ANALOG DEVICES ADP2105, ADP2106, ADP2107 Service Manual
查询ADP2105供应商查询ADP2105供应商
1 Amp/1.5 Amp/2 Amp Synchronous,
FEATURES
Extremely high 97% efficiency
Ultralow quiescent current: 20 μA
1.2 MHz switching frequency
0.1 μA shutdown supply current
Maximum load current:
ADP2105: 1 A
ADP2106: 1.5 A
ADP2107: 2 A
Input voltage: 2.7 V to 5.5 V
Output voltage: 0.8 V to V
Maximum duty cycle: 100%
Smoothly transitions into low dropout (LDO) mode
Internal synchronous rectifier
Small 16-lead 4 mm × 4 mm LFCSP_VQ package
Optimized for small ceramic output capacitors
Enable/shutdown logic input
Undervoltage lockout
Soft start
APPLICATIONS
Mobile handsets
PDAs and palmtop computers
Telecommunication/networking equipment
Set top boxes
Audio/video consumer electronics
TYPICAL PERFORMANCE CHARACTERISTICS
100
VIN=3.3V
95
90
VIN=5V
85
EFFICIENCY (%)
80
75
0 2000
200 400 600 800 1000 1200 1400 1600 1800
Figure 1. Efficiency vs. Load Current for the ADP2107 with V
IN
VIN=3.6V
LOAD CURRENT (mA)
V
OUT
=2.5V
= 2.5 V
OUT
Step-Down DC-to-DC Converters
ADP2105/ADP2106/ADP2107
GENERAL DESCRIPTION
The ADP2105/ADP2106/ADP2107 are low quiescent current,
synchronous, step-down dc-to-dc converters in a compact 4 mm ×
4 mm LFCSP_VQ package. At medium to high load currents,
these devices use a current-mode, constant-frequency pulsewidth modulation (PWM) control scheme for excellent stability
and transient response. To ensure the longest battery life in
portable applications, the ADP2105/ADP2106/ADP2107 use a
pulse frequency modulation (PFM) control scheme under light
load conditions that reduces switching frequency to save power.
The ADP2105/ADP2106/ADP2107 run from input voltages of
2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple
alkaline/NiMH cells, PCMCIA, and other standard power sources.
The output voltage of ADP2105/ADP2106/ADP2107-ADJ is
adjustable from 0.8 V to the input voltage, whereas the
ADP2105/ADP2106/ADP2107-xx are available in preset output
voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V. Each of these
variations is available in three maximum current levels, 1 A
(ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107). The power
switch and synchronous rectifier are integrated for minimal
external part count and high efficiency. During logic-controlled
shutdown, the input is disconnected from the output, and it
draws less than 0.1 µA from the input source. Other key features
include undervoltage lockout to prevent deep battery discharge
and programmable soft start to limit inrush current at startup.
TYPICAL OPERATING CIRCUIT
0.1F
FB
16 15 14 13
FB PWIN1
ON
OFF
06079-001
1
2
3
4
120pF
GND
EN
GND
ADP2107-ADJ
GND
GND
SS
COMP
5 6 7 8
70k
AGND
1nF
Figure 2. Circuit Configuration of ADP2107 with V
VININPUT VOLTAGE = 2.7V TO 5.5V
10
10F
IN
LX2
PGND
LX1
PWIN2
NC
OUTPUT VOLTAGE = 2.5V
12
2H
11
85k
10
FB
V
IN
40k
9
10F
NC = NO CONNECT
10F
OUT
4.7F
LOAD
0A TO 2A
= 2.5 V
06079-002
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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.
ADP2105/ADP2106/ADP2107
TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Performance Characteristics ............................................. 1
Typical Operating Circuit................................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
Boundary Condition .................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 13
Control Scheme .......................................................................... 13
PWM Mode Operation.............................................................. 13
PFM Mode Operation................................................................ 13
Pulse-Skipping Threshold......................................................... 13
100% Duty Cycle Operation (LDO Mode)............................. 13
Slope Compensation .................................................................. 14
Features........................................................................................ 14
Applications Information .............................................................. 16
External Component Selection ................................................ 16
Setting the Output Voltage........................................................ 16
Inductor Selection...................................................................... 17
Output Capacitor Selection....................................................... 18
Input Capacitor Selection.......................................................... 18
Input Filter................................................................................... 19
Soft Start ...................................................................................... 19
Loop Compensation .................................................................. 19
Bode Plots.................................................................................... 20
Load Transient Response .......................................................... 21
Efficiency Considerations ......................................................... 22
Thermal Considerations............................................................ 22
Design Example.......................................................................... 23
External Component Recommendations.................................... 24
Circuit Board Layout Recommendations ................................... 26
Evaluation Board............................................................................ 27
Evaluation Board Schematic (ADP2107-1.8V)...................... 27
Recommended PCB Board Layout
(Evaluation Board Layout)........................................................ 27
Application Circuits ....................................................................... 29
Outline Dimensions....................................................................... 31
Ordering Guide .......................................................................... 31
REVISION HISTORY
3/07—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Output Characteristics and
LX (Switch Node) Characteristics Sections .................................. 3
Changes to Typical Performance Characteristics Section........... 7
Changes to Load Transient Response Section ............................ 21
7/06—Revision 0: Initial Version
Rev. A | Page 2 of 32
ADP2105/ADP2106/ADP2107
SPECIFICATIONS
VIN = 3.6 V @ TA = 25°C, unless otherwise noted.1 Bold values indicate −40°C ≤ TJ ≤ +125°C.
Table 1.
Parameter Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Input Voltage Range
Undervoltage Lockout Threshold VIN rising
V
Undervoltage Lockout Hysteresis
2
IN
falling
2.7 5.5
2.2
2.0
2.4
2.2
200
2.6
2.5
OUTPUT CHARACTERISTICS
Output Regulation Voltage ADP210x-3.3, load = 10 mA 3.267 3.3 3.333 V
ADP210x-3.3, VIN = 3.6 V to 5.5 V, no load to full load
3.201
3.3
3.399
ADP210x-1.8, load = 10 mA 1.782 1.8 1.818 V
ADP210x-1.8, VIN = 2.7 V to 5.5 V, no load to full load
1.746
1.8
1.854
ADP210x-1.5, load = 10 mA 1.485 1.5 1.515 V
ADP210x-1.5, VIN = 2.7 V to 5.5 V, no load to full load
1.455
1.5
1.545
ADP210x-1.2, load = 10 mA 1.188 1.2 1.212 V
ADP210x-1.2, VIN = 2.7 V to 5.5 V, no load to full load
Load Regulation ADP2105
ADP2106
ADP2107
Line Regulation
3
ADP2105, measured in servo loop
1.164
1.2
0.4
0.5
0.6
1.236
0.1 0.33 %/V
ADP2106 and ADP2107, measured in servo loop 0.1 0.3 %/V
Output Voltage Range ADP210x-ADJ 0.8 VIN V
FEEDBACK CHARACTERISTICS
OUT_SENSE Bias Current
ADP210x-1.2 3
ADP210x-1.5 4
ADP210x-1.8 5
ADP210x-3.3 10
FB Regulation Voltage ADP210x-ADJ
FB Bias Current ADP210x-ADJ
0.784
−0.1
INPUT CURRENT CHARACTERISTICS
IN Operating Current ADP210x-ADJ, VFB = 0.9 V 20
ADP210x-xx, output voltage 10% above regulation voltage 20
IN Shutdown Current
5
VEN = 0 V 0.1 1 µA
LX (SWITCH NODE) CHARACTERISTICS
LX On Resistance
4
P-channel switch, ADP2105 190
P-channel switch, ADP2106 and ADP2107 100
N-channel synchronous rectifier, ADP2105 160
N-channel synchronous rectifier, ADP2106 and ADP2107 90
LX Leakage Current
LX Peak Current Limit
P-channel switch, ADP2106
P-channel switch, ADP2105
LX Minimum On-Time
ENABLE CHARACTERISTICS
EN Input High Voltage VIN = 2.7 V to 5.5 V
EN Input Low Voltage VIN = 2.7 V to 5.5 V
EN Input Leakage Current VIN = 5.5 V, VEN = 0 V, 5.5 V
OSCILLATOR FREQUENCY VIN = 2.7 V to 5.5 V
4, 5
4
P-channel switch, ADP2107
2.6
2.0
1.3
VIN = 5.5 V, VLX = 0 V, 5.5 V 0.1 1 µA
4
In PWM mode of operation, VIN = 5.5 V
2
0.4
−1 −0.1 +1
1
0.8
2.9
2.25
1.5
1.2
6
8
10
20
0.816
+0.1
30
30
270
165
230
140
3.3
2.6
1.8
100
1.4
SOFT START PERIOD CSS = 1 nF 750 1000 1200 µs
V
V
V
mV
V
V
V
V
%/A
%/A
%/A
µA
µA
µA
µA
V
µA
µA
µA
mΩ
mΩ
mΩ
mΩ
A
A
A
ns
V
V
µA
MHz
Rev. A | Page 3 of 32
ADP2105/ADP2106/ADP2107
Parameter Conditions Min Typ Max Unit
THERMAL CHARACTERISTICS
Thermal Shutdown Threshold 140
Thermal Shutdown Hysteresis 40
COMPENSATOR TRANSCONDUCTANCE (Gm) 50 µA/V
2
CURRENT SENSE AMPLIFIER GAIN (GCS)
ADP2105 1.875 A/V
ADP2106 2.8125 A/V
ADP2107 3.625 A/V
1
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). Typical values are at TA = 25°C.
2
Guaranteed by design.
3
The ADP2015/ADP2106/ADP2107 line regulation was measured in a servo loop on the ATE that adjusts the feedback voltage to achieve a specific comp voltage.
4
All LX (switch node) characteristics are guaranteed only when the LX1 and LX2 pins are tied together.
5
These specifications are guaranteed from −40°C to +85°C.
°C
°C
Rev. A | Page 4 of 32
ADP2105/ADP2106/ADP2107
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
IN, EN, SS, COMP, OUT_SENSE/FB to
AGND
LX1, LX2 to PGND −0.3 V to (VIN + 0.3 V)
PWIN1, PWIN2 to PGND −0.3 V to +6 V
PGND to AGND −0.3 V to +0.3 V
GND to AGND −0.3 V to +0.3 V
PWIN1, PWIN2 to IN −0.3 V to +0.3 V
Operating Junction Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Soldering Conditions JEDEC J-STD-020
−0.3 V to +6 V
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type θ
16-Lead LFCSP_VQ/QFN 40 °C/W
Maximum Power Dissipation 1 W
JA
Unit
BOUNDARY CONDITION
Natural convection, 4-layer board, exposed pad soldered to the PCB.
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
Rev. A | Page 5 of 32
ADP2105/ADP2106/ADP2107
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
15 GND
16 OUT_SENSE/FB
14 IN
13 PWIN1
PIN 1
EN
GND
GND
GND
1
2
3
4
INDICATOR
ADP2105/
ADP2106/
ADP2107
TOP VIEW
(Not to Scale)
6
5
7
SS
AGND
COMP
NC = NO CONNECT
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Mnemonic
Pin No. ADP210x-xx ADP210x-ADJ Description
1 EN EN
Enable Input. Drive EN high to turn on the ADP2105/ADP2106/ADP2107. Drive EN low to turn
it off and reduce the input current to 0.1 μA.
2, 3, 4,
15
GND GND
Test Pins. These pins are used by Analog Devices, Inc. for internal testing and are not ground
return pins. Tie these pins to the AGND plane as close to the ADP2105/ADP2106/ADP2107 as
possible.
5 COMP COMP
Feedback Loop Compensation Node. COMP is the output of the internal transconductance
error amplifier. Place a series RC network from COMP to AGND to compensate the converter.
See the Loop Compensation section.
6 SS SS
Soft Start Input. Place a capacitor from SS to AGND to set the soft start period. A 1 nF capacitor
sets a 1 ms soft start period.
7 AGND AGND
Analog Ground. Connect the ground of the compensation components, soft start capacitor,
and the voltage divider on the FB pin to the AGND pin as close as possible to the ADP2105/
ADP2106/ADP2107. Also connect AGND to the exposed pad of ADP2105/ADP2106/ADP2107.
8 NC NC No Connect. Not internally connected. Can be connected to other pins or left unconnected.
9, 13
PWIN2,
PWIN1
PWIN2, PWIN1
Power Source Inputs. The source of the PFET high-side switch. Bypass each PWIN pin to the nearest
PGND plane with a 4.7 μF or greater capacitor as close as possible to the ADP2105/ADP2106/
ADP2107. See the Input Capacitor Selection section.
10, 12 LX1, LX2 LX1, LX2
Switch Outputs. The drain of the P-channel power switch and N-channel synchronous rectifier.
Tie the two LX pins together and connect the output LC filter between LX and the output
voltage.
11 PGND PGND
Power Ground. Connect the ground return of all input and output capacitors to PGND pin,
using a power ground plane as close as possible to the ADP2105/ADP2106/ADP2107. Also
connect PGND to the exposed pad of the ADP2105/ADP2106/ADP2107.
14 IN IN
ADP2105/ADP2106/ADP2107 Power Input. The power source for the ADP2105/ADP2106/
ADP2107 internal circuitry. Connect IN and PWIN1 with a 10 Ω resistor as close as possible to
the ADP2105/ADP2106/ADP2107. Bypass IN to AGND with a 0.1 μF or greater capacitor. See
the Input Filter section.
16 OUT_SENSE FB
Output Voltage Sense or Feedback Input. For fixed output versions, connect OUT_SENSE to the
output voltage. For adjustable versions, FB is the input to the error amplifier. Drive FB through
a resistive voltage divider to set the output voltage. The FB regulation voltage is 0.8 V.
8
NC
12 LX2
11 PGND
10 LX1
9PWIN2
6079-003
Rev. A | Page 6 of 32
ADP2105/ADP2106/ADP2107
TYPICAL PERFORMANCE CHARACTERISTICS
100
100
95
90
85
80
75
EFFICIENCY (%)
70
65
60
11
VIN = 2.7V
VIN = 5.5V
VIN = 3.6V
VIN = 4.2V
INDUCTOR: SD14, 2.5µH
DCR: 60m
T
= 25°C
A
10 100
LOAD CURRENT (mA)
06079-084
000
Figure 4. Efficiency—ADP2105 (1.2 V Output)
100
95
90
85
80
75
EFFICIENCY (%)
70
65
60
1 1000
VIN = 4.2V
10 100
LOAD CURRENT (mA)
VIN = 3.6V
VIN = 5.5V
INDUCTOR: CDRH5D18, 4. 1H
DCR: 43m
T
= 25°C
A
06079-085
Figure 5. Efficiency—ADP2105 (3.3 V Output)
100
95
90
VIN=2.7V
85
80
75
70
EFFICIENCY (%)
65
60
55
50
1 10000
VIN=3.6V
VIN=4.2V
VIN=5.5V
INDUCTOR: D62LCB, 2µH
DCR: 28m
T
= 25°C
A
10 100 1000
LOAD CURRENT (mA)
06079-062
Figure 6. Efficiency—ADP2106 (1.8 V Output)
95
90
85
80
EFFICIE NCY (%)
75
70
65
1 1000
Figure 7. Efficiency—ADP2105 (1.8 V Output)
100
95
90
VIN=3.6V
85
80
75
70
EFFICIENCY (%)
65
60
55
50
1 10000
Figure 8. Efficiency—ADP2106 (1.2 V Output)
100
95
90
85
80
VIN=4.2V
75
70
EFFICIENCY (%)
65
60
55
50
VIN=3.6V
1 10000
Figure 9. Efficiency—ADP2106 (3.3 V Output)
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
VIN = 5.5V
INDUCTOR: SD3814, 3.3µH
DCR: 93m
T
= 25°C
A
10 100
LOAD CURRENT (mA)
VIN=2.7V
VIN=4.2V
VIN=5.5V
INDUCTOR: D62LCB, 2µH
DCR: 28m
T
=25°C
A
10 100 1000
LOAD CURRENT (mA)
VIN=5.5V
INDUCTOR: D62LCB, 3.3µ H
DCR: 47m
T
= 25°C
A
10 100 1000
LOAD CURRENT (mA)
06079-086
06079-008
06079-053
Rev. A | Page 7 of 32
ADP2105/ADP2106/ADP2107
100
95
90
VIN=3.6V
85
80
75
70
EFFICIENCY (%)
65
60
55
50
1 10000
VIN=2.7V
VIN=4.2V
VIN=5.5V
INDUCTOR: SD12, 1.2µH
DCR: 37m
T
=25°C
A
10 100 1000
LOAD CURRENT (mA)
Figure 10. Efficiency—ADP2107 (1.2 V)
100
95
90
85
80
VIN=4.2V
75
70
EFFICIENCY (%)
65
60
55
50
1 10000
VIN=3.6V
10 100 1000
LOAD CURRENT (mA)
VIN=5.5V
INDUCTOR: CDRH5D28, 2.5µH
DCR: 13m
T
= 25°C
A
Figure 11. Efficiency—ADP2107 (3.3 V)
1.85
1.83
06079-010
06079-054
100
95
90
85
80
75
70
EFFICIENCY (%)
65
60
55
50
1 10000
VIN=2.7V
VIN=4.2V
10 100 1000
VIN=3.6V
VIN=5.5V
INDUCTOR: D62LCB, 1.5µ H
DCR: 21m
T
=25°C
A
LOAD CURRENT (mA)
Figure 13. Efficiency—ADP2107 (1.8 V)
1.23
2.7V, –40°C 2.7V, +25°C 2.7V, +125°C
3.6V, –40°C 3.6V, +25°C 3.6V, +125°C
5.5V, –40°C 5.5V, +25°C
1.22
1.21
1.20
1.19
OUTPUT VOLTAGE (V)
1.18
1.17
0.01 10000
0.1 1 10 100 1000
LOAD CURRENT (mA)
5.5V, +125°C
Figure 14. Output Voltage Accuracy—ADP2107 (1.2 V)
3.38
3.6V, –40°C 3.6V, +25°C 3.6V, +125°C
5.5V, –40°C 5.5V, +25°C
3.36
3.34
5.5V, + 125°C
06079-063
06079-082
1.81
1.79
OUTPUT VOLTAGE (V)
1.77
2.7V, –40°C 2.7V, +25°C 2.7V, +125°C
3.6V, –40°C 3.6V, +25°C 3.6V, +125°C
5.5V, –40°C 5.5V, +25°C
1.75
0.1 10000
1 10 100 1000
LOAD CURRENT (mA)
5.5V, +125°C
Figure 12. Output Voltage Accuracy—ADP2107 (1.8 V)
06079-064
Rev. A | Page 8 of 32
3.32
3.30
3.28
OUTPUT VOLTAGE (V)
3.26
3.24
3.22
0.01 10000
0.1 1 10 100 1000
LOAD CURRENT (mA)
Figure 15. Output Voltage Accuracy—ADP2107 (3.3 V)
06079-081
ADP2105/ADP2106/ADP2107
10000
1000
INPUT CURRENT (µ A)
0.802
0.801
0.800
0.799
0.798
0.797
FEEDBACK VOLT AGE (V)
0.796
+25°C
100
10
1
0.8
–40°C
+125°C
1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2
INPUT VOLTAGE (V)
Figure 16. Quiescent Current vs. Input Voltage
06079-016
190
180
170
160
150
140
130
NMOS SYNCHRONOUS RECTIFI ER
120
SWITCH ON RESISTANCE (m)
110
100
2.7 3.0 3.3 3.6 3.9 4.2 4.5 5.1 5.44.8
PMOS POWER SWITCH
INPUT VOLTAGE (V)
Figure 19. Switch On Resistance vs. Input Voltage—ADP2105
120
100
80
60
40
SWITCH ON RESISTANCE (m)
20
PMOS POWER SWITCH
NMOS SYNCHRONOUS RECTIFI ER
06079-093
0.795
–40 125
–20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 17. Feedback Voltage vs. Temperature
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1.40
PEAK CURRENT LIMIT (A)
1.35
1.30
1.25
2.7 5.7
3.0 3.3 3.6 3.9 4.2 4. 5 4.8 5.1 5.4
INPUT VOLTAGE (V)
ADP2105 (1A)
Figure 18. Peak Current Limit of ADP2105
TA= 25°C
06079-017
0
2.7 5.4
3.03.33.63.94.24.54.85.1
INPUT VOLTAGE (V)
TA = 25°C
06079-018
Figure 20. Switch On Resistance vs. Input Voltage—ADP2106 and ADP2107
1260
1250
1240
1230
1220
1210
SWITCHING FREQUENCY ( kHz)
1200
06079-073
1190
2.7 5.4
3.03.33.63.94.24.54.85.1
+125°C
–40°C
INPUT VOLTAGE (V)
+25°C
06079-021
Figure 21. Switching Frequency vs. Input Voltage
Rev. A | Page 9 of 32
ADP2105/ADP2106/ADP2107
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
PEAK CURRENT LIMIT (A)
1.95
1.90
1.85
2.7 5.7
3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
INPUT VOLTAGE (V)
ADP2106 (1.5A)
Figure 22. Peak Current Limit of ADP2106
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
PEAK CURRENT LIMIT (A)
2.60
2.55
2.50
2.7 5.7
3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
INPUT VOLTAGE (V)
ADP2107 (2A)
Figure 23. Peak Current Limit of ADP2107
150
135
120
105
90
75
60
V
45
30
15
PULSE-SKIP PING THRESHO LD CURRENT (mA)
0
2.7 5.7
V
= 1.2V
OUT
V
= 2.5V
= 1.8V
OUT
3.0 3.3 3.6 3.9 4.2 4. 5 4.8 5. 1 5.4
INPUT VOLTAGE (V)
OUT
TA= 25°C
TA=25°C
TA = 25°C
3
1
4
06079-072
135
120
105
90
75
60
45
30
15
06079-071
PULSE-SKIP PING THRESHO LD CURRENT (mA)
Figure 26. Pulse-Skipping Threshold vs. Input Voltage for ADP2105
195
180
165
150
135
120
105
90
75
60
45
30
15
06079-067
PULSE-SKIP PING THRESHO LD CURRENT (mA)
LX NODE (SWITCH NODE)
CH1 1V
INDUCTOR CURRENT
OUTPUT V OLTAGE
M 10µs A CH1 1.78V
45.8%CH4 1ACH3 5V
T
: 260mV
@: 3.26V
Figure 25. Short Circuit Response at Output
V
= 1.2V
OUT
V
= 1.8V
OUT
0
2.7 5.7
3.0 3.3 3.6 3.9 4.2 4. 5 4.8 5. 1 5.4
INPUT VOLTAGE (V)
0
2.7 5.7
3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
INPUT VOLTAGE (V)
V
= 2.5V
OUT
TA = 25°C
V
= 1.2V
OUT
V
= 1.8V
OUT
V
= 2.5V
OUT
TA = 25°C
06079-074
06079-066
06079-068
Figure 24. Pulse-Skipping Threshold vs. Input Voltage for ADP2106
Figure 27. Pulse-Skipping Threshold vs. Input Voltage for ADP2107
Rev. A | Page 10 of 32
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