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参数资料
| 型号： | MAX15016BATX+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 19/26页 |
| 文件大小： | 0K |
| 描述： | IC REG DL BCK/LINEAR 36TQFNEP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 车载 |
| 输出数： | 2 |
| 频率 - 开关： | 135kHz |
| 电压/电流 - 输出 1： | 1.26 V ~ 32 V，1A |
| 电压/电流 - 输出 2： | 5 V ~ 40 V，50mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 4.5 V ~ 40 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 管件 |
1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
The following equations define the power modulator:
C8
G MOD _ DC =
V IN
V RAMP
= 10
R5
C7
f LC =
1
2 × π × L × C OUT
C6
R3
R6
f ZESR =
1
2 × π × C OUT × ESR
V OUT
R4
EA
COMP
The switching frequency is internally set at 500kHz for
MAX15015/MAX15017 and can vary from 400kHz to
600kHz when driven with an external SYNC signal. The
REF
switching frequency is internally set at 135kHz for
MAX15014/MAX15016 and can vary from 100kHz to
200kHz when driven with an external sync signal. The
crossover frequency (fC), which is the frequency when
GAIN
(dB)
CLOSED-LOOP
GAIN
EA
GAIN
the closed-loop gain is equal to unity, should be set to
around 1/10 of the switching frequency or below.
The crossover frequency occurs above the LC double-
pole frequency, and the error amplifier must provide a
gain and phase bump to compensate for the rapid gain
f Z1 f Z2
f C
f P2 f P3
FREQUENCY
and phase loss from the LC double pole, which exhibits
little damping.
This is accomplished by utilizing a Type 3 compensator
that introduces two zeroes and three poles into the con-
trol loop. The error amplifier has a low-frequency pole
(f P1 ) near the origin so that tight voltage regulation at DC
can be achieved.
The two zeroes are at:
Figure 3. Error Amplifier Compensation Circuit (Closed-Loop
and Error-Amplifier Gain Plot) for Ceramic Capacitors
value and tend to be more expensive. Aluminum elec-
trolytic capacitors have much larger ESR but can reach
much larger capacitance values.
Compensation when f C < f ZESR
and
f ZI =
1
2 π × R 5 × C 7
This is usually the case when a ceramic capacitor is
selected. In this case, f ZESR occurs after f C . Figure 3
shows the error amplifier feedback as well as its gain
response.
f Z2 =
1
2 π × ( R 3 + R 6 ) × C 6
f Z1 is set to 0.5 to 0.8 x f LC and f Z2 is set to f LC to com-
pensate for the gain and phase loss due to the double
pole. To achieve a 0dB crossover with -20dB/decade
and the higher frequency poles are at:
slope, poles f P2 and f P3 are set above the crossover fre-
f P2 =
1
2 π × R 6 × C 6
quency f C .
The values for R3 and R4 are already determined in the
Setting the Output Voltage section. The value of R3 is
and
f P3 =
1
C7 × C 8
2 π × R 5 ×
C 7 + C 8
also used in the following calculations.
Since f Z2 < f C < f P2 , then R3 >> R6, and R3 + R6 can
be approximated as R3.
Now we can calculate C6 for zero f Z2 :
The compensation design primarily depends on the
type of output capacitor. Ceramic capacitors exhibit
very low ESR, and are well suited for high-switching-
frequency applications, but are limited in capacitance
C 6 =
1
2 π × f LC × R 3
______________________________________________________________________________________
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15016BATX+ | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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 |
| MAX15016BATX+T | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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 |
| MAX15017AATX+ | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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 |
| MAX15017AATX+T | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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 |
| MAX15017BATX+ | 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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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