参数资料
| 型号： | LT3493IDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.2A 6DFN |
| 标准包装： | 500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 34.2 V |
| 输入电压： | 3.6 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 750kHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x3） |
LT3493
APPLICATIONS INFORMATION
FB Resistor Network
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the 1% resis-
tors according to:
of the V IN and BOOST pins. The input voltage should be
limited to the V IN operating range (36V) during overload
conditions (short-circuit or start-up).
Minimum On Time
R1 = R2
V OUT
0.78V
–1
The part will still regulate the output at input voltages that
exceed V IN(MAX) (up to 40V), however, the output voltage
R2 should be 20k or less to avoid bias current errors.
Reference designators refer to the Block Diagram.
An optional phase lead capacitor of 22pF between V OUT
and FB reduces light-load output ripple.
Input Voltage Range
The input voltage range for LT3493 applications depends
on the output voltage and on the absolute maximum rat-
ings of the V IN and BOOST pins.
The minimum input voltage is determined by either the
LT3493’s minimum operating voltage of 3.6V, or by its
maximum duty cycle. The duty cycle is the fraction of
time that the internal switch is on and is determined by
the input and output voltages:
ripple increases as the input voltage is increased. Figure 1
illustrates switching waveforms in continuous mode for a
3V output application near V IN(MAX) = 33V.
As the input voltage is increased, the part is required
to switch for shorter periods of time. Delays associated
with turning off the power switch dictate the minimum
on time of the part. The minimum on time for the LT3493
is ~120ns. Figure 2 illustrates the switching waveforms
when the input voltage is increased to V IN = 35V.
V SW
20V/DIV
DC =
V OUT + V D
V IN – V SW + V D
I L
0.5A/DIV
V OUT
where V D is the forward voltage drop of the catch diode
200mV/DIV
AC COUPLED
(~0.4V) and V SW is the voltage drop of the internal switch
(~0.4V at maximum load). This leads to a minimum input
voltage of:
C OUT = 10μF
V OUT = 3V
V IN = 30V
I LOAD = 0.75A
L = 10μH
2μs/DIV
3493 F01
V IN(MIN) =
V OUT + V D
DC MAX
– V D + V SW
Figure 1
with DC MAX = 0.91 (0.88 over temperature).
The maximum input voltage is determined by the absolute
maximum ratings of the V IN and BOOST pins. For con-
tinuous mode operation, the maximum input voltage is
determined by the minimum duty cycle DC MIN = 0.10:
V SW
20V/DIV
I L
0.5A/DIV
V OUT + V D
DC MIN
V IN(MAX) = – V D +V SW
Note that this is a restriction on the operating input voltage
for continuous mode operation; the circuit will tolerate
V OUT
200mV/DIV
AC COUPLED
C OUT = 10μF
V OUT = 3V
V IN = 35V
I LOAD = 0.75A
L = 10μH
2μs/DIV
3493 F02
transient inputs up to the absolute maximum ratings
Figure 2
3493fb
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3493IDCB-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN |
| LT3494 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Low Noise Boost Converters with Output Disconnect |
| LT3494A | 制造商:LINER 制造商全称:Linear Technology 功能描述:20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| LT3494AEDDB | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower Low Noise Boost Converters with Output Disconnect |
| LT3494AEDDB#PBF | 制造商:Linear Technology 功能描述:BOOST 2.3 - 16V 0.35A 40V 制造商:Linear Technology 功能描述:BOOST, 2.3 - 16V, 0.35A, 40V, 20QFN |
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