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參數(shù)資料
| 型號： | LT1239 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Backup Battery Management Circuit(后備電池管理電路) |
| 中文描述： | 備份電池管理電路（后備電池管理電路） |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LT1239 |
11
LT1239
APPLICATIO
S I
FOR
ATIO
U
backup batteries have been completely discharged. Once the
backup batteries are charged the power in regulator 1 drops
significantly. The power in regulator 2 when regulator 2 is
providing power to the memory will be equal to:
(V
BACKUPBATTERY
– 4.85V)
×
I
OUT
I
OUT
is the current needed to power the memory and power
monitoring circuitry.
Example: (6.8V – 4.85V)
×
30mA = 58.5mW
The power in the comparator when the comparator is provid-
ing power to the memory will be equal to:
(V
SAT
×
I
OUT
)
I
OUT
is the current needed to power the memory and power
monitoring circuitry. Comparator Output Saturation Voltage
vs Output Current can be found in the Typical Performance
Characteristics.
Example: (V
SAT
×
I
LOAD
) = (0.15V
×
30mA) = 4.5mW
W
U
U
Note that power for memory will be supplied by either
regulator 2 or the comparator. The power in the error
amplifier when the cells are unequalized will be equal to:
(
V
BACKUPBATTERY
/2
) ×
3mA
Example: (6.8V/2)
×
3mA = 10.2mW
This component goes to zero when the cell voltages are
equalized.
The thermal resistance of the LT1239 is 120
°
C/W when
the device is mounted to a PC board with at least one
ground or power plane. The junction temperature rise will
be equal to the total power in the device multiplied by
120
°
C/W or (P
TOTAL
×
120
°
C/W). For 300mW dissipation
the junction temperature rise will be (300mW
×
120
°
C/W)
= 36
°
C. Given that the thermal limit temperature is ap-
proximately 100
°
C, this allows for a maximum ambient
temperature of roughly 60
°
C before the device thermal
limits. This temperature is near the maximum ambient
allowed for most battery types.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Figure 5. Adding a Protection Resistor for Lithium-Ion Charger
LT1239
IN 1
GND
OUT 1
I
MON1
ADJ
E/A (IN)
E/A (0UT)
R3
604k
LT1239 F05
+
+
10
μ
F
MAIN
BATTERY
PACK
R4 >
V1 – V2
MAX CHARGE CURRENT
R2
69.8k
R1
681k
V
1
V
2
3.4V Li-Ion
CELL
3.4V Li-Ion
CELL
*R4
C1
300pF
*THIS RESISTOR IS REQUIRED
BY SOME SAFETY AGENCIES.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1239_02 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Backup Battery Management Circuit |
| LT1239CS | 功能描述:IC BATT BACKUP MNGMNT SYS 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LT123A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:5 Volt, 3 Amp Voltage Regulator |
| LT123AK | 制造商:LINER 制造商全稱:Linear Technology 功能描述:5 Volt, 3 Amp Voltage Regulator |
| LT123AK/883 | 制造商:Linear Technology 功能描述: |
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