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ADP1864 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ADP1864
기능 Constant Frequency Current-Mode Step-Down DC/DC Controller
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ADP1864 데이터시트, 핀배열, 회로
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Constant Frequency Current-Mode
Step-Down DC/DC Controller in TSOT
ADP1864
FEATURES
Wide input voltage range: 3.15 V to 14 V
Wide output voltage range: 0.8 V to input voltage
Pin-to-pin compatible with LTC1772, LTC3801
Up to 94% efficiency
0.8 V ±1.25% reference accuracy over temperature
Internal soft start
100% duty cycle for low dropout voltage
Current-mode operation for good line and load transient
response
7 μA shutdown current
235 μA quiescent supply current
Short-circuit and overvoltage protection
Small 6-lead TSOT package
APPLICATIONS
Wireless devices
1- to 3-cell Li-Ion battery-powered applications
Set-top boxes
Processor core power supplies
Hard disk drives
GENERAL DESCRIPTION
The ADP1864 is a compact, inexpensive, constant-frequency
current-mode step-down DC-to-DC controller. The ADP1864
drives a P-channel MOSFET that regulates an output voltage as
low as 0.8 V with ±2% accuracy, for up to 5 A load currents,
from input voltages as high as 14 V.
The ADP1864 provides system flexibility by allowing accurate
setting of the current limit with an external resistor, while the
output voltage is easily adjustable using two external resistors.
The ADP1864 includes an internal soft start to allow quick
power-up while preventing input inrush current. Additional
safety features include short-circuit protection, output over-
voltage protection, and input under voltage protection.
Current-mode control provides fast and stable load transient
performance, while the 580 kHz operating frequency allows a
small inductor to be used in the system. To further the life of a
battery source, the controller turns on the external P-channel
MOSFET 100% of the duty cycle in dropout.
The ADP1864 operates over the −40°C to +85°C temperature
range and is available in a small, low profile, 6-lead TSOT
package.
470pF
ADP1864
15kΩ
1 COMP
IN 5
2 GND
CS 4
80.6kΩ
3 FB
PGATE 6
174kΩ
0.03Ω
VIN = 3.3V to 10V
10μF
5μH 2.5V, 2.0A
47μF
Figure 1. Typical Applications Diagram
MOSFET = FDC638P
100
VOUT = 2.5V
95
90
85
3.3V
80
75
4.2V
70
65 5.0V
60
0.01
0.1 1.0
EFFICIENCY vs. LOAD CURRENT FOR APPLICATION
10.0
Figure 2. Efficiency vs. Load Current
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
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 Analog Devices, Inc. All rights reserved.




ADP1864 pdf, 반도체, 판매, 대치품
ADP1864
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
IN to GND
CS, PGATE to GND
FB, COMP to GND
θJA 2-Layer (SEMI Standard Board)
θJA 4-Layer (JEDEC Standard Board)
Operating Ambient Temperature
Operating Junction Temperature
Storage Temperature
Lead Temperature Range
Rework Temperature (J-STD-020B)
Peak Reflow Temperature
(20 sec to 40 sec, J-STD-020B)
Rating
−0.3 V to +16 V
−0.3 V to (VIN + 0.3 V)
−0.3 V to +6 V
315°C/W
186°C/W
−40°C to +85°C
−55°C to +125°C
−65°C to +150°C
260°C
260°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 4 of 16

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ADP1864 전자부품, 판매, 대치품
12
11
10
VIN = 16V
9
8
7 VIN = 5V
6
5
–40 –20
VIN = 4V
VIN = 3.15V
0 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 10. ISD vs. VIN
310 16V
290
12V
7V
270
250 5V
230 4V
3.1V
210
190
–40 –20
0
20 40 60 80 100 120
TEMPERATURE (°C)
Figure 11. IQ vs. VIN
ADP1864
650
640
630
620
610
600
590
580
570
560
550
540
530
520
510
500
3
TEMPERATURE = 25°C
579
VIN (V)
11
Figure 12. Oscillator Frequency vs. VIN
13
Rev. 0 | Page 7 of 16

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ADP1864

Constant Frequency Current-Mode Step-Down DC/DC Controller

Analog Devices
Analog Devices

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