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参数资料
| 型号： | MAX1734EUK18+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 250mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-5 |
Low-Voltage, Step-Down DC-DC Converters
in SOT23
Table 1. Suggested Inductors
Table 3. Component Suppliers
INDUCTOR VALUE
(μH)
10
10
MANUFACTURER
Sumida
Coilcraft
PART
NUMBER
CR43-100
CDRH4D18-100
DT1608C-103
COMPANY
AVX
Coilcraft
Kemet
Murata
PHONE
843-946-0238
847-639-6400
408-986-0424
814-237-1431
FAX
843-626-3123
847-639-1469
408-986-1442
814-238-0490
Table 2. Suggested Capacitors
CAPACITOR
MANUFACTURER
TYPE
PART
NUMBER
USA
Sumida
Japan
Taiyo Yuden
847-956-0666
81-3-3607-5111
408-573-4150
847-956-0702
81-3-3607-5144
408-573-4159
( )
I OUT ? V OUT V IN ? OUT ? 1 / 2
?? ??
Tantalum
(22μF)
Ceramic
(2.2μF)
Taiyo Yuden
AVX
LMK212BJ225MG
TAJA226M006R
I RMS =
V IN
Tables 2 and 3 list some suggested capacitors and
suppliers.
R 1 = R 2 × ? OUT ? 1 ?
GND (Figure 1). Choose R2 to be less than 50k?:
? V ?
? V REF ?
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
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.
and suppliers.
10 μ H
OUTPUT
1.8V at 250mA
Capacitor Selection
IN
LX
The MAX1733/MAX1734 require output voltage ripple
(approximately 30mVp-p) for stable switching behavior.
Li+
2.7V TO 4.2V
2.2 μ F
X7R
MAX1733
30k
2.2 μ F
X7R
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
GND
1000pF
output capacitors to filter inductor currents for accept-
ON
OFF
SHDN
FB
able voltage ripple. The input capacitor reduces peak
currents and noise at the voltage source. Input capaci-
68k
tors must meet the input ripple requirements and volt-
age rating. Use the following equation to calculate the
maximum RMS input current:
Figure 3. Using a Ceramic Output Capacitor with the MAX1733
_______________________________________________________________________________________
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