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| 型号： | MAX15021ATI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz ~ 4MHz |
| 电流 - 输出： | 2A，4A |
| 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
MAX15021
Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Tracking/Sequencing Capability
As seen in Figure 4b, a Type II compensator provides for
stable closed-loop operation, leveraging the +20dB/
decade slope of the capacitor’s ESR zero, while extend-
ing the closed-loop gain-bandwidth of the regulator. The
zero crossover now occurs at approximately three times
the uncompensated crossover frequency, f CO .
The Type II compensator’s midfrequency gain (approxi-
mately 12dB shown here) is designed to compensate
for the power modulator’s attenuation at the desired
crossover frequency, f CO (Gain E/A + Gain MOD = 0dB at
f CO ). In this example, the power modulator’s inherent
-20dB/decade rolloff above the ESR zero (f ZERO,ESR ) is
leveraged to extend the active regulation gain-band-
width of the voltage regulator. As shown in Figure 4b,
the net result is a three times increase in the regulator’s
gain bandwidth while providing greater than 75° of
phase margin (the difference between Gain E/A and
Gain MOD respective phases at crossover, f CO ).
Other filter schemes pose their own problems. For
instance, when choosing high-quality filter capacitor(s),
e.g. MLCCs, the inherent ESR zero may occur at a
much higher frequency, as shown in Figure 4c.
As with the previous example, the actual gain and
phase response is overlaid on the power modulator’s
asymptotic gain response. One readily observes the
more dramatic gain and phase transition at or near the
power modulator’s resonant frequency, f LC , versus the
gentler response of the previous example. This is due
to the filter components’ lower parasitic (DCR and ESR)
and corresponding higher frequency of the inherent
ESR zero. In this example, the desired crossover fre-
quency occurs below the ESR zero frequency.
In this example, a compensator with an inherent midfre-
quency double-zero response is required to mitigate
the effects of the filter’s double-pole phase lag. This is
available with the Type III topology.
As demonstrated in Figure 4d, the Type III’s midfre-
quency double-zero gain (exhibiting a +20dB/dec
slope, noting the compensator’s pole at the origin) is
designed to compensate for the power modulator ’s
double-pole -40dB/decade attenuation at the desired
crossover frequency, f CO (again, Gain E/A + Gain MOD =
0dB at f CO ) (see Figure 4d).
In the above example the power modulator’s inherent
(midfrequency) -40dB/decade rolloff is mitigated by the
midfrequency double zero ’s +20dB/decade gain to
extend the active regulation gain-bandwidth of the volt-
age regulator. As shown in Figure 4d, the net result is
an approximate doubling in the controller’s gain band-
width while providing greater than 55 degrees of phase
margin (the difference between Gain E/A and Gain MOD
respective phases at crossover, f CO ).
Design procedures for both Type II and Type III com-
pensators are shown below.
40
20
|G MOD |
MAX15021 fig04c
90
45
80
60
< G EA
MAX15021 fig04d
270
203
0
-20
f LC
f ESR
0
-45
40
20
0
|G EA |
f LC
f CO
135
68
0
-40
< G MOD
-90
-20
< G MOD
|G MOD |
-68
-40
-135
-60
-80
|G MOD |
ASYMPTOTE
-135
-180
-60
-80
f ESR
-203
-270
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 4c. Power Modulator Gain and Phase Response with
Low-Parasitic Capacitor(s) (MLCCs)
16
FREQUENCY (Hz)
Figure 4d. Power Modulator and Type III Compensator Gain
and Phase Response with Low Parasitic Capacitors (MLCCs)
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15021ATI/V+ | 制造商:Maxim Integrated Products 功能描述:DUAL, 4A/2A, 4MHZ, STEP-DOWN DC-DCREGULATOR WITH TRACKING/SE - Rail/Tube |
| MAX15021ATI/V+T | 制造商:Maxim Integrated Products 功能描述:DUAL, 4A/2A, 4MHZ, STEP-DOWN DC-DCREGULATOR WITH TRACKING/SE - Tape and Reel |
| MAX15021ATI+ | 功能描述:直流/直流开关调节器 Dual 4A/2A 4MHz w/Tracking/Seq RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX15021ATI+T | 功能描述:直流/直流开关调节器 Dual 4A/2A 4MHz w/Tracking/Seq RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX15021EVKIT+ | 功能描述:电源管理IC开发工具 MAX15021 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 |
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