参数资料
| 型号： | LTC3035EDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .3A 8-DFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.4 V ~ 3.6 V |
| 输入电压： | 1.7 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.045V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 带卷 (TR) |
LTC3035
APPLICATIO S I FOR ATIO
( )
V OUT = 0.4V 1 +
V OUT
R2
R2
R1
V OUT
20mV/DIV
AC
ADJ
R1
C OUT
GND
3035 F04
300mA
I OUT
0mA
Figure 4. Programming the LTC3035
V IN = 3.6V
200 μ s/DIV
3035 F02
current change of 1mA to 300mA produces a – 0.2mV
V OUT = 3.3V
C OUT = 1 μ F
Figure 2. Output Step Response
drop at the ADJ input. To calculate the change refered to
the output simply multiply by the gain of the feedback
network (i.e., 1 + R2/R1). For example, to program the
output for 3.3V choose R2/R1 = 7.25. In this example an
SHDN
ON
OFF
output current change of 1mA to 300mA produces
–0.2mV ? (1 + 7.25) = 1.65mV drop at the output.
V BIAS
2V/DIV
0V
V OUT
2V/DIV
0V
Output Capacitance and Transient Response
The LTC3035 is designed to be stable with a wide range of
ceramic output capacitors. The ESR of the output capaci-
tor affects stability, most notably with small capacitors. An
output capacitor of 1 μ F or greater with an ESR of 0.05 ? or
V IN = 3.6V
V OUT = 3.3V
C OUT = 1 μ F
C BIAS = 1 μ F
500 μ s/DIV
3035 F03
less is recommended to ensure stability. The LTC3035 is
a micropower device and output transient response will be
a function of output capacitance. Larger values of output
Figure 3. Bias and Output Start-Up Waveforms
Adjustable Output Voltage
The output voltage is set by the ratio of two external
resistors as shown in Figure 4. The device servos the
output to maintain the ADJ pin voltage at 0.4V (referenced
to ground). Thus the current in R1 is equal to 0.4V/R1. For
good transient response, stability and accuracy the
current in R1 should be at least 8 μ A, thus the value of R1
should be no greater than 50k. The current in R2 is the
current in R1 plus the ADJ pin bias current. Since the ADJ
pin bias current is typically <10nA it can be ignored in the
output voltage calculation. The output voltage can be
calculated using the formula in Figure 4. Note that in
shutdown the output is turned off and the divider current
will be zero once C OUT is discharged.
The LTC3035 operates at a relatively high gain of
–0.7 μ V/mA referred to the ADJ input. Thus a load
capacitance decrease the peak deviations and provide
improved transient response for larger load current
changes. Note that bypass capacitors used to decouple
individual components powered by the LTC3035 will
increase the effective output capacitor value. High ESR
tantalum and electrolytic capacitors may be used, but a
low ESR ceramic capacitor must be in parallel at the
output. There is no minimum ESR or maximum capacitor
size requirements.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
temperature and applied voltage. The most common di-
electrics used are Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances
in a small package, but exhibit strong voltage and tem-
perature coefficients as shown in Figures 5 and 6. When
used with a 3.3V regulator, a 1 μ F Y5V capacitor can lose
as much as 80% of its rated capacitance over the operating
3035f
7
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