Datasheet

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Ultralow Profile, 500 mA, 6 MHz, Synchronous,

Step-Down, DC-to-DC Converters

Data Sheet

ADP2126/ADP2127

Rev. B

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FEATURES

1.20 V and 1.26 V fixed output voltage options

Clock signal enable

Logic signal enable also available on certain models

6 MHz operating frequency

Spread spectrum frequency modulation to reduce EMI

500 mA continuous output current

Input voltage: 2.1 V to 5.5 V

0.3 μA (typical) shutdown supply current

Pin-selectable power-saving mode

Compatible with tiny multilayer inductors

Internal synchronous rectifier

Internal compensation

Internal soft start

Output-to-ground short-circuit protection

Current-limit protection

Undervoltage lockout

Thermal shutdown protection

0.330 mm height (maximum), 6-ball BUMPED_CHIP (ADP2126)

0.200 mm height (maximum), 6-pad EWLP (ADP2127)

APPLICATIONS

Mobile phones

Digital still/video cameras

Digital audio

Portable equipment

Camera modules

Image stabilization systems

TYPICAL APPLICATIONS CIRCUIT

B2 A1

VIN

GND FB

EXTCLK MODE

2.2µF

OUT

2.2µF

INPUT

VOLTAGE

2.1V TO 5.5V

1.0µH

ADP2126/

ADP2127

OUTPUT

VOLTAGE

1.20V OR 1.26V

OFF ON

OFF

AUTO

PWM

09658-001

*LOGIC HIGH ENABLE IS ONLY AVAILABLE ON CERTAIN MODELS.

Figure 1.

GENERAL DESCRIPTION

The ADP2126/ADP2127 are high frequency, step-down, dc-to-

dc converters optimized for portable applications in which board

area and battery life are critical constraints. The fixed 6 MHz

operating frequency enables the use of tiny ceramic inductors

and capacitors and the regulators use spread spectrum frequency

modulation to reduce EMI. Additionally, synchronous rectification

improves efficiency and results in fewer external components.

At high load currents, the ADP2126/ADP2127 use a voltage

regulating pulse-width modulation (PWM) mode that maintains

a constant frequency with excellent stability and transient response.

Light load operation is determined by the state of the MODE pin.

In forced PWM mode, the converter continues operating in PWM

for light loads. Under light load conditions in auto mode, the

ADP2126/ADP2127 automatically enter a power-saving mode,

which uses pulse frequency modulation (PFM) to reduce the

effective switching frequency, thus ensuring the longest battery

life in portable applications.

The ADP2126/ADP2127 are enabled by a 6 MHz to 27 MHz

external clock signal applied to the EXTCLK pin. Certain models

can also be enabled with a logic high signal. When the external clock

is not switching and in a low logic state, the ADP2126/ADP2127

stop regulating and shut down to draw less than 0.3 μA (typical)

from the source.

The ADP2126/ADP2127 have an input voltage range of 2.1 V to

5.5 V, allowing the use of single Li+/Li polymer cell, three-cell

alkaline, NiMH cell, and other standard power sources. The

ADP2126/ADP2127 are internally compensated to minimize

external components and can source up to 500 mA. Other key

features, such as cycle-by-cycle peak current limit, soft start,

undervoltage lockout (UVLO), output-to-ground short-circuit

protection, and thermal shutdown provide protection for internal

and external circuit components.

Summary of content (20 pages)

PAGE 1
Ultralow Profile, 500 mA, 6 MHz, Synchronous, Step-Down, DC-to-DC Converters ADP2126/ADP2127 Data Sheet FEATURES INPUT VOLTAGE 2.1V TO 5.5V CIN 2.2µF ADP2126/ ADP2127 A2 VIN L 1.0µH SW B1 C2 GND FB C1 EXTCLK MODE B2 A1 OUTPUT VOLTAGE 1.20V OR 1.26V COUT 2.2µF PWM AUTO OFF ON OR ON * OFF *LOGIC HIGH ENABLE IS ONLY AVAILABLE ON CERTAIN MODELS. 09658-001 1.20 V and 1.
PAGE 2
ADP2126/ADP2127 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 External Clock (EXTCLK) Enable ........................................... 11 Applications....................................................................................... 1 Spread Spectrum Oscillator ...................................................... 12 Typical Applications Circuit............................................................
PAGE 3
Data Sheet ADP2126/ADP2127 SPECIFICATIONS VIN = 3.6 V, TA = 25°C for typical specifications, and TA = TJ = −40°C to +85°C for minimum and maximum specifications, unless otherwise noted. All specifications at temperature extremes are guaranteed via correlation using the standard statistical quality control (SQC) methods. Typical specifications are not guaranteed. Table 1.
PAGE 4
ADP2126/ADP2127 Parameter TIMING VIN High to EXTCLK On2 EXTCLK On to VOUT Rising Data Sheet Symbol t1 t2 (CLOCK) EXTCLK On to VOUT Rising VOUT Power-Up Time (Soft Start)2 EXTCLK Off to VOUT Falling EXTCLK Off to VOUT Falling VOUT Power-Down Time t2 (LOGIC) t3 t5 (CLOCK) t5 (LOGIC) t6 Minimum Shutdown Time2 Minimum Power-Off Time2 t 5 + t6 t7 Test Conditions/Comments See Figure 2 and Figure 3 VIN = 2.1 V to 5.
PAGE 5
Data Sheet ADP2126/ADP2127 ABSOLUTE MAXIMUM RATINGS ambient temperature can exceed the maximum limit as long as the junction temperature is within specification limits. Table 2. Parameter VIN to GND EXTCLK to GND SW, MODE to GND FB to GND Operating Ambient Temperature (TA) Operating Junction Temperature (TJ) at ILOAD = 500 mA Soldering Conditions 1 Rating −0.3 V to +6 V −0.3 V to +6 V −0.3 V to VIN −0.3 V to +3.
PAGE 6
ADP2126/ADP2127 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS BALL A1 INDICATOR 1 2 MODE VIN A SW EXTCLK B FB GND TOP VIEW BALL/PAD SIDE DOWN BUMPS/PADS ON OPPOSITE SIDE (Not to Scale) 09658-005 C Figure 4. Pin Configuration Table 4. Pin Function Descriptions Pin No. A1 Mnemonic MODE A2 B1 B2 VIN SW EXTCLK C1 FB C2 GND Description Mode Select. This pin toggles between auto mode (PFM and PWM switching) and PWM mode. Set MODE low to allow the part to operate in auto mode.
PAGE 7
Data Sheet ADP2126/ADP2127 TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.6 V, fEXTCLK = 10 MHz, VOUT = 1.20 V, L = 1.0 μH (CKP1608S1R0), CIN = 2.2 μF (GRM153R60J225ME95), COUT = 2.2 μF (GRM153R60G225M), and TA = 25°C, unless otherwise noted. 90 1.205 AUTO MODE 80 50 40 PWM MODE 30 VIN = 2.1V VIN = 2.5V VIN = 3.6V VIN = 4.2V VIN = 5.5V 20 10 0 1 10 100 1000 LOAD CURRENT (mA) 1.204 1.203 VIN = 2.1V VIN = 2.5V VIN = 3.6V VIN = 4.2V VIN = 5.5V 1.
PAGE 8
ADP2126/ADP2127 400 0.8 0.6 0.4 350 300 250 3.1 3.6 4.1 4.6 5.1 INPUT VOLTAGE (V) 150 2.1 09658-012 2.6 2.6 3.1 3.6 4.1 4.6 Figure 14. NMOS Drain-to-Source On Resistance 400 500 TA = –40°C TA = +25°C TA = +105°C 450 P-CHANNEL RDSON (mΩ) 350 400 350 300 300 250 200 150 TA = –40°C TA = +25°C TA = +85°C 2.6 3.1 3.6 4.1 4.6 5.1 INPUT VOLTAGE (V) 100 2.1 09658-013 PFM MODE QUIESCENT CURRENT (µA) ISW = 500mA 200 2.1 5.1 INPUT VOLTAGE (V) Figure 11.
PAGE 9
Data Sheet ADP2126/ADP2127 VIN = 2.1V VIN = 2.1V OUTPUT VOLTAGE (50mV/DIV) 1.20V OFFSET OUTPUT VOLTAGE (50mV/DIV) 1.20V OFFSET 1 1 LOAD CURRENT (200mA/DIV) LOAD CURRENT (100mA/DIV) 09658-018 TIME (40µs/DIV) 4 TIME (20µs/DIV) Figure 17. Load Transient Response, 0 mA to 150 mA, VIN = 2.1 V 09658-021 4 Figure 20. Load Transient Response, 250 mA to 420 mA, VIN = 2.1 V VIN = 3.6V VIN = 3.6V OUTPUT VOLTAGE (50mV/DIV) 1.20V OFFSET OUTPUT VOLTAGE (50mV/DIV) 1.
PAGE 10
ADP2126/ADP2127 Data Sheet NO LOAD ILOAD = 100mA OUTPUT VOLTAGE (500mV/DIV) OUTPUT VOLTAGE (20mV/DIV) 1.20V OFFSET 1 INDUCTOR CURRENT (200mA/DIV) 1 INDUCTOR CURRENT (200mA/DIV) 4 4 SW PIN VOLTAGE (5V/DIV) EXTCLK PIN VOLTAGE (5V/DIV) 09658-024 TIME (100µs/DIV) TIME (400ns/DIV) 09658-027 2 2 Figure 26. Typical PFM Mode Operation, ILOAD = 100 mA Figure 23. Startup, No Load RLOAD = 3.6Ω ILOAD = 150mA OUTPUT VOLTAGE (500mV/DIV) 1 1 OUTPUT VOLTAGE (10mV/DIV) 1.
PAGE 11
Data Sheet ADP2126/ADP2127 THEORY OF OPERATION VIN 2.1V TO 5.5V CIN VIN A2 VOUT PVIN ADP2126/ADP2127 FB AVIN C1 PDRIVE R1 PWM COMP EAMP R2 AGND BG RAMP COMPENSATION FB NDRIVE SW C2 PILIM PREF SOFT START SHORT-CIRCUIT PROTECTION ZXCOMP LOGIC AND PFM/PWM CONTROL L VOUT 1.20V OR 1.
PAGE 12
ADP2126/ADP2127 Data Sheet SPREAD SPECTRUM OSCILLATOR The ADP2126/ADP2127 incorporate spread spectrum functionality to modulate electromagnetic interference (EMI) for EMI sensitive applications. A typical switching converter with a regulated switching frequency has a narrow frequency spectrum centered at the target switching frequency.
PAGE 13
Data Sheet ADP2126/ADP2127 PROTECTION FEATURES Overcurrent Protection To ensure that excessively high currents do not damage the MOSFET switches, the ADP2126/ADP2127 incorporate cycle-bycycle overcurrent protection. This function is accomplished by monitoring the instantaneous peak current on the power PMOS switch. If this current exceeds the PMOS switch current limit (1 A typical), then the PMOS is immediately turned off.
PAGE 14
ADP2126/ADP2127 Data Sheet APPLICATIONS INFORMATION The low-profile ADP2126/ADP2127 are compatible with chip inductors and multilayer ceramic capacitors that are ideal for use in portable applications due to their small footprint and low height. The recommended components for low-profile applications may change as this technology advances. Table 5 and Table 6 list compatible inductors and capacitors. This section describes the selection of external components.
PAGE 15
Data Sheet ADP2126/ADP2127 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 voltage transient excursion (overshoot) is inversely proportional to the value of the output capacitor. When choosing output capacitors, it is important to account for the loss of capacitance due to output voltage dc bias.
PAGE 16
ADP2126/ADP2127 Data Sheet PCB LAYOUT GUIDELINES To ensure package reliability, consider the following guidelines when designing the footprint for the ADP2126/ADP2127. The BUMPED_CHIP device footprint must ultimately be determined according to application and customer specific reliability requirements, PCB fabrication quality, and PCB assembly capabilities. • 09658-031 • • Figure 31. ADP2126/ADP2127 Recommended Top Layer Layout • • • 09658-032 • Figure 32.
PAGE 17
Data Sheet ADP2126/ADP2127 OUTLINE DIMENSIONS 0.940 0.900 0.860 2 1 A BALL A1 IDENTIFIER 1.340 1.300 1.260 0.80 REF B 0.40 REF C TOP VIEW 0.40 REF (BALL SIDE DOWN) BOTTOM VIEW 0.330 0.315 0.300 (BALL SIDE UP) 0.225 TYP END VIEW SEATING PLANE 0.190 0.170 0.150 05-10-2010-A COPLANARITY 0.05 NOM 0.09 TYP Figure 33. 6-Ball Bumped Bare Die Sales [BUMPED_CHIP] (CD-6-4) Dimensions shown in millimeters 0.200 0.175 0.150 0.940 0.900 0.
PAGE 18
ADP2126/ADP2127 Data Sheet ORDERING GUIDE Model 1 ADP2126ACDZ-1.20R7 ADP2127ACNZ-1.20R7 ADP2127ACNZ1.260R7 ADP2126-1.2-EVALZ Output Voltage 1.20 V 1.20 V 1.26 V 1.20 V EXTCLK Enable Type Clock and logic Clock and logic Clock only Clock and logic Temperature Range −40°C to +85°C −40°C to +85°C −40°C to +85°C Package Description 6-Ball Bumped Bare Die Sales [BUMPED_CHIP] 6-Pad Embedded Wafer Level [EWLP] 6-Pad Embedded Wafer Level [EWLP] Evaluation Board for ADP2126 1 Z = RoHS Compliant Part.
PAGE 19
Data Sheet ADP2126/ADP2127 NOTES Rev.