参数资料
型号: LT3501IFE#TRPBF
厂商: Linear Technology
文件页数: 10/30页
文件大小: 0K
描述: IC REG BUCK ADJ 3A DL 20TSSOP
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: 0.8 V ~ 23.8 V
输入电压: 3.1 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 250kHz ~ 1.5MHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 20-TSSOP-EP
LT3501
BLOCK DIAGRAM
R T /SYNC
ONE CHANNEL
V IN
CLK2
R3
V IN1
3 μ A
SHDN
INTERNAL
REGULATOR
AND
REFERENCE
7 μ A
+
CLK1
OSCILLATOR
AND
AGC
SLOPE
COMPENSATION
Σ
S
R
PRE
Q
DROPOUT
ENHANCEMENT
DRIVER
CIRCUITRY
BST
SW
C
C3
1.28V
+
SHUTDOWN
COMPARATOR
POR
UNDERVOLTAGE
TSD
+
+
IND
V OUT
L1
D
D
0.8V
C
S
LOWEST
VOLTAGE
V C CLAMP
+
FB
R1
R2
R Q
3.25mA
POWER GOOD
COMPARATOR
PGOOD
GND
SOFT-START
RESET
COMPARATOR
+
80mV
SS CLAMP
+
0.72V
3501 BD
SS
V C
C
Figure 1. Block Diagram (One of Two Switching Regulators Shown)
The LT3501 is dual-channel, constant-frequency, current
mode buck converter with internal 3A switches. Each
channel is identical with a common shutdown pin, internal
regulator, oscillator, undervoltage detect, thermal shutdown
and power-on reset.
If the SHDN pin is taken below its 1.28V threshold the
LT3501 will be placed in a low quiescent current mode.
In this mode the LT3501 typically draws 9μA from V IN1
and <1μA from V IN2 . In shutdown mode the PG is active
with a typical sink capability of 50μA for V IN1 voltage
greater than 2V.
When the SHDN pin is opened or driven above 1.28V,
the internal bias circuits turn on generating an internal
regulated voltage, 0.8V FB , 0.975V R T /SYNC references,
and a POR signal which sets the soft-start latch.
As the R T /SYNC pin reaches its 0.975V regulation point,
the internal oscillator will start generating two clock sig-
nals 180° out of phase for each regulator at a frequency
determined by the resistor from the R T /SYNC pin to ground.
Alternatively, if a synchronization signal is detected by the
LT3501 at the R T /SYNC pin, clock signals 180° out of phase
3501fd
10
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