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參數資料
| 型號： | MAX1734EUK18 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low-Voltage, Step-Down DC-DC Converters in SOT23 |
| 中文描述： | 0.565 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數： | 7/8頁 |
| 文件大?。?/td> | 265K |
| 代理商： | MAX1734EUK18 |
GND (Figure 1). Choose R2 to be less than 50k
:
where V
REF
= 1.25V.
Inductor Selection
The MAX1733/MAX1734 are optimized to use a 10μH
inductor over the entire operating range. A 300mA
rated inductor is enough to prevent saturation for out-
put currents up to 250mA. Saturation occurs when the
inductor
’
s magnetic flux density reaches the maximum
level the core can support and inductance falls.
Choose a low DC-resistance inductor to improve effi-
ciency. Tables 1 and 3 list some suggested inductors
and suppliers.
Capacitor Selection
The MAX1733/MAX1734 require output voltage ripple
(approximately 30mVp-p) for stable switching behavior.
Use a 10μF to 47μF tantalum output capacitor with
about 200m
to 300m
ESR to provide stable switch-
ing while minimizing output ripple. Choose input and
output capacitors to filter inductor currents for accept-
able voltage ripple. The input capacitor reduces peak
currents and noise at the voltage source. Input capaci-
tors must meet the input ripple requirements and volt-
age rating. Use the following equation to calculate the
maximum RMS input current:
Tables 2 and 3 list some suggested capacitors and
suppliers.
Using Ceramic C
OUT
with MAX1733
The circuit of Figure 3 is designed to allow the use of
ceramic output capacitors with the MAX1733.
Feedback is derived from the LX pin instead of the out-
put to remove the effects of phase lag in the feedback
loop. Compared to the standard applications circuit,
there are three benefits: 1) availability of ceramic vs.
tantalum; 2) size of 2.2μF 0805 vs. 22μF A-case; 3) out-
put ripple less than 10mVp-p vs. greater than 30mVp-p.
Increase the output capacitance to 4.7μF to further
reduce the output ripple. Note that this circuit exhibits
load regulation equal to the series resistance of the
inductor multiplied by the load current. This small
amount of load regulation is helpful in reducing over-
shoot of the output voltage during load transients.
I
I
V
V
OUT
V
OUT
OUT
IN
IN
=
(
)
1 2
/
R
R
V
V
OUT
REF
1
2
1
=
×
M
Low-Voltage, Step-Down DC-DC Converters
in SOT23
_______________________________________________________________________________________
7
INDUCTOR VALUE
(μH)
MANUFACTURER
PART
NUMBER
CR43-100
CDRH4D18-100
DT1608C-103
10
Sumida
10
Coilcraft
Table 1. Suggested Inductors
Table 2. Suggested Capacitors
CAPACITOR
TYPE
MANUFACTURER
PART
NUMBER
Tantalum
(22μF)
Taiyo Yuden
LMK212BJ225MG
Ceramic
AVX
TAJA226M006R
Table 3. Component Suppliers
COMPANY
AVX
Coilcraft
Kemet
Murata
PHONE
843-946-0238
847-639-6400
408-986-0424
814-237-1431
847-956-0666
81-3-3607-5111
408-573-4150
FAX
843-626-3123
847-639-1469
408-986-1442
814-238-0490
847-956-0702
81-3-3607-5144
408-573-4159
USA
Japan
Sumida
Taiyo Yuden
FB
30k
1000pF
68k
2.2
μ
F
X7R
OUTPUT
1.8V at 250mA
10
μ
H
LX
IN
MAX1733
SHDN
OFF
ON
2.2
μ
F
X7R
GND
Li+
2.7V TO 4.2V
Figure 3. Using a Ceramic Output Capacitor with the MAX1733
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1734EUK__-T | Low-Voltage, Step-Down DC-DC Converters in SOT23 |
| MAX1733 | Replaced by TMS320VC5506 : |
| MAX1733EUK | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0 |
| MAX1749EUK-T | CONN, 50-PIN, ZIF, 0.5MM, PITCH SMD |
| MAX1749 | SOT23 Vibrator Motor Driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1734EUK18+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP DOWN 5PIN SOT-23 - Bulk |
| MAX1734EUK18+T | 功能描述:直流/直流開關轉換器 Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1734EUK18-T | 功能描述:直流/直流開關轉換器 Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1734EVKIT | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1735EUK25 | 制造商:Maxim Integrated Products 功能描述:LOW-DROPOUT LINEAR REGULATOR IN SOT 23 - Cut Tape Product |
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