参数资料
型号: LTC3529EDCB#TRPBF
厂商: Linear Technology
文件页数: 6/12页
文件大小: 0K
描述: IC REG BOOST SYNC 5V 1.5A 8DFN
标准包装: 2,500
类型: 升压(升压)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 1.8 V ~ 5.25 V
PWM 型: 电流模式
频率 - 开关: 1.5MHz
电流 - 输出: 1.5A
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: 8-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 8-DFN(3x2)
LTC3529
BLOCK DIAGRAM
L1
4.7μH
V IN
1.8V
TO
5.25V
+
C IN
3.3μF
8
V IN
3
SHDN
2
SW
BULK CONTROL
SIGNALS
ANTI-RING
V IN
1
V OUT , 5V
6
V OUT
C OUT
10μF
SNSGND
CLOCK
PWM LOGIC
AND
DRIVERS
CURRENT
SENSE
IZERO
COMP
5
FAULT
FAULT OR
THERMAL
SHUTDOWN
REFERENCE
1.25V
22ms
FAULT TIMER
THERMAL SD
I LIM
COMP
PWM
COMP
+
SOFT-START
SD
R C
GM ERROR
AMPLIFIER
1.25V
R1
1.875M
OSCILLATOR
2A
+
C C
C2
R2
625k
7
RST
4
PGND
9
GND (BP)
3529 BD
OPERATION
The LTC3529 is a 1.5MHz synchronous boost converter in
an 8-lead 2mm × 3mm DFN package. The device operates
with an input voltage as low as 1.8V and features ?xed-
frequency current-mode PWM control for exceptional line
and load regulation. Internal MOSFET switches with low
R DS(ON) and low gate charge enable the device to maintain
high ef?ciency over a wide range of load current.
PWM Operation
light loads, the LTC3529 will exhibit pulse-skipping
operation.
Soft-Start
The LTC3529 provides soft-start by ramping the inductor
current limit from zero to its peak value in approximately
2ms. The internal soft-start capacitor is discharged in
the event of a fault, thermal shutdown or when the IC is
disabled via the SHDN pin.
The LTC3529 operates in a ?xed-frequency PWM mode
using current-mode control at all load currents. At very
3529fb
6
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