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| 型号： | ADP1823-EVAL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP1823 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.2V |
| 电流 - 输出： | 15A |
| 输入电压： | 5.5 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP1823 |
| 产品目录页面： | 791 (CN2011-ZH PDF) |
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Dual, Interleaved, Step-Down
DC-to-DC Controller with Tracking
ADP1823
FEATURES
Fixed-frequency operation: 300 kHz, 600 kHz, or
TYPICAL APPLICATION CIRCUIT
IN = 12V
synchronized operation up to 1 MHz
Supply input range: 3.7 V to 20 V
Wide power stage input range: 1 V to 24 V
Interleaved operation results in smaller, low cost input
capacitor
180μF
1μF
PV IN
TRK1
TRK2
VREG
EN1
EN2
180μF
All-N-channel MOSFET design for low cost
±0.85% accuracy at 0 ° C to 70 ° C
IRLR7807Z
0.47μF
BST1
DH1
BST2
DH2
0.47μF
IRLR7807Z
Soft start, thermal overload, current-limit protection
10 μA shutdown supply current
Internal linear regulator
Lossless R DSON current-limit sensing
Reverse current protection during soft start for handling
precharged outputs
1.2V,
6A
560μF
2.2μH
2k ?
2k ?
IRFR3709Z
ADP1823
SW1 SW2
CSL1 CSL2
DL2
DL1
PGND2
2k ?
IRFR3709Z
2.2μH
2k ?
1.8V,
8A
560μF
PGND1
Independent Power OK (POK) outputs
Voltage tracking for sequencing or DDR termination
Available in 5 mm × 5 mm, 32-lead LFCSP
390pF
FB1 COMP2
FB2
390pF
1k ?
APPLICATIONS
2k ?
COMP1
FREQ
3900pF 4.53k ?
Telecommunications and networking systems
Medical imaging systems
Base station power
Set-top boxes
4.53k ? 3900pF
GND
LDOSD
SYNC
Printers
DDR termination
GENERAL DESCRIPTION
The ADP1823 is a versatile, dual, interleaved, synchronous,
PWM buck controller that generates two independent output
rails from an input of 3.7 V to 20 V, with a power input voltage
that ranges from 1 V to 24 V. Each controller 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 two channels operate 180 ° out of phase, reducing stress on
the input capacitor and allowing smaller, low cost components.
The ADP1823 is ideal for a wide range of high power applications,
such as DSP and processor core I/O power, and general-purpose
power in telecommunications, medical imaging, PCs, gaming,
and industrial applications.
Figure 1.
The ADP1823 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
also be synchronized to an external clock to achieve switching
frequencies between 300 kHz and 1 MHz. The ADP1823 includes
soft start protection to prevent 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 using external MOSFET sensing.
For applications requiring power supply sequencing, the
ADP1823 also provides tracking inputs that allow the output
voltages to track during startup, shutdown, and faults. This
feature can also be used to implement DDR memory bus
termination.
The ADP1823 is specified over the ?40°C to +125°C junction
temperature range and is available in a 32-lead LFCSP.
Rev. D
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 ?2006–2007 Analog Devices, Inc. All rights reserved.
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