ADP2107ACPZ-1.8 Analog Devices Inc, ADP2107ACPZ-1.8 Datasheet

ADP2107ACPZ-1.8

Manufacturer Part Number

ADP2107ACPZ-1.8

Description

V REG, 2A 1.8V, SMD, LFCSP-16, 2107

Manufacturer

Analog Devices Inc

Datasheet

1.ADP2105ACPZ-1.8-R7.pdf (36 pages)

Specifications of ADP2107ACPZ-1.8

Primary Input Voltage

3.6V

No. Of Outputs

Output Voltage

1.8V

Output Current

Voltage Regulator Case Style

LFCSP

No. Of Pins

Operating Temperature Range

-40Â°C To +125Â°C

Svhc

No SVHC

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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FEATURES

Extremely high 97% efficiency

Ultralow quiescent current: 20 μA

1.2 MHz switching frequency

0.1 μA shutdown supply current

Maximum load current

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

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.

OFF

ADP2105: 1 A

ADP2106: 1.5 A

ADP2107: 2 A

Figure 1. Circuit Configuration of ADP2107 with V

120pF

70kΩ

GND

TYPICAL OPERATING CIRCUIT

COMP

ADP2107-ADJ

GND

1nF

0.1μF

AGND

10Ω

PWIN1

PWIN2

PGND

LX2

LX1

INPUT VOLTAGE = 2.7V TO 5.5V

NC = NO CONNECT

10μF

OUTPUT VOLTAGE = 2.5V

2μH

85kΩ

40kΩ

OUT

10μF

= 2.5 V

0A TO 2A

4.7μF

LOAD

1 Amp/1.5 Amp/2 Amp Synchronous,

Step-Down DC-to-DC Converters

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

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 pulse-

width 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.

ADP2105/ADP2106/ADP2107

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

100

200

= 3.3V

= 5V

400

600

LOAD CURRENT (mA)

= 3.6V

800

1000 1200 1400 1600 1800

www.analog.com

OUT

= 2.5V

OUT

= 2.5 V

000

Related parts for ADP2107ACPZ-1.8

ADP2107ACPZ-1.8 Summary of contents

Page 1

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 ADP2106: 1.5 A ADP2107 Input voltage: 2 5.5 V Output voltage: ...

Page 2

ADP2105/ADP2106/ADP2107 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 ...

Page 3

FUNCTIONAL BLOCK DIAGRAM COMP 5 SOFT REFERENCE SS 6 START 0. ERROR AMP AGND 7 FOR PRESET VOLTAGE OPTIONS ONLY GND 2 GND 3 SLOPE GND 4 COMPENSATION NC 8 GND 15 OSCILLATOR EN 1 ...

Page 4

ADP2105/ADP2106/ADP2107 SPECIFICATIONS 25°C, unless otherwise noted Table 1. Parameter INPUT CHARACTERISTICS Input Voltage Range Undervoltage Lockout Threshold 2 Undervoltage Lockout Hysteresis OUTPUT CHARACTERISTICS Output Regulation Voltage Load Regulation 3 Line Regulation ...

Page 5

Parameter INPUT CURRENT CHARACTERISTICS IN Operating Current 4 IN Shutdown Current LX (SWITCH) NODE CHARACTERISTICS Resistance Leakage Current 5 LX Peak Current Limit LX Minimum On-Time ENABLE CHARACTERISTICS EN Input High Voltage EN Input ...

Page 6

ADP2105/ADP2106/ADP2107 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter IN, EN, SS, COMP AGND LX1, LX2 to PGND PWIN1, PWIN2 to PGND PGND to AGND GND to AGND PWIN1, PWIN2 to IN Operating Junction Temperature Range Storage Temperature Range Soldering ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 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 ...

Page 8

ADP2105/ADP2106/ADP2107 TYPICAL PERFORMANCE CHARACTERISTICS 100 INDUCTOR: SD14, 2.5µH DCR: 60mΩ LOAD CURRENT (mA) ...

Page 9

INDUCTOR: SD12, 1.2µH 55 DCR: 37mΩ 25° 100 1k ...

Page 10

ADP2105/ADP2106/ADP2107 10k 1k +25°C –40°C 100 10 +125°C 1 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 INPUT VOLTAGE (V) Figure 17. Quiescent Current vs. Input Voltage 0.802 0.801 0.800 0.799 0.798 0.797 0.796 0.795 –40 – ...

Page 11

ADP2106 (1.5A) 2.20 2.15 2.10 2.05 2.00 1.95 1.90 1.85 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 INPUT VOLTAGE (V) Figure 23. Peak Current Limit of ADP2106 3.00 2.95 2.90 2.85 ADP2107 (2A) 2.80 2.75 2.70 ...

Page 12

ADP2105/ADP2106/ADP2107 190 180 170 160 PMOS POWER SWITCH 150 140 130 NMOS SYNCHRONOUS RECTIFIER 120 110 100 2.7 3.0 3.3 3.6 3.9 4.2 INPUT VOLTAGE (V) Figure 29. Switch On Resistance vs. Temperature—ADP2105 140 120 PMOS POWER SWITCH 100 80 ...

Page 13

LX (SWITCH) NODE 3 CHANNEL 3 FREQUENCY = 336.6kHz INDUCTOR CURRENT OUTPUT VOLTAGE 1 4 CH1 1V M 4µs CH3 5V CH4 1AΩ T 45% Figure 35. Current Limit Behavior of ADP2107 (Frequency Foldback) 3 Δ: 2.86A @: 2.86A 1 ...

Page 14

ADP2105/ADP2106/ADP2107 THEORY OF OPERATION The ADP2105/ADP2106/ADP2107 are step-down, dc-to-dc converters that use a fixed frequency, peak current mode archi- tecture with an integrated high-side switch and low-side synchron- ous rectifier. The high 1.2 MHz switching frequency and tiny 16-lead, 4 ...

Page 15

SLOPE COMPENSATION Slope compensation stabilizes the internal current control loop of the ADP2105/ADP2106/ADP2107 when operating beyond 50% duty cycle to prevent subharmonic oscillations imple- mented by summing a fixed, scaled voltage ramp to the current sense signal during ...

Page 16

ADP2105/ADP2106/ADP2107 APPLICATIONS INFORMATION EXTERNAL COMPONENT SELECTION The external component selection for the ADP2105/ADP2106/ ADP2107 application circuits shown in Figure 37 and Figure 38 depend on input voltage, output voltage, and load current requirements. Additionally, trade-offs between performance parameters like efficiency ...

Page 17

When R is determined, calculate the value of the top resistor BOT ( using the following equation: TOP ⎡ ⎤ − OUT FB ⎢ ⎥ TOP BOT ⎣ ⎦ The ADP2105/ADP2106/ADP2107(x.x ...

Page 18

ADP2105/ADP2106/ADP2107 OUTPUT CAPACITOR SELECTION The output capacitor selection affects both the output voltage ripple and the loop dynamics of the converter. For a given loop crossover frequency (the frequency at which the loop gain drops to 0 dB), the maximum ...

Page 19

INPUT FILTER The IN pin is the power source for the ADP2105/ADP2106/ ADP2107 internal circuitry, including the voltage reference and current sense amplifier that are sensitive to power supply noise. To prevent high frequency switching noise on the PWIN pins ...

Page 20

ADP2105/ADP2106/ADP2107 BODE PLOTS LOOP GAIN LOOP PHASE 0 CROSSOVER OUTPUT VOLTAGE = 1.8V FREQUENCY = 87kHz –10 INPUT VOLTAGE = 5.5V LOAD CURRENT = 1A –20 INDUCTOR = 2.2µH (LPS4012) OUTPUT CAPACITOR = 22µF ...

Page 21

LOAD TRANSIENT RESPONSE T OUTPUT CURRENT 3 OUTPUT VOLTAGE (AC-COUPLED NODE (SWITCH NODE) CH1 2.00V CH2 100mV~ M 20.0µs CH3 1.00A Ω T 10.00% OUTPUT CAPACITOR: 22µF + 22µF + 4.7µF INDUCTOR: SD14, 2.5µH COMPENSATION RESISTOR: 270kΩ ...

Page 22

ADP2105/ADP2106/ADP2107 EFFICIENCY CONSIDERATIONS Efficiency is the ratio of output power to input power. The high efficiency of the ADP2105/ADP2106/ADP2107 has two distinct advantages. First, only a small amount of power is lost in the dc- to-dc converter package that reduces ...

Page 23

For example application where the ADP2107(1 used with an input voltage load current and a maximum ambient temperature of 85° load current the ...

Page 24

ADP2105/ADP2106/ADP2107 DESIGN EXAMPLE Consider an application with the following specifications: Input Voltage = 3 4.2 V. Output Voltage = 2 V. Typical Output Current = 600 mA. Maximum Output Current = 1.2 A. Soft Start Time = 2 ...

Page 25

EXTERNAL COMPON ENT RECOMMENDATIONS For popular output voltage options at 80 kHz crossover fre Figure 38). Table 11. Recommended External Com 1 Part V (V) C (μ F) OUT IN1 ADP2105(ADJ) 0.9 4.7 ADP2105(ADJ) 1.2 4.7 ADP2105(ADJ) 1.5 4.7 ADP2105(ADJ) ...

Page 26

ADP2105/ADP2106/ADP2107 For popular output voltage options at 80 kHz crossover frequency with 5 Figure 38). Table 12. Re commended External Components 1 Part V (V) C (μF) OUT IN1 ADP2105(ADJ) 0.9 4.7 ADP2105(ADJ) 1.2 4.7 ADP2105(ADJ) 1 ADP2105(ADJ) ...

Page 27

CIRCUIT BOARD LAYOUT RECOMMENDATIONS Good circui t board layout is essential to obtaining the best performance from the ADP2105/ADP2106/ADP21 circui t layout degrades utp ut ripple, a electromagnetic i terfer n ence (E MI) and elec compatibility ...

Page 28

ADP2105/ADP2106/ADP2107 EVALUATION BOARD EVALUATION BOARD SCHEMATIC FOR ADP210 VCC 100kΩ 140kΩ C6 68pF Figure 53. Evaluation Board Schematic RECOMMENDED PCB LAYOUT (EVALUATION BOAR ENABLE 100kΩ PULL-DOWN PLACE ...

Page 29

ENABL ANALOG GROUND PLANE CONNECT THE EXPOSED PAD OF THE ADP2105/ADP2106/ADP2107 TO A LARGE GROUND PLANE TO AID POWER DISSIPATION. FEEDBACK TRACE: THIS TRACE CONNECTS THE RESISTIVE VOLTAGE DIVIDER ON THE FB PIN TO T PLACE THIS ...

Page 30

ADP2105/ADP2106/ADP2107 APPLICATION CIRCUITS ON OFF 70kΩ 120pF ON OFF 140kΩ 68pF Figure 57. Application Circuit—V 0.1μF V INPUT VOLTAGE = 5V 10Ω 10μF V OUT ...

Page 31

V INPUT VOLTAGE = 2.7V TO 4.2V 10Ω OUT GND IN PWIN1 ON EN LX2 OFF 1 12 GND PGND 2 11 ADP2105-1.8 GND LX1 PWIN2 GND 4 ...

Page 32

ADP2105/ADP2106/ADP2107 ON EN OFF 1 GND 2 GND 3 GND 4 180kΩ 56pF Figure 60. Application Circuit—V 0.1μF V INPUT VOLTAGE = 5V 10Ω 10μ GND IN PWIN1 LX2 12 2 2.5μH ...

Page 33

... A 1 ADP2105ACPZ-1.8- ADP2105ACPZ-3.3- ADP2105ACPZ- ADP2106ACPZ-1.2-R7 1.5 A ADP2106ACPZ-1.5- ADP2106ACPZ-1.8-R7 1.5 A ADP2106ACPZ-3.3- ADP2106ACPZ-R7 1 ADP2107ACPZ-1.2- ADP2107ACPZ-1.5- ADP2107ACPZ-1.8- ADP2107ACPZ-3.3- ADP2107ACPZ- ADP2105-1.8-EVALZ 1 1 ADP2105-EVALZ ADP2106-1.8-EVALZ 1 1 ADP2106-EVALZ 1 ADP2107-1.8-EVALZ 1 ADP2107-EVALZ RoHS Compliant Part. 4.00 0.60 MAX BSC SQ 0.60 MAX 13 12 0.65 BSC TOP 3.75 EXPOSED VIEW ...

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