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参数资料
| 型号： | LTC1729CS8-8.4#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 12/16页 |
| 文件大小： | 216K |
| 代理商： | LTC1729CS8-8.4#TR |
5
LTC1729 Series
OVP (Pin 1): Connection to an Internal Precision Resistor
Divider Used as a Voltage Feedback Monitor for Constant-
Voltage Mode Charging.
BAT (Pin 2): Input to Battery Monitor Circuits and OVP
Resistor Divider. The battery monitor circuits activate
trickle charge preconditioning, battery present detection
and C/10 current detection. This pin is in a high impedance
state when VCC is below the undervoltage lockout thresh-
old. During trickle charge preconditioning and charging
the BAT pin sources 12mA and 1.3mA respectively. The
current sources are clamped from driving the BAT pin
above 4.5V/cell with an internal pull-down transistor.
In the No Bat, Done and Pause states or the Hold and Reset
modes, the current sources are turned off, leaving only the
55k OVP divider as a load on the BAT pin. Most chargers
have a 200
A current source that will compensate for this
50
A to 80A load.
SENSE (Pin 3): Input to C/10 Current Detection Circuit.
This pin sinks 100
AduringtheChargestatewhichisused
to program the C/10 current threshold.
GND (Pin 4): Ground.
NTC (Pin 5): Input to the NTC Thermistor Monitoring
Circuits. When the voltage on this pin is above 2.79V
(cold) or below 0.405V (hot), the state machine is locked
in the present state and the timer is stopped. This is called
the Hold mode. While in the Hold mode, the charger is
turned off via the VC pin and the current sources on BAT
and SENSE pins are turned off. The STATUS pin is not
affected.
If the NTC pin is below 0.2V, the state machine is forced
in the reset mode with all the timers cleared to zero. The
current sources on the BAT pin and SENSE pin are
disabled leaving the 55k OVP divider. The STATUS pin is
pulled low in the Reset mode.
There is a 100
A current source on the NTC pin to bias the
NTC thermistor. This current source is active when the VCC
is greater than the undervoltage lockout threshold.
STATUS (Pin 6): Open-Drain Output for C/10 Charge
Termination Detection Circuit. When in the Charge state,
this pin is pulled low. Once the charge current drops below
the C/10 current threshold for three seconds, the pull-
down transistor is disabled, and a 50
A pull-down current
sink remains activated until the 1- or 3-hour time-out or
the battery or wall adapter is removed.
VC (Pin 7): Open-Drain Output for Turning Off the Charger.
When this pin is open circuit, the charger is active.
Normally this pin allows the charger to be active for three
hours.
VCC (Pin 8): Input Supply. For 4.1V or 4.2V single cell
operation, VCC should be between 8V and 28V with the IC
turning off when VCC drops below 6V. For 2-cell applica-
tions, the undervoltage lockout is 10.4V with a minimum
VCC of 12V. Removing the wall adapter will trigger an
undervoltage lockout and put the IC in a high impedance
condition. When the supply is connected, the IC is initial-
ized in the Reset mode with the state machine forced in the
Charge state with all the timers set to zero.
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