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参数资料
| 型号： | MAX1957EUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 360kHz |
| 占空比： | 96% |
| 电源电压： | 3 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
Table 2. Suggested Manufacturers
MANUFACTURER
Central Semiconductor
Coilcraft
Fairchild
Kemet
Panasonic
Taiyo Yuden
Toko
COMPONENT
Diode
Inductors
MOSFETs
Capacitors
Capacitors
Capacitors
Inductors
PHONE
631-435-1110
800-322-2645
800-341-0392
864-963-6300
714-373-7366
408-573-4150
800-745-8656
WEBSITE
www.centralsemi.com
www.coilcraft.com
www.fairchildsemi.com
www.kemet.com
www.panasonic.com
www.t-yuden.com
www.toko.com
so the loop-gain equation at the crossover frequency is:
Applications Information
G EA ( f C ) × G MOD ( f C ) ×
V FB
V OUT
= 1
See Table 2 for suggested manufacturers of the com-
ponents used with the MAX1953/MAX1954/MAX1957.
PC Board Layout Guidelines
For the case where f zESR is greater than f c :
Careful PC board layout is critical to achieve low
switching losses and clean, stable operation. The
and
G EA ( f C ) = g mEA × R C
switching power stage requires particular attention.
Follow these guidelines for good PC board layout:
G MOD ( f C ) = g mc ×
R LOAD × ( f s × L )
R LOAD + ( f s × L )
×
f pMOD
f C
1) Place decoupling capacitors as close to IC pins as
possible. Keep separate power ground plane (con-
nected to pin 7) and signal ground plane (connect-
V OUT
g mEA FB MOD ( f C )
× ( f S × L )
+ ( f S × L )
then R C is calculated as:
R C =
× V × G
where g mEA = 110μS.
The error amplifier compensation zero formed by R C
and C C should be set at the modulator pole f pMOD .
C C is calculated by:
V OUT
I OUT ( MAX ) C OUT
C C = ×
V OUT R C
I OUT ( MAX )
As the load current decreases, the modulator pole also
decreases. However, the modulator gain increases
accordingly, and the crossover frequency remains the
same. For the case where f zESR is less than f C , add
another compensation capacitor C f from COMP to GND
to cancel the ESR zero at f zESR . C f is calculated by:
ed to pin 4).
2) Input and output capacitors are connected to the
power ground plane; all other capacitors are con-
nected to the signal ground plane.
3) Keep the high current paths as short as possible.
4) Connect the drain leads of the power MOSFET to a
large copper area to help cool the device. Refer to
the power MOSFET data sheet for recommended
copper area.
5) Ensure all feedback connections are short and
direct. Place the feedback resistors as close to the
IC as possible.
6) Route high-speed switching nodes away from sensi-
tive analog areas (FB, COMP).
7) Place the high-side MOSFET as close as possible to
the controller and connect IN (MAX1953/MAX1957)
or HSD (MAX1954) and LX to the MOSFET.
8) Use very short, wide traces (50mils to 100mils wide
if the MOSFET is 1in from the device).
C f =
1
2 π × R C × f zESR
TRANSISTOR COUNT: 2930
Chip Information
Figure 6 illustrates a numerical example that calculates
R C and C C values for the typical application circuit of
Figure 1 (MAX1953).
PROCESS: BiCMOS
______________________________________________________________________________________
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1957EUB+ | 功能描述:电流型 PWM 控制器 High-f Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1957EUB+T | 功能描述:电流型 PWM 控制器 High-f Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1957EUB-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX19586ETN | 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 |
| MAX19586ETN+D | 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 |
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