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参数资料
| 型号： | MAX1974EUB+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 5.5 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
Smallest 1A, 1.4MHz Step-Down Regulators
V OUT = 2.5V
I OUT(MAX) = 1A
C OUT = 4.7μF
V FB = 1.25V
R CS = 0.26 ?
g m = 50μS
f C = 140kHz
PC Board Layout
A properly designed PC board layout is important in
any switching regulator. The switching power stage
requires particular attention. Follow these guidelines for
good PC board layout:
1) Place decoupling capacitors as close to IC pins as
possible. Keep the power ground plane (connected
to PGND) and signal ground plane (connected to
GND) separate. Connect the two ground planes with
a single connection from PGND to GND.
C C =
V FB
0 . 5 × I OUT ( MAX )
×
1
R CS
× g m ×
1
2 π × f C
2) Input and output capacitors are connected to the
power ground plane; all other capacitors are con-
nected to the signal ground plane.
× × 50 × 10 ? 6 ×
=
1 . 25 1
0 . 5 × 1 0 . 26
1
2 π × 140000
= 547 pF
3) Keep the high-current paths as short and wide as
possible.
4) If possible, connect IN, LX, and PGND separately to
Select the nearest standard value: C C = 560pF
a large land area to help cool the IC to further
R C =
C OUT
C C
×
V OUT
0 . 5 × I OUT ( MAX )
=
improve efficiency and long-term reliability.
5) Ensure all feedback connections are short and
direct. Place feedback resistors (if used) as close to
560 × 10
4 . 7 × 10 ? 6
? 12
×
2 . 5
0 . 5 × 1
= 41 . 9 k ?
the IC as possible.
6) Route high-speed switching nodes (LX) away from
sensitive analog areas (FB, COMP, SS).
Select the nearest standard value: R C = 43k ?
Table 4. Recommended Components for the MAX1973
V OUT (V)
2.5
1.8
C IN (μF)
4.7
4.7
C OUT (μF)
4.7
4.7
C C (pF)
560
560
R C (k ? )
43
30
Table 5. Recommended Components for the MAX1974
V OUT (V)
1.5
1.0
C IN (μF)
4.7
4.7
C OUT (μF)
4.7
4.7
C C (pF)
330
330
R C (k ? )
43
27
Selector Guide
Chip Information
PART
MAX1973EUB
MAX1974EUB
FEATURES
Voltage Margining
Power-OK Output
OUTPUT PRESET
1.8V or 2.5V
1V or 1.5V
TRANSISTOR COUNT: 1998
PROCESS: BiCMOS
14
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1974EUB+ | 功能描述:直流/直流开关调节器 1A 1.4MHz Step-Down Regulator 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 |
| MAX1974EUB+T | 功能描述:直流/直流开关调节器 1A 1.4MHz Step-Down Regulator 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 |
| MAX1974EUB-G05 | 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 |
| MAX1974EUB-T | 功能描述:直流/直流开关调节器 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 |
| MAX1974EUB-TG05 | 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 |
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