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参数资料
| 型号： | LTC1980EGN |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM BATT CHARGER/CONV 24-SSOP |
| 标准包装： | 55 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 2.85 V ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
LTC1980
OPERATIO
Lithium-Ion Battery Charger Operation
With the wall adapter power applied, the LTC1980 oper-
ates as a constant-current/constant-voltage PWM battery
charger, with a portion of the adapter current used for
charging and the rest flowing to the system load through
an optional low dropout regulator.
A charge cycle begins when the voltage at V REG exceeds
the undervoltage lockout threshold level and the IC is
enabled via the MODE pin. If the battery has been deeply
discharged and the battery voltage is less than 2.7V, the
charger will begin with the programmed trickle charge
current.
When the battery exceeds 2.7V, the charger begins the
constant-current portion of the charge cycle with the
charge current equal to the programmed level. As the
battery accepts charge, the voltage increases. When the
battery voltage reaches the recharge threshold, the pro-
grammable timer begins. Constant-current charging con-
tinues until the battery approaches the programmed charge
voltage of 4.1V or 4.2V/cell at which time the charge
current will begin to drop, signaling the beginning of the
constant-voltage portion of the charge cycle. The charger
U1 VOLTAGE
SELECTION
will maintain the programmed preset float voltage across
the battery until the timer terminates the charge cycle.
During trickle charging, if the battery voltage remains
below 2.7V for 1/4 of the total programmed charge time,
the battery may be defective and the charge cycle ends.
Also, if a battery open circuit is detected, the charge cycle
ends immediately. The charger can be shut down by
pulling the REG pin low, although the timer will continue
until it times out.
Power Converter Operation from Battery
When the AC adapter is removed, the LTC1980 operates as
a DC/DC PWM converter using the battery for input power
to provide a regulated output voltage for the system load.
The LTC1980 is a current mode switcher. This means that
the switch duty cycle is directly controlled by switch
current rather than by output voltage or current. Battery
charger operation will be described for the simplified
diagram (Figure 3). At the start of the oscillator cycle, latch
U9 is set causing M2 to turn on. When switch current
reaches a predetermined level M2 turns off and M1 turns
on. This level is set by the control voltage at the output of
error amplifier U10.
+
B1
V BAT
C1 SN1 SNUBBER
NETWORK
T1
V REG
SN2 SNUBBER
NETWORK
R1
C2
–
WALL
ADAPTER
U4
DRIVERS
BDRIVE
M1 M2
RDRIVE
R2
U2
DIRECTION
+
R12
C6
TO SYSTEM
LOAD
SENSE
V REF
V REF
R13
TYPICAL
WAVEFORM
+
CURRENT
AMPLIFIER
+
R5
U7
OSC
+
S
R
U9
Q
U5
ZC
R4
–
U6
–
SW1
R6
C3
–
U8
PWM
R7
R9
R8
C4
SW3
SW2
U10
R10
EA
U12
R11
U11
REFERENCE
C5
V REF
1980 F03
Figure 3. Simplified Diagram—Power Converter
1980f
10
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| LTC1980EGN#PBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC1980EGN#TR | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC1980EGN#TRPBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LTC1981ES5 | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 |
| LTC1981ES5#PBF | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 制造商:Linear Technology 功能描述:DP-Power Controller, CUT TAPE Single Micropower Hi Side Sw Controller 制造商:Linear Technology 功能描述:DRIVER, MOSFET, HIGH/LOW SIDE, SOT-23, Device Type:MOSFET, Module Configuration:High Side, Low Side, Supply Voltage Min:1.8V, Supply Voltage Max:5.5V, Driver Case Style:SOT-23, No. of Pins:5, Operating Temperature Min:-40C , RoHS Compliant: Yes |
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