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参数资料
| 型号： | LTC3552EDHC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT LI-ION 16-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.25 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x3） |
| 包装： | 带卷 (TR) |
LTC3552-1
OPERATIO
the P-channel switch increases with decreasing input
supply voltage (see Typical Performance Characteristics).
Therefore, the user should calculate the power dissipa-
tion when the regulator is used at 100% duty cycle with
low input voltage (see Thermal Considerations in the
Applications Information section).
APPLICATIO S I FOR ATIO
A typical LTC3552-1 application circuit is shown in
Low Supply Voltage Operation
To prevent unstable operation, the regulator incorporates
an undervoltage lockout circuit which shuts down the
regulators when the V CC voltage drops below approxi-
mately 1.65V.
threshold (I TERM ) is set by the following equation:
= CHG ? ,
Figure 2. External component selection is driven by
the charging requirements and the switching regulators
load requirements.
I TERM =
100 V
R TERM
I R PROG
10 R TERM
CHRG
V CC
R TERM =
V IN
4.5V TO
6.5V
V OUT2
1 μ F
825 ?
1.65k
4.7 μ H
V IN RUN1
ITERM
RUN2
PROG
BAT
PWR
LTC3552-1
EN
600m A
+
10 μ F
2.2 μ H
4.2V
1-CELL
Li-Ion
BATTERY
V OUT1
100 V
I TERM
The termination condition is detected by using an internal
?ltered comparator to monitor the ITERM pin. When the
1.575V/
400mA
C OUT2
10 μ F
CER
C FF2
330pF
SW2
V OUT2
V FB2
GND
SW1
V OUT1
V FB1
C FF1
330pF
1.8V/
800mA
C OUT1
10 μ F
CER
ITERM pin voltage drops below 100mV* for longer than
t TERM (typically 1ms), charging is terminated. The charge
current is latched off and the charger enters standby mode
R PROG =
, I CHG =
I CHG =
, R PROG =
I BAT = PROG ? 1000
35521 F02
Figure 2. LTC3552-1 Basic Circuit
Programming Charge Current
The charge current is programmed using a single resistor
from the PROG pin to ground. The charge current out of
the BAT pin is 1000 times the current out of the PROG
pin. The program resistor and the charge current are
calculated using the following equations:
1000 V 1000 V
I CHG R PROG
Charge current out of the BAT pin can be determined
anytime by monitoring the PROG pin voltage and using
the following equation:
V
R PROG
Programming Charge Termination
The charge cycle terminates when the charge current falls
below the programmed termination threshold. This thresh-
old is set by connecting an external resistor, R TERM , from
the ITERM pin to ground. The charge termination current
where the input supply current drops to 200μA. (Note:
Termination is disabled in thermal limiting mode).
I TERM can be set to be one tenth of I CHG by shorting the
ITERM pin to the PROG pin, thus eliminating the need
for external resistor R TERM . When con?gured in this way,
I TERM is always set to I CHG /10, and the programmed charge
current is set by the equation:
500 V 500 V **
R PROG I CHG
When charging, transient loads on the BAT pin can cause
the ITERM pin to fall below 100mV for short periods of
time before the DC charge current has dropped to 10%
of the programmed value. The 1ms ?lter time (t TERM ) on
the termination comparator ensures that transient loads of
this nature do not result in premature charge cycle termi-
nation. Once the average charge current drops below the
programmed termination threshold, the charger terminates
the charge cycle and ceases to provide any current out of
the BAT pin. In this state, any load on the BAT pin must
be supplied by the battery.
* Any external sources that hold the ITERM pin above 100mV will prevent the LTC3552-1
from terminating a charge cycle.
** These equations apply only when the ITERM pin is shorted to the PROG pin.
35521fa
12
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