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ADP1871-0.3-EVALZ

更新时间： 2024-11-19 06:36:23
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亚德诺 - ADI 控制器
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44页 1932K
描述
Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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ADP1871-0.3-EVALZ 数据手册

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Synchronous Buck Controller with  
Constant On-Time and Valley Current Mode  
ADP1870/ADP1871  
FEATURES  
TYPICAL APPLICATIONS CIRCUIT  
V
= 2.95V TO 20V  
IN  
Power input voltage range: 2.95 V to 20 V  
On-board bias regulator  
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  
Power saving mode (PSM) for light loads (ADP1871 only)  
Resistor-programmable current-sense gain  
Thermal overload protection  
VIN  
C
C
ADP1870/  
ADP1871  
COMP/EN BST  
C
IN  
C
C2  
R
C
R
TOP  
V
OUT  
C
Q1  
BST  
L
V
FB  
DRVH  
SW  
OUT  
R
BOT  
C
GND  
OUT  
Q2  
C
VREG2  
VREG  
DRVL  
PGND  
R
RES  
LOAD  
C
VREG  
Short-circuit protection  
Figure 1.  
Precision enable input  
Integrated bootstrap diode for high-side drive  
Starts into a precharged load  
Small, 10-lead MSOP package  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
45  
40  
35  
30  
25  
V
= 5V (PSM)  
IN  
APPLICATIONS  
Telecom and networking systems  
Mid to high end servers  
Set-top boxes  
V
= 16.5V  
IN  
V
= 13V  
IN  
DSP core power supplies  
V
= 13V (PSM)  
IN  
T
V
= 25°C  
A
= 1.8V  
OUT  
= 300kHz  
f
SW  
V
= 16.5V (PSM)  
IN  
GENERAL DESCRIPTION  
WÜRTH INDUCTOR:  
744325120, L = 1.2µH, DCR = 1.8mΩ  
INFINEON FETs:  
BSC042N03MS G (UPPER/LOWER)  
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  
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.  
10  
100  
1k  
10k  
100k  
LOAD CURRENT (mA)  
Figure 2. Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)  
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 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  
loads (see the Power Saving Mode (PSM) Version (ADP1871)  
section for more information).  
The ADP1870/ADP1871 operate over the −40°C to +125°C  
junction temperature range and are available in a 10-lead MSOP  
package.  
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. 0  
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 registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2010 Analog Devices, Inc. All rights reserved.  
 
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