- 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： | 17/24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
Type II: Compensation when f CO > f ZERO,ESR
When the f CO is greater than f ESR , a Type II compensa-
V OUT_
C CF
tion network provides the necessary closed-loop com-
pensated response. The Type II compensation network
provides a midband compensating zero and a high-fre-
R 1
R F
C F
quency pole (see Figures 5a and 5b).
R F C F provides the midband zero f MID,ZERO , and
R F C CF provides the high-frequency pole, f HIGH,POLE .
Use the following procedure to calculate the compen-
R 2
FB_
V REF
COMP_
sation network components.
Calculate the f ESR and LC double pole, f LC :
Figure 5a. Type II Compensation Network
f ESR =
f LC ≈
1
2 π × ESR × C OUT
1
2 π × L × C OUT
GAIN
(dB)
where C OUT is the regulator output capacitor and ESR
is the series resistance of C OUT . See the Output-
Capacitor Selection section for more information on cal-
culating C OUT and ESR.
Set the compensator’s leading zero, f Z1 , at or below the
filter’s resonant double-pole frequency from:
1ST ASYMPTOTE
( ω R 1 C F ) -1
2ND ASYMPTOTE
(R F R 1 ) -1
3RD ASYMPTOTE
( ω R F C CF ) -1
f Z1 ≤ f LC
Set the compensator’s high-frequency pole, f P1 , at or
1ST POLE
(AT ORIGIN)
1ST ZERO
(R F C F ) -1
2ND POLE
(R F C CF ) -1
ω (rad/sec)
f P1 ≤ SW
Gain E/A = F
Gain MOD = 4(V/V) ×
×
4 × ESR x V FB
R F 4 × ESR x V FB
2 π × f CO × L x V OUT_
below one-half the switching frequency, f SW :
f
2
To maximize the compensator’s phase lead, set the
desired crossover frequency, f CO , equal to the geomet-
ric mean of the compensator’s leading zero, f Z1 , and
high-frequency pole, f P1 , as follows:
f CO = f Z1 × f P1
Select the feedback resistor, R F , in the range of 3.3k Ω
to 30k Ω .
Calculate the gain of the modulator (Gain MOD )—com-
prised of the regulator’s pulse-width modulator, LC filter,
feedback divider, and associated circuitry—at the desired
crossover frequency, f CO , using the following equation:
ESR [m Ω ] V FB [V]
( 2 π × f CO [kHz] × L[ μ H] ) V OUT_ [V]
where V FB is the 0.6V (typ) FB_ input-voltage set-point,
L is the value of the regulator inductor, ESR is the
Maxim Integrated
Figure 5b. Type II Compensation Network Response
series resistance of the output capacitor, and V OUT_ is
the desired output voltage.
The gain of the error amplifier (Gain E/A ) in the midband
frequencies is:
R [k Ω ]
R 1 [k Ω ]
The total loop gain is the product of the modulator gain
and the error amplifier gain at f CO and should be set
equal to 1 as follows:
Gain MOD x Gain E/A = 1
So:
? R F ? ? ?
? ? ? ?
20 × log 10 ? R 1 ? + 20 × log 10 ?? 2 π × f CO × L x V OUT_ ?? = 0dB
× = 1
R 1
17
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。