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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)： | 4/52頁 |
| 文件大小： | 473K |
| 代理商： | LTC4155EUFD#PBF |
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LTC4155
12
4155f
PIN FUNCTIONS
SDA (Pin 1): Data Input/Output for the I2C Serial Port.
The I2C input levels are scaled with respect to DVCC for
I2C compliance.
DVCC (Pin 2): Logic Supply for the I2C Serial Port. DVCC
sets the reference level of the SDA and SCL pins for I2C
compliance. It should be connected to the same power
supply used to power the I2C pull-up resistors.
IRQ (Pin 3): Open-Drain Interrupt Output. The IRQ pin
can be used to generate an interrupt due to a variety of
maskable status change events within the LTC4155.
ID (Pin 4): USB A-Device Detection Pin. When wired to
a mini- or micro-USB connector, the ID pin detects when
the “A” side of a mini or micro-USB cable is connected
to the product. If the ID pin is pulled down, and the
LOCKOUT_ID_PIN bit is not set in the I2C port, the switch-
ing PowerPath operates in reverse providing USB power
to the VBUS pin from the battery. USB On-The-Go power
can only be delivered from the USB multiplexer path.
CLPROG1 (Pin 5): Primary VBUS Current Limit Program-
ming Pin. A resistor from CLPROG1 to ground determines
theupperlimitofthecurrentdrawnfromtheVBUSpinwhen
CLPROG1 is selected. A precise measure of VBUS current,
hCLPROG1–1, is sent to the CLPROG1 pin. The switching
regulatorincreasespowerdeliveryuntilCLPROG1reaches
1.2V. Therefore, the current drawn from VBUS will be lim-
ited to an amount given by the 1.2V reference voltage,
hCLPROG1 and RCLPROG1.
Typically CLPROG1 is used to override the USB compliant
input current control pin, CLPROG2, in applications where
USB compliance is not a requirement. This would be use-
ful for applications that use a dedicated wall adapter and
would rather not be limited to the 500mW start-up value
required by USB specifications. If USB compliance is a
requirement at start-up, CLPROG1 should be connected
to CLPROG2 and a single resistor should be used. See
the CLPROG2 pin description.
In USB noncompliant designs, the user is encouraged to
use an RCLPROG1 value that best suits their application
for start-up current limit. See the Operation section for
more details.
CLPROG2 (Pin 6): Secondary VBUS Current Limit Pro-
gram Pin. CLPROG2 controls the VBUS current limit when
either selected via I2C command or when CLPROG1 and
CLPROG2 are shorted together. When selected, a resistor
from CLPROG2 to ground determines the upper limit of
the current drawn from the VBUS pin. Like CLPROG1, a
precise fraction of VBUS current, hCLPROG2–1, is sent to the
CLPROG2 pin. The switching regulator increases power
delivery until CLPROG2 reaches 1.2V. Therefore, the cur-
rent drawn from VBUS will be limited to an amount given
by the 1.2V reference voltage, hCLPROG2 and RCLPROG2.
ThereareamultitudeofratiosforhCLPROG2availablebyI2C
control, three of which correspond to the 100mA, 500mA
and 900mA USB specifications. CLPROG2 is also used to
regulatemaximuminputcurrentintheUSBsuspendmode
and maximum output current in USB On-The-Go mode.
IfCLPROG1andCLPROG2areshortedtogetherattheonset
of available input power, the LTC4155 selects CLPROG2 in
the 100mA USB mode to limit input current. This ensures
USB compliance if so desired. For USB compliance in all
modes, the user is encouraged to make RCLPROG2 equal
to the value declared in the specification table.
WALLSNS (Pin 7): Highest Priority Multiplexer Input and
Overvoltage Protection Sense Input. WALLSNS should be
connected through a 3.6k resistor to a high priority input
power connector and one drain of two source-connected
N-channel MOSFET pass transistors. When voltage is
detected on WALLSNS, it draws a small amount of current
to power a charge pump which then provides gate drive to
WALLGT to energize the external transistors. If the input
voltage exceeds VOVLO, WALLGT will be pulled to GND
to disable the pass transistors and protect the LTC4155
from high voltage.
USBSNS (Pin 8): Lowest Priority Multiplexer Input and
Overvoltage Protection Sense Input. USBSNS should be
connected through a 3.6k resistor to a low priority input
power connector and one drain of two source-connected
N-channel MOSFET pass transistors. When voltage is
detected on USBSNS, and no voltage is detected on
WALLSNS, USBSNS draws a small amount of current to
power a charge pump which then provides gate drive to
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