参数资料
型号: LTC3412IFE#TRPBF
厂商: Linear Technology
文件页数: 7/20页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 16TSSOP
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: 0.8 V ~ 5 V
输入电压: 2.63 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 950kHz
电流 - 输出: 2.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 16-TSSOP-EP
LTC3412
FU CTIO AL BLOCK DIAGRA
SV IN
SGND
I TH
PV IN
0.8V
1
VOLTAGE
REFERENCE
8
3
SLOPE
COMPENSATION
RECOVERY
BCLAMP
PMOS CURRENT
COMPARATOR
+
9
16
+
V FB 4
ERROR
P-CH
0.74V
+
AMPLIFIER
SYNC/MODE
+
+
BURST
COMPARATOR
OSCILLATOR
SLOPE
COMPENSATION
10
11
SW
14
15
+
RUN/SS 7
RUN
N-CH
0.86V
LOGIC
+
PGOOD 2
NMOS
CURRENT
COMPARATOR
REVERSE
CURRENT
COMPARATOR
+
12
13
PGND
OPERATIO
5
R T
6
SYNC/MODE
3412 FBD
Main Control Loop
The LTC3412 is a monolithic, constant-frequency, current
mode step-down DC/DC converter. During normal opera-
tion, the internal top power switch (P-channel MOSFET) is
turned on at the beginning of each clock cycle. Current in
the inductor increases until the current comparator trips
and turns off the top power MOSFET. The peak inductor
current at which the current comparator shuts off the top
power switch is controlled by the voltage on the I TH pin.
The error amplifier adjusts the voltage on the I TH pin by
comparing the feedback signal from a resistor divider on
the V FB pin with an internal 0.8V reference. When the load
current increases, it causes a reduction in the feedback
voltage relative to the reference. The error amplifier raises
the I TH voltage until the average inductor current matches
the new load current. When the top power MOSFET shuts
off, the synchronous power switch (N-channel MOSFET)
turns on until either the bottom current limit is reached or
the beginning of the next clock cycle. The bottom current
limit is set at –2A for forced continuous mode and 0A for
Burst Mode operation.
The operating frequency is set by an external resistor
connected between the R T pin and ground. The practical
switching frequency can range from 300kHz to 4MHz.
3412fb
7
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