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参数资料
| 型号： | LTC1734ES6-4.2#TR |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR LI-ION LIN SOT23-6 |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 4.55 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1734ES6-4.2TR |
LTC1734
APPLICATIO N S I N FOR M ATIO N
Programming Constant Current
When in the constant current mode, the full-scale charge
current (C) is programmed using a single external resistor
between the PROG pin and ground. This charge current
will be 1000 times greater than the current through the
program resistor. The program resistor value is selected
by dividing the voltage forced across the resistor (1.5V)
by the desired resistor current.
The LTC1734 is designed for a maximum current of
approximately 700mA. This translates to a maximum
PROG pin current of 700 μ A and a minimum program
resistor of approximately 2.1k. Because the PROG pin is in
a closed-loop signal path, the pole frequency must be kept
high enough to maintain adequate AC stability by avoiding
excessive capacitance on the pin. See the Stability section
for more details.
The minimum full-scale current that can be reliably pro-
grammed is approximately 50mA, which requires a pro-
gram resistor of 30k. Limiting capacitive loading on the
program pin becomes more important when high value
program resistors are used. In addition, the current
monitoring accuracy can degrade considerably at very
low current levels. If current monitoring is desired, a
minimum full-scale current of 200mA is recommended.
Different charge currents can be programmed by various
means such as by switching in different program resistors
as shown in Figures 2 and 3. A voltage DAC connected
through a resistor to the PROG pin or a current DAC
connected in parallel with a resistor to the PROG pin can
also be used to program current (the resistor is required
with the I DAC to maintain AC stability as discussed in the
Stability section). Another means is to use a PWM output
from a microcontroller to duty cycle the charger into and
out of shutdown to create an average current (see Manual
Shutdown section for interfacing examples). Because
chargers are generally slow to respond, it can take up to
approximately 300 μ s for the charger to fully settle after a
shutdown is deasserted. This delay must be accounted for
unless the minimum PWM low duration is about 3ms or
more. Shutdown occurs within a few microseconds of a
shutdown command. The use of PWM can extend the
average current to less than the normal 200mA minimum
constant current.
CHARGE
CURRENT
MONITOR
(FILTERED)
OPTIONAL FILTER
1k
0.1 μ F TO
0.5 μ F
PIN 4
CHARGE
CURRENT
MONITOR
(UNFILTERED)
V IN
5V
3k
1 μ F
3
V CC I SENSE
LTC1734
2
GND DRIVE
4
PROG BAT
7.5k
1
6
5
FZT549
I BAT
10 μ F
CHARGE CURRENT CONTROL 1 CONTROL 2
0 LOW LOW
200mA LOW HIGH
500mA HIGH LOW
700mA HIGH HIGH
SINGLE
Li-Ion
BATTERY
CONTROL 1
Q1
2N7002
CONTROL 2
Q2
2N7002
1734 F02
Figure 2. Logic Control Programming of Output Current to 0mA, 200mA, 500mA or 700mA
V IN
5V
1 μ F
3
2
V CC I SENSE
LTC1734
GND DRIVE
1
6
FZT549*
4
PROG
BAT
5
I LOAD
CURRENT CONTROL 1 CONTROL 2
0 LOW LOW
3k
Q1
7.5k
Q2
LOAD
1734 F03
200mA
500mA
700mA
LOW
HIGH
HIGH
HIGH
LOW
HIGH
2N7002
2N7002
*OBSERVE MAXIMUM TEMPERATURE
CONTROL 1
CONTROL 2
Figure 3. Programmable Current Source with Output Current of 0mA, 200mA, 500mA or 700mA
8
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