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ADP1874ARQZ-1.0-R7

更新时间： 2024-11-19 08:19:35
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亚德诺 - ADI 控制器
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44页 2455K
描述
Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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ADP1874ARQZ-1.0-R7 数据手册

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Synchronous Buck Controller with Constant  
On-Time and Valley Current Mode  
ADP1874/ADP1875  
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  
VIN  
C
C
ADP1874/  
ADP1875  
C
IN  
C
C2  
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  
R
C
COMP  
BST  
DRVH  
SW  
C
Q1  
BST  
10kΩ  
L
VREG  
EN  
FB  
V
R
OUT  
TOP  
V
OUT  
C
Q2  
OUT  
R
LOAD  
BOT  
Power saving mode (PSM) for light loads (ADP1875 only)  
Resistor programmable current limit  
Power good with internal pull-up resistor  
Externally programmable soft start  
Thermal overload protection  
GND  
DRVL  
C
VREG2  
R
PGD  
VREG  
PGOOD  
V
EXT  
C
VREG  
VREG_IN  
RES  
SS  
C
SS  
R
TRK2  
R
RES  
TRACK  
PGND  
V
MASTER  
R
TRK1  
Short-circuit protection  
Standalone precision enable input  
Integrated bootstrap diode for high-side drive  
Starts into a precharged output  
Figure 1. Typical Applications Circuit  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
45  
40  
35  
30  
25  
Available in a 16-lead QSOP package  
V
= 5V (PSM)  
IN  
APPLICATIONS  
Telecom and networking systems  
Mid- to high-end servers  
Set-top boxes  
V
= 16.5V  
IN  
V
= 13V  
DSP core power supplies  
IN  
V
= 13V (PSM)  
IN  
GENERAL DESCRIPTION  
T
= 25°C  
A
V
= 1.8V  
OUT  
= 300kHz  
The ADP1874/ADP1875 are versatile current mode, synchronous  
step-down controllers. They 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 using a valley, current  
mode control architecture. This allows the ADP1874/ADP1875  
to drive all N-channel power stages to regulate output voltages  
to as low as 0.6 V.  
f
SW  
V
= 16.5V (PSM)  
IN  
WÜRTH INDUCTOR:  
744325120, L = 1.2µH, DCR = 1.8mꢀ  
INFINEON FETs:  
BSC042N03MS G (UPPER/LOWER)  
10  
100  
1k  
10k  
100k  
LOAD CURRENT (mA)  
Figure 2. ADP1874/ADP1875 Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)  
In addition, soft start programmability is included to limit input in-  
rush current from the input supply during startup and to  
provide reverse current protection during precharged output  
conditions. 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 ADP1875 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 ADP1875 Power Saving Mode (PSM) section for  
more information).  
The ADP1874/ADP1875 operate over the −40°C to +125°C  
junction temperature range and are available in a 16-lead QSOP  
package.  
Available in three frequency options (300 kHz, 600 kHz, and  
1.0 MHz, plus the PSM option), the ADP1874/ADP1875 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 low dropout regulator (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  
©2011 Analog Devices, Inc. All rights reserved.  
 
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