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| 型号： | MAX1716EEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 100% |
| 电源电压： | 2 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： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
VOLTAGE POSITIONING THE OUTPUT
MAX1716-Figure 07
CAPACITOR SOAR
(ENERGY IN L
TRANSFERRED TO C OUT )
1.6V
1.6V
A. CONVENTIONAL CONVERTER (50mV/div)
B. VOLTAGE POSITIONED OUTPUT (50mV/div)
A
B
V OUT
CAPACITIVE SAG
(dV/dt = I OUT /C OUT )
I LOAD
ESR STEP-DOWN
AND STEP-UP
(I STEP X ESR)
RECOVERY
Figure 7. Voltage Positioning the Output
________________Applications Issues
Voltage Positioning and
Effective Efficiency
Powering new mobile processors requires careful
attention to detail to reduce cost, size, and power dissi-
pation. As CPUs became more power hungry, it was
recognized that even the fastest DC-DC converters
were inadequate to handle the transient power require-
ments. After a load transient, the output instantly
changes by ESR COUT × ? I LOAD . Conventional DC-DC
converters respond by regulating the output voltage
back to its nominal state after the load transient occurs
(Figure 7). However, the CPU only requires that the out-
put voltage remain above a specified minimum value.
Dynamically positioning the output voltage to this lower
limit allows the use of fewer output capacitors and
reduces power consumption under load.
For a conventional (nonvoltage-positioned) circuit, the
total voltage change is:
V P-P1 = 2 × (ESR COUT × ? I LOAD ) + V SAG + V SOAR
where V SAG and V SOAR are defined in Figure 8. Setting
the converter to regulate at a lower voltage when under
load allows a larger voltage step when the output cur-
rent suddenly decreases (Figure 7). So the total voltage
change for a voltage positioned circuit is:
V P-P2 = (ESR COUT × ? I LOAD ) + V SAG + V SOAR
where V SAG and V SOAR are defined in the Design
Procedure. Since the amplitudes are the same for both
circuits (V P-P1 = V P-P2 ), the voltage-positioned circuit
Figure 8. Transient-Response Regions
requires only twice the ESR. Since the ESR specifica-
tion is achieved by paralleling several capacitors, fewer
units are needed for the voltage-positioned circuit.
An additional benefit of voltage positioning is reduced
power consumption at high load currents. Because the
output voltage is lower under load, the CPU draws less
current. The result is lower power dissipation in the
CPU, although some extra power is dissipated in
R SENSE . For a nominal 1.6V, 18A output (R LOAD =
89m ? ), reducing the output voltage 2.9% gives an out-
put voltage of 1.55V and an output current of 17.44A.
Given these values, CPU power consumption is
reduced from 28.8W to 27.03W. The additional power
consumption of R SENSE is:
2.5m ? × (17.44A) 2 = 0.76W
and the overall power savings is as follows:
28.8W - (27.03W + 0.76W) = 1.01W
In effect, 1.8W of CPU dissipation is saved and the
power supply dissipates much of the savings, but both
the net savings and the transfer of heat away from the
CPU are beneficial. Effective efficiency is defined as
the efficiency required of a nonvoltage-positioned cir-
cuit to equal the total dissipation of a voltage-posi-
tioned circuit for a given CPU operating condition.
Calculate effective efficiency as follows:
1) Start with the efficiency data for the positioned
circuit (V IN , I IN , V OUT , I OUT ).
2) Model the load resistance for each data point:
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1716EEG+ | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1716EEG+T | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1716EEG-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX17175ETG+ | 制造商:Maxim Integrated Products 功能描述:BOOST REG W/INTEGRATED CHARGE PUMPS SWITCH CONTROL & HIGH-CU - Rail/Tube |
| MAX1717BEEG | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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