. See Frequency
LT1375
SYNC
V
OUT
1375/76 F11
V
IN
FREQUENCY COMPENSATION
Loop frequency compensation of switching regulators
can be a rather complicated problem because the reactive
components used to achieve high efficiency also
Figure 11. Gating the Sync Signal
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1375CS8#PBF 功能描述:IC REG BUCK ADJ 1.5A 8SOIC 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(biāo)準(zhǔn)包裝:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
LT1375CS8#TR 功能描述:IC REG BUCK ADJ 1.5A 8SOIC 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(biāo)準(zhǔn)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
LT1375CS8#TRPBF 功能描述:IC REG BUCK ADJ 1.5A 8SOIC 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(biāo)準(zhǔn)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
LT1375CS8-5 功能描述:IC REG BUCK 5V 1.5A 8SOIC 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(biāo)準(zhǔn)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
LT1375CS8-5#PBF 功能描述:IC REG BUCK 5V 1.5A 8SOIC 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(biāo)準(zhǔn)包裝:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
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