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参数资料
| 型号： | ADP1871ARMZ-0.3-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/44页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-MSOP |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 300kHz |
| 占空比： | 84% |
| 电源电压： | 2.95 V ~ 20 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | ADP1871ARMZ-0.3-R7DKR |
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Synchronous Buck Controller with
C onstant On-Time and Valley Current Mode
Data Sheet
FEATURES
Power input voltage range: 2.95 V to 20 V
On-board bias regulator
TYPICAL APPLICATIONS CIRCUIT
V IN = 2.95V TO 20V
Minimum output voltage: 0.6 V
0.6 V reference voltage with ±1.0% accuracy
Supports all N-channel MOSFET power stages
Available in 300 kHz, 600 kHz, and 1.0 MHz options
No current-sense resistor required
V OUT
R TOP
C C
R C
R BOT
C C2
VIN
ADP1870/
ADP1871
COMP/EN BST
FB DRVH
GND SW
C BST
C IN
Q1
L
C OUT
V OUT
Power saving mode (PSM) for light loads (ADP1871 only)
Resistor-programmable current-sense gain
Thermal overload protection
Short-circuit protection
C VREG2
C VREG
VREG DRVL
PGND
R RES
Q2
LOAD
Precision enable input
Integrated bootstrap diode for high-side drive
Figure 1.
Starts into a precharged load
Small, 10-lead MSOP and LFCSP packages
APPLICATIONS
Telecom and networking systems
100
95
90
85
80
75
V IN = 5V (PSM)
Mid to high end servers
Set-top boxes
DSP core power supplies
70
65
60
55
V IN = 13V (PSM)
V IN = 16.5V
V IN = 13V
V OUT = 1.8V
f SW = 300kHz
744325120, L = 1.2μH, DCR = 1.8mΩ
30
12 V input POL supplies
GENERAL DESCRIPTION
The ADP1870/ADP1871 are versatile current-mode, synchronous
step-down controllers that provide superior transient response,
optimal stability, and current-limit protection by using a constant
on-time, pseudo-fixed frequency with a programmable current-
limit, current-control scheme. In addition, these devices offer
50 T A = 25°C
45
40 V IN = 16.5V (PSM)
WüRTH INDUCTOR:
35
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
25
10 100 1k 10k
LOAD CURRENT (mA)
Figure 2. Efficiency vs. Load Current (V OUT = 1.8 V, 300 kHz)
100k
optimum performance at low duty cycles by utilizing valley
current-mode control architecture. This allows the ADP1870/
ADP1871 to drive all N-channel power stages to regulate output
voltages as low as 0.6 V.
The ADP1871 is the power saving mode (PSM) version of the
device and is capable of pulse skipping to maintain output
regulation while achieving improved system efficiency at light
section for more information).
Available in three frequency options (300 kHz, 600 kHz, and
1.0 MHz, plus the PSM option), the ADP1870/ADP1871 are well
suited for a wide range of applications that require a single-input
power supply range from 2.95 V to 20 V. Low voltage biasing is
supplied via a 5 V internal LDO.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
In addition, an internally fixed soft start period is included to limit
input in-rush current from the input supply during startup and
to provide reverse current protection during soft start for a pre-
charged output. The low-side current-sense, current-gain scheme
and integration of a boost diode, along with the PSM/forced pulse-
width modulation (PWM) option, reduce the external part count
and improve efficiency.
The ADP1870/ADP1871 operate over the ?40°C to +125°C
junction temperature range and are available in a 10-lead MSOP
and LFCSP packages.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?2010–2012 Analog Devices, Inc. All rights reserved.
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参数描述 |
|---|---|
| ADP1871ARMZ-0V3-R7 | 制造商:Analog Devices 功能描述: |
| ADP1871ARMZ-0V6-R7 | 制造商:Analog Devices 功能描述: |
| ADP1871ARMZ-1.0-R7 | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| ADP1871ARMZ-1V0-R7 | 制造商:Analog Devices 功能描述: |
| ADP1871-BL1-EVZ | 功能描述:EVAL BOARD FOR ADP1871 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
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