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參數(shù)資料
| 型號(hào)： | LT1304 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown |
| 中文描述： | 微功率DC / DC轉(zhuǎn)換與低電池檢測器關(guān)機(jī)活動(dòng) |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 345K |
| 代理商： | LT1304 |
8
LT1304/LT1304-3.3/LT1304-5
OPERATIOU
If the full power capability of the LT1304 is not required,
peak switch current can be limited by connecting a resistor
R
LIM
from the I
LIM
pin to ground. With R
LIM
= 22k, peak
switch current is reduced to approximately 500mA. Smaller
power components can then be used. The graph in Figure
6 shows switch current vs R
LIM
resistor value.
V
10V/DIV
I
IN
500mA/DIV
bypass capacitor is required. If the input supply is close to
the IC, a 1
μ
F ceramic capacitor can be used instead. The
LT1304 switches current in 1A pulses, so a low impedance
supply must be available. If the power source (for example,
a 2 AA cell battery) is within 1 or 2 inches of the IC, the
battery itself provides bulk capacitance and the 1
μ
F ce-
ramic capacitor acts to smooth voltage spikes at switch
turn-on and turn-off. If the power source is far away from
the IC, inductance in the power source leads results in high
impedance at high frequency. A local high capacitance
bypass is then required to restore low impedance at the IC.
Figure 5. Start-Up Response with 1
μ
F/1M
Components
in Figure 2 Added. Input Current Is More Controlled. V
OUT
Reaches 5V in 6ms. Output Drives 20mA Load
Layout/Input Bypassing
The LT1304’s high speed switching mandates careful
attention to PC board layout. Suggested component place-
ment is shown in Figure 7. The input supply must have low
impedance at AC and the input capacitor should be placed
as indicated in the figure. The value of this capacitor
depends on how close the input supply is to the IC. In
situations where the input supply is more than a few
inches away from the IC, a 47
μ
F to 100
μ
F solid tantalum
Figure 6. Peak Switch Current vs R
LIM
Value
R
LIM
(k
)
10
P
1000
900
800
700
600
500
400
100
1000
1304 F06
Low-Battery Detector
The LT1304 contains an independent low-battery detector
that remains active when the device is shut down. This
detector, actually a hysteretic comparator, has an open
collector output that can sink up to 500
μ
A. The compara-
tor also operates below the switcher’s undervoltage lock-
out threshold, operating until V
IN
reaches approximately
1.4V. Figure 8 illustrates the input/output characteristic of
the detector. Hysteresis is clearly evident in the figure.
Figure 7. Suggested Layout for Best Performance. Input
Capacitor Placement as Shown Is Highly Recommended.
Switch Trace (Pin 4) Copper Area Is Minimized
1304 F07
8
7
6
5
4
3
2
1
LT1304
C
OUT
+
SHUTDOWN
V
OUT
V
IN
C
IN
+
GND (BATTERY AND LOAD RETURN)
1ms/DIV
1304 F05
V
2V/DIV
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1304CS8 | Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown |
| LT1304CS8-3.3 | Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown |
| LT1304CS8-5 | Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown |
| LT1306ES8 | Synchronous, Fixed Frequency Step-Up DC/DC Converter |
| LT1306 | Synchronous, Fixed Frequency Step-Up DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1304-3.3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown |
| LT1304-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown |
| LT1304CS8 | 功能描述:IC REG BOOST ADJ 0.2A 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1304CS8#PBF | 功能描述:IC REG BOOST ADJ 0.2A 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:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 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:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LT1304CS8#TR | 功能描述:IC REG BOOST ADJ 0.2A 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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