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参数资料
| 型号： | LT3503EDCB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 6DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.78 V ~ 16.2 V |
| 输入电压： | 3.6 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.2MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
| 其它名称： | LT3503EDCB#TRMPBFDKR |
LT3503
APPLICATIO S I FOR ATIO
R 1 = R 2 ? OUT – 1 ?
FB Resistor Network
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the 1%
resistors according to:
? V ?
? 0 . 78 V ?
R2 should be 20.0k 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 LT3503 applications depends
on the output voltage and on the absolute maximum
ratings of the V IN and BOOST pins.
The minimum input voltage is determined by either the
LT3503’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:
In pulse-skipping mode the part skips pulses to control the
inductor current and regulate the output voltage, possibly
producing a spectrum of frequencies below 2.2MHz.
Note that this is a restriction on the operating input voltage
to remain in constant-frequency operation; the circuit will
tolerate transient inputs up to the absolute maximum
ratings of the V IN and BOOST pins when the output is in
regulation. The input voltage should be limited to V IN(PS)
during overload conditions (short-circuit or start-up).
Minimum On Time
The part will still regulate the output at input voltages that
exceed V IN(PS) (up to 20V), but the output voltage ripple
increases. Figure 1 illustrates switching waveforms in
continuous mode for a 0.78V output application near
V IN(PS) = 6V.
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 LT3503 is
~130ns. Figure 2 illustrates the switching waveforms
when the input voltage is increased to V IN = 14V.
DC =
V OUT + V D
V IN – V SW + V D
V SW
10V/DIV
where V D is the forward voltage drop of the catch diode
(~0.4V) and V SW is the voltage drop of the internal switch
(~0.4V at maximum load). This leads to a minimum input
I L
1A/DIV
V OUT
20mV/DIV
voltage of:
V IN ( MIN ) =
V OUT + V D
DC MAX
– V D + V SW
C OUT = 47 μ F
V OUT = 0.78V
V IN = 7V
I LOAD = 1.1A
L = 1.1 μ H
1 μ s/DIV
3503 F01
with DC MAX = 0.81 (0.76 over temperature).
The maximum input voltage is determined by the absolute
maximum ratings of the V IN and BOOST pins. For con-
stant-frequency operation the maximum input voltage is
determined by the minimum duty cycle, DC MIN = 0.29. If
V SW
10V/DIV
I L
1A/DIV
Figure 1
the duty cycle requirement is less than DC MIN , the part will
enter pulse-skipping mode. The onset of pulse-skipping
occurs at:
V OUT
20mV/DIV
C OUT = 47 μ F
V OUT = 0.78V
1 μ s/DIV
3503 F02
V IN ( PS ) =
V OUT + V D
DC MIN
– V D + V SW
V IN = 14V
I LOAD = 1.1A
L = 1.1 μ H
Figure 2
3503f
8
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| LT3504EUFD#TRPBF | 功能描述:IC REG BUCK ADJ 1A QUAD 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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