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| 型号： | MAX1896EUT#TG16 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.5A SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.6 V ~ 13 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz ~ 1.8MHz |
| 电流 - 输出： | 500mA |
| 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： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-6 |
1.4MHz SOT23 Current-Mode
Step-Up DC-DC Converter
The inductance (H) value is then given by:
Setting the Output Voltage
V OUT
x LIR x I OUT ( MAX ) x f OSC
L =
[V IN(MIN) 2 x η x (V OUT ? V IN(MIN) )]
2
The MAX1896 operates with an adjustable output from
V IN to 13V. Connect a resistive voltage-divider from the
output to FB (see Typical Operating Circuit ). Choose a
value for R2 between 10k ? and 50k ? . Calculate R1
using the equation:
R 1 = R 2 x ? OUT
? 1 ?
Diode Selection
The output diode should be rated to handle the output
voltage and the peak switch current. Make sure the
diode’s peak current rating is at least I PK and that its
? V
? V FB
?
?
breakdown voltage exceeds V OUT. Schottky diodes are
recommended. If a junction rectifier is used, it must be
an ultra-fast type (t rr < 50ns) to prevent excessive loss
in the rectifier.
Input and Output Capacitor Selection
The MAX1896 operates with both tantalum and ceramic
output capacitors. When using tantalum capacitors, the
zero caused by the ESR of the tantalum is used to
ensure stability. When using ceramic capacitors, the
zero due to the ESR will be at too high a frequency to
be useful in stabilizing the control loop. When using
ceramic capacitors, use a feedforward capacitor to
increase the phase margin, improving the control-loop
stability. Figure 3 shows the circuit with ceramic capac-
itors and the feedforward capacitor, C FF . Use the fol-
lowing equation to determine the value of the
feedforward capacitor:
where V FB , the step-up regulator feedback set point, is
1.24V. Connect the resistive-divider as close to the IC
as possible.
Soft-Start Capacitor
The soft-start capacitor should be large enough that the
current limit does not reach final value before the output
has reached regulation. Calculate C SS to be:
C SS > k 2 x C OUT x
? V OUT 2 ? V IN x V OUT ?
? ?
? ? V IN x I INRUSH ? I OUT x V OUT ? ?
where:
? ?
? ?
C FF =
k 1
R 1
? C x V 2 ?
x ? OUT OUT ?
V IN
0 . 5
k 2 = 21 x 10 -6 , (S)
V OUT = maximum output voltage, (V)
I INRUSH = peak inrush current allowed, (A)
I OUT = maximum output current during power-up stage, (A)
where:
V IN = minimum input voltage, (V)
k 1 = 7 . 14 x 10 ? 4 with units of ?
?
?
?
? ? x F ?
A
0 . 5
The soft-start duration (t SS ) is the time it takes the cur-
rent limit to reach its final value. The soft-start duration
can be calculated by the equation:
R1 = see Figure 3, ( ? )
C OUT = total output capacitance including any bypass
capacitor on the output bus, (Farads). See Figure 3.
V OUT = output voltage, (V)
V IN = input voltage, (V).
where:
t ss = k 3 ? C SS
k 3 = 6.67 ? 10 5 ?
_______________________________________________________________________________________
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