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| 型号： | MAX1971EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 0.75A DL 16QSOP |
| 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： | 2 |
| 输出电压： | 1.5V，1.8V，2.5V，3.3V，可调 |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 700kHz |
| 电流 - 输出： | 750mA |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-
Down Regulator with POR and RSI/PFO
Table 1. Output Voltage Settings
Output Capacitor
The key selection parameters for the output capacitor
FBSEL1
V CC
GND
Open
OUTPUT 1
3.3V
1.8V
Ext Divider
FBSEL2
V CC
GND
Open
OUTPUT 2
2.5V
1.5V
Ext Divider
are its capacitance, ESR, ESL, and the voltage rating
requirements. These affect the overall stability, output
ripple voltage, and transient response of the DC-DC
converter.
The output ripple is due to variations in the charge
stored in the output capacitor, the voltage drop due to
For most designs, a reasonable inductor value (L INIT ) is
derived from the following equation:
the capacitor’s ESR, and the voltage drop due to the
capacitor’s ESL.
L INIT =
V OUT ( V IN ? V OUT )
V IN × LIR × I OUT ( MAX ) × f OSC
V RIPPLE = V RIPPLE ( C ) + V RIPPLE ( ESR ) + V RIPPLE ( ESL )
The output voltage ripple due to the output capaci-
Keep the inductor current ripple percentage LIR
tance, ESR, and ESL is:
between 20% and 40% of the maximum load current for
best compromise of cost, size, and performance. The
maximum inductor current is:
V RIPPLE ( C ) =
I P ? P
8 × C OUT × f SW
I L ( MAX ) = ? 1 +
?
?
LIR ?
2 ? ?
I OUT ( MAX )
V RIPPLE ( ESR ) = I P ? P × ESR
Input Capacitor
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
V RIPPLE (ESL) = (I P-P /T ON ) ESL or (I P-P /T OFF )
whichever is greater.
I P-P is the peak-to-peak inductor current:
ESL,
ripple on the input caused by the circuit’s switching.
I P ? P = IN OUT × OUT
The input capacitor must meet the ripple current
requirement (I RMS ) imposed by the switching currents
defined by the following equation:
V ? V V
f SW × L V IN
These equations are suitable for initial capacitor selec-
I RMS =
1
V IN
I OUT 1 2 × V OUT 1 ( V IN ? V OUT 1 ) +
I OUT 2 2 × V OU T 2 ( V IN ? V OUT 2 )
tion, but final values should be set by testing a proto-
type or evaluation circuit. As a rule, a smaller ripple
current results in less output voltage ripple. Since the
inductor ripple current is a factor of the inductor value,
A ceramic capacitor is recommended due to its low
equivalent series resistance (ESR), equivalent series
inductance (ESL), and lower cost. Choose a capacitor
that exhibits less than a 10°C temperature rise at the
maximum operating RMS current for optimum long-term
reliability.
Table 2. Suggested Inductors
the output voltage ripple decreases with larger induc-
tance. Ceramic capacitors are recommended due to
their low ESR and ESL at the switching frequency of the
converter. For ceramic capacitors, the ripple voltage
due to ESL is negligible.
Load transient response depends on the selected out-
put capacitor. During a load transient, the output
instantly changes by ESR ? I LOAD . Before the con-
MANUFACTURER
Coilcraft
Sumida
Sumida
PART
DO1606
CR43-4R7
CDRH3D16-4R7
INDUCTANCE
(μH)
4.7
4.7
4.7
ESR
(m ? )
120
108.7
80
SATURATION
CURRENT (A)
1.2
1.15
0.9
DIMENSIONS (mm)
5.3 ? 5.3 ? 2
4.5 ? 4 ? 3.5
3.8 ? 3.8 ? 0.8
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1972EEE | 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 |
| MAX1972EEE+ | 功能描述:直流/直流开关调节器 Dual 180 Out 1.4MHz 750mA 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 |
| MAX1972EEE+T | 功能描述:直流/直流开关调节器 Dual 180 Out 1.4MHz 750mA 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 |
| MAX1972EEE-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 |
| MAX1972EEE-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 |
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