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参数资料
| 型号： | LTC3548IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 400mA，800mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3548
BLOCK DIAGRAM
REGULATOR 1
MODE/SYNC
6
BURST
CLAMP
V IN
SLOPE
COMP
V FB1
1
0.6V
+
–
EA
I TH
0.35V
–
+
EN
BURST
SLEEP
–
I COMP
+
5Ω
S
R
RS
LATCH
Q
Q
0.55V
–
+
UVDET
UV
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI
SHOOT-
THRU
4 SW1
+
OVDET
OV
0.65V
–
SHUTDOWN
PGOOD1
I RCMP
V IN
11 GND
3 V IN
RUN1
RUN2
2
9
0.6V REF
OSC
OSC
POR
COUNTER
8 POR
5 GND
PGOOD2
REGULATOR 2 (IDENTICAL TO REGULATOR 1)
V FB2
10
7 SW2
3548 BD
OPERATION
The LTC3548 uses a constant-frequency, current mode
architecture. The operating frequency is set at 2.25MHz
and can be synchronized to an external oscillator. Both
channels share the same clock and run in-phase. To suit a
variety of applications, the selectable Mode pin allows the
user to choose between low noise and high ef?ciency.
The output voltage is set by an external divider returned
to the V FB pins. An error ampli?er compares the divided
output voltage with a reference voltage of 0.6V and adjusts
the peak inductor current accordingly. An undervoltage
comparator will pull the POR output low if the output
voltage is not above –8.5% of the reference voltage. The
POR output will go high after 262,144 clock cycles (about
117ms) of achieving regulation.
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 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 ?ows through the bottom
switch (N-channel MOSFET) into the load until the next
clock cycle.
The peak inductor current is controlled by the internally
compensated I TH voltage, which is the output of the
error ampli?er.This ampli?er compares the V FB pin to
the 0.6V reference. When the load current increases,
the V FB voltage decreases slightly below the reference.
3548fc
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3548IMSE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 400mA/800mA, 2.25MHz |
| LTC3548IMSE#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10MSOP 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 |
| LTC3548IMSE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 10MSOP 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 |
| LTC3548IMSE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548IMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
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