參數(shù)資料
型號(hào)： LT1511CSW
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Octal Bus Transceivers 20-SOIC 0 to 70
中文描述： 4 A BATTERY CHARGE CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO24
封裝： 0.300 INCH, PLASTIC, SOP-24
文件頁(yè)數(shù)： 13/16頁(yè)
文件大小： 145K
代理商： LT1511CSW
13
LT1511
APPLICATIO
S I
FOR
ATIO
U
P
3.5mA V
BIAS
IN
2
+
(
[
W
U
U
)
+
Figure 7. Lower V
BOOST
P
A
V
V
V
V
W
DRIVER
=
(
)(
)(
)
+
)
=
3
84
.
33
.
1
33
30
5515
011
.
.
The average I
VX
required is:
P
V
X
W
V
mA
DRIVER
=
=
011
33
.
34
.
Fused-lead packages conduct most of their heat out the
leads. This makes it very important to provide as much PC
board copper around the leads as is practical. Total
thermal resistance of the package-board combination is
dominated by the characteristics of the board in the
immediate area of the package. This means both lateral
thermal resistance across the board and vertical thermal
resistance through the board to other copper layers. Each
layer acts as a thermal heat spreader that increases the
heat sinking effectiveness of extended areas of the board.
Total board area becomes an important factor when the
area of the board drops below about 20 square inches. The
graph in Figure 8 shows thermal resistance vs board area
for 2-layer and 4-layer boards with continuous copper
planes. Note that 4-layer boards have significantly lower
thermal resistance, but both types show a rapid increase
for reduced board areas. Figure 9 shows actual measured
lead temperatures for chargers operating at full current.
Battery voltage and input voltage will affect device power
dissipation, so the data sheet power calculations must be
used to extrapolate these readings to other situations.
Vias should be used to connect board layers together.
Planes under the charger area can be cut away from the
rest of the board and connected with vias to form both a
For example, V
X
= 3.3V then:
1.5mA V
V
V
7.5mA
0.012 I
P
I
V
55 V
)(
P
I
R
V
V
t
V
I
f
BAT
BAT
IN
BAT
DRIVER
BAT
BAT
2
IN
SW
BAT
2
SW
BAT
IN
OL
IN
BAT
=
(
)
)
+
(
)
]
=
(
)(
)
+
)
)
+
(
=
(
) (
)(
)(
)( )
1
30
V
BAT
R
SW
= Switch ON resistance
≈
0.16
t
OL
= Effective switch overlap time
≈
10ns
f = 200kHz
Example: V
IN
= 15V, V
BAT
= 8.4V, I
BAT
= 3A;
=
(
+
(
[
P
3.5mA 15
1.5mA 8.4
8.4
15
7.5mA
0.012 3
0.27W
P
( )(
5515
0.33W
P
3
0.16 8.4
15
10
( )( )(
0.81 0.09
0.9W
BIAS
2
DRIVER
2
SW
2
9
+
)
)
+
(
]
=
=
)
+
=
=
( ) (
)
+
)
=
=
1
84
30
.
Total Power in the IC is: 0.27 + 0.33 + 0.9 = 1.5W
Temperature rise will be (1.5W)(30
°
C/W) = 45
°
C. This
assumes that the LT1511 is properly heat sunk by con-
necting the seven fused ground pins to expanded traces
and that the PC board has a backside or internal plane for
heat spreading.
The P
DRIVER
term can be reduced by connecting the boost
diode D2 (see Figure 1) to a lower system voltage (lower
than V
BAT
) instead of V
BAT
.
Then P
DRIVER
=
(
)(
)( )
(
V
IN
55
+
)
I
V
V
V
30
BAT
BAT
X
X
1
SW
BOOST
SPIN
1511 F07
LT1511
V
X
I
VX
C2
D2
10
μ
F
L1
+
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1511CSW#PBF 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁(yè)面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2
LT1511CSW#TR 功能描述:IC CHARGER BATT CONST V/I 24SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LT1511CSW#TRPBF 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LT1511CSWPBF 制造商:Linear Technology 功能描述:LT1511CSWPBF
LT1511ISW 功能描述:IC BATT CHRGR CONST I/V 3A24SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
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