- 您现在的位置：买卖IC网 > PDF目录1852 > MCP1601T-I/MS (Microchip Technology)IC REG BUCK SYNC ADJ 0.5A 8MSOP PDF资料下载
参数资料
| 型号： | MCP1601T-I/MS |
| 厂商： | Microchip Technology |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.5A 8MSOP |
| 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： | 0.9 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 750kHz |
| 电流 - 输出： | 500mA |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
| 配用： | MCP1601EV-ND - BOARD EVALUATION FOR MCP1601 |
MCP1601
5.2.1.1
Input
The maximum peak inductor current is equal to the
For all BUCK-derived topologies, the input current is
pulled from the source in pulses, placing some burden
on the input capacitor. For most applications, a 10 μF
ceramic capacitor connected to the MCP1601 input is
recommended to filter the current pulses. Less capaci-
tance can be used for applications that have low source
maximum DC output current plus 1/2 the peak-to-peak
AC ripple current in the inductor. The AC ripple current
in the inductor can be calculated using the following
relationship.
EQUATION
impedance. The ripple current ratings for ceramic
capacitors are typically very high due to their low loss
characteristics. Lower-cost electrolytic capacitors can
be used, but ripple current ratings should not be
exceeded.
Solving for ? I L :
VL = L ×
dI
d t
5.2.1.2
Output
EQUATION
For BUCK-derived topologies, the output capacitor fil-
ters the continuous AC inductor ripple current while
operating in the PWM mode. Typical inductor AC ripple
current for the MCP1601 is 120 mA peak-to-peak with
a 3.6V input, 10 μH inductor for a 1.8V output applica-
tion. Using an output capacitor with 0.3 ? of ESR, the
output ripple will be approximately 36 mV.
The recommended range for the output capacitor is
from 10 μF (±20%) to 47 μF (±20%). Larger value
? IL = ( VL ? L ) × ? t
Where: ? t is equal to the “ on ” time of the P-Channel
switch and,
V L = the voltage across the inductor
(V IN - V OUT )
Example:
capacitors can be used, but require evaluation of the
control system stability.
EQUATION
V IN =
V OUT =
F SW =
3.6V
1.8V
750 kHz
V Ripple = ILRipple × COUTesr
I OUT(MAX) = 300 mA
The approximate “ on ”
time is
equal
to
the
Duty Cycle (V OUT / V IN ) x 1/F SW .
The above equation assumes that the output capaci-
tance is large enough so that the ripple voltage (as a
result of charging and discharging the capacitor) is
negligible and can be used for applications that use
electrolytic capacitors with esr > 0.3 ?.
When using a 10 μF ceramic X5R dielectric capacitor,
the output ripple voltage is typically less than 10 mV.
T ON =
T ON =
V L =
? I L =
? I L =
I L(PEAK) =
(1.8V/3.6V) x 1/(750 kHz)
667 ns
3.6V - 1.8V = 1.8V
(1.8V/10 μH) x 667 ns
120 mA
I OUTMAX + 1/2 ? I L
5.2.2
BUCK INDUCTOR
I L(PEAK) =
300 mA + (120 mA) / 2
There are many suppliers and choices for selecting the
BUCK inductor. The application, physical size require-
ments (height vs. area), current rating, resistance,
mounting method, temperature range, minimum induc-
tance and cost all need to be considered in making the
best choice.
When choosing an inductor for the MCP1601 Synchro-
nous BUCK, there are two primary electrical
specifications to consider.
I L(PEAK) = 360 mA
Many suppliers of inductors rate the maximum RMS
(Root Mean Square) current. The BUCK inductor RMS
current is dependent on the output current, inductance,
input voltage, output voltage and switching frequency.
For the MCP1601, the inductor RMS current over the
2.7V to 5.5V input range, 0.9V to 5V output voltage
range is no more than 15% higher than the average DC
output current for the minimum recommended induc-
tance of 10 μH ±20%. When selecting an inductor that
1.
2.
Current rating of the inductor.
Resistance of the inductor.
has a maximum RMS current rating, use a simple
approximation that the RMS current is 1.2 times the
When selecting a BUCK inductor, many suppliers
specify a maximum peak current.
? 2003 Microchip Technology Inc.
maximum output current.
Example:
I OUT(MAX) = 300 mA, the inductor should have an RMS
rating > 360 mA (1.2 x I OUT(MAX) ).
DS21762A-page 13
相关PDF资料 |
PDF描述 |
|---|---|
| MCP1602-330I/MF | IC REG BUCK SYNC 3.3V 0.5A 8DFN |
| MCP1603T-080I/OS | IC REG BUCK SYNC 0.8V TSOT23-6 |
| MCP1612-ADJI/MF | IC REG BUCK SYNC ADJ 1A 8DFN |
| MCP1624T-I/MC | IC BOOST SYNC REG PWM/PFM 8DFN |
| MCP1630-E/MS | IC REG CTRLR BST FLYBK ISO 8MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1602 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:2.0 MHz, 500 mA Synchronous Buck Regulator with Power-Good |
| MCP1602-080I/MF | 功能描述:开关变换器、稳压器与控制器 20MHz 05A Synch-Buck PFM/PWM Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCP1602-080I/MS | 功能描述:开关变换器、稳压器与控制器 20MHz 05A Synch-Buck PFM/PWM Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCP1602-120I/MF | 功能描述:开关变换器、稳压器与控制器 20MHz 05A Synch-Buck PFM/PWM Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCP1602-120I/MS | 功能描述:开关变换器、稳压器与控制器 20MHz 05A Synch-Buck PFM/PWM Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。