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參數(shù)資料
| 型號(hào)： | LTC1759CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Smart Battery Charger |
| 中文描述： | 0.2 A BATTERY CHARGE CONTROLLER, 230 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-36 |
| 文件頁(yè)數(shù)： | 21/28頁(yè) |
| 文件大?。?/td> | 362K |
| 代理商： | LTC1759CG |
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21
LTC1759
Table 7. V
LIMIT
Trip Points and Ranges
NOMINAL
CHARGING
VOLTAGE (V
OUT
)
RANGE
2465mV < V
OUT
< 8432mV
2465mV < V
OUT
< 12640mV
2465mV < V
OUT
< 16864mV
2465mV < V
OUT
< 21056mV
2465mV < V
OUT
< 32768mV
EXTERNAL
RESISTOR
(R
VLIMIT
)
0
V
LIMIT
VOLTAGE
V
VLIMIT
< 0.09V
VCCP
GRANULARITY
16mV
10k
±
1%
0.17V
VDD
< V
VLIMIT
< 0.34V
VDD
0.42V
VCCP
< V
VLIMIT
< 0.59V
VDD
0.66V
VDD
< V
VLIMIT
< 0.84V
VDD
0.91V
VDD
< V
VLIMIT
16mV
33k
±
1%
32mV
100k
±
1%
32mV
Open or
Tied to V
DD
32mV
PROGRAMMED VALUE (V)
NOTE:
THE USER MUST ADJUST THE VALUE OF
THE EXTERNAL CURRENT SENSING COMPONENTS
(R
, R
S2
, R
, R
) TO MAINTAIN CONSISTENCY
WITH I
LIMIT
RANGES. SEE APPLICATIONS INFORMATION
0
C
O
(
25
20
15
10
5
0
10
20
25
1759 F06
5
15
30
35
Figure 6. Transfer Function of Charger
I
(FROM CA1 AMP)
1759 F07
+
–
R
SET
V
REF
I
SET
PROG
TO
ERROR
AMP
CHARGINGCURRENT()
VALUE
-
∑
MODULATOR
Figure 7. Current DAC Operation
The Voltage DAC Block
Note that the charge output voltage is offset by V
REF
.
Therefore, the value of V
REF
is subtracted from the SMBus
ChargingVoltage() value in order for the output voltage to
be programmed properly (without offset). If the
ChargingVoltage() value is below the nominal reference
voltage of the charger, nominally 2.465V, the charger
output voltage is programmed to zero. In addition, if the
ChargingVoltage() value is above the limit set by the V
LIMIT
pin, then the charger output voltage is set to the value
determined by the V
LIMIT
resistor and the VOLTAGE_OR
bit is set. These limits are demonstrated in Figure 6.
The Current DAC Block
The current DAC is a delta-sigma modulator which con-
trols the effective value of an external resistor, R
SET
, used
to set the current limit of the charger. Figure 7 is a
simplified diagram of the DAC operation. The delta-sigma
modulator and switch convert the ChargingCurrent() value,
received via the SMBus, to a variable resistance equal to:
1.25R
SET
/ChargingCurrent()/I
LIMIT[x]
)
Therefore, programmed current is equal to:
0.8V
REF
/R
SET
(ChargingCurrent()/I
LIMIT
[x]),
for ChargingCurrent() < I
LIMIT[x]
.
When a value less than 1/16th of the maximum current
allowed by I
LIMIT
is applied to the current DAC input, the
current DAC enters a different mode of operation. The
current DAC output is pulse width modulated with a high
I
LIMIT
/8
AVERAGE CHARGER CURRENT
1750 F08
~40ms
0
Figure 8. Charging Current Waveform in Low Current Mode
OPERATIOU
frequency clock having a duty cycle value of 1/8. There-
fore, the maximum output current provided by the charger
is I
MAX
/8. The delta-sigma output gates this low duty cycle
signal on and off. The delta-sigma shift registers are then
clocked at a slower rate, about 45ms/bit, so that the
charger has time to settle to the I
MAX
/8 value. The resulting
average charging current is equal to that requested by the
ChargingCurrent() value.
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| LTC1759CG#PBF | 功能描述:IC SMART BATTERY CHARGER 36SSOP RoHS:是 類(lèi)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(lèi)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(chēng):497-10526-2 |
| LTC1759CG#TR | 功能描述:IC CHARGER SMART BATTERY 36SSOP 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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