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参数资料
| 型号： | LTC4160EUDC#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC20 |
| 封装： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 15/32页 |
| 文件大小： | 422K |
| 代理商： | LTC4160EUDC#TRPBF |
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LTC4160/LTC4160-1
22
41601fa
APPLICATIONS INFORMATION
There are MLCCs available with several types of dielectrics
each having considerably different characteristics. For
example, X7R MLCCs have the best voltage and tempera-
ture stability. X5R MLCCs have apparently higher packing
density but poorer performance over their rated voltage
and temperature ranges. Y5V MLCCs have the highest
packing density, but must be used with caution, because
of their extreme nonlinear characteristic of capacitance
versus voltage. The actual in-circuit capacitance of a
ceramic capacitor should be measured with a small AC
signal and DC bias as is expected in-circuit. Many vendors
specify the capacitance versus voltage with a 1VRMS AC
test signal and, as a result, over state the capacitance that
the capacitor will present in the application. Using similar
operating conditions as the application, the user must
measureorrequestfromthevendortheactualcapacitance
to determine if the selected capacitor meets the minimum
capacitance that the application requires.
Overvoltage Protection
VBUS can be protected from overvoltage damage with two
additional components, a resistor R1 and an N-channel
MOSFET MN1, as shown in Figure 5. Suitable choices for
MN1 are listed in Table 4.
Table 4. Recommended N-Channel MOSFETs for the Overvoltage
Protection Circuit
PART #
BVDSS
RON
PACKAGE
Si1472DH
30V
57mΩ
SC70-6
Si2302ADS
20V
60mΩ
SOT-23
Si2306BDS
30V
47mΩ
SOT-23
Si2316DS
30V
50mΩ
SOT-23
IRLML2502
20V
50mΩ
SOT-23
FDN372S
30V
50mΩ
SOT-23
NTLJS4114N
30V
35mΩ
WDFN6
R1 is a 6.2k resistor and must be rated for the power dis-
sipated during maximum overvoltage. In an overvoltage
condition the OVSENS pin will be clamped at 6V. R1 must
be sized appropriately to dissipate the resultant power.
For example, a 1/10W 6.2k resistor can have at most
√(PMAX 6.2kΩ) = 25V applied across its terminals. With
the 6V at OVSENS, the maximum overvoltage magnitude
that this resistor can withstand is 31V. A 1/4W 6.2k resis-
tor raises this value to 45V. OVSENS’s absolute maximum
current rating of 10mA imposes an upper limit of 68V
protection.
Reverse Voltage Protection
The LTC4160/LTC4160-1 can also be easily protected
against the application of reverse voltages, as shown in
Figure 6. D1 and R1 are necessary to limit the maximum
VGS seen by MP1 during positive overvoltage events. D1’s
breakdownvoltagemustbesafelybelowMP1’sBVGS.The
circuit shown in Figure 6 offers forward voltage protection
up to MN1’s BVDSS and reverse voltage protection up to
MP1’s BVDSS.
Figure 5. Overvoltage Protection
Figure 6. Dual Polarity Voltage Protection
R1
USB/WALL
ADAPTER
41601 F05
C1
MN1
VBUS
OVSENS
OVGATE
LTC4160/
LTC4160-1
Battery Charger Over Programming
The USB high power specification allows for up to 2.5W
to be drawn from the USB port. The LTC4160/LTC4160-1’s
bidirectional switching regulator in step-down mode con-
verts the voltage at VBUS to a voltage just above BAT on
VOUT, while limiting power to less than the amount pro-
grammedatCLPROG.Thechargershouldbeprogrammed
(with the PROG pin) to deliver the maximum safe charging
current without regard to the USB specifications. If there
is insufficient current available to charge the battery at the
programmed rate, the charge current will be reduced until
the system load on VOUT is satisfied and the VBUS cur-
rent limit is satisfied. Programming the charger for more
R2
R1
USB/WALL
ADAPTER
41601 F06
C1
D1
MN1
MP1
VBUS POSITIVE PROTECTION UP TO BVDSS OF MN1
VBUS NEGATIVE PROTECTION UP TO BVDSS OF MP1
VBUS
OVSENS
OVGATE
LTC4160/
LTC4160-1
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