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参数资料
| 型号： | MAX5067ETH+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/32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
directly at the load provides accurate load voltage
sensing in high-current environments. The VEA pro-
vides the difference between the differential amplifier
output (DIFF) and the desired output voltage. The dif-
ferential amplifier has a bandwidth of 3MHz. The differ-
ence between SENSE+ and SENSE- regulates to +0.6V
for the MAX5065 and regulates to +0.8V for the
MAX5067. Connect SENSE+ to the center of the resis-
tive-divider from the output to SENSE-.
(Figures 1, 2). V REF = 0.6V (MAX5065) or 0.8V
(MAX5067).
Some applications require V OUT equal to V OUT(NOM) at
no load. To ensure that the output voltage does not
exceed the nominal output voltage (V OUT(NOM) ), add a
resistor R X from V CC to EAN.
Use the following equations to calculate the value of R X .
For MAX5065:
Voltage-Error Amplifier
The VEA sets the gain of the voltage control loop and
determines the error between the differential amplifier
output and the internal reference voltage (V REF ).
The VEA output clamps to +0.9V relative to V CM
(+0.6V), thus limiting the average maximum current
from individual phases. The maximum average current-
For MAX5067:
R X = [ V CC ? 1 . 2 ] ×
R X = [ V CC ? 1 . 4 ] ×
R F
0 . 6 V
R F
0 . 8 V
(4)
(5)
limit threshold for each phase is equal to the maximum
clamp voltage of the VEA divided by the gain (18) of
the current-sense amplifier. This results in accurate set-
tings for the average maximum current for each phase.
Set the VEA gain using R F and R IN for the amount of
output voltage positioning required within the rated cur-
rent range as discussed in the Adaptive Voltage
Positioning section (Figure 4).
Adaptive Voltage Positioning
Powering new-generation processors requires new
techniques to reduce cost, size, and power dissipation.
Voltage positioning reduces the total number of output
capacitors to meet a given transient response require-
ment. Setting the no-load output voltage slightly higher
than the output voltage during nominally loaded condi-
tions allows a larger downward voltage excursion when
V OUT ( NL ) = ? 1 + IN ? × ? H L ? × V REF
? R ? ? R + R ?
? R F ? ? R L ?
(3)
the output current suddenly increases. Regulating at a
lower output voltage under a heavy load allows a larger
upward-voltage excursion when the output current sud-
denly decreases. A larger allowed, voltage-step excur-
where R H and R L are the feedback resistor network
sion reduces the required number of output capacitors
DRV_V CC
PEAK-CURRENT
COMPARATOR
112mV
CLP_
CSP_
A V = 18
CSN_
GM IN
G m =
500 μ S
PWM
COMPARATOR
BST_
RAMP
2 x f s (V/s)
S
Q
DH_
LX_
CLK
SHDN
R
Q
DL_
PGND
Figure 5. Phase Circuit (Phase 1/Phase 2)
______________________________________________________________________________________
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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