- 您现在的位置：买卖IC网 > PDF目录1838 > MAX1639ESE+T (Maxim Integrated Products)IC REG CTRLR BUCK PWM CM 16-SOIC PDF资料下载
参数资料
| 型号： | MAX1639ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 84% |
| 电源电压： | 4.5 V ~ 5.5 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
Table 1. Component List for Standard Applications
COMPONENT
2.5V, 8A
LOAD REQUIREMENT
1.8V, 20A
C1
C2
D1 (optional)
D2
L1
N1
N2
R1
R7
R8
330μF, Sanyo OS-CON 6SA330M
(x2) 560μF, Sanyo OS-CON 4SP560M
Schottky diode, Nihon NSQ03A02
Central Semiconductor CMPSH-3
1.0μH, 9.3A, SMD
Coiltronics UP2B-1R0
1.0μH, 10A, SMD
Coilcraft D03316P-102HC
0.014 ? , 30V, SO8
Fairchild FDS6680
0.018 ? , 30V, SO8
International Rectifier IRF7413
0.014 ? , 30V, SO8
Fairchild FDS6680
0.018 ? , 30V, SO8
International Rectifier IRF7413
9m ? Dale,
WSL-2512-R009-J
10.0k ? , 1%
12.7k ? , 1%
(x3) 330μF, Sanyo OS-CON 6SA330M
(x5) 560μF, Sanyo OS-CON 4SP560M
Schottky diode, Motorola MBRD640
Central Semiconductor CMPSH-3
0.3μH, 25A, 0.9m ?
Panasonic ETQPAF0R3E
(x2) 0.010 ? , 30V, D 2 PAK, Fairchild FDB7030L
(x2) 0.014 ? , 30V, SO8, Fairchild FDS6680
(x2) 0.010 ? , 30V, D 2 PAK, Fairchild FDB7030L
(x2) 0.014 ? , 30V, SO8, Fairchild FDS6680
(x2) 7m ? , Dale WSL-2512-R007-J
10.0k ? , 1%
6.19k ? , 1%
Note: Parts used in evaluation board are shown in bold.
PWM Controller Block and Integrator
The heart of the current-mode PWM controller is a
multi-input, open-loop comparator that sums three sig-
nals (Figure 2): the buffered feedback signal, the cur-
rent-sense signal, and the slope-compensation ramp.
This direct-summing configuration approaches ideal
cycle-by-cycle control over the output voltage. The out-
put voltage error signal is generated by an error ampli-
fier that compares the amplified feedback voltage to an
internal reference.
Each pulse from the oscillator sets the main PWM latch
that turns on the high-side switch for a period deter-
mined by the duty factor (approximately V OUT / V IN ). The
current-mode feedback system regulates the peak
inductor current as a function of the output voltage error
signal. Since average inductor current is nearly the same
as peak current (assuming the inductor value is set rela-
tively high to minimize ripple current), the circuit acts as
a switch-mode transconductance amplifier. It pushes the
second output LC filter pole, normally found in a duty-
factor-controlled (voltage-mode) PWM, to a higher fre-
quency. To preserve inner-loop stability and eliminate
regenerative inductor current staircasing, a slope-
compensation ramp is summed into the main PWM com-
parator. Under fault conditions where the inductor cur-
rent exceeds the maximum current-limit threshold, the
high-side latch resets, and the high-side switch turns off.
Internal Reference
The internal 3.5V reference (REF) is accurate to ±1%
from 0°C to +85°C, making REF useful as a system ref-
erence. Bypass REF to AGND with a 0.1μF (min)
ceramic capacitor. A larger value (such as 2.2μF) is
recommended for high-current applications. Load reg-
ulation is 10mV for loads up to 100μA. Reference
undervoltage lockout is between 2.7V and 3V. Short-
circuit current is less than 4mA.
Synchronous-Rectifier Driver
Synchronous rectification reduces conduction losses in
the rectifier by shunting the normal Schottky diode or
MOSFET body diode with a low-on-resistance MOSFET
switch. The synchronous rectifier also ensures proper
start-up by precharging the boost-charge pump used
for the high-side switch gate-drive circuit. Thus, if you
must omit the synchronous power MOSFET for cost or
other reasons, replace it with a small-signal MOSFET,
such as a 2N7002.
The DL drive waveform is simply the complement of the
DH high-side drive waveform (with typical controlled
dead time of 30ns to prevent cross-conduction or
shoot-through). The DL output’s on-resistance is 0.7 ?
(typ) and 2 ? (max).
_______________________________________________________________________________________
7
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1641EEE+ | IC SW-MODE CUR SOURCE ADJ 16QSOP |
| MAX1644EAE-T | IC REG BUCK SYNC ADJ 2A 16SSOP |
| MAX1651CSA | IC REG CTRLR BUCK PWM 8-SOIC |
| MAX1653EEE-T | IC REG CTRLR BUCK PWM CM 16-QSOP |
| MAX1659ESA+ | IC REG LDO 5V/ADJ .35A 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1639EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit the MAX1639 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 |
| MAX163BCNG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX163BCNG+ | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX163BCWG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX163BCWG+ | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
发布紧急采购，3分钟左右您将得到回复。