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| 型号： | MAX8646ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 24TQFN |
| 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： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 3.2 V |
| 输入电压： | 2.35 V ~ 3.6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 6A |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
6A, 2MHz Step-Down Regulator
with Integrated Switches
Shutdown Mode
Drive EN to GND to shut down the IC and reduce quies-
cent current to less than 12μA. During shutdown, the LX
Table 1. CTL1 and CTL2 Output Voltage
Selection
is high impedance. Drive EN high to enable the
MAX8646.
Thermal Protection
Thermal-overload protection limits total power dissipation
in the device. When the junction temperature exceeds T J
= +165°C, a thermal sensor forces the device into shut-
down, allowing the die to cool. The thermal sensor turns
the device on again after the junction temperature cools
by 20°C, causing a pulsed output during continuous
overload conditions. The soft-start sequence begins after
recovery from a thermal-shutdown condition.
CTL1
GND
V DD
GND
GND
Unconnected
Unconnected
Unconnected
V DD
V DD
CTL2
GND
V DD
Unconnected
V DD
GND
Unconnected
V DD
GND
Unconnected
V OUT (V)
0.6
0.7
0.8
1.0
1.2
1.5
1.8
2.0
2.5
Applications Information
IN and V DD Decoupling
To decrease the noise effects due to the high switching
where the output ripple due to output capacitance,
ESR, and ESL is:
frequency and maximize the output accuracy of
the MAX8646, decouple V IN with a 22μF capacitor from
V IN to PGND. Also decouple V DD with a 1μF from V DD
V RIPPLE ( C ) =
I P ? P
8 x C OUT x f S
to GND. Place these capacitors as close to the IC
as possible.
V RIPPLE ( ESR ) = I P ? P x ESR
V OUT × ( V IN ? V OUT )
V RIPPLE ( ESL ) = P ? P x ESL
V RIPPLE ( ESL ) = P ? P x ESL
Inductor Selection
Choose an inductor with the following equation:
L =
f S × V IN × LIR × I OUT ( MAX )
or:
I
t ON
I
t OFF
I P ? P = IN OUT x OUT
where LIR is the ratio of the inductor ripple current to full
load current at the minimum duty cycle. Choose LIR
between 20% to 40% for best performance and stability.
Use an inductor with the lowest possible DC resistance
that fits in the allotted dimensions. Powdered iron ferrite
core types are often the best choice for performance.
With any core material, the core must be large enough
not to saturate at the current limit of the MAX8646.
Output-Capacitor Selection
The key selection parameters for the output capacitor are
capacitance, ESR, ESL, and voltage-rating requirements.
These affect the overall stability, output ripple voltage,
and transient response of the DC-DC converter. The out-
put ripple occurs due to variations in the charge stored
in the output capacitor, the voltage drop due to the
capacitor ’s ESR, and the voltage drop due to the
capacitor’s ESL. Calculate the output voltage ripple
due to the output capacitance, ESR, and ESL:
V RIPPLE = V RIPPLE ( C ) +
V RIPPLE ( ESR ) + V RIPPLE ( ESL )
or whichever is larger.
The peak inductor current (I P-P ) is:
V ? V V
f S × L V IN
Use these equations for initial capacitor selection.
Determine final values by testing a prototype or an
evaluation circuit. A smaller ripple current results in less
output-voltage ripple. Since the inductor ripple current
is a factor of the inductor value, the output voltage rip-
ple decreases with larger inductance. Use ceramic
capacitors for low ESR and low ESL at the switching
frequency of the converter. The ripple voltage due to
ESL is negligible when using ceramic capacitors.
Load-transient response depends on the selected out-
put capacitance. During a load transient, the output
instantly changes by ESR x ? I LOAD . Before the con-
troller can respond, the output deviates further,
depending on the inductor and output capacitor val-
ues. After a short time, the controller responds by regu-
______________________________________________________________________________________
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相关代理商/技术参数 |
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|---|---|
| MAX8646EVKIT+ | 功能描述:直流/直流开关调节器 Evaluation Kit for the MAX8646 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 |
| MAX8647ETE+ | 功能描述:LED照明驱动器 Charge Pump for 6 White/RGB LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8647ETE+T | 功能描述:LED照明驱动器 Charge Pump for 6 White/RGB LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8648ETE | 制造商:MAXIM 功能描述:Pb Free |
| MAX8648ETE+ | 功能描述:LED照明驱动器 Charge Pump for 6 White/RGB LEDs RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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