参数资料
型号: MAX1843ETI+
厂商: Maxim Integrated Products
文件页数: 9/13页
文件大小: 0K
描述: IC REG BUCK SYNC 2.7A 28TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 60
类型: 降压(降压)
输出类型: 两者兼有
输出数: 1
输出电压: 1.5V,1.8V,2.5V,可调
输入电压: 3 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 1MHz
电流 - 输出: 2.7A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-WFQFN 裸露焊盘
包装: 管件
供应商设备封装: 28-TQFN-EP(5x5)
2.7A, 1MHz, Low-Voltage, Step-Down Regulator with
Synchronous Rectification in TQFN Package
MAXIMUM RECOMMENDED
OPERATING FREQUENCY vs. INPUT VOLTAGE
1400
V OUT = +1.5     V
1200
LX
V OUT
1000
800
600
V OUT = +1.8V
V OUT = +2.5V
MAX1843
R2
FB
400
200
V OUT = +3.3V
R2 = R1(V OUT / V REF - 1)
V REF = 1.1V
R1
0
2.6
3.1
3.6
4.1
4.6
5.1
5.6
V IN (V)
Figure 3. Maximum Recommended Operating Frequency vs.
Input Voltage
Table 1. Recommended Component
Figure 4. Adjustable Output Voltage
Table 2. Output Voltage Programming
Values (I OUT = 2.7A)
PIN
OUTPUT
V IN
(V)
5
5
V OUT
(V)
3.3
2.5
f PWM
(kHz)
800
1180
L
(μH)
2.2
2.2
R TOFF
(k ? )
39
47
FBSEL
V CC
Unconnected
FB
Output voltage
Output voltage
VOLTAGE
(V)
2.5
1.5
5
1.8
850
2.2
75
5
3.3
3.3
1.5
2.5
1.8
715
570
985
2.2
1.5
1.5
100
39
43
REF
GND
Output voltage
Resistive
divider
1.8
Adjustable
3.3
1.5
940
1.5
56
Design Procedure
For typical applications, use the recommended compo-
nent values in Table 1. For other applications, take the
following steps:
1) Select the desired PWM-mode switching frequency.
See Figure 3 for maximum operating frequency.
2) Select the constant off-time as a function of input
voltage, output voltage, and switching frequency.
3) Select R TOFF as a function of off-time.
4) Select the inductor as a function of output voltage,
Setting the Output Voltage
The output of the MAX1843 is selectable between one
of three preset output voltages: +2.5V, +1.8V, and
+1.5V. For a preset output voltage, connect FB to the
output voltage, and connect FBSEL as indicated in
Table 2. For an adjustable output voltage, connect
FBSEL to GND, and connect FB to a resistive divider
between the output voltage and ground (Figure 4).
Regulation is maintained for adjustable output voltages
when V FB = V REF . Use a resistor in the 10k ? to 50k ?
range for R1. R2 is given by the equation:
R2 = R1 ? OUT
1 ?
off-time, and peak-to-peak inductor current.
? V
? V REF
?
?
?
where V REF is typically 1.1V.
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MAX1843ETI+ 功能描述:直流/直流开关调节器 2.7A 1MHz Step-Down 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
MAX1843ETI+T 功能描述:直流/直流开关调节器 2.7A 1MHz Step-Down 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
MAX1844EEP 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
MAX1844EEP+ 功能描述:电流型 PWM 控制器 Step-Down 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
MAX1844EEP+T 功能描述:电流型 PWM 控制器 Step-Down 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