- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384654 > MAX1896 (Maxim Integrated Products, Inc.) 1.4MHz SOT23 Current-Mode Step-Up DC-DC Converter PDF資料下載
參數(shù)資料
| 型號： | MAX1896 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1.4MHz SOT23 Current-Mode Step-Up DC-DC Converter |
| 中文描述： | 1.4MHz、SOT23封裝、電流模式升壓型DC-DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 755K |
| 代理商： | MAX1896 |
The inductance (H) value is then given by:
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
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:
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).
Setting the Output Voltage
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:
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:
where:
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)
V
IN
= minimum input voltage, (V)
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:
t
ss
= k
3
C
SS
where:
k
3
= 6.67
10
5
C
k
x C
x
V
x I
V
x V
V
I
x V
SS
OUT
OUT
INRUSH
IN
OUT
IN
OUT
OUT
>
2
2
R
R
x
V
V
OUT
FB
1
2
1
=
k
x
withunits of
x F
A
1
7 14
10
4
0 5
.
=
C
k
R
x
C
x V
V
IN
FF
OUT
OUT
.
=
1
1
2
0 5
L
V
x
V
V
x LIR x I
x f
IN MIN
(
OUT
IN MIN
(
OUT
OUT MAX
(
OSC
[
x V
)]
)
)
)
=
2
2
M
1.4MHz SOT23 Current-Mode
Step-Up DC-DC Converter
_______________________________________________________________________________________
7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1896EUT-T | Fixed-Point Digital Signal Processor 532-FCBGA |
| MAX1898 | Fixed-Point Digital Signal Processor 532-FCBGA |
| MAX1898EUB41 | Linear Charger for Single-Cell Li Battery |
| MAX1898EUB42 | Linear Charger for Single-Cell Li Battery |
| MAX1910EUB | 6 Pin, DIP, Phototransistor Detector w/o Base, CTR 100-200 @ 10mA, 5V Optocoupler |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1896EUT | 制造商:Maxim Integrated Products 功能描述:1.4MHZ SOT23 CURRENT-MODE STEP-UP D - Cut Tape Product |
| MAX1896EUT#G16 | 制造商:Maxim Integrated Products 功能描述:1.4MHZ SOT23 CURRENT-MODE STEP-UP DC-DC CONVERTER - Rail/Tube |
| MAX1896EUT#TG16 | 功能描述:電流型 PWM 控制器 1.4MHz Current-Mode Step-Up RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MAX1896EUT+ | 制造商:Maxim Integrated Products 功能描述:1.4MHZ SOT23 CURRENT-MODE STEP-UP DC-DC CONVERTER - Rail/Tube |
| MAX1896EUT+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.4MHz Current-Mode Step-Up RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
發(fā)布緊急采購，3分鐘左右您將得到回復。