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| 型号： | MAX5066EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX5066 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 0.8V，1.3V |
| 电流 - 输出： | 10A，10A |
| 输入电压： | 5 ~ 16 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX5066 |
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
Finally, a thermal-shutdown feature protects the device
during thermal faults and shuts down the MAX5066
when the die temperature exceeds +160°C.
Dual-Output/Dual-Phase Select (MODE)
The MAX5066 can operate as a dual-output indepen-
dently regulated buck converter, or as a dual-phase,
single-output buck converter. The MODE input selects
between the two operating modes. When MODE is
grounded (logic low), VEA1 and VEA2 connect to CEA1
and CEA2, respectively (see Figure 1 ) and the device
operates as a two-output DC-DC converter. When
MODE is connected to REG (logic high), VEA2 is dis-
connected and VEA1 is routed to both CEA1 and CEA2
and the device works as a dual-phase, single-output
buck regulator with each output 180° out of phase with
respect to each other.
Supply Voltage Connections (V IN /V REG )
The MAX5066 accepts a wide input voltage range at IN
of 5V to 28V. An internal linear regulator steps down V IN
to 5.1V (typ) and provides power to the MAX5066. The
output of this regulator is available at REG. For V IN =
4.75V to 5.5V, connect IN and REG together externally.
REG can supply up to 65mA for external loads. Bypass
REG to AGND with a 4.7μF ceramic capacitor for high-
frequency noise rejection and stable operation.
REG supplies the current for both the MAX5066’s inter-
nal circuitry and for the MOSFET gate drivers (when
connected externally to V DD ), and can source up to
65mA. Calculate the maximum bias current (I BIAS ) for
the MAX5066:
I BIAS = I IN + f SW × ( Q GQ 1 + Q GQ 2 + Q GQ 3 + Q GQ 4 )
where I IN is the quiescent supply current into IN (4mA,
typ), Q GQ1 , Q GQ2 , Q GQ3 , Q GQ4 are the total gate
charges of MOSFETs Q1 through Q4 at V GS = 5V (see
Figure 6 ), and f SW is the switching frequency of each
individual phase.
diodes D1 and D2 (see Figure 6). Connect a 0.1μF
ceramic capacitor between BST_ and LX_.
Minimize the trace inductance from BST_ and V DD to
rectifier diodes, D1 and D2, and from BST_ and LX_ to
the boost capacitors, C8 and C9 (see Figure 6). This is
accomplished by using short, wide trace lengths.
Undervoltage Lockout (UVLO)/
Power-On Reset (POR)/Soft-Start
The MAX5066 includes an undervoltage lockout
(UVLO) with hysteresis, and a power-on reset circuit for
converter turn-on and monotonic rise of the output volt-
age. The UVLO threshold monitors V REG and is inter-
nally set between 4.0V and 4.5V with 200mV of
hysteresis. Hysteresis eliminates “chattering” during
startup. Most of the internal circuitry, including the
oscillator, turns on when V REG reaches 4.5V. The
MAX5066 draws up to 4mA (typ) of current before
V REG reaches the UVLO threshold.
The compensation network at the current-error ampli-
fiers (CLP1 and CLP2) provides an inherent soft-start of
the output voltage. It includes (R14 and C10) in parallel
with C11 at CLP1 and (R15 and C12) in parallel with
C13 at CLP2 (see Figure 6) . The voltage at the current-
error amplifier output limits the maximum current avail-
able to charge the output capacitors. The capacitor at
CLP_ in conjunction with the finite output-drive current
of the current-error amplifier yields a finite rise time for
the output current and thus the output voltage.
Setting the Switching Frequency (f SW )
An internal oscillator generates the 180 o out-of-phase
clock signals required for both PWM modulators. The
oscillator also generates the 2V P-P voltage ramps nec-
essary for the PWM comparators. The oscillator fre-
quency can be set from 200kHz to 2MHz by an external
resistor (R T ) connected from RT/CLKIN to AGND (see
Figure 6). The equation below shows the relationship
between R T and the switching frequency:
Low-Side MOSFET Driver Supply (V DD )
V DD is the power input for the low-side MOSFET dri-
vers. Connect the regulator output REG externally to
f OSC =
2 . 5 × 10 10
R RT
Hz
V DD through an R-C lowpass filter. Use a 1 ? resistor
and a parallel combination of 1μF and 0.1μF ceramic
capacitors to filter out the high peak currents of the
MOSFET drivers from the sensitive internal circuitry.
High-Side MOSFET Drive Supply (BST_)
BST1 and BST2 supply the power for the high-side
MOSFET drivers for output 1 and output 2, respectively.
Connect BST1 and BST2 to V DD through rectifier
where R RT is in ohms and f SW(PER PHASE) = f OSC /2.
Use RT/CLKIN as a clock input to synchronize the
MAX5066 to an external frequency (f RT/CLKIN ). Applying
an external clock to RT/CLKIN allows each PWM section
to work at a frequency equal to f RT/CLKIN /2. An internal
comparator with a 1.6V threshold detects f RT/CLKIN . If
f RT/CLKIN is present, internal logic switches from the
internal oscillator clock, to the clock present at
RT/CLKIN.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5067 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Phase, +0.6V to +3.3V Output Parallelable, Average-Current-Mode Controllers |
| MAX5067ETH | 功能描述:电流型 PWM 控制器 Dual-Phase .6-3.3V Parallelable Average 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 |
| MAX5067ETH+ | 功能描述:电流型 PWM 控制器 Dual-Phase .6-3.3V Parallelable Average 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 |
| MAX5067ETH+T | 功能描述:电流型 PWM 控制器 Dual-Phase .6-3.3V Parallelable Average 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 |
| MAX5067ETH-T | 功能描述:电流型 PWM 控制器 Dual-Phase .6-3.3V Parallelable Average 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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