参数资料
| 型号： | LT3032MPDE-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO +-5V .15A 14-DFN |
| 标准包装： | 91 |
| 稳压器拓扑结构： | 正和负固定式 |
| 输出电压： | ± 5V |
| 输入电压： | ±2.3 V ~ ±20 V |
| 电压 - 压降（标准）： | 0.27V @ 150mA，0.3V @ -150mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 170mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN（4x3） |
| 包装： | 管件 |
LT3032 Series
APPLICATIONS INFORMATION
20
0
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10μF
Stability and Input Capacitance
Low ESR, ceramic input bypass capacitors are acceptable
–20
–40
X5R
for applications without long input leads. However, applica-
tions connecting a power supply to an LT3032’s circuit’s
INP/INN and GND pins with long input wires combined
with low ESR, ceramic input capacitors are prone to voltage
–60
–80
Y5V
spikes, reliability concerns and application-speci?c board
oscillations. The input wire inductance found in many
battery-powered applications, combined with the low ESR
–100
0
2
4
6 8 10 12
DC BIAS VOLTAGE (V)
14
16
ceramic input capacitor, forms a high-Q LC resonant tank
circuit. In some instances this resonant frequency beats
3032 F03
Figure 3. Ceramic Capacitor DC Bias Characteristics
40
20
against the output current dependent LDO bandwidth and
interferes with proper operation. Simple circuit modi?ca-
tions/solutions are then required. This behavior is not
indicative of LT3032 instability, but is a common ceramic
input bypass capacitor application issue.
The self-inductance, or isolated inductance, of a wire is
0
–20
–40
–60
–80
Y5V
BOTH CAPACITORS ARE 16V,
X5R
directly proportional to its length. Wire diameter is not a
major factor on its self-inductance. For example, the self-
inductance of a 2-AWG isolated wire (diameter = 0.26”) is
about half the self-inductance of a 30-AWG wire (diameter
= 0.01”). One foot of 30-AWG wire has about 465nH of
self-inductance.
–100
1210 CASE SIZE, 10μF
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3032 F04
One of two ways reduces a wire’s self-inductance. One
method divides the current ?owing towards the LT3032
between two parallel conductors. In this case, the farther
Figure 4. Ceramic Capacitor Temperature Characteristics
apart the wires are from each other, the more the self-
inductance is reduced; up to a 50% reduction when placed
a few inches apart. Splitting the wires basically connects
two equal inductors in parallel, but placing them in close
proximity gives the wires mutual inductance adding to
the self-inductance. The second and most effective way
to reduce overall inductance is to place both forward and
return current conductors (the input and GND wires) in
very close proximity. Two 30-AWG wires separated by only
0.02”, used as forward– and return– current conductors,
OUTPUT SET TO 5V
3032 F05
reduce the overall self-inductance to approximately one-
?fth that of a single isolated wire.
Figure 5. Noise Resulting From Tapping on a Ceramic Capacitor
3032fd
18
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