LTC4075HVXEDD 查看數據表（PDF） - Linear Technology

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LTC4075HVXEDD

High Voltage Dual Input Li-Ion/Polymer Battery Charger

Linear Technology 

LTC4075HVX

PIN FUNCTIONS

USBIN (Pin 1): USB Input Supply Pin. This input provides

power to the battery charger assuming a voltage greater

than VUVUSB and less than VOVUSB is present (typically

3.95V to 6V respectively). However, the DCIN input will take

priority if a voltage greater than VUVDC and less than VOVDC

is present at DCIN (typically 4.15V to 6V respectively). The

USBIN input allows charge currents up to 850mA. This

pin should be bypassed with a 1μF 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:

IBAT

=

VIUSB

RIUSB

• 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:

ITERMINATE

=

100V

RITERM

When the battery current, IBAT, falls below the termination

threshold, charging stops and the ⎯C⎯H⎯R⎯G output becomes

high impedance. This pin is internally clamped to approxi-

mately 1.5V. Driving this pin to voltages beyond the clamp

voltage should be avoided.

⎯P⎯W⎯R (Pin 4): Open-Drain Power Supply Status Output.

When the DCIN or USBIN pin voltage is valid to begin charg-

ing (i.e. when the supply is greater than the undervoltage

lockout threshold, less than the overvoltage lockout thresh-

old and at least 120mV above the battery terminal), the

⎯P⎯W⎯R pin is pulled low by an internal N-channel MOSFET.

Otherwise ⎯P⎯W⎯R is high impedance. This output is capable

of driving an LED (see Table 1 for more detail).

⎯C⎯H⎯R⎯G (Pin 5): Open-Drain Charge Status Output. When

the LTC4075HVX is charging, the ⎯C⎯H⎯R⎯G pin is pulled low

by an internal N-channel MOSFET. When the charge cycle

is completed, C⎯ H⎯ R⎯ G⎯ becomes high impedance. This output

is capable of driving an LED.

ENABLE (Pin 6): Enable Input. When the LTC4075HVX is

charging from the DCIN source, a logic low on this pin

enables the charger. When the LTC4075HVX is charging

from the USBIN source, a logic high on this pin enables

the charger. If this input is left floating, an internal 2MΩ

pull-down resistor defaults the LTC4075HVX 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 sufficient to begin

charging and there is insufficient 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 either DCIN, USBIN, or BAT

inputs. This output is capable of driving an LED.

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:

IBAT

=

VIDC

RIDC

• 1000

BAT (Pin 9): Battery Charger Output. This pin provides

charge current to the battery and regulates the final float

voltage to 4.2V.

DCIN (Pin 10): Wall Adapter Input Supply Pin. This input

provides power to the battery charger assuming a voltage

greater than VUVDC and less than VOVDC is present (typi-

cally 4.15V to 6V respectively). A valid voltage on the DCIN

input will always take priority over the USBIN input. The

DCIN input allows charge currents up to 950mA. This pin

should be bypassed with a 1μF 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.

4075hvxf

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