ANALOG DEVICES ADP2107 Service Manual

1 Amp/1.5 Amp/2 Amp Synchronous,

F

www.BDTIC.com/ADI

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 OPERATING CIRCUIT

FB

16 15 14 13

FB PWIN1

ON

OFF

1

2

3

4

120pF

Figure 1. Circuit Configuration of ADP2107 with V

GND

EN

GND

ADP2107-ADJ

GND

GND

SS

COMP

5 6 7 8

70k

0.1

1nF

IN

AGND

IN

VININPUT VOLTAGE = 2.7V TO 5.5V

10

10F

OUTPUT VO LTAGE = 2.5V

12

LX2

2H

11

PGND

85k

10

LX1

PWIN2

NC

FB

V

IN

40k

9

10F

NC = NO CONNECT

10F

OUT

= 2.5 V

4.7F

LOAD

0A TO 2A

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 is adjustable
from 0.8 V to the input voltage (indicated by ADJ), whereas the
ADP2105/ADP2106/ADP2107 are available in preset output
voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x 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.

100

VIN = 3.3V

95

90

VIN = 5V

85

EFFICIENCY (%)

80

75

02

200 400 600 800 1000 1200 1400 1600 1800

VIN = 3.6V

LOAD CURRENT (mA)

Figure 2. Efficiency vs. Load Current for the ADP2107 with V

06079-002

V

OUT

= 2.5V

06079-001

000

= 2.5 V

OUT

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: [phone] www.analog.com
Fax: [phone] ©2006–2008 Analog Devices, Inc. All rights reserved.

ADP2105/ADP2106/ADP2107

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TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Typical Operating Circuit ................................................................ 1

Revision History ............................................................................... 2

Functional Block Diagram .............................................................. 3

Specifications ..................................................................................... 4

Absolute Maximum Ratings ............................................................ 6

Thermal Resistance ...................................................................... 6

Boundary Condition .................................................................... 6

ESD Caution .................................................................................. 6

Pin Configuration and Function Descriptions ............................. 7

Typical Performance Characteristics ............................................. 8

Theory of Operation ...................................................................... 14

Control Scheme .......................................................................... 14

PWM Mode Operation .............................................................. 14

PFM Mode Operation ................................................................ 14

Pulse-Skipping Threshold ......................................................... 14

100% Duty Cycle Operation (LDO Mode) ............................. 14

Slope Compensation .................................................................. 15

Design Features ........................................................................... 15

Applications Information .............................................................. 16

REVISION HISTORY

9/08—Rev. B to Rev. C

Changes to Table Summary Statement .......................................... 4

Changes to LX Minimum On-Time Parameter, Table 1 ............. 5

7/08—Rev. A to Rev. B

Changes to General Description Section ...................................... 1

Changes to Figure 3 .......................................................................... 3

Changes to Table 1 ............................................................................ 4

Changes to Table 2 ............................................................................ 6

Changes to Figure 4 .......................................................................... 7

Changes to Table 4 ............................................................................ 7

Changes to Figure 26 ...................................................................... 11

Changes to Figure 31 Through Figure 34 .................................... 12

Changes to Figure 35 ...................................................................... 13

Changes to PMW Mode Operation Section and Pulse Skipping

Threshold Section ........................................................................... 14

Changes to Slope Compensation Section .................................... 15

Changes to Setting the Output Voltage Section ........................ 16

Changes to Figure 37 ...................................................................... 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 Period .......................................................................... 19

Loop Compensation .................................................................. 19

Bode Plots .................................................................................... 20

Load Transient Response .......................................................... 21

Efficiency Considerations ......................................................... 22

Thermal Considerations ............................................................ 22

Design Example .............................................................................. 24

External Component Recommendations .................................... 25

Circuit Board Layout Recommendations ................................... 27

Evaluation Board ............................................................................ 28

Evaluation Board Schematic for ADP2107 (1.8 V) ............... 28

Recommended PCB Board Layout (Evaluation Board Layout)

....................................................................................................... 28

Application Circuits ....................................................................... 30

Outline Dimensions ....................................................................... 33

Ordering Guide .......................................................................... 33

Changes to Inductor Selection Section ........................................ 17

Changes to Input Capacitor Selection Section ........................... 18

Changes to Figure 47 through Figure 52 ..................................... 21

Changes to Transition Losses Section and Thermal

Considerations Section .................................................................. 22

Changes to Table 11 ....................................................................... 25

Changes to Circuit Board Layout Recommendations Section..27

Changes to Table 12 ....................................................................... 26

Changes to Figure 53 ...................................................................... 28

Changes to Figure 56 Through Figure 57.................................... 30

Changes to Figure 58 Through Figure 59.................................... 31

Changes to Outline Dimensions .................................................. 33

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. C | Page 2 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

FUNCTIONAL BLOCK DIAGRAM

COMP

SS

FB

FB

AGND

GND

GND

GND

NC

GND

EN

5

SOFT

6

START

16

16

7

FOR PRESET

VOLTAGE

OPTIONS ONLY

2

3

4

8

15

1

REFERENCE

SLOPE

COMPENSATION

OSCILLATOR

0.8V

GM ERROR

AMP

PWM/

PFM

CONTROL

CURRENT SENSE

AMPLI FIER

CURRENT

LIMIT

DRIVER

AND

ANTI-

SHOOT

THROUGH

ZERO CROSS
COMPARATOR

THERMAL

SHUTDOWN

14

9

13

10

12

11

IN

PWIN2

PWIN1

LX1

LX2

PGND

06079-037

Figure 3.

Rev. C | Page 3 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

SPECIFICATIONS

VIN = 3.6 V @ TA = 25°C, unless otherwise noted.1

Table 1.

Parameter Min Typ Max Unit Conditions

INPUT CHARACTERISTICS

Input Voltage Range 2.7 5.5 V −40°C ≤ TJ ≤ +125°C
Undervoltage Lockout Threshold 2.4 V VIN rising

2.2 2.6 V VIN rising, −40°C ≤ TJ ≤ +125°C

2.2 V VIN falling

2.0 2.5 V VIN falling, −40°C ≤ TJ ≤ +125°C
Undervoltage Lockout Hysteresis

OUTPUT CHARACTERISTICS

Output Regulation Voltage 3.267 3.3 3.333 V 3.3 V, load = 10 mA

3.3 V 3.3 V, VIN = 3.6 V to 5.5 V, no load to full load

3.201 3.399 V

1.782 1.8 1.818 V 1.8 V, load = 10 mA

1.8 V 1.8 V, VIN = 2.7 V to 5.5 V, no load to full load

1.746 1.854 V

1.485 1.5 1.515 V 1.5, load = 10 mA

1.5 V ADP210x-1.5 V, VIN = 2.7 V to 5.5 V, no load to full load

1.455 1.545 V

1.188 1.2 1.212 V 1.2 V, load = 10 mA

1.2 V 1.2 V, VIN = 2.7 V to 5.5 V, no load to full load

1.164 1.236 V

Load Regulation 0.4 %/A ADP2105

0.5 %/A ADP2106

0.6 %/A ADP2107
Line Regulation

3

0.1 0.33 %/V ADP2105, measured in servo loop

0.1 0.3 %/V ADP2106 and ADP2107, measured in servo loop
Output Voltage Range 0.8 VIN V ADJ

FEEDBACK CHARACTERISTICS

FB Regulation Voltage 0.8 V ADJ

0.784 0.816 V ADJ, −40°C ≤ TJ ≤ +125°C
FB Bias Current −0.1 +0.1 µA ADJ, −40°C ≤ TJ ≤ +125°C

20 µA 3.3 V output voltage, −40°C ≤ TJ ≤ +125°C

2

200 mV V

3 µA 1.2 V output voltage
6 µA 1.2 V output voltage, −40°C ≤ TJ ≤ +125°C
4 µA 1.5 V output voltage
8 µA 1.5 V output voltage, −40°C ≤ TJ ≤ +125°C
5 µA 1.8 V output voltage
10 µA 1.8 V output voltage, −40°C ≤ TJ ≤ +125°C
10 µA 3.3 V output voltage

falling

IN

3.3 V, V

−40°C ≤ T

1.8 V, V

−40°C ≤ T

= 3.6 V to 5.5 V, no load to full load,

IN

≤ +125°C

J

= 2.7 V to 5.5 V, no load to full load,

IN

≤ +125°C

J

ADP210x-1.5 V, V

−40°C ≤ T

1.2 V, V

−40°C ≤ T

≤ +125°C

J

= 2.7 V to 5.5 V, no load to full load,

IN

≤ +125°C

J

= 2.7 V to 5.5 V, no load to full load,

IN

Rev. C | Page 4 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

Parameter Min Typ Max Unit Conditions

INPUT CURRENT CHARACTERISTICS

IN Operating Current 20 µA ADP210x(ADJ), VFB = 0.9 V
30 µA ADP210x(ADJ), VFB = 0.9 V, −40°C ≤ TJ ≤ +125°C

20 µA

30 µA

IN Shutdown Current

4

0.1 1 µA V

LX (SWITCH) NODE CHARACTERISTICS

LX On Resistance

4

190 mΩ P-channel switch, ADP2105
270 mΩ P-channel switch, ADP2105, −40°C ≤ TJ ≤ +125°C
100 mΩ P-channel switch, ADP2106 and ADP2107
165 mΩ

160 mΩ N-channel synchronous rectifier, ADP2105
230 mΩ

90 mΩ N-channel synchronous rectifier, ADP2106 and ADP2107
140 mΩ

LX Leakage Current
LX Peak Current Limit

4, 5

0.1 1 µA V

5

2.9 A P-channel switch, ADP2107

2.6 3.3 A P-channel switch, ADP2107, −40°C ≤ TJ ≤ +125°C

2.25 A P-channel switch, ADP2106

2.0 2.6 A P-channel switch, ADP2106, −40°C ≤ TJ ≤ +125°C

1.5 A P-channel switch, ADP2105

1.3 1.8 A P-channel switch, ADP2105, −40°C ≤ TJ ≤ +125°C
LX Minimum On-Time 110 ns In PWM mode of operation, −40°C ≤ TJ ≤ +125°C

ENABLE CHARACTERISTICS

EN Input High Voltage 2 V VIN = 2.7 V to 5.5 V, −40°C ≤ TJ ≤ +125°C
EN Input Low Voltage 0.4 V VIN = 2.7 V to 5.5 V, −40°C ≤ TJ ≤ +125°C
EN Input Leakage Current −0.1 µA VIN = 5.5 V, VEN = 0 V, 5.5 V

−1 +1 µA VIN = 5.5 V, VEN = 0 V, 5.5 V, −40°C ≤ TJ ≤ +125°C

OSCILLATOR FREQUENCY 1.2 MHz VIN = 2.7 V to 5.5 V
1 1.4 MHz VIN = 2.7 V to 5.5 V, −40°C ≤ TJ ≤ +125°C
SOFT START PERIOD 750 1000 1200 µs CSS = 1 nF
THERMAL CHARACTERISTICS

Thermal Shutdown Threshold 140
Thermal Shutdown Hysteresis 40

COMPENSATOR

TRANSCONDUCTANCE (g

)

m

CURRENT SENSE AMPLIFIER GAIN (GCS)

50 µA/V

2

1.875 A/V ADP2105

°C
°C

2.8125 A/V ADP2106

3.625 A/V ADP2107

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 ADP2105/ADP2106/ADP2107 line regulation was measured in a servo loop on the automated test equipment that adjusts the feedback voltage to achieve a

specific COMP voltage.

4

All LX (switch) node characteristics are guaranteed only when the LX1 pin and LX2 pin are tied together.

5

These specifications are guaranteed from −40°C to +85°C.

ADP210x(x.x V) output voltage 10% above regulation
voltage

ADP210x(x.x V) output voltage 10% above regulation
voltage, −40°C ≤ TJ ≤ +125°C

= 0 V

EN

P-channel switch, ADP2106 and ADP2107,

−40°C ≤ TJ ≤ +125°C

N-channel synchronous rectifier, ADP2105,

−40°C ≤ T

≤ +125°C

J

N-channel synchronous rectifier, ADP2106 and ADP2107,

−40°C ≤ T

IN

≤ +125°C

J

= 5.5 V, VLX = 0 V, 5.5 V

Rev. C | Page 5 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

IN, EN, SS, COMP, FB to AGND −0.3 V to +6 V
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

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.

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

BOUNDARY CONDITION

Natural convection, 4-layer board, exposed pad soldered to the PCB.

ESD CAUTION

JA

Unit

Rev. C | Page 6 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

15 GND

16 FB

14 IN

13 PWIN1

PIN 1

EN 1

GND 2

GND 3

GND 4

INDICATO R

ADP2105/
ADP2106/
ADP2107

TOP VIEW

(Not to Scale)

6

SS

AGND 7

COMP 5

NC = NO CONNECT

Figure 4. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1 EN

Enable Input. Drive EN high to turn on the device. Drive EN low to turn off the device and reduce the input
current to 0.1 µA.

2, 3, 4, 15 GND

Test Pins. These pins are used for internal testing and are not ground return pins. These pins are to be tied to the
AGND plane as close as possible to the ADP2105/ADP2106/ADP2107.

5 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

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

Analog Ground. Connect the ground of the compensation components, the soft start capacitor, and the voltage
divider on the FB pin to the AGND pin as close as possible to the ADP2105/ ADP2106/ADP2107. The AGND is

also to be connected to the exposed pad of ADP2105/ADP2106/ADP2107.
8 NC No Connect. This is not internally connected and can be connected to other pins or left unconnected.
9, 13

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

Switch Outputs. The drain of the P-channel power switch and N-channel synchronous rectifier. These pins are to

be tied together and connected to the output LC filter between LX and the output voltage.
11 PGND

Power Ground. Connect the ground return of all input and output capacitors to the PGND pin using a power

ground plane as close as possible to the ADP2105/ADP2106/ADP2107. The PGND is then to be connected to the

exposed pad of the ADP2105/ADP2106/ADP2107.
14 IN

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 FB

Output Voltage Sense or Feedback Input. For fixed output versions, connect 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.

12 LX2

11 PGND

10 LX1

9 PWIN2

NC 8

06079-003

Rev. C | Page 7 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

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 5. 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, 4.1H
DCR: 43m
T

= 25°C

A

06079-085

Figure 6. Efficiency—ADP2105 (3.3 V Output)

100

95

90

VIN = 2.7V

85

80

75

70

EFFICIENCY (%)

65

60

55

50

1 10k

VIN = 3.6V

VIN = 4.2V

VIN = 5.5V

INDUCTOR: D62L CB, 2µH
DCR: 28m
T

= 25°C

A

10 100 1k

LOAD CURRENT (mA)

06079-062

Figure 7. Efficiency—ADP2106 (1.8 V Output)

95

90

85

80

EFFICIE NCY (%)

75

70

65

1 1000

Figure 8. Efficiency—ADP2105 (1.8 V Output)

100

95

90

VIN = 3.6V

85

80

75

70

EFFICIENCY (%)

65

60

55

50

1 10k

Figure 9. 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 10k

Figure 10. 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: D62L CB, 2µH
DCR: 28m
T

= 25°C

A

10 100 1k

LOAD CURRENT (mA)

VIN = 5.5V

INDUCTOR: D62L CB, 3.3µH
DCR: 47m
T

= 25°C

A

10 100 1k

LOAD CURRENT (mA)

06079-086

06079-008

06079-053

Rev. C | Page 8 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

100

95

90

VIN = 3.6V

85

80

75

70

EFFICIENCY (%)

65

60

55

50

1 10k

VIN = 2.7V

VIN = 4.2V

VIN = 5.5V

INDUCTOR: SD12, 1.2µH
DCR: 37m
T

= 25°C

A

10 100 1k

LOAD CURRENT (mA)

Figure 11. Efficiency—ADP2107 (1.2 V)

100

95

90

85

80

VIN = 4.2V

75

70

EFFICIENCY (%)

65

60

55

50

1 10k

VIN = 3.6V

10 100 1k

LOAD CURRENT (mA)

VIN = 5.5V

INDUCTOR: CDRH5D28, 2. 5µH
DCR: 13m
T

= 25°C

A

Figure 12. 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 10k

VIN = 2.7V

VIN = 4.2V

10 100 1k

VIN = 3.6V

VIN = 5.5V

INDUCTOR: D62L CB, 1.5µH
DCR: 21m
T

= 25°C

A

LOAD CURRENT (mA)

Figure 14. 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 10k

0.1 1 10 100 1k

LOAD CURRENT (mA)

5.5V, +125° C

Figure 15. 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 10k

1 10 100 1k

LOAD CURRENT (mA)

5.5V, +125° C

06079-064

Figure 13. Output Voltage Accuracy—ADP2107 (1.8 V)

Rev. C | Page 9 of 36

3.32

3.30

3.28

OUTPUT VOLTAGE (V)

3.26

3.24

3.22

0.01 10k

0.1 1 10 100 1k

LOAD CURRENT (mA)

Figure 16. Output Voltage Accuracy—ADP2107 (3.3 V)

06079-081

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

10k

1k

+25°C

–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 VOLTAG E (V)

Figure 17. Quiescent Current vs. Input Voltage

QUIESCENT CURRENT (µA)

100

0.802

0.801

10

1

0.8

190

180

170

160

150

140

130

NMOS SYNCHRONOUS RECTIFI ER

120

SWITCH ON RESISTANCE (m)

110

06079-016

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)

06079-093

Figure 20. Switch On Resistance vs. Input Voltage—ADP2105

120

100

PMOS POWER SWITCH

0.800

0.799

0.798

0.797

FEEDBACK VOLT AGE (V)

0.796

0.795
–40 125

–20 0 20 40 60 80 100 120

TEMPERATURE ( °C)

Figure 18. 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 19. Peak Current Limit of ADP2105

TA = 25°C

80

60

40

SWITCH ON RESISTANCE (m)

20

06079-017

0

2.7 5.4

NMOS SYNCHRONOUS RECTIFIER

TA = 25°C

3.0 3.3 3.6 3.9 4.2 4.5 4. 8 5.1

INPUT VOLTAGE (V)

06079-018

Figure 21. 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

3.0 3.3 3.6 3.9 4.2 4.5 4. 8 5.1

+125°C

–40°C

INPUT VOLTAG E (V)

+25°C

06079-021

Figure 22. Switching Frequency vs. Input Voltage

Rev. C | Page 10 of 36

ADP2105/ADP2106/ADP2107

www.BDTIC.com/ADI

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)

TA = 25°C

Figure 23. 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)

TA = 25°C

Figure 24. 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

Figure 25. Pulse-Skipping Threshold vs. Input Voltage for ADP2106

3

1

4

06079-072

135

120

105

90

75

60

45

30

15

06079-071

PULSE-SKIP PING THRESHO LD CURRENT (mA)

Figure 27. 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)

Figure 28. Pulse-Skipping Threshold vs. Input Voltage for ADP2107

LX (SWITCH) NODE

CH1 1V

INDUCTOR CURRENT

OUTPUT VOLTAGE

M 10µs A CH1 1.78V

45.8%CH4 1ACH3 5V

T

: 260mV
@: 3.26V

Figure 26. 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

Rev. C | Page 11 of 36