參數(shù)資料
型號(hào)： LTC1760CFW
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Dual Smart Battery System Manager
中文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO48
封裝： 6.10 MM, PLASTIC, TSSOP-48
文件頁(yè)數(shù)： 34/44頁(yè)
文件大?。?/td> 379K
代理商： LTC1760CFW
LTC1760
34
sn1760 1760is
with reductions of charger current caused by adapter
limiting. It is recommended that input limiting feature be
defeated in such cases. Consult the battery manufacturer
for information on how your battery terminates charging.
Setting Charger Output Current Limit
The LTC1760 current DAC and the PWM analog circuitry
must coordinate the setting of the charger current. Failure
to do so will result in incorrect charge currents.
Table 2. Recommended Resistor Values
I
MAX
(A)
R
SENSE
(
) 1%
1
2
3
4
R
SENSE
(W)
0.25
0.25
0.5
0.5
R
ILIM
(
) 1%
0
10k
33k
Open
0.100
0.05
0.025
0.025
Warning
DO NOT CHANGE THE VALUE OF R
ILIM
DURING OPERA-
TION. The value must remain fixed and track the R
SENSE
value at all times. Changing the current setting can result
in currents that greatly exceed the requested value and
potentially damage the battery or overload the wall adapter
if no input current limiting is provided.
Setting Charger Output Voltage Limit
The value of an external resistor connected from the V
LIMIT
pin to GND determines one of five voltage limits that are
applied to the charger output value. See Table 3. These
limits provide a measure of safety with a hardware restric-
tion on charging voltage, which cannot be overridden by
software. This voltage sets the limit that will be applied to
the battery as reported by battery. Since the battery
internal voltage monitor point is the actual cell voltage, you
may see higher voltages, up to 512mV higher, at the
external charger terminals due to the voltage servo loop
action. See Operations section 3.6 for more information
on the voltage servo system.
Table 3. Recommended Resistor Values for R
VLIM
V
MAX
Up to 8.4V
Up to 12.6V
Up to 16.8V
Up to 21.0V
Up to 32.7V (No Limit)
R
VLIM
±
1%
0
(Short to ground)
10k
33k
100k
Open (or short to V
CC2
)
Inductor Selection
Higher operating frequencies allow the use of smaller
inductor and capacitor values. A higher frequency gener-
ally results in lower efficiency because of MOSFET gate
charge losses. In addition, the effect of inductor value on
ripple current and low current operation must also be
considered. The inductor ripple current
I
L
decreases
with higher frequency and increases with higher V
IN
.
I
f L
V
V
V
L
OUT
OUT
IN
=
( )( )
1
1
Accepting larger values of
I
L
allows the use of low
inductances, but results in higher output voltage ripple
and greater core losses. A reasonable starting point for
setting ripple current is
I
L
= 0.4(I
MAX
). In no case should
I
L
exceed 0.6(I
MAX
) due to limits imposed by IREV and
CA1. Remember the maximum
I
L
occurs at the maxi-
mum input voltage. In practice 10
μ
H is the lowest value
recommended for use.
Charger Switching Power MOSFET and Diode
Selection
Two external power MOSFETs must be selected for use
with the LTC1760 charger: An N-channel MOSFET for the
top (main) switch and an N-channel MOSFET for the
bottom (synchronous) switch.
The peak-to-peak gate drive levels are set by the V
CC
voltage. This voltage is typically 5.2V. Consequently, logic-
level threshold MOSFETs must be used. Pay close atten-
tion to the B
VDSS
specification for the MOSFETs as well;
many of the logic level MOSFETs are limited to 30V or less.
Selection criteria for the power MOSFETs include the “ON”
resistance R
DS(ON)
, reverse transfer capacitance C
RSS
,
input voltage and maximum output current. The LTC1760
charger is always operating in continuous mode so the
duty cycles for the top and bottom MOSFETs are given by:
Main Switch Duty Cycle = V
OUT
/V
IN
Synchronous Switch Duty Cycle = (V
IN
– V
OUT
)/V
IN
The MOSFET power dissipations at maximum output
current are given by:
APPLICATIOU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1760CFW#PBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 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:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC1760CFW#PBF 制造商:Linear Technology 功能描述:Battery Management IC 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 4.28A, TSSOP-48
LTC1760CFW#TR 功能描述:IC MANAGER BATTERY SYS 48-TSSOP 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)
LTC1760CFW#TRPBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP 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)
LTC1760CFWPBF 制造商:Linear Technology 功能描述:Dual Smart Battery Sys. Manager TSSOP48
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