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ADP1875 Datasheet(PDF) 1 Page - Analog Devices

No. de pieza ADP1875
Descripción Electrónicos  Synchronous Buck Controller with Constant On-Time and Valley Current Mode
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ADP1875 Datasheet(HTML) 1 Page - Analog Devices

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Synchronous Buck Controller with Constant
On-Time and Valley Current Mode
ADP1874/ADP1875
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2011 Analog Devices, Inc. All rights reserved.
FEATURES
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 (ADP1875 only)
Resistor programmable current limit
Power good with internal pull-up resistor
Externally programmable soft start
Thermal overload protection
Short-circuit protection
Standalone precision enable input
Integrated bootstrap diode for high-side drive
Starts into a precharged output
Available in a 16-lead QSOP package
APPLICATIONS
Telecom and networking systems
Mid- to high-end servers
Set-top boxes
DSP core power supplies
GENERAL DESCRIPTION
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.
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).
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).
TYPICAL APPLICATIONS CIRCUIT
COMP
BST
FB
DRVH
GND
SW
VREG
VREG_IN
RES
DRVL
SS
CSS
PGND
VIN
CC
CVREG
CVREG2
CC2
RC
RBOT
RTOP
VOUT
EN
10kΩ
VREG
Q1
Q2
L
COUT
VOUT
CBST
LOAD
CIN
VIN = 2.95V TO 20V
ADP1874/
ADP1875
RRES
RTRK1
PGOOD
RPGD
VEXT
TRACK
RTRK2
VMASTER
Figure 1. Typical Applications Circuit
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
10
100
1k
10k
100k
LOAD CURRENT (mA)
TA = 25°C
VOUT = 1.8V
fSW = 300kHz
WÜRTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8mΩ
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
VIN = 5V (PSM)
VIN = 13V (PSM)
VIN = 16.5V (PSM)
VIN = 13V
VIN = 16.5V
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 ADP1874/ADP1875 operate over the −40°C to +125°C
junction temperature range and are available in a 16-lead QSOP
package.


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