Datasheet ADP2105, ADP2106, ADP2107 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 2 Amp Synchronous, Step-Down DC-to-DC Converter |
| 页数 / 页 | 36 / 1 — 1 A/1.5 A/2 A Synchronous,. Step-Down DC-to-DC Converters. Data Sheet. … |
| 修订版 | E |
| 文件格式/大小 | PDF / 1.0 Mb |
| 文件语言 | 英语 |
1 A/1.5 A/2 A Synchronous,. Step-Down DC-to-DC Converters. Data Sheet. ADP2105/. ADP2106/. ADP2107. FEATURES. GENERAL DESCRIPTION
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1 A/1.5 A/2 A Synchronous, Step-Down DC-to-DC Converters Data Sheet ADP2105/ ADP2106/ ADP2107 FEATURES GENERAL DESCRIPTION Extremely high 97% efficiency
The ADP2105/ADP2106/ADP2107 are low quiescent current,
Ultralow quiescent current: 20 μA
synchronous, step-down dc-to-dc converters in a compact 4 mm ×
1.2 MHz switching frequency
4 mm LFCSP package. At medium to high load currents, these
0.1 μA shutdown supply current
devices use a current mode, constant frequency pulse-width
Maximum load current
modulation (PWM) control scheme for excellent stability and
ADP2105: 1 A
transient response. To ensure the longest battery life in portable
ADP2106: 1 .5 A
applications, the ADP2105/ADP2106/ADP2107 use a pulse
ADP2107: 2 A
frequency modulation (PFM) control scheme under light load
Input voltage: 2.7 V to 5.5 V
conditions that reduces switching frequency to save power.
Output voltage: 0.8 V to VIN
The ADP2105/ADP2106/ADP2107 run from input voltages of
Maximum duty cycle: 100%
2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple
Smoothly transitions into low dropout (LDO) mode
alkaline/NiMH cells, PCMCIA, and other standard power sources.
Internal synchronous rectifier
The output voltage of ADP2105/ADP2106/ADP2107 is adjustable
Small 16-lead 4 mm × 4 mm LFCSP package
from 0.8 V to the input voltage (indicated by ADJ), whereas the
Optimized for small ceramic output capacitors
ADP2105/ADP2106/ADP2107 are available in preset output
Enable/shutdown logic input
voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x V).
Undervoltage lockout
Each of these variations is available in three maximum current
Soft start
levels: 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107).
Supported by ADIsimPower™ design tool
The power switch and synchronous rectifier are integrated for
APPLICATIONS
minimal external part count and high efficiency. During logic
Mobile handsets
controlled shutdown, the input is disconnected from the output,
PDAs and palmtop computers
and it draws less than 0.1 µA from the input source. Other key
Telecommunication/networking equipment
features include undervoltage lockout to prevent deep battery
Set top boxes
discharge and programmable soft start to limit inrush current at
Audio/video consumer electronics
startup.
TYPICAL OPERATING CIRCUIT 100 VOUT = 2.5V 0.1μF VIN = 3.3V VIN = 3.6V V 10Ω IN INPUT VOLTAGE = 2.7V TO 5.5V 10μF 95 FB %) 16 15 14 13 ( 90 FB GND IN PWIN1 ON NCY OUTPUT VOLTAGE = 2.5V E V OFF 1 EN LX2 12 IN = 5V ICI 2μH F F 85 E 2 GND PGND 11 ADP2107-ADJ 10μF 4.7μF 85kΩ 3 GND LX1 10 80 FB VIN 40kΩ
001
4 GND PWIN2 9 LOAD
06079-
COMP SS AGND NC 75 0A TO 2A 0 200 400 600 800 1000 1200 1400 1600 1800 2000 5 6 7 8 10μF LOAD CURRENT (mA) 1nF 70kΩ
Figure 2. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V
120pF
002
NC = NO CONNECT
06079- Figure 1. Circuit Configuration of ADP2107 with VOUT = 2.5 V
Rev. E Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2006–2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL OPERATING CIRCUIT REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE BOUNDARY CONDITION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL SCHEME PWM MODE OPERATION PFM MODE OPERATION PULSE-SKIPPING THRESHOLD 100% DUTY CYCLE OPERATION (LDO MODE) DESIGN FEATURES Enable/Shutdown Synchronous Rectification Current Limit Short-Circuit Protection Undervoltage Lockout (UVLO) Thermal Protection Soft Start APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL EXTERNAL COMPONENT SELECTION SETTING THE OUTPUT VOLTAGE INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION INPUT CAPACITOR SELECTION INPUT FILTER SOFT START PERIOD LOOP COMPENSATION BODE PLOTS LOAD TRANSIENT RESPONSE EFFICIENCY CONSIDERATIONS Power Switch Conduction Losses Inductor Losses Switching Losses Transition Losses THERMAL CONSIDERATIONS DESIGN EXAMPLE EXTERNAL COMPONENT RECOMMENDATIONS CIRCUIT BOARD LAYOUT RECOMMENDATIONS EVALUATION BOARD EVALUATION BOARD SCHEMATIC FOR ADP2107 (1.8 V) RECOMMENDED PCB LAYOUT (EVALUATION BOARD LAYOUT) APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE
The ADP2105/ADP2106/ADP2107 are low quiescent current,
Ultralow quiescent current: 20 μA
synchronous, step-down dc-to-dc converters in a compact 4 mm ×
1.2 MHz switching frequency
4 mm LFCSP package. At medium to high load currents, these
0.1 μA shutdown supply current
devices use a current mode, constant frequency pulse-width
Maximum load current
modulation (PWM) control scheme for excellent stability and
ADP2105: 1 A
transient response. To ensure the longest battery life in portable
ADP2106: 1 .5 A
applications, the ADP2105/ADP2106/ADP2107 use a pulse
ADP2107: 2 A
frequency modulation (PFM) control scheme under light load
Input voltage: 2.7 V to 5.5 V
conditions that reduces switching frequency to save power.
Output voltage: 0.8 V to VIN
The ADP2105/ADP2106/ADP2107 run from input voltages of
Maximum duty cycle: 100%
2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple
Smoothly transitions into low dropout (LDO) mode
alkaline/NiMH cells, PCMCIA, and other standard power sources.
Internal synchronous rectifier
The output voltage of ADP2105/ADP2106/ADP2107 is adjustable
Small 16-lead 4 mm × 4 mm LFCSP package
from 0.8 V to the input voltage (indicated by ADJ), whereas the
Optimized for small ceramic output capacitors
ADP2105/ADP2106/ADP2107 are available in preset output
Enable/shutdown logic input
voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x V).
Undervoltage lockout
Each of these variations is available in three maximum current
Soft start
levels: 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107).
Supported by ADIsimPower™ design tool
The power switch and synchronous rectifier are integrated for
APPLICATIONS
minimal external part count and high efficiency. During logic
Mobile handsets
controlled shutdown, the input is disconnected from the output,
PDAs and palmtop computers
and it draws less than 0.1 µA from the input source. Other key
Telecommunication/networking equipment
features include undervoltage lockout to prevent deep battery
Set top boxes
discharge and programmable soft start to limit inrush current at
Audio/video consumer electronics
startup.
TYPICAL OPERATING CIRCUIT 100 VOUT = 2.5V 0.1μF VIN = 3.3V VIN = 3.6V V 10Ω IN INPUT VOLTAGE = 2.7V TO 5.5V 10μF 95 FB %) 16 15 14 13 ( 90 FB GND IN PWIN1 ON NCY OUTPUT VOLTAGE = 2.5V E V OFF 1 EN LX2 12 IN = 5V ICI 2μH F F 85 E 2 GND PGND 11 ADP2107-ADJ 10μF 4.7μF 85kΩ 3 GND LX1 10 80 FB VIN 40kΩ
001
4 GND PWIN2 9 LOAD
06079-
COMP SS AGND NC 75 0A TO 2A 0 200 400 600 800 1000 1200 1400 1600 1800 2000 5 6 7 8 10μF LOAD CURRENT (mA) 1nF 70kΩ
Figure 2. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V
120pF
002
NC = NO CONNECT
06079- Figure 1. Circuit Configuration of ADP2107 with VOUT = 2.5 V
Rev. E Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2006–2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL OPERATING CIRCUIT REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE BOUNDARY CONDITION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL SCHEME PWM MODE OPERATION PFM MODE OPERATION PULSE-SKIPPING THRESHOLD 100% DUTY CYCLE OPERATION (LDO MODE) DESIGN FEATURES Enable/Shutdown Synchronous Rectification Current Limit Short-Circuit Protection Undervoltage Lockout (UVLO) Thermal Protection Soft Start APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL EXTERNAL COMPONENT SELECTION SETTING THE OUTPUT VOLTAGE INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION INPUT CAPACITOR SELECTION INPUT FILTER SOFT START PERIOD LOOP COMPENSATION BODE PLOTS LOAD TRANSIENT RESPONSE EFFICIENCY CONSIDERATIONS Power Switch Conduction Losses Inductor Losses Switching Losses Transition Losses THERMAL CONSIDERATIONS DESIGN EXAMPLE EXTERNAL COMPONENT RECOMMENDATIONS CIRCUIT BOARD LAYOUT RECOMMENDATIONS EVALUATION BOARD EVALUATION BOARD SCHEMATIC FOR ADP2107 (1.8 V) RECOMMENDED PCB LAYOUT (EVALUATION BOARD LAYOUT) APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE