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參數(shù)資料
| 型號： | LTC4001-1EUF#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGC, QFN-16 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 227K |
| 代理商： | LTC4001-1EUF#TRPBF |
15
LTC4001-1
40011f
to VADAPTER. Battery charging current continues to drop as
the VBAT rises, dropping to zero at VFLOAT. Because the
voltage drop in the LTC4001-1 is very low when charge
current is highest, power dissipation is also very low.
Thermal Calculations (PWM and Trickle Charging)
The LTC4001-1 operates as a linear charger when condi-
tioning (trickle) charging a battery and operates as a high
rate buck battery charger at all other times. Power dissipa-
tion should be determined for both operating modes.
For linear charger mode:
PD = (VIN – VBAT) ITRIKL + VIN IIN
where IIN is VIN current consumed by the IC.
Worst-case dissipation occurs for VBAT= 0, maximum VIN,
and maximum quiescent and trickle charge current. For
example with 5.5V maximum input voltage and 65mA
worst case trickle charge current, and 2mA worst-case
chip quiescent current:
PD = (5.5 – 0) 65mA + 5.5 2mA = 368.5mW
LTC4001-1 power dissipation is very low if a current
limited wall adapter is used and allowed to enter current
limit. When the wall adapter is in current limit, the voltage
drop across the LTC4001-1 charger is:
VDROP = ILIMIT RPFET
where ILIMIT is the wall adapter current limit and RPFET is
the on resistance of the topside PMOS switch.
The total LTC4001-1 power dissipation during current
limited charging is:
PD = (VBAT + VDROP) (IIN + IP) + VDROP ILIMIT
where IIN is the chip quiescent current and IP is total
current flowing through the IDET and PROG programming
pins. Maximum dissipation in this mode occurs with the
highest VBAT that keeps the wall adapter in current limit
(which is very close to VFLOAT), highest quiescent current
IIN, highest PMOS on resistance RPFET, highest ILIMIT and
highest programming current IP.
Assume the LTC4001-1 is programmed for 2A charg-
ing and 200mA IDET and that a 1.5A wall adapter is
being used:
ILIMIT = 1500mA, RPFET = 127m, IIN = 2mA, IP = 4mA
and VBAT ≈ VFLOAT = 4.141V
then:
VDROP = 1500mA 127m = 190.5mV
and:
PD = (4.141V + 0.1905V) (2mA + 4mA) + 0.1905V
1500mA = 312mW
Power dissipation in buck battery charger mode may be
estimated from the dissipation curves given in the Typical
Performance Characteristics section of the data sheet.
This will slightly overestimate chip power dissipation
because it assumes all loss, including loss from external
components, occurs within the chip.
APPLICATIO S I FOR ATIO
WU
UU
Figure 5. Charging Characteristic
LINEAR CHARGING
VADAPTER
VIN
VTRIKL
VFLOAT
40011 F05
VBAT
IBAT
ITRICKLE
WALL ADAPTER IN CURRENT LIMIT
VBAT + VDROP
ILIMIT
PWM
CHARGING
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4001EUF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 2000mA 4.2V 16-Pin QFN EP |
| LTC4001EUF#PBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN 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 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/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 |
| LTC4001EUF#TRPBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4001EUF-1#PBF | 功能描述:IC CHARGER LI-ION BUCK 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4001EUF-1#PBF | 制造商:Linear Technology 功能描述:IC BATT CHARGER SW MODE 16QFN |
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