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参数资料
| 型号： | MAX15046BAEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.1MHz |
| 占空比： | 87.5% |
| 电源电压： | 4.5 V ~ 40 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-LSSOP（0.154"，3.90mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX15046
40V, High-Performance, Synchronous
Buck Controller
< D max - max DROP2 max DROP1
? ? V OUT ? ?
MAX15046 stops both DL and DH drivers and waits for
4096 switching cycles (hiccup timeout delay) before
attempting a new soft-start sequence. The hiccup-mode
protection remains active during the soft-start time.
Undervoltage Lockout
The MAX15046 provides an internal undervoltage lock-
out (UVLO) circuit to monitor the voltage on V CC . The
UVLO circuit prevents the MAX15046 from operating
when V CC is lower than V UVLO . The UVLO threshold is
4V, with 400mV hysteresis to prevent chattering on the
rising/falling edge of the supply voltage. DL and DH stay
low to inhibit switching when the device is in undervolt-
age lockout.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX15046. When the junction temperature of
the device exceeds +150 N C, an on-chip thermal sensor
shuts down the device, forcing DL and DH low, which
allows the device to cool. The thermal sensor turns the
device on again after the junction temperature cools by
20 N C. The regulator shuts down and soft-start resets
during thermal shutdown. Power dissipation in the LDO
regulator and excessive driving losses at DH/DL trigger
thermal-overload protection. Carefully evaluate the total
power dissipation (see the Power Dissipation section) to
avoid unwanted triggering of the thermal-overload pro-
tection in normal operation.
Applications Information
Effective Input-Voltage Range
The MAX15046 operates from 4.5V to 40V input supplies
and regulates output down to 0.6V. The minimum voltage
conversion ratio (V OUT /V IN ) is limited by the minimum
controllable on-time. For proper fixed-frequency PWM
operation, the voltage conversion ratio must obey the
following condition:
The maximum voltage conversion ratio is limited by the
maximum duty cycle (D max ):
V OUT D × V + (1-D ) × V
V IN V IN
where V DROP1 is the sum of the parasitic voltage drops
in the inductor discharge path, including synchronous
rectifier, inductor, and PCB resistance. V DROP2 is the
sum of the voltage drops by the resistance in the charg-
ing path, including high-side switch, inductor, and PCB
resistance. In practice, provide adequate margin to the
above conditions for good load-transient response.
Setting the Output Voltage
Set the MAX15046 output voltage by connecting a resis-
tive divider from the output to FB to GND (Figure 2).
Select R 2 from between 4k I and 16k I . Calculate R 1
with the following equation:
R 1 = R 2 ? ? ? -1 ?
? ? ? V FB ? ? ?
where V FB = 0.59V (see the Electrical Characteristics
table) and V OUT can range from 0.6V to (0.85 O V IN ).
Resistor R 1 also plays a role in the design of the Type
III compensation network. Review the values of R 1 and
R 2 when using a Type III compensation network (see the
Type III Compensation Network (Figure 4) section).
OUT
R 1
FB
V OUT
V IN
> t ON(MIN) × f SW
MAX15046
R 2
where t ON(MIN) is 125ns and f SW is the switching fre-
quency in Hertz. Pulse skipping occurs to decrease the
effective duty cycle when the desired voltage conversion
does not meet the above condition. Decrease the switch-
ing frequency or lower the input voltage V IN to avoid
pulse skipping.
Maxim Integrated
Figure 2. Adjustable Output Voltage
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15046BEEE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX15046BEVKIT+ | 功能描述:电源管理IC开发工具 MAX15046B Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX15046CAEE+ | 功能描述:DC/DC 开关控制器 40V Synch Buck 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 |
| MAX15046CAEE+T | 功能描述:DC/DC 开关控制器 40V Synch Buck 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 |
| MAX15046EEE+ | 功能描述:DC/DC 开关控制器 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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