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| 型号： | LT1512CS8 |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR CONST I/V 8-SOIC |
| 标准包装： | 100 |
| 功能： | 充电管理 |
| 电池化学： | 所有电池类型 |
| 电源电压： | 2.7 V ~ 25 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
LT1512
APPLICATIONS INFORMATION
CONNECT D2 ANODE HERE FOR FULLY
CHARGED BATTERY VOLTAGE LESS
THAN 3.5V. Q1 WILL NOT BE TURNED OFF
IN SHUTDOWN IF V IN IS PRESENT
CONNECT D2 ANODE HERE IF FULLY CHARGED
BATTERY VOLTAGE IS GREATER THAN 3.5V AND
Q1 MUST BE TURNED OFF IN SHUTDOWN WITH
V IN STILL ACTIVE
?
L1 A
V IN
V SW
C2
D2
1N4148
D1
C6
470pF
R5
470k
SHUTDOWN
S/S
LT1512
L1 B
R1
Q1
+
2N7002
GND
FB
R3
R2
1512 F03
Figure 3. Eliminating Divider Current
adequate drive to the transistor (even when the V IN voltage
is at its lowest operating point of 2.4V), the FET gate is
driven wth a peak detected voltage via D2. Note that there
are two connections for D2. The L1 A connection must be
used if the voltage divider is set for less than 3.5V (fully
charged battery). Gate drive is equal to battery voltage
plus input voltage. The disadvantage of this connection is
that Q1 will still be “on” if the V IN voltage is active and the
charger is shut down via the S/S pin. The L1 B connection
allows Q1 to turn off when V IN is off or when shutdown is
initiated, but the reduced gate drive (= V BAT ) is not adequate
to ensure a Q1 on-state for fully charged battery voltages
less than 3.5V. Do not substitute for Q1 unless the new
device has adequate V GS maximum rating, especially if
D2 is connected to L1A. C6 ?lters the gate drive and R5
pulls the gate low when switching stops.
Disconnecting the divider leaves only D1 diode leakage
as a battery drain. See Diode Selection for a discussion
of diode leakage.
Maximum Input Voltage
Maximum input voltage for the circuit in Figure 1 is partly
determined by battery voltage. A SEPIC converter has a
maximum switch voltage equal to input voltage plus out-
put voltage. The LT1512 has a maximum input voltage of
30V and a maximum switch voltage of 40V, so this limits
maximum input voltage to 30V, or 40V – V BAT , whichever
is less. Maximum V BAT = 40V – V IN .
Shutdown and Synchronization
The dual function S/S pin provides easy shutdown and
synchronization. It is logic level compatible and can be
pulled high or left ?oating for normal operation. A logic
low on the S/S pin activates shutdown, reducing input
supply current to 12μA. To synchronize switching, drive
the S/S pin between 600kHz and 800kHz.
Inductor Selection
L1A and L1B are normally just two identical windings on
one core, although two separate inductors can be used.
A typical value is 33μH, which gives about 0.25A peak-to-
peak inductor current. Lower values will give higher ripple
current, which reduces maximum charging current. 15μH
can be used if charging currents are at least 20% lower than
the values shown in the maximum charging current graph.
Higher inductance values give slightly higher maximum
charging current, but are larger and more expensive. A
low loss toroid core such as KoolMμ, Molypermalloy or
Metglas is recommended. Series resistance should be
less than 0.1Ω for each winding. “Open core” inductors,
such as rods or barrels are not recommended because
they generate large magnetic ?elds which may interfere
with other electronics close to the charger.
Input Capacitor
The SEPIC topology has relatively low input ripple current
compared to other topologies and higher harmonics are
1512fa
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1512CS8#PBF | 功能描述:IC BATT CHRGR CONST I/V 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LT1512CS8#TR | 功能描述:IC CHARGER BATT CONST V/I 8SOIC 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) |
| LT1512CS8#TRPBF | 功能描述:IC BATT CHRGR CONST I/V 8-SOIC 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) |
| LT1512CS8PBF | 制造商:Linear Technology 功能描述:LT1512CS8PBF |
| LT1512I | 制造商:LINER 制造商全称:Linear Technology 功能描述:SEPIC Constant-Current/ Constant-Voltage Battery Charger |
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