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| 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： | 14/16页 |
| 文件大小： | 216K |
| 代理商： | LTC1729CS8-8.4#TR |
7
LTC1729 Series
Overview
The LTC1729 is a charge termination controller for the
LT1505/LT1510/LT1511/LT1512/LT1513/LT1769 con-
stant-voltage/constant-current battery charger family.
Table 1 details these chargers. The primary function of this
IC is to stop the charger after three hours of constant-
voltage/constant-current charging. The secondary func-
tion of this controller includes an indication when the
charge current (during constant-voltage mode) drops
below a user-selected threshold. A 500kHz Li-Ion cell
phone charger is shown in Figure 1. The LTC1729 requires
only six external components when combined with the
standard LT1510 application. The LTC1729 provides a
complete and tiny solution for cellular phones and other
portable applications.
Table 1. Battery Chargers
LT1505
4A Step-Down Charger with Input Current Limit
LT1510
1.5A Step-Down Charger
LT1510-5
1.5A 500kHz Step-Down Charger
LT1511
3A Step-Down Charger with Input Current Limit
LT1512
2A Switch SEPIC Charger
LT1513
3A Switch SEPIC Charger
LT1769
2A Step-Down Charger with Input Current Limit
Block Diagram
Figure 2 shows the block diagram of the LTC1729. The IC
consists of six comparators, a resistive divider, a UVLO
block and a logic and timer block.
100
A
50
A
1729 F03
–
+
COMP1
STATUS
VCC
CHARGE
LED
LTC1729
SENSE
BAT
+
–
R2
200
20mV
IBIAS
20mV
R1
0.2
CHARGING
CURRENT
C1
1
F
3-SEC
FILTER
LOGIC
AND
TIMERS
Figure 3. C/10 Detection Circuit
Comparator COMP1 is used to indicate C/10 charge cur-
rent threshold. (“C” is a term used to indicate the Ampere-
hour capacity of a cell.) Figure 3 details the C/10 detection
circuit. The resistor and capacitor on the SENSE pin filter
the signal from the 0.2
current sense resistor R1. The
100
A current sink on the SENSE pin develops 20mV
across the 200
resistor R2. This sets a 20mV offset on
COMP1 that sense resistor R1 must equal before C/10
current is indicated. The C/10 is not recognized by the logic
until it passes through a 3-second digital filter.
For cases where there are multiple batteries to be charged,
the LTC1729 detects when a battery is removed and resets
the timers for the next charge cycle. The battery present
detection is the primary function of comparator COMP2.
When the battery is disconnected from the LTC1729, the
voltage at the BAT pin will begin ramping upward. This is
due to a current source inside the charger or an external
pull-up resistor. Once the voltage on the BAT pin exceeds
the 4.5V/cell limit, COMP2 signals a VMAX = true to the
logic and turns on a transistor that clamps the voltage.
There is the possibility of an overvoltage transient at the
charging terminals. This occurs if the battery protection
circuit, which is often included in the battery pack, opens
the connection to the battery during high current charging
(constant-current mode). This is a result of energy storage
in the inductor. COMP2 senses the overvoltage and clamps
the VC pin, reducing the duty cycle of the charger. If the
battery protection circuit quickly returns battery connec-
tion to the charger (in less than one second), then the
LTC1729 continues charging without resetting the timers.
APPLICATIO S I FOR ATIO
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