參數(shù)資料
型號(hào)： LT1304CS8-5
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown
中文描述： 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 9/16頁(yè)
文件大?。?/td> 345K
代理商： LT1304CS8-5
9
LT1304/LT1304-3.3/LT1304-5
OPERATIOU
V
2V/DIV
V
200mV/DIV
1304 F08
LOAD CURRENT (mA)
H
1
100
200
1304 F10
10
1000
100
10
1
Figure 10. Battery Life vs Load Current. Dots Specify
Actual Measurements
LOAD CURRENT (mA)
1
W
6
5
4
3
2
1
0
10
100
1304 F11
200
Figure 11. Output Watt Hours vs Load Current. Note
Rapid Fall-Off at Higher Discharge Rates
Figure 8. Low-Battery Detector Transfer Function.
Pull-Up R = 22k, V
IN
= 2V, Sweep Frequency = 10Hz
V
IN
SW
GND
I
LIM
SENSE
SHDN
LB0
LB1
LT1304-5
C2
100
μ
F
C1
100
μ
F
B1
2 CELLS
L1
22
μ
H
D1
V
OUT
5V
200mA
B1 = 2
×
EVEREADY INDUSTRIAL
ALKALINE AA CELLS #EN91
C1, C2 = AVX TPSD107M010R0100
D1 = MOTOROLA MBRS130L
L1 = SUMIDA CD54-220
1304 F09
+
+
Figure 9. 2-Cell to 5V Converter Used in Battery Life Study
Battery Life
How may hours does it work This is the bottom line
question that must be asked of any efficiency study. AA
alkaline cells are not perfect power sources. For efficient
power transfer, energy must be taken from AA cells at a
rate that does not induce excessive loss. AA cells internal
impedance, about 0.2
fresh and 0.5
end-of-life, results
in significant efficiency loss at high discharge rates. Figure
10 illustrates battery life vs load current of Figure 9’s
LT1304, 2-cell to 5V DC/DC converter. Note the acceler-
ated decrease in hours at higher power levels. Figure 11
plots total watt hours vs load current. Watt hours are
determined by the following formula:
WH = I
LOAD
(5V)(H)
Figure 11’s graph varies significantly from electrical effi-
ciency plot pictured on the first page of this data sheet.
Why As more current is drawn from the battery, voltage
drop across the cells’ internal impedance increases. This
causes internal power loss (heating), reducing cell termi-
nal voltage. Since the regulator input acts as a negative
resistance, more current is drawn from the battery as the
terminal voltage decreases. This positive feedback action
compounds the problem.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1304CS8-5#PBF 功能描述:IC REG BOOST 5V 0.2A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)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
LT1304CS8-5#TR 功能描述:IC REG BOOST 5V 0.2A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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
LT1304CS8-5#TRPBF 功能描述:IC REG BOOST 5V 0.2A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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
LT1304CS8PBF 制造商:Linear Technology 功能描述:DC-DC Adj. Micropower Low-Battery SOIC8
LT1305 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower High Power DC/DC Converter with Low-Battery Detector
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