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| 型号： | MAX1708EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BST 3.3V/5V/ADJ 5A 16QSOP |
| 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： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，可调 |
| 输入电压： | 0.7 V ~ 5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 5A |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
MAX1708 IC Power Dissipation
The major components of MAX1708 dissipated power
ON/OFF
270k Ω
MAX1708
ONB
ONA
μ C
V DD
I/O
I/O
are switch conductance loss (P SW ), capacitive loss
(P CAP ), and switch transition loss (P TRAN ). Numerical
examples provided in brackets ({ }) correspond to the
following condition:
{V IN = 3.3V, V OUT = 5V, V D = 0.5V, I OUT = 2A}
An important parameter to compute the power dissipat-
ed in the MAX1708 is the approximate peak switch cur-
rent (I SW ):
I SW = OUT { 3 . 33 A }
0.1μF
270k Ω
I
D '
Figure 5. Momentary Pushbutton On-Off Switch
D ' =
V IN
V OUT + V D
{ 0 . 6 }
Diode Selection (D1)
The MAX1708’s high switching frequency demands a
high-speed rectifier. Use Schottky diodes (Table 3).
The diode’s current rating must exceed the maximum
load current, and its breakdown voltage must exceed
V OUT . The diode must be placed within 10mm of the
LX switching node and the output filter capacitor. The
diode also must be able to dissipate the power calcu-
lated by the following equation:
P DIODE = I OUT ? V D
where I OUT is the average load current and V D is the
diode forward voltage at the peak switch current.
Capacitor Selection
Input Bypass Capacitor (C1)
A 150μF, low-ESR input capacitor will reduce peak cur-
rents and reflected noise due to inductor current ripple.
Lower ESR allows for lower input ripple current, but
combined ESR values up to 100m Ω are acceptable.
Smaller ceramic capacitors may also be used for light
loads or in applications that can tolerate higher input
current ripple.
Output Filter Capacitor (C2)
The output filter capacitor ESR must be kept under
30m Ω for stable operation. Polymer capacitors of
150 μF (Panasonic EEFUE0J151R) typically exhibit
10m Ω of ESR. This translates to approximately 35mV of
output ripple at 3.5A switch current. Bypass the
MAX1708 IC supply input (OUT) with a 0.1μF ceramic
capacitor to GND and a 2 Ω series resistor (R2, as
shown in Figure 1).
P D = P SW + P CAP + P TRAN {0.472W}
P SW = (1 - D') I SW 2 ? R SW {0.353W}
P CAP = (C DIO + C DSW + C GSW ) (V OUT + V D ) 2 f {0.045W}
P TRAN = (V OUT + V D ) I SW ? t SW ? f / 3 {0.073W}
where:
R SW = switch resistance {80m Ω }
C DIO = catch-diode capacitance {500pF}
C DSW = switch drain capacitance {1250pF}
C GSW = switch gate capacitance {750pF}
f = switching frequency {600kHz}
t SW = switch turn-on or turn-off time {20ns}
Applications Information
Using a Momentary On/Off Switch
A momentary pushbutton switch can be used to turn
the MAX1708 on and off. As shown in Figure 5, when
ONA is pulled low and ONB is pulled high, the device
is off. When the momentary switch is pressed, ONB is
pulled low and the regulator turns on. The switch
should be on long enough for the microcontroller to exit
reset. The controller issues a logic high to ONA, which
guarantees that the device will stay on regardless of
the subsequent switch state. To turn the regulator off,
depress the switch long enough for the controller to
read the switch status and pull ONA low. When the
switch is released, ONB pulls high and the regulator
turns off.
12
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| MAX1708EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1708 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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| MAX17094AETM+ | 制造商:Maxim Integrated Products 功能描述:5GHZ 4-CHANNEL MIMO TRANSMITTER - Rail/Tube |
| MAX17094ETM+ | 功能描述:电流和电力监控器、调节器 Boost Regulator w/7Ch Driver RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX17094ETM+T | 功能描述:电流和电力监控器、调节器 Boost Regulator w/7Ch Driver RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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