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参数资料
| 型号： | LT3022EMSE-1.2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.2V 1A 16-MSOP |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.2V |
| 输入电压： | 最高 10V |
| 电压 - 压降（标准）： | 0.145V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 电流 - 限制（最小）： | 1.1A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3022/LT3022-1.2
LT3022-1.5/LT3022-1.8
APPLICATIONS INFORMATION
The LT3022 very low dropout linear regulator is capable of
0.9V input supply operation. It supplies 1A output current
and dropout voltage is typically 145mV. Quiescent current
is typically 400μA and drops to 7.5μA in shutdown. The
LT3022 incorporates several protection features, making
it ideal for use in battery-powered systems. The device
protects itself against reverse-input and reverse-output
voltages. If the output is held up by a backup battery when
the input is pulled to ground in a battery backup application,
the LT3022 behaves as if a diode is in series with its output,
preventing reverse current flow. In dual supply applications
where the regulator load is returned to a negative supply,
pulling the output below ground by as much as 10V does
not affect start-up or normal operation.
Adjustable Operation
Table 1
V OUT (V)
0.9
1.0
1.2
1.5
1.8
2.5
3.3
+
V IN
R1 (Ω)
200
187
200
200
187
187
200
IN OUT
LT3022
SHDN ADJ
GND
R2
R1
3022 F01
R2 (Ω)
698
750
1000
1300
1500
2150
3090
V OUT
? 100 μV = 750 μV
TheLT3022’soutputvoltagerangeis0.2Vto9.5V.Figure1
shows that the external resistor ratio sets output voltage.
The device regulates the output to maintain ADJ at 200mV
referred to ground. R1’s current equals 200mV/R1. R2’s
current is R1’s current minus the ADJ pin bias current.
The 30nA ADJ pin bias current flows out of the pin. Use
Figure 1’s formula to calculate output voltage. Given the
LT3022’s 1mA minimum load current requirement, Linear
Technology recommends choosing resistor divider values
to satisfy this requirement. A 200Ω R1 value sets a 1mA
resistor divider current. In shutdown, the output is off and
the divider current is zero. Curves of ADJ Pin Voltage vs
Temperature and ADJ Pin Bias Current vs Temperature appear
in the Typical Performance Characteristics section.
Specifications for output voltages greater than 200mV
are proportional to the ratio of desired output voltage to
200mV (V OUT /200mV). For example, load regulation for
an output current change of 1mA to 1A is typically 100μV
at V ADJ = 200mV. At V OUT = 1.5V, load regulation is:
1 . 5 V
200 mV
Table 1 shows 1% resistor divider values for some common
output voltages with a resistor divider current equaling or
about 1mA.
V OUT : 200mV ? (1 + R2/R1) – (I ADJ ? R2)
V ADJ : 200mV
I ADJ : 30nA AT 25°C
OUTPUT RANGE: 0.2V TO 9.5V
Figure 1. Adjustable Operation
Output Capacitance and Transient Response
The LT3022’s design is stable with a wide range of output
capacitors, but is optimized for low ESR ceramic capacitors.
The output capacitor’s ESR affects stability, most notably
with small value capacitors. Use a minimum output
capacitor of 10μF with an ESR of less than 0.1Ω to prevent
oscillations. The LT3022 is a low voltage device and output
load transient response is a function of output capacitance.
Larger values of output capacitance decrease the peak
deviations and provide improved transient response for
large load current changes.
Ceramic capacitors require extra consideration. Manufac-
turers make ceramic capacitors with a variety of dielectrics;
each with a different behavior across temperature and
applied voltage. The most common dielectrics are Z5U,
Y5V, X5R and X7R. Z5U and Y5V dielectrics provide
high C-V products in a small package at low cost, but
exhibit strong voltage and temperature coefficients. X5R
and X7R dielectrics yield highly stable characteristics
3022fb
12
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相关代理商/技术参数 |
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|---|---|
| LT3022EMSEPBF | 制造商:Linear Technology 功能描述:LDO Regulator Adj. 1A 0.9-10V MSOP16EP |
| LT3022EMSE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A, 0.9V to 10V, Very Low Dropout Linear Regulator |
| LT3022EMSE-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A, 0.9V to 10V, Very Low Dropout Linear Regulator |
| LT3022EMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A, 0.9V to 10V, Very Low Dropout Linear Regulator |
| LT3022IDHC | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.2V to 9.5V 1A 16-Pin DFN EP |
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