参数资料
| 型号： | MAX1945REUI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 6A 28TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 1.8V，2.5V，可调 |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 400kHz ~ 1.2MHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
1MHz, 1% Accurate, 6A Internal Switch
Step-Down Regulators
fz ESR = [1/(2 π ? C OUT R ESR )] = [1/(2 ? π ? 94 ? 10 -6 ?
0.005)] = 339kHz.
For a 0.68μH output inductor, choose the closed-loop
unity-gain crossover frequency (f c ) at 120kHz.
Determine the switching regulator DC gain:
G DC = gmc ? R OUT = 18.2 ? 0.3 = 5.46
then:
R C = (V OUT ? f C )/(gm EA ? V FB ? G DC ? fp LOAD ) =
(1.8 ? 120kHz)/(50 ? 10 -6 ? 0.8 ? 5.46 ? 5.554kHz) ≈
178k ? (1%)
C C = (C OUT ? R OUT )/R C =(94μF ? 0.3)/178k ? ≈ 156pF,
choose C C = 100pF, 10%
Output Inductor: 0.68μH/12A, 5m ? ESR (max), Coilcraft
DO3316P-681HC
Output Capacitor C5: 2XJMK432BJ476MM
Input Capacitor C1: LMK432BJ226MM
V CC = 3.3V OR 5V
PC Board Layout
Considerations
Careful PC board layout is critical to achieve clean and
stable operation. The switching power stage requires
particular attention. Follow these guidelines for good
PC board layout:
1) Place decoupling capacitors as close to the IC as
possible. Keep power ground plane (connected to
PGND) and signal ground plane (connected to
GND) separate. Star connect both ground plane at
output capacitor.
2) Connect input and output capacitors to the power
ground plane; connect all other capacitors to the
signal ground plane.
3) Keep the high-current paths as short and wide as
possible. Keep the path of switching current short
and minimize the loop area formed by the high-side
MOSFET, the low side MOSFET, and the input
capacitors. Avoid vias in the switching paths.
4) Connect IN, LX, and PGND separately to a large
copper area to help cool the IC to further improve
efficiency and long-term reliability.
5) Ensure all feedback connections are short and
direct. Place the feedback resistors as close to the
IC as possible.
C4
1 μ F
IN
BST
D1
6) Route high-speed switching nodes away from sen-
sitive analog areas (FB, COMP).
C3
IN
0.1 μ F
V IN = 2.5V
IN
MAX1945R
MAX1945S
LX
LX
Chip Information
C1
3 x 22 μ F
R1
10 ?
IN
V DD
V CC
LX
LX
LX
L1
0.68 μ F
1.8V, 6A
TRANSISTOR COUNT: 5000
PROCESS: BiCMOS
LX
CTL1
CTL2
LX
LX
GND
C6
0.1 μ F
R C
178k ?
C C
100pF
SYNCOUT
SYNC
COMP
FB
REF
FBSEL
C5
2 x 47 μ F
C4
0.22 μ F
PGND
Figure 3. Typical Application Circuit with all ceramic capacitors
(1MHz)
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1945SEUI | 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 |
| MAX1945SEUI+ | 功能描述:直流/直流开关调节器 1MHz 1% 6A Step-Down PWM 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 |
| MAX1945SEUI+T | 功能描述:直流/直流开关调节器 1MHz 1% 6A Step-Down PWM 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 |
| MAX1945SEUI-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 |
| MAX1946ETA | 制造商:Maxim Integrated Products 功能描述:SINGLE USB SWITCH WITH AUTORESET AND FAULT BL - Rail/Tube |
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