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参数资料
| 型号： | ADP2301-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADP2301 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 1.2A |
| 输入电压： | 3 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.4MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2301 |
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Data Sheet
5.5
ADP2300/ADP2301
PROGRAMMING THE PRECISION ENABLE
5.3
5.1
4.9
4.7
4.5
4.3
4.1
3.9
FOR STARTUP
FOR RUNNING
Generally, the EN pin can be easily tied to the VIN pin so that the
device automatically starts up when the input power is applied.
However, the precision enable feature allows the ADP2300/
ADP2301 to be used as a programmable UVLO by connecting
a resistive voltage divider to V IN , as shown in Figure 46. This
configuration prevents the start-up problems that can occur
when V IN ramps up slowly in soft start with a relatively high
load current.
3.7
3.5
1
10
100
V OUT = 3.3V
f SW = 1.4MHz
1k
V IN
R EN1
VIN
ADP2300/
ADP2301
LOAD CURRENT (mA)
Figure 43. Minimum Input Voltage vs. Load Current
R EN2
EN
Based on three conversion limitations (the minimum on time,
the minimum off time, and the bootstrap dropout voltage),
22
Figure 46. Precision Enable Used as a Programmable UVLO
The precision enable feature also allows the ADP2300/ADP2301 to
be sequenced precisely by using a resistive voltage divider with
17
ADP2300/
ADP2301
12
OTHER DC-TO-DC
OUTPUT
R EN1
EN
R EN2
7
Figure 47. Precision Enable Used as a Sequencing Control
from Another DC-to-DC Output
2
0
2
4
6
MAXIMUM INPUT FOR ADP2300
MAXIMUM INPUT FOR ADP2301
MINIMUM INPUT FOR ADP2300/ADP2301
8 10 12 14
16
With a 1.2 μA pull-down current on the EN pin, the equation for
the start-up voltage in Figure 46 and Figure 47 is
V STARTUP = ? ?
+ 1 . 2 μA ? ? × R EN 1 + 1 . 2 V
V OUT (V)
Figure 44. Voltage Conversion Limitations
LOW INPUT VOLTAGE CONSIDERATIONS
For low input voltage between 3 V and 5 V, the internal boot
regulator cannot provide enough 5.0 V bootstrap voltage due to
the internal dropout voltage. As a result, the increased MOSFET
R DS(ON) reduces the available load current. To prevent this, add
an external small-signal Schottky diode from a 5.0 V external
bootstrap bias voltage. Because the absolute maximum rating
between the BST and SW pins is 6.0 V, the bias voltage should
be less than 5.5 V. Figure 45 shows the application diagram for
the external bootstrap circuit.
? 1 . 2 V ?
? R EN 2 ?
where:
V STARTUP is the start-up voltage to enable the chip.
R EN1 is the resistor from the dc source to EN.
R EN2 is the resistor from EN to GND.
3V ~ 5V
VIN
BST
SCHOTTKY DIODE
5V BIAS
VOLTAGE
ADP2300/
ADP2301
SW
ON
EN
GND
FB
OFF
Figure 45. External Bootstrap Circuit for Low Input Voltage Application
Rev. C | Page 17 of 28
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2302 | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad-Channel, 12-Bit, Serial Input, 4 mA to 20 mA |
| ADP2302_12 | 制造商:AD 制造商全称:Analog Devices 功能描述:2 A/3 A, 20 V, 700 kHz, Nonsynchronous Step-Down Regulators |
| ADP2302ARDZ | 功能描述:IC REG BUCK ADJ 2A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| ADP2302ARDZ-2.5 | 制造商:Analog Devices 功能描述: |
| ADP2302ARDZ-2.5-R7 | 功能描述:IC REG BUCK 2.5V 2A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
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