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参数资料
| 型号： | MAX772CSA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 300kHz |
| 占空比： | 90% |
| 电源电压： | 3 V ~ 16.5 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
5V/12V/15V or Adjustable, High-Efficiency,
Low I Q , Step-Up DC-DC Controllers
Smaller capacitors are acceptable for light loads or in
applications that can tolerate higher output ripple.
Since the output filter capacitor’s ESR affects efficien-
V IN
cy, use low-ESR capacitors for best performance. The
smallest low-ESR surface-mount tantalum capacitors
currently available are the Sprague 595D series. Sanyo
R4
V+
R5
100k
OS-CON organic semiconductor through-hole capaci-
tors and the Nichicon PL series also exhibit low ESR.
See Table 2.
R3
LBI
MAX773
LBO
LOW-BATTERY
OUTPUT
( V TRIP -1 )
Input Bypass Capacitors
The input bypass capacitor (C1) reduces peak currents
drawn from the voltage source and also reduces noise
at the voltage source caused by the switching action of
the MAX770–MAX773. The input voltage source imped-
ance determines the size of the capacitor required at
the V+ input. As with the output filter capacitor, a low-
ESR capacitor is recommended. For output currents up
to 1A, 150μF (C1) is adequate, although smaller
bypass capacitors may also be acceptable.
Bypass the IC with a 0.1μF ceramic capacitor (C2)
placed close to the V+ and GND pins.
Reference Capacitor
Bypass REF with a 0.1μF capacitor (C3). REF can
source up to 100μA of current.
Setting the Low-Battery-Detector Voltage
To set the low-battery detector’s falling trip voltage
(V TRIP (falling)), select R3 between 10k ? and 500k ?
(Figure 9), and calculate R4 as follows:
GND
V
R4 = R3
REF
V REF = 1.5V
Figure 9. Input Voltage Monitor Circuit
__________Applications Information
MAX773 Operation with High
Input/Output Voltages
The MAX773’s shunt regulator input allows high volt-
ages to be converted to very high voltages. Since the
MAX773 runs off the 6V shunt (bootstrapped operation
is not allowed), the IC will not see the high input volt-
age. Use an external logic-level N-FET as the power
switch, since only 6V of V GS are available. Also, make
sure all external components are rated for very high
output voltage. Figure 3e shows a circuit that converts
28V to 100V.
( ——— V ———— )
R4 = (R3)
V TRIP -V REF
REF
Low Input Voltage Operation
When using a power supply that decays with time
where V REF = 1.5V.
The rising trip voltage is higher because of the com-
parator ’s approximately 20mV of hysteresis, and is
determined by:
R4
V TRIP (rising) = (V REF + 20mV) (1 + ——)
R3
Connect a high value resistor (larger than R3 + R4)
between LBI and LBO if additional hysteresis is required.
Connect a pull-up resistor (e.g., 100k ? ) between LBO
and V+. Tie LBI to GND and leave LBO floating if the
low-battery detector is not used.
(such as a battery), the N-FET transistor will operate in
its linear region when the voltage at EXT approaches
the threshold voltage of the FET, dissipating excessive
power. Prolonged operation in this mode may damage
the FET. This effect is much more significant in non-
bootstrapped mode than in bootstrapped mode, since
bootstrapped mode typically provides much higher
V GS voltages. To avoid this condition, make sure V EXT
is above the V TH of the FET, or use a voltage detector
(such as the MAX8211) to put the IC in shutdown mode
once the input supply voltage falls below a predeter-
mined minimum value. Excessive loads with low input
voltages can also cause this condition.
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX772CSA+ | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX772CSA+T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX772CSA-T | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX772EPA | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX772ESA | 功能描述:DC/DC 开关控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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