参数资料
| 型号： | MAX1945REUI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/19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
Table 3. Compensation Values for Output Voltages (1MHz)
VOUT (V)
R C (1%)
C C (10%)
0.8
100k ?
330pF
1.2
100k ?
330pF
1.8
178k ?
100pF
2.2
178k ?
100pF
3.3
249k ?
100pF
mum zero-crossing frequency should be less than one-
third of the load-impedance zero frequency, fz ESR . The
previous requirement on the ESR zero frequency
applies to ceramic output capacitors.
The loop-gain equation at unity-gain frequency, f C , is
given by:
G EA(fc) ? G DC ? (f PLOAD /f C ) ? (V FB /V OUT ) = 1
where G EA(fc) = gm EA ? R C , and gm EA = 50μ, the
transconductance of the voltage error amplifier.
Calculate R C as:
R C = (V OUT ? f C )/(gm EA ? V FB ? ? G DC ? f PLOAD )
Set the error-amplifier compensation zero formed by R C
and C C equal to the load-impedance pole frequency,
f PLOAD , at maximum load. Calculate C C as follows:
As the load current decreases, the load-impedance
pole also decreases; however, the switching regulator
DC gain increases accordingly, resulting in a constant
closed-loop unity-gain frequency. Table 3 shows the
values for R C and C C at various output voltages. The
values are based on 2 ? 47μF output capacitors and a
0.68μH output inductance.
For C OUT = 2 ? 47μF and L = 0.68μH. Decrease R C
accordingly when using large values of C OUT or L.
V OUT = 1.8V
I OUT(MAX) = 6A
C OUT = 2 ? 47μF
R ESR = 0.005 ?
gm EA = 50μ
gmc = 18.2s
f SWITCH = 1.0MHz
R OUT = V OUT /I OUT(MAX) = 1.8V/6A= 0.3 ?
C C = (C OUT ? R OUT )/R C
fp DC = [1/(2 π ? C OUT ? (R OUT + R ESR ))] = [1/(2
94 ? 10 -6 ? (0.3 + 0.005))] = 5.554kHz
?
π
?
Applications Information
BAT54A
0.1 μ F
10V
BAT54A
0.1 μ F
10V
INPUT:
2.6V TO 5.5V
IN
BST
LX
1 μ H
OUTPUT:
1.8V, 6A
INPUT:
2.6V TO 5.5V
IN
BST
LX
1 μ H
V OUT
100 μ F
8V
C IN
R IN
V DD
V CC
CTL1
MAX1945R
MAX1945S
PGND
180 μ F
4V
100 μ F
8V
C IN
R IN
V DD
V CC
CTL1
MAX1945R
MAX1945S
PGND
SYNCOUT
180 μ F
4V
R1
R C
CTL2
COMP
FB
SYNCOUT
R C
CTL2
COMP
FB
FBSEL
C C
FBSEL
SYNC
GND
REF
0.22 μ F
10V
C C
SYNC
GND
REF
0.22 μ F
10V
R2
Figure 1. Typical Application Circuit (Fixed Output Voltage)
Figure 2. Typical Application Circuit (Adjustable Output
Voltage)
16
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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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