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參數(shù)資料
| 型號： | LTC4110EUHF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38 |
| 封裝： | 5 X 7 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 40/52頁 |
| 文件大小： | 450K |
| 代理商： | LTC4110EUHF |
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LTC4110
45
4110fb
Figure 19. SMBus Protection
CONNECTOR
TO BATTERY
TO SYSTEM
4110 F19
VDD
INPUT AND OUTPUT CAPACITORS
The LTC4110 uses a synchronous yback regulator to
provide high battery charging current. A chip ceramic
capacitor is recommended for both the input and output
capacitors because it provides low ESR and ESL and can
handle the high RMS ripple currents. However, some
Hi-Q capacitors may produce high transients due to self
resonance under some start-up conditions, such as con-
necting the charger input to a hot power source. For more
information, refer to Application Note 88.
For charge mode, the ripple current can be calculated as
follows:
I
E
NV
V
RMSDCINCAP
CHG
BAT
DCIN
=
and
II
V
NV
RMSBATCAP
CHG
BAT
DCIN
=
For calibration mode, the ripple current can be calculated
as follows:
II
E
NV
V
RMSDCINCAP
CAL
BAT
DCIN
=
and
II
V
NV
RMSBATCAP
CAL
BAT
DCIN
=
EMI considerations usually make it desirable to minimize
ripple current in the battery leads, and beads or induc-
tors may be added to increase battery impedance at the
300kHz switching frequency. Switching ripple current splits
between the battery and the output capacitor depending
on the ESR of the output capacitor and the battery imped-
ance. If the ESR of the output capacitor is 0.1Ω and the
battery impedance is raised to 2v with a bead or induc-
tor, only 5% of the ripple current will ow in the battery.
APPLICATIONS INFORMATION
Similar techniques may also be applied to minimize EMI
from the input leads.
Diodes
Schottky diodes should be placed in parallel with the drain
and source of the Flyback MOSFETs. This prevents body
diode turn-on and improves efciency by eliminating loss
from reverse recovery in these diodes. It also reduces
conduction loss during the dead time of the MOSFETs.
PROTECTING SMBUS PINS
The SMBus inputs, SCL and SDA, are exposed to uncon-
trolled transient signals whenever a battery is connected
to the system. If the battery contains a static charge, the
SMBus inputs are subjected to transients that can cause
damage after repeated exposure. Also, if the battery’s posi-
tive terminal makes contact to the connector before the
negative terminal, the SMBus inputs can be forced below
ground with the full battery potential, causing a potential
for latch-up in any of the devices connected to the SMBus
inputs. Therefore, it is good design practice to protect the
SMBus inputs as shown in Figure 19.
START-UP DELAYS
When exiting shutdown mode, internal supplies must
ramp up and settle. 500μs-1ms should be adequate after
shutdown is exited or when power is quickly (<100μs)
rst applied to the IC. For slow power ramp-up (>1ms)
internal supplies will be in regulation after power input
reaches 4.5V. Until internal supplies settle, status outputs
may be invalid.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4110EUHF#PBF | 功能描述:IC BATTERY BACKUP MANAGER 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件: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: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） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
| LTC4110EUHF#PBF | 制造商:Linear Technology 功能描述:Battery Management IC |
| LTC4110EUHF#TRPBF | 功能描述:IC BATTERY BACKUP MANAGER 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學: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 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
| LTC4110EUHF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Battery Backup System Manager |
| LTC4110EUHF-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Battery Backup System Manager |
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