参数资料
型号: LTC3733CG
厂商: Linear Technology
文件页数: 19/32页
文件大小: 0K
描述: IC CTRLR BUCK AMD 3PHASE 36-SSOP
标准包装: 37
应用: 控制器,AMD
输入电压: 4 V ~ 36 V
输出数: 1
输出电压: 0.8 V ~ 1.55 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
供应商设备封装: 36-SSOP
包装: 管件
产品目录页面: 1339 (CN2011-ZH PDF)
LTC3733/LTC3733-1
APPLICATIO S I FOR ATIO
Output Voltage
Table 1. VID Output Voltage Programming
The IC includes a digitally controlled 5-bit attenuator
producing output voltages as defined in Table 1. Output
voltages with 25mV increments are produced from 0.8V to
1.55V.
Each VID digital input is pulled up to a logical high with an
internal 150k resistor. The input logic threshold is ap-
proximately 1.2V but the input circuit can withstand an
input voltage of up to 7V.
ON/OFF Control
The RUN pin provides simple ON/OFF control for the
LTC3733. Driving the RUN pin above 1.5V permits the
controller to start operating. Pulling RUN below 0.8V puts
the LTC3733 into low current shutdown (I Q ≈ 20 μ A).
Soft-Start Function
The SS pin provides two functions: 1) soft-start and 2) a
defeatable short-circuit latch off timer. Soft-start reduces
the input power sources’ surge currents by gradually
increasing the controller’s current limit (proportional to an
internal buffered and clamped V ITH ). The latchoff timer
prevents very short, extreme load transients from tripping
the overcurrent latch. A small pull-up current (>5 μ A)
supplied to the SS pin will prevent the overcurrent latch
from operating. The following explanation describes how
this function operates.
An internal 1.5 μ A current source charges up the C SS
capacitor. As the voltage on SS increases from 0V to 2.4V,
the internal current limit is increased from 0V/R SENSE to
75mV/R SENSE . The output current limit ramps up slowly,
taking 1.6s/ μ F to reach full current. The output current
thus ramps up slowly, eliminating the starting surge
current required from the input power supply.
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VID3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VID2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
V OUT
1.550
1.525
1.500
1.475
1.450
1.425
1.400
1.375
1.350
1.325
1.300
1.275
1.250
1.225
1.200
1.175
1.150
1.125
1.100
1.075
1.050
1.025
1.000
0.975
0.950
0.925
0.900
0.875
0.850
0.825
0.800
Shutdown
t IRAMP =
2. 4 V – 0 V
1 . 5 μ A
C SS = ( 1 . 6 s / μ F ) C SS
The SS pin has an internal 6V zener clamp (see the
Functional Diagram).
3733f
19
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