- 您现在的位置：买卖IC网 > PDF目录14390 > MAX15021ATI+ (Maxim Integrated Products)IC REG BUCK SYNC ADJ DL 28TQFN PDF资料下载
参数资料
| 型号： | MAX15021ATI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/24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
Solving for R 1 :
R 1 [k Ω ] =
R F [k Ω ] × 4 × ESR[m Ω ] × V FB [V]
2 π × f CO [kHz] × L[ μ H] × V OUT_ [V]
R I
V OUT_
R 1
C CF
R F
C F
where V FB is the 0.6V (typ) FB_ input-voltage set-point,
C I
L is the value of the regulator inductor, ESR is the
series resistance of the output capacitor, and V OUT_ is
the desired output voltage.
1) C F is determined from the compensator’s leading
R 2
FB_
V REF
COMP_
zero, f Z1 , and R F as follows:
C F [ μ F] =
1
2 π × R F [k Ω ] × f Z1 [kHz]
Figure 6a. Type III Compensation Network
GAIN
(dB)
2) C CF is determined from the compensator’s high-fre-
quency pole, f P1 , and R F as follows:
( )
C CF [ μ F] =
1
2 π × R F [k Ω ] × f P1 [kHz]
1ST ASYMPTOTE
( ω R 1 C F ) -1
4TH ASYMPTOTE
R F
R I
( )
3) Calculate R 2 using the following equation:
2ND ASYMPTOTE
R F 1
R 1
3RD ASYMPTOTE
( ω R F C I ) -1
5TH ASYMPTOTE
( ω R I C CF ) -1
R 2 1 [k Ω ] ×
[k Ω ] = R
V FB [V]
V OUT_ [V] ? V FB [V]
where V FB = 0.6V (typ) and V OUT_ is the output voltage
of the regulator.
1ST POLE
(AT ORIGIN)
1ST ZERO 2ND POLE
(R F C F ) -1 (R I C I ) -1
2ND ZERO
(R 1 C I ) -1
3RD POLE
(R F C CF ) -1
ω (rad/sec)
Type III: Compensation when f CO < f ESR
As indicated above, the position of the output capaci-
tor’s inherent ESR zero is critical in designing an appro-
priate compensation network. When low-ESR ceramic
output capacitors (MLCCs) are used, the ESR zero fre-
quency (f ESR ) is usually much higher than the desired
crossover frequency (f CO ). In this case, a type III com-
pensation network is recommended (see Figure 6a).
As shown in Figure 6b, the Type III compensation net-
Figure 6b. Type III Compensation Network Response
f P1 introduces a pole at zero frequency (integrator) for
nulling DC output voltage errors.
f P1 = at the origin (0Hz)
Depending on the location of the ESR zero (f ESR ), f P2
can be used to cancel it, or to provide additional atten-
uation of the high-frequency output ripple.
work introduces two zeros and three poles into the con-
trol loop. The error amplifier has a low-frequency pole
at the origin, two zeros, and two higher frequency poles
f P2 =
1
2 π × R I × C I
at the following frequencies:
f P3 attenuates the high-frequency output ripple.
f Z1 =
f Z2 =
f P3 =
2 π × R F × F CF
1
2 π × R F × C F
1
2 π × C I × (R 1 + R I )
Two midband zeros (f Z1 and f Z2 ) are designed to com-
pensate for the pair of complex poles introduced by the
LC filter.
1
2 π × R F × ( C F C CF
Since C CF << C F then:
)
=
f P3 =
1
C × C
C F + C CF
1
2 π × R F × C CF
18
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| EB83-S0L2240W-D | CONN EDGEBOARD DUAL 44POS 5A |
| VI-B5W-EX-F1 | CONVERTER MOD DC/DC 5.5V 75W |
| EB82-S0K2240W | CONN EDGEBOARD DUAL 44POS 5A |
| MAX6467US31D3+T | IC MPU/RESET CIRC 3.075V SOT143 |
| VI-B5X-EX-F1 | CONVERTER MOD DC/DC 5.2V 75W |
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 |
发布紧急采购，3分钟左右您将得到回复。