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| 型号： | MAX15021ATI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24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
Below are equations that define the power modulator:
use aluminum electrolytic capacitors while for space-
sensitive applications, use low-ESR tantalum or multilay-
= = 4V/V
Gain MOD(DC) =
V AVIN
V RAMP
V AVIN
V AVIN
4
er ceramic chip (MLCC) capacitors at the output. The
higher switching frequencies of the MAX15021 allow the
use of MLCC as the primary filter capacitor(s).
2 π × L × C OUT × ? OUT
? R OUT + DCR ?
f LC =
1
? R + ESR ?
?
≈
1
2 π × L × C OUT
First, select the passive and active power components
that meet the application output ripple, component
size, and component cost requirements. Second,
choose the small-signal compensation components to
f ESR =
1
2 π × ESR × C OUT
achieve the desired closed-loop frequency response
and phase margin as outlined below.
Closed-Loop Response and Compensation
R OUT is the load resistance of the regulator, f LC is the
resonant break frequency of the filter, and f ESR is the
ESR zero of the output capacitor. See the Closed-Loop
Response and Compensation of Voltage-Mode
Regulators section for more information on f LC and f ESR .
The switching frequency (f SW ) is programmable
between 500kHz and 4MHz. Typically, the crossover
frequency (f CO )—the frequency at which the system’s
closed-loop gain is equal to unity (crosses 0dB) —
should be set at or below one-tenth the switching fre-
quency (f SW /10) for stable closed-loop response.
The MAX15021 provides an internal voltage-mode error
amplifier with its inverting input and its output available to
the user for external frequency compensation. The flexi-
bility of external compensation for each controller offers
a wide selection of output filtering components, especial-
ly the output capacitor. For cost-sensitive applications,
of Voltage-Mode Regulators
The power modulator’s LC lowpass filter exhibits a vari-
ety of responses, dependent on the value of the L and
C and their parasitics. Higher resistive parasitics
reduce the Q of the circuit, reducing the peak gain and
phase of the system; however, efficiency is also
reduced under these circumstances.
One such response is shown in Figure 4a. In this exam-
ple, the ESR zero occurs relatively close to the filter’s
resonant break frequency, f LC . As a result, the power
modulator’s uncompensated crossover is approximate-
ly one-third the desired crossover frequency, f CO . Note
also, the uncompensated rolloff through the 0dB plane
follows a single-pole, -20dB/decade slope, and 90° of
phase lag. In this instance, the inherent phase margin
ensures a stable system; however, the gain-bandwidth
product is not optimized.
40
20
f LC
MAX15021 fig04a
90
45
80
60
< G EA
MAX15021 fig04b
180
135
0
|G MOD | ASYMPTOTE
|G MOD |
0
40
20
|G EA |
f LC
f CO
90
45
-20
< G MOD
f ESR
-45
0
0
-40
-60
-80
-90
-135
-180
-20
-40
-60
-80
< G MOD
f ESR
|G MOD |
-45
-90
-135
-180
10
100
1k
10k
100k
1M
10M
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 4a. Power Modulator Gain and Phase Response with
Lossy Bulk Output Capacitor(s) (Aluminum)
Maxim Integrated
FREQUENCY (Hz)
Figure 4b. Power Modulator and Type II Compensator Gain and
Phase Response with Lossy Bulk Output Capacitor(s) (Aluminum)
15
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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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