參數(shù)資料
型號(hào)： sp6641
英文描述： 500mA Alkaline DC/DC Boost Regulator in SOT-23(500mA堿性DC/DC升壓穩(wěn)壓器(SOT-23封裝))
中文描述： 堿性500mA的DC / DC升壓穩(wěn)壓器采用SOT - 23（500mA的堿性的DC / DC升壓穩(wěn)壓器（采用SOT - 23封裝））
文件頁(yè)數(shù)： 11/13頁(yè)
文件大?。?/td> 120K
代理商： SP6641
11
Rev. 3/5/02, *Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
Copyright 2002 Sipex Corporation
Low Battery Circuit for SP6641
Application
The circuit in figure 17 uses the Sipex SPX432
shunt regulator as a reference and comparator
circuit to detect a low battery condition and give
a high level, typically 1.7V output. When the
battery is good, the SPX432 output is low, but
not at ground but at 0.8V or about one Vbe
below the 1.24V reference. To translate that
level to a CMOS Low of less than 0.4V, an NPN
and 2 signal diodes can be added to the SPX432
Figure 17. SP6641A 3.3V with Low Battery Detection
APPLICATION INFORMATION: continued
output, as shown. The small SOT23-3pin
SPX432 and 2N3904 bipolar transistor and di-
odes are small and inexpensive to add to the
SP6641 circuit and work well to add a Battery
Low detection circuit, with the addition of about
130
μ
A current from 3.3V out. As a bonus, the
output of this circuit can be used to drive the
SP6641 SHDN_N pin 3 to GND when the bat-
tery is removed, which would reset the SP6641
and eliminate the need for the SuperCap Switch
shown in figure 16.
GND
LX
V
BATT
L1
22
μ
H
100k
U1
SP6641
V
OUT
SHDN
C2
22
μ
F
R3
20k
Diode
Schottky
1
2
3
C1
22
μ
F
5
4
V
BATT
R5
100k
BATT GOOD
D2
D3
1N4148
R2
100k
R1
44k
1N4148
V
OUT
3.3V
Q2
2N3904
2V = BATT GOOD
0V = LOW BATT
R4
1
2
3
REF
K
A
1.8V THRES. VTHRES = 1.24V(1 + R1/R2)
U2
SPX432M
SOT23-3
D1
GND
LX
V
BATT
SHDN
J1
L1
22
μ
H
2.7V, 0.9
PMOS
SOT23-3 IRLML6302
Q1
3
U1
SP6641
V
OUT
SHDN
C2
22
μ
F
V
+3.3V
Diode
Schottky
1
2
3
C1
22
μ
F
5
4
1
2
3
V
BATT
C3
.22F Supercap
3.3V to
Nonvolatile Function
2
1
3
1
2
Q2 SOT23-3 IRLML2402
2.7V NMOS
R1
1M
Figure 16. SP6641A 3.3V with SuperCap Switch
相關(guān)PDF資料
PDF描述
SP6641AEK-33TR Circular Connector; No. of Contacts:3; Series:MS27466; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:9; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:9-98 RoHS Compliant: No
SP6641AEK-50TR 500mA Alkaline DC/DC Boost Regulator in SOT-23
SP6641BEK-50TR MS3120E20-39PXF0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP6641A 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Noise Evaluation Board
SP6641A_05 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:500mA Alkaline DC/DC Boost Regulator in SOT-23
SP6641AEK-3.3 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Low Noise Evaluation Board
SP6641AEK-3.3/TR 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:500mA Alkaline DC/DC Boost Regulator in SOT-23
SP6641AEK-3-3/TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 100mA Alkaline DC/DC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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