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参数资料
| 型号： | LTC4075XEDD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | 3 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 14/16页 |
| 文件大小： | 195K |
| 代理商： | LTC4075XEDD#TRPBF |
LTC4075/LTC4075X
7
4075Xfa
USBIN (Pin 1): USB Input Supply Pin. Provides power to
the battery charger. The maximum supply current is 650mA.
This pin should be bypassed with a 1F capacitor.
IUSB (Pin 2): Charge Current Program for USB Power.
The charge current is set by connecting a resistor, RIUSB,
to ground. When charging in constant-current mode, this
pin servos to 1V. The voltage on this pin can be used to
measure the battery current delivered from the USB input
using the following formula:
I
V
R
BAT
IUSB
=
1000
ITERM (Pin 3): Termination Current Threshold Program.
The termination current threshold, ITERMINATE, is set by
connecting a resistor, RITERM, to ground. ITERMINATE is set
by the following formula:
I
V
R
TERMINATE
ITERM
=
100
When the battery current, IBAT, falls below the termination
threshold, charging stops and the
CHRG output becomes
high impedance.
This pin is internally clamped to approximately 1.5V. Driving
this pin to voltages beyond the clamp voltage can draw
large currents and should be avoided.
PWR (Pin 4): Open-Drain Power Supply Status Output.
When the DCIN or USBIN pin voltage is sufcient to begin
charging (i.e. when the supply is greater than the under-
voltage lockout threshold and at least 180mV above the
battery terminal), the
PWR pin is pulled low by an internal
N-channel MOSFET. Otherwise
PWR is high impedance.
This output is capable of sinking up to 10mA, making it
suitable for driving an LED.
CHRG (Pin 5): Open-Drain Charge Status Output. When
the LTC4075 is charging, the
CHRG pin is pulled low by
an internal N-channel MOSFET. When the charge cycle is
completed,
CHRG becomes high impedance. This output
is capable of sinking up to 10mA, making it suitable for
driving an LED.
ENABLE (Pin 6): Enable Input. When the LTC4075 is
charging from the DCIN source, a logic low on this pin
enables the charger. When the LTC4075 is charging from
the USBIN source, a logic high on this pin enables the
charger. If this input is left oating, an internal 2M
Ω
pulldown resistor defaults the LTC4075 to charge when
a wall adapter is applied and to shut down if only the USB
source is applied.
USBPWR (Pin 7): Open-Drain USB Power Status Output.
When the voltage on the USBIN pin is sufcient to begin
charging and there is insufcient power at DCIN, the USB-
PWR pin is high impedance. In all other cases, this pin is
pulled low by an internal N-channel MOSFET, provided that
there is power present at the DCIN, USBIN, or BAT inputs.
This output is capable of sinking up to 1mA, making it
suitable for driving high impedance logic inputs.
IDC (Pin 8): Charge Current Program for Wall Adapter
Power. The charge current is set by connecting a resis-
tor, RIDC, to ground. When charging in constant-current
mode, this pin servos to 1V. The voltage on this pin can
be used to measure the battery current delivered from the
DC input using the following formula:
I
V
R
BAT
IDC
=
1000
BAT (Pin 9): Charger Output and Regulator Input. This pin
provides charge current to the battery and regulates the
nal oat voltage to 4.2V.
DCIN (Pin 10): Wall Adapter Input Supply Pin. Provides
power to the battery charger. The maximum supply
current is 950mA. This should be bypassed with a 1
μF
capacitor.
Exposed Pad (Pin 11): GND. The exposed backside of the
package is ground and must be soldered to PC board ground
for electrical connection and maximum heat transfer.
PI FU CTIO S
UU
U
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