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參數(shù)資料
| 型號： | LTC4155EUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PQCC28 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 39/52頁 |
| 文件大小： | 473K |
| 代理商： | LTC4155EUFD#PBF |
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LTC4155
44
4155f
Figure 11. Single-Input Overvoltage Protection
Figure 12. Dual-Input Positive and Negative Voltage Protection
drainbreakdownvoltageratingofMN3andMN4andnega-
tive protection down to the drain breakdown voltage rating
of MN1 and MN2. Q1 and Q2 are small-signal transistors
to protect the gate oxides of MN1 or MN2. Note that it is
necessary to orient the N-channel MOSFETs with the drain
connections common and the source/body connections
to the input connector and the VBUS pin.
the inductor current will increase rapidly to the LTC4155’s
peak current clamp as incremental inductance tends to-
ward zero. If an overload condition persists with a small
inductor, it is possible that the inductor could be damaged
by its own resistive temperature rise.
The inductor core should be made from a material such as
ferrite,suitableforswitchingat2.25MHzwithoutexcessive
hysteretic losses. Table 37 lists several suitable inductors.
Table 37. Recommended Inductors
MANUFACTURER
PART NUMBER
DC
(mΩ)
IMAX
(A)
PACKAGE
(mm)
Vishay
IHLP2525AHE-B1ROMO1 17.5
7
6.5
× 6.9 ×3.2
Coilcraft
XFL4020-102ME
10.8 5.4
4
× 4 × 2.1
TDK
TDKLTF5022T1R2N4R2-LF 21
4.2 5 × 5.2 × 2.2
IMAX is the lower of the typical 30% saturation current and self-heating
current specifications.
Choosing the Battery Charger MOSFETs
TheLTC4155requiresasingleexternalP-channelMOSFET
connected between the CHGSNS and BATSNS pins to con-
ductbatterychargeandidealdiodecurrents.Thethreshold
voltage magnitude should be less than approximately
2.5V. (The P-channel threshold might be expressed as a
negative number, VGS(th), or as a positive number VSG(th).
Gateleakagecurrentshouldbebelow500nA.Drainvoltage
breakdownandgateoxidebreakdownvoltagesshouldboth
be above 5V in magnitude. The LTC4155 contributes ap-
proximately40mΩresistanceinthecurrentsensecircuitry
in series with the battery charger FET. Channel resistance,
RDS(ON),shouldbesmallrelativetothe40mΩformaximum
efficiency both charging the battery and delivering power
from the battery to the system load. Table 38 lists several
suitable P-channel transistors.
Optionally, a second P-channel MOSFET may be con-
nected in series with the first if the application requires
that power be cut off from any downstream devices on
VOUT in low power ship-and-store mode. Further details
about low power ship-and-store mode may be found in
the Operation section. The requirements for the second
device are the same as those enumerated above, with the
caveats that total gate leakage current is the sum of the
individual leakage currents and total RDS(ON) is the sum
of the individual RDS(ON)s.
APPLICATIONS INFORMATION
VBUS
TO POWER
INPUT
OVGCAP
USBGT
USBSNS
WALLGT
LTC4155
WALLSNS
4155 F11
R1
MN1
VBUS
TO USB
INPUT
TO WALL
INPUT
OVGCAP
USBGT
USBSNS
WALLGT
LTC4155
WALLSNS
4155 F12
MN1
R5
47k
R6
47k
C1
OPT
0.01F
R3, 5M
R4 5M
R1 3.6k
R2 3.6k
MN3
MN2
MN4
Q1
Q2
Q3
Q4
+
Choosing the Inductor
The LTC4155 is designed to operate with a 1H inductor,
with core saturation, winding resistance, and thermal
rise characteristics appropriate for the application’s peak
currents. The inductor current ripple magnitude is ap-
proximately 400mA under normal conditions, resulting in
a peak inductor current 200mA higher than the average
output current of the switching regulator. The average
output current of the step-down regulator is higher than
the average input current by the ratio VBUS/VOUT, neglect-
ing efficiency losses. The LTC4155 can tolerate transient
excursions beyond the inductor’s core saturation level, but
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| LTC4155IUFD#PBF | 功能描述:IC I2C POWER MANAGER DUAL 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:PowerPath™ 產品培訓模塊: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) |
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