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| 型号： | MAX5067ETH+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 44-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 90% |
| 电源电压： | 4.75 V ~ 28 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 ~ 85°C |
| 封装/外壳： | 44-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual-Phase, +0.6V to +3.3V Output Parallelable,
Average-Current-Mode Controllers
Phase-Failure Detector (MAX5067)
Output current contributions from the two phases are
within ±10% of each other. Proper current sharing
reduces the necessity to overcompensate the external
components. However, an undetected failure of one
phase driver causes the other phase driver to run con-
tinuously as it tries to provide the entire current require-
ment to the load. Eventually, the stressed operational
phase driver fails.
During normal operating conditions, the voltage level
on CLP_ is within the peak-to-peak voltage levels of the
PWM ramp. If one of the phases fails, the control loop
raises the CLP_ voltage above its operating range. To
determine a phase failure, the phase-failure detection
circuit (Figure 8) monitors the output of the current
amplifiers (CLP1 and CLP2) and compares them to a
2.0V reference. If the voltage levels on CLP1 or CLP2
are above the reference level for more than 1250 clock
cycles, the phase failure circuit forces PGOOD low.
Parallel Operation
For applications requiring large output current, parallel
up to three MAX5065/MAX5067s (six phases) to triple
the available output current (see Figures 9 and 10). The
paralleled converters operate at the same switching fre-
quency but different phases keep the capacitor ripple
RMS currents to a minimum. Three parallel MAX5065/
MAX5067 converters deliver up to 180A of output cur-
rent. To set the phase shift of the on-board PLL, leave
PHASE unconnected for 90 ° of phase shift (2 paralleled
converters), or connect PHASE to SGND for 60 ° of phase
shift (3 converters in parallel). Designate one converter
as master and the remaining converters as slaves.
Connect the master and slave controllers in a daisy-
chain configuration as shown in Figure 9. Connect CLK-
OUT from the master controller to CLKIN of the first
slaved controller, and CLKOUT from the first slaved con-
troller to CLKIN of the second slaved controller. Choose
the appropriate phase shift for minimum ripple currents
at the input and output capacitors. The master controller
senses the output differential voltage through SENSE+
and SENSE- and generates the DIFF voltage. Disable the
voltage sensing of the slaved controllers by leaving DIFF
unconnected (floating). Figure 10 shows a detailed typi-
cal parallel application circuit using two MAX5067s. This
circuit provides four phases at an input voltage of +12V
and an output voltage range of +0.6V to +3.3V
(MAX5065) and +0.8V to +3.3V (MAX5067) at 104A.
Applications Information
Each MAX5065/MAX5067 circuit drives two 180 ° out-of-
phase channels. Parallel two or three MAX5065/
MAX5067 circuits to achieve four- or six-phase opera-
tion, respectively. Figure 1 shows the typical application
circuit for a two-phase operation. The design criteria for
a two-phase converter includes frequency selection,
inductor value, input/output capacitance, switching
MOSFETs, sense resistors, and the compensation net-
work. Follow the same procedure for the four- and six-
phase converter design, except for the input and output
capacitance. The input and output capacitance require-
ments vary depending on the operating duty cycle.
The examples discussed in this data sheet pertain to a
typical application with the following specifications:
V IN = +12V
V OUT = +1.8V
I OUT(MAX) = 52A
f SW = 250kHz
Peak-to-Peak Inductor Current ( ? I L ) = 10A
Table 1 shows a list of recommended external compo-
nents (Figure 1) and Table 2 provides component sup-
plier information.
Number of Phases
Selecting the number of phases for a voltage regulator
depends mainly on the ratio of input-to-output voltage
(operating duty cycle). Optimum output-ripple cancella-
tion depends on the right combination of operating duty
cycle and the number of phases. Use the following
equation as a starting point to choose the number of
phases:
N PH ≈ K/D (9)
where K = 1, 2, or 3 and the duty cycle is D = V OUT /V IN.
Choose K to make N PH an integer number. For exam-
ple, converting V IN = +12V to V OUT = +1.8V yields
better ripple cancellation in the six-phase converter
than in the four-phase converter. Ensure that the output
load justifies the greater number of components for
multiphase conversion. Generally limiting the maximum
output current to 25A per phase yields the most cost-
effective solution. The maximum ripple cancellation
occurs when N PH = K/D.
Single-phase conversion requires greater size and power
dissipation for external components such as the switch-
ing MOSFETs and the inductor. Multiphase conversion
eliminates the heatsink by distributing the power dissipa-
tion in the external components. The multiple phases
operating at given phase shifts effectively increase the
switching frequency seen by the input/output capacitors,
thereby reducing the input/output capacitance require-
ment for the same ripple performance. The lower induc-
tance value improves the large-signal response of the
converter during a transient load at the output. Consider
24
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| MAX5068 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator |
| MAX5068AAUE | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5068AAUE+ | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5068AAUE+T | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX5068AAUE-T | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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