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参数资料
| 型号： | LTC3561EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.63 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 最高 4MHz |
| 电流 - 输出： | 1A |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3561
BLOCK DIAGRA
SV IN
6
SGND
2
I TH
8
PV IN
5
0.8V
VOLTAGE
REFERENCE
I TH
PMOS CURRENT
COMPARATOR
LIMIT
+
+
–
V FB 7
–
ERROR
AMPLIFIER
V B
OSCILLATOR
SLOPE
COMPENSATION
+
3 SW
LOGIC
NMOS
–
COMPARATOR
+
OPERATIO
1
SHDN/R T
REVERSE
COMPARATOR
–
4 PGND
3561 BD
The LTC3561 uses a constant frequency, current mode
architecture. The operating frequency is determined by
the value of the R T resistor.
The output voltage is set by an external divider returned to
the V FB pin. An error amplifier compares the divided
output voltage with a reference voltage of 0.8V and adjusts
the peak inductor current accordingly.
Main Control Loop
During normal operation, the top power switch (P-channel
MOSFET) is turned on at the beginning of a clock cycle
when the V FB voltage is below the reference voltage. The
current into the inductor and the load increases until the
current limit is reached. The switch turns off and energy
stored in the inductor flows through the bottom switch (N-
channel MOSFET) into the load until the next clock cycle.
The peak inductor current is controlled by the voltage on
the I TH pin, which is the output of the error amplifier. This
amplifier compares the V FB pin to the 0.8V reference.
When the load current increases, the V FB voltage de-
creases slightly below the reference. This decrease causes
the error amplifier to increase the I TH voltage until the
average inductor current matches the new load current. At
low load currents, the inductor current becomes discontinu-
ous, and pulses may be skipped to maintain regulation.
The main control loop is shut down by pulling the SHDN/R T
pin to SV IN . A digital soft-start is enabled after shutdown,
which will slowly ramp the peak inductor current up over
1024 clock cycles or until the output reaches regulation,
whichever is first. Soft-start can be lengthened by ramping
the voltage on the I TH pin (see Applications Information
section).
Dropout Operation
When the input supply voltage decreases toward the
output voltage, the duty cycle increases to 100% which is
the dropout condition. In dropout, the PMOS switch is
turned on continuously with the output voltage being
equal to the input voltage minus the voltage drops across
the internal P-channel MOSFET and the inductor.
Low Supply Operation
The LTC3561 incorporates an undervoltage lockout circuit
which shuts down the part when the input voltage drops
below about 2.5V to prevent unstable operation.
3561f
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3562 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Quad Synchronous Step-Down DC/DC Regulator 2 × 600mA, 2 × 400mA |
| LTC3562EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 20QFN 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 |
| LTC3562EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 20QFN 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 |
| LTC3562EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Quad Synchronous Step-Down DC/DC Regulator 2 × 600mA, 2 × 400mA |
| LTC3562EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Quad Synchronous Step-Down DC/DC Regulator 2 × 600mA, 2 × 400mA |
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