参数资料
| 型号： | LT3653IDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4.8 V ~ 6 V |
| 输入电压： | 7.5 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
LT3653
OPERATION
Please refer to the Block Diagram. The LT3653 is speci?-
cally tailored for use with a battery charger power path
controller. The LT3653 regulates the high voltage input to
a lower voltage to provide power to the system load and to
the single-cell Li-Ion battery charger. High ef?ciency in the
battery charger is achieved by keeping the voltage across
it low. To accomplish this, the battery charger takes control
of the LT3653 regulator control node, V C , and overrides
the error amp, G1. The output voltage is regulated by the
battery charger to a voltage slightly above the battery,
typically 300mV.
HVOK is a status pin which indicates to the charger that a
high voltage input is present and that the LT3653 is ready to
start providing power to the system load. When the HVOK
pin is low, the LT3653 is not switching and the system
output is not supported by the LT3653 regulator.
The LT3653 is a constant frequency, current mode step
down regulator. A switch cycle is initiated when the
1.5MHz oscillator enables the RS ?ip ?op, turning on
the internal power switch, Q1. The sense ampli?er (A1)
monitors the switch current via the voltage dropped
across the current sense resistor R SENSE1 . The compara-
tor compares the ampli?ed current signal with the output
(V C ) of the error ampli?er (G1). The switch is turned off
when this current exceeds a value determined by the
V C voltage. The error ampli?er monitors the V OUT volt-
age through an internal resistor divider and, when not
An active clamp (not shown) on the V C node provides
current limit. The LT3653 is internally compensated with
a pole zero combination.
An external capacitor and internal diode, D2, are used to
generate a voltage at the BOOST pin that is higher than
the input supply. This allows the driver to fully saturate the
internal bipolar NPN power switch for ef?cient operation.
The switch driver operates from either V IN or BOOST to
ensure startup.
An internal regulator provides power to the control circuitry.
This regulator includes input undervoltage and overvoltage
protection which disables switching action when V IN is less
than 7V and greater than 33V, typical. When switching is
disabled, the LT3653 safely sustains input voltages up to
60V. Note that while switching is disabled the output will
discharge.
Output current limiting is provided via the servo action
of ampli?er G2. The voltage across the sense resistor,
R SENSE2 , is compared to a voltage programmed by ex-
ternal resistor R1 on the I LIM pin. A capacitor averages
the inductor ripple current. If the averaged inductor cur-
rent exceeds the programmed value then the V C voltage
is pulled low, reducing the current in the regulator. The
output current limit circuit allows for lower current rated
power path components and provides better control of
system power dissipation.
driven externally servos the V C voltage to regulate V OUT .
If the V OUT voltage drops, the V C voltage will be driven
higher increasing the output current and V OUT voltage.
3653f
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3663EDCB#TRMPBF | 功能描述:IC REG BUCK ADJ 1.2A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3663EDCB#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3663EMS8E#PBF | 功能描述:IC REG BUCK ADJ 1.2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3663EMS8E#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR MSOP-8 |
| LT3663EMS8E#TRPBF | 功能描述:IC REG BUCK ADJ 1.2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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