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| 型号： | MAX5026EUT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 40MA SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 3 V ~ 36 V |
| 输入电压： | 3 V ~ 11 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 40mA |
| 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： | 标准包装 |
| 供应商设备封装： | SOT-6 |
| 产品目录页面： | 1411 (CN2011-ZH PDF) |
| 其它名称： | MAX5026EUT+TDKR |
500kHz, 36V Output, SOT23,
Step-Up DC-DC Converters
For a design in which V IN = 5V, V OUT = 30V, I OUT =
4mA, η = 0.5, and T S = 2μs,
L UPPER = 87μH
and
L LOWER = 12μH.
For a worst-case scenario in which V IN = 4.75V, V OUT
= 29V, I OUT = 4.4mA, η = 0.5, and T S = 1.25μs,
L UPPER = 46μH
and
L LOWER = 9μH.
The choice of 47μH as the recommended inductance
value is reasonable given the worst-case scenario
above. In general, the higher the inductance, the lower
the switching noise. Load regulation is also better with
higher inductance.
Diode Selection
The MAX5025–MAX5028’s high switching frequency
demands a high-speed rectifier. Schottky diodes are
recommended for most applications because of their
fast recovery time and low forward-voltage drop.
Ensure that the diode’s peak current rating is greater
than or equal to the peak inductor current. Also, the
diode reverse breakdown voltage must be greater than
V OUT . Table 2 lists diode vendors.
Capacitor Selection
Output Filter Capacitor
The output filter capacitor should be 1μF or greater. To
achieve low output ripple, a capacitor with low ESR, low
ESL, and high capacitance value should be selected.
For very low output ripple applications, the output of the
boost converter can be followed by an RC filter to fur-
ther reduce the ripple. Figure 3 shows a 100 Ω , 1μF fil-
ter used to reduce the switching output ripple to
1mVp-p.
X7R ceramic capacitors are better for this boost appli-
cation because of their low ESR and tighter tolerance
over temperature than the Y5V ceramic capacitors.
Table 3 below lists manufacturers of recommended
capacitors.
Input Capacitor
Bypass V CC with a 4.7μF ceramic capacitor as close to
the IC as is practical.
Applications Information
Layout Considerations
The MAX5025–MAX5028 switch at high speed, man-
dating careful attention to layout for optimum perfor-
mance. Protect sensitive analog grounds by using a
star ground configuration. Minimize ground noise by
connecting GND, PGND, the input bypass-capacitor
ground lead, and the output-filter ground lead to a sin-
gle point (star ground configuration). Also, minimize
Table 2. Schottky Diode Vendors
VENDOR
Comchip
Panasonic
ST-Microelectronics
Vishay-Telefunken
Zetex
PHONE
510-657-8671
408-942-2912
602-485-6100
402-563-6866
631-360-2222
FAX
510-657-8921
408-946-9063
602-486-6102
402-563-6296
631-360-8222
PART NUMBERS
CDBS1045
MA2Z785
TMMBAT48
BAS382
ZHCS500
Table 3. Capacitor Table
COMPANY
Murata
Taiyo Yuden
TDK
PHONE
814-237-1431
408-573-4150
847-803-6100
FAX
814-238-0490
408-573-4159
847-803-6296
PART NUMBERS
GRM42-2X7R105K050AD (1μF capacitor)
GRM32-1210R71C475R (4.7μF capacitor)
UMK325BJ105KH (1μF capacitor)
EMK316BJ475ML (4.7μF capacitor)
C3225X7R1H155K (1.5μF capacitor)
C3225X7R1H105K (1μF capacitor)
10
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