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ADP1821ARQZ-R7

Description
DC/DC Cntrlr Dual-OUT Step Down 1200kHz 16-Pin QSOP T/R
CategoryPower/power management    The power supply circuit   
File Size383KB,24 Pages
ManufacturerADI
Websitehttps://www.analog.com
Environmental Compliance
Download Datasheet Download user manual Parametric View All

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ADP1821ARQZ-R7 Overview

DC/DC Cntrlr Dual-OUT Step Down 1200kHz 16-Pin QSOP T/R

ADP1821ARQZ-R7 Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Outputs2
TopologyStep Down
Output Voltage (V)0.6 to 20.4
Maximum Switching Frequency (kHz)1200
Minimum Input Voltage (V)1
Maximum Input Voltage (V)24
Operating Supply Voltage (V)1 to 24
Minimum Switching Frequency (kHz)300
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeIndustrial
PackagingTape and Reel
Supplier PackageQSOP
Pin Count16
Standard Package NameSOP
MountingSurface Mount
Package Height1.65(Max)
Package Length5(Max)
Package Width3.91(Max)
PCB changed16
Lead ShapeGull-wing
Step-Down DC-to-DC Controller
ADP1821
FEATURES
Wide power-input voltage range: 1 V to 24 V
Chip supply voltage range: 3.7 V to 5.5 V
Wide output voltage range: 0.6 V to 85% of input voltage
1% accuracy, 0.6 V reference voltage
All N-channel MOSFET design for low cost
Fixed-frequency operation 300 kHz, 600 kHz, or
synchronized operation up to 1.2 MHz
No current sense resistor required
Power-good output
Programmable soft start with reverse current protection
Soft start, thermal overload, current-limit protection
Undervoltage lockout
10 μA shutdown supply current
Small, 16-lead QSOP
GENERAL DESCRIPTION
The ADP1821 is a versatile and inexpensive, synchronous,
pulse-width-modulated (PWM), voltage-mode, step-down
controller. It drives an all N-channel power stage to regulate an
output voltage as low as 0.6 V. The ADP1821 can be configured
to provide output voltages from 0.6 V to 85% of the input
voltage and is sized to handle large MOSFETs for point-of-load
regulators.
The ADP1821 is well suited for a wide range of high power
applications, such as DSP and processor core power in telecom-
munications, medical imaging, high performance servers, and
industrial applications. It operates from a 3.7 V to 5.5 V supply
with a power input voltage ranging from 1.0 V to 24 V.
The ADP1821 operates at a pin-selectable, fixed switching
frequency of either 300 kHz or 600 kHz, minimizing external
component size and cost. For noise sensitive applications, it
can be synchronized to an external clock to achieve switching
frequencies between 300 kHz and 1.2 MHz. The ADP1821
includes soft start protection to limit the inrush current from
the input supply during startup, reverse current protection
during soft start for precharged outputs, as well as a unique
adjustable lossless current-limit scheme utilizing external
MOSFET sensing.
The ADP1821 operates over the –40°C to +125°C junction
temperature range and is available in a 16-lead QSOP.
APPLICATIONS
Telecommunications and networking systems
Set-top boxes
Printers
Servers
Medical imaging systems
Microprocessor and DSP core power supplies
Mobile communication base stations
BIAS INPUT
5V
1µF
10Ω
VCC
1µF
PVCC
+
D1
POWER INPUT
2.5V TO 20V
C
IN1
+
2.2µF
25V
C
IN2
2.2µF
25V
×2
OUTPUT
1.8V, 20A
C
OUT1
10µF +
6.3V
×2
C
OUT2
820µF
2.5V
×2
97
96
95
94
EFFICIENCY (%)
93
92
91
90
89
88
0
2
4
6
8
1.8V OUTPUT
3.3V OUTPUT
T
A
= 25°C
FREQUENCY = 300kHz
ADP1821
SHDN
BST
DH
SW
CSL
DL
PGND
SS
GND FB
0.47µF
100kΩ
FREQ
SYNC
PWGD
COMP
4.7kΩ
M1
L1 = 1µH
3.3kΩ
M2
M3
300Ω
10nF
2kΩ
1.5nF
6.8nF 100nF
AGND
C
IN1
: MURATA, GRM31MR71E225k
M1: IRLR7807Z
M2, M3: IRFR3709Z
D1: VISHAY BAT54
1kΩ
05310-001
C
IN2
: SANYO, OSCON 20SP180M
C
OUT2
: SANYO, OSCON 2R5SEPC820M
L1: COILTRONICS, HC7-1R0
10
12
14
16
LOAD CURRENT (A)
Figure 1. Typical Operating Circuit
Figure 2. Efficiency vs. Load Current, 5 V Input
Rev. C
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.
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 ©2005–2007 Analog Devices, Inc. All rights reserved.
05310-002
f
SW
= 300kHz
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