參數(shù)資料
型號(hào)： LT1511CSW
廠商： LINEAR TECHNOLOGY CORP
元件分類： 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)： 14/16頁(yè)
文件大?。?/td> 145K
代理商： LT1511CSW
14
LT1511
APPLICATIO
S I
FOR
ATIO
U
W
U
U
low thermal resistance system and to act as a ground
plane for reduced EMI.
Glue-on, chip-mounted heat sinks are effective only in
moderate power applications where the PC board copper
cannot be used, or where the board size is small. They
offer very little improvement in a properly laid out multi-
layer board of reasonable size.
Higher Duty Cycle for the LT1511 Battery Charger
Maximum duty cycle for the LT1511 is typically 90%, but
this may be too low for some applications. For example, if
an 18V
±
3% adapter is used to charge ten NiMH cells, the
charger must put out 15V maximum. A total of 1.6V is lost
in the input diode, switch resistance, inductor resistance
and parasitics, so the required duty cycle is 15/16.4 =
91.4%. As it turn out, duty cycle can be extended to 93%
by restricting boost voltage to 5V instead of using V
BAT
as
is normally done. This lower boost voltage also reduces
power dissipation in the LT1511, so it is a win-win deci-
sion. Connect an external source of 3V to 6V at V
X
node in
Figure 10 with a 10
μ
F C
X
bypass capacitor.
Even Lower Dropout
For even lower dropout and/or reducing heat on the board,
the input diode D3 should be replaced with a FET (see
Figure 11). It is pretty straightforward to connect a
P-channel FET across the input diode and connect its gate
to the battery so that the FET commutates off when the
input goes low. The problem is that the gate must be
pumped low so that the FET is fully turned on even when
the input is only a volt or two above the battery voltage.
Also there is a turn-off speed issue. The FET should turn
Figure 9. LT1511 Lead Temperature
BOARD AREA (IN
2
)
0
45
40
35
30
25
20
15
10
15
25
LT1511 F08
5
10
20
30
35
T
°
C
MEASURED FROM AIR AMBIENT
TO DIE USING COPPER LANDS
AS SHOWN ON DATA SHEET
2-LAYER BOARD
4-LAYER BOARD
Figure 8. LT1511 Thermal Resistance
BOARD AREA (IN
2
)
0
110
100
90
80
70
60
50
40
15
25
LT1511 F09
5
10
20
30
35
L
°
C
V
IN
= 16V
V
BAT
= 8.4V
I
CHRG
= 3A
T
A
= 25
°
C
NOTE: PEAK DIE TEMPERATURE WILL BE
ABOUT 10
°
C HIGHER THAN LEAD TEMPER-
ATURE AT 3A CHARGING CURRENT
2-LAYER BOARD
4-LAYER BOARD
4-LAYER BOARD
WITH V
BOOST
= 3.3V
SW
BOOST
SPIN
SENSE
BAT
V
BAT
C3
0.47
μ
F
D2
LT1511
SW
BOOST
SPIN
SENSE
BAT
V
X
3V TO 6V
C
X
10
μ
F
V
BAT
1511 F10
C3
0.47
μ
F
D2
LT1511
STANDARD CONNECTION
HIGH DUTY CYCLE CONNECTION
+
+
V
IN
SW
BOOST
SPIN
SENSE
BAT
V
CC
V
X
3V TO 6V
C
X
10
μ
F
V
BAT
1511 F11
C2
0.47
μ
F
D2
D1
R
X
50k
Q2
Q1
LT1511
HIGH DUTY CYCLE CONNECTION
Q1 = Si4435DY
Q2 = TP0610L
+
+
Figure 11. Replacing the Input Diode
Figure 10. High Duty Cycle
相關(guān)PDF資料
PDF描述
LT1511 Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting
LT1511ISW Constant-Current/ Constant-Voltage 3A Battery Charger with Input Current Limiting
LT1512CS8 CAP 220PF 250VAC CERAMIC Y2/X1
LT1512CN8 SEPIC Constant-Current/ Constant-Voltage Battery Charger
LT1512C Octal Bus Transceivers 20-PDIP 0 to 70
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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