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参数资料
| 型号： | MAX16974AUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V/ADJ 16TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1 V ~ 10 V |
| 输入电压： | 3.5 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 260kHz ~ 2.2MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
the voltage drop across the high-side MOSFET. Current-
mode control eliminates the double pole in the feedback
loop caused by the inductor and output capacitor result-
ing in a smaller phase shift and requiring less elaborate
error-amplifier compensation than voltage-mode control.
V OUT
R 1
A simple single-series resistor (R C ) and capacitor (C C )
are all that is required to have a stable, high-bandwidth
loop in applications where ceramic capacitors are
used for output filtering (Figure 5). For other types of
capacitors, due to the higher capacitance and ESR, the
R 2
V REF
g m
R C
C C
COMP
C F
frequency of the zero created by the capacitance and
ESR is lower than the desired closed-loop crossover fre-
f pdEA =
quency.Tostabilizeanonceramicoutputcapacitorloop,
add another compensation capacitor (C F ) from COMP to
GND to cancel this ESR zero.
The basic regulator loop is modeled as a power modulator,
output feedback divider, and an error amplifier. The power
modulator has a DC gain set by g mc O R LOAD , with a pole
and zero pair set by R LOAD , the output capacitor (C OUT ),
and its ESR. The following equations approximate the
value for the gain of the power modulator (GAIN MOD(DC) ),
neglecting the effect of the ramp stabilization. Ramp stabi-
lization is necessary when the duty cycle is above 50% and
is internally done for the device.
GAIN MOD(DC) = g mc × R LOAD
where R LOAD = V OUT /I LOUT(MAX) in I and g mc = 3S.
In a current-mode step-down converter, the output
capacitor, its ESR, and the load resistance introduce a
pole at the following frequency:
Figure 5. Compensation Network
The transconductance error amplifier has a DC gain of
GAIN EA(DC) = g m,EA O R OUT,EA , where g m,EA is the error
amplifier transconductance, which is 1000 F S (typ), and
R OUT,EA is the output resistance of the error amplifier 50M I .
A dominant pole (f dpEA ) is set by the compensation
capacitor (C C ) and the amplifier output resistance
(R OUT,EA ). A zero (f ZEA ) is set by the compensation
resistor (R C ) and the compensation capacitor (C C ).
There is an optional pole (f pEA ) set by C F and R C to
cancel the output capacitor ESR zero if it occurs near
the crossover frequency (f C , where the loop gain equals
1 (0dB)). Thus:
1
2 π × C C × (R OUT,EA + R C )
f pMOD =
1
2 π × C OUT × R LOAD
f zEA =
1
2 π × C C × R C
f zMOD =
f pEA =
f pMOD C ≤ SW
<< f
TheoutputcapacitoranditsESRalsointroduceazeroat:
1
2 π × ESR × C OUT
When C OUT is composed of “n” identical capacitors in
parallel, the resulting C OUT = n O C OUT(EACH) and ESR
= ESR (EACH) /n. Note that the capacitor zero for a paral-
lel combination of alike capacitors is the same as for an
individual capacitor.
The feedback voltage-divider has a gain of GAIN FB =
V FB /V OUT , where V FB is 1V (typ).
1
2 π × C F × R C
The loop-gain crossover frequency (f C ) should be set
below 1/5th of the switching frequency and much higher
than the power-modulator pole (f pMOD ):
f
5
16_ _ ______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX16974EVKIT+ | 功能描述:电源管理IC开发工具 MAX16974 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 |
| MAX16975AAEE/V+ | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down 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 |
| MAX16975AAEE/V+T | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down 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 |
| MAX16975AEE/V+ | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down 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 |
| MAX16975AEE/V+T | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down 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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