Datasheet

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3 A, 1.2 MHz/600 kHz High Efficiency

Synchronous Step-Down DC-to-DC Regulator

Data Sheet

ADP2118

Rev. C Document Feedback

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FEATURES

3 A continuous output current

75 mΩ and 40 mΩ integrated FET

±1.5% output accuracy

Input voltage range from 2.3 V to 5.5 V

Output voltage from 0.6 V to V

600 kHz or 1.2 MHz fixed switching frequency

Synchronizable between 600 kHz and 1.4 MHz

Selectable synchronize phase shift: 0

or 180

Selectable PWM or PFM mode operation

Current mode architecture

Precision enable input

Power good output

Voltage tracking input

Integrated soft start

Internal compensation

Starts up into a precharged output

UVLO, O V P, O C P, and thermal shutdown

Available in 16-lead 4mm × 4mm LFCSP_WQ package

Supported by ADIsimPower™ design tool

APPLICATIONS

Point of load conversion

Communications and networking equipments

Industrial and instrumentation

Consumer electronics

Medical appliances

GENERAL DESCRIPTION

The ADP2118 is a low quiescent current, synchronous, step-down,

dc-to-dc regulator in a compact 4mm × 4mm LFCSP_WQ

package. It uses a current mode, constant frequency pulse-width

modulation (PWM) control scheme for excellent stability and

transient response. Under light loads, the ADP2118 can be

configured to operate in pulse frequency modulation (PFM)

mode that reduces switching frequency to save power.

The ADP2118 runs from input voltages of 2.3 V to 5.5 V. The

output voltage of the ADP2118ACPZ-R7 is adjustable from

0.6 V to input voltage (V

), and the ADP2118ACPZ-x.x-R7 are

available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V,

1.5 V, 1.2 V, and 1.0 V. The ADP2118 requires minimal external

parts and provides a high efficiency solution with its integrated

power switch, synchronous rectifier, and internal compensation.

The IC draws less than 3 µA from the input source when it is

disabled. Other key features include undervoltage lockout

(UVLO), integrated soft start to limit inrush current at startup,

overvoltage protection (OVP), overcurrent protection (OCP),

and thermal shutdown (TSD).

TOP

10kΩ

BOT

2.21kΩ

10kΩ

10Ω

SYNC/MODE

FREQ

TRK

PVIN

ADP2118

100µF

X5R,

6.3V

OUT

100µF

X5R,

6.3V

0.1µF

OUT

3.3V

08301-001

1µH

16 15 14 13

5 6 7 8

PGND

GND

PGND

PGOOD

VIN

PVIN

Figure 1. Typical Applications Circuit

08301-050

100

0.01 0.1 1 10

EFFICIENCY (%)

OUTPUT CURRENT (A)

= 5V

OUT

= 3.3V

= 1.2MHz

PFM OPERATION

FPWM OPERATION

Figure 2. Efficiency vs. Output Current

Summary of content (24 pages)

PAGE 1
3 A, 1.2 MHz/600 kHz High Efficiency Synchronous Step-Down DC-to-DC Regulator ADP2118 Data Sheet FEATURES GENERAL DESCRIPTION 3 A continuous output current 75 mΩ and 40 mΩ integrated FET ±1.5% output accuracy Input voltage range from 2.3 V to 5.5 V Output voltage from 0.6 V to VIN 600 kHz or 1.2 MHz fixed switching frequency Synchronizable between 600 kHz and 1.
PAGE 2
ADP2118 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Tracking ....................................................................................... 14 Applications ....................................................................................... 1 Oscillator and Synchronization ................................................ 15 General Description .........................................................
PAGE 3
Data Sheet ADP2118 SPECIFICATIONS VIN = PVIN = 3.3 V, EN = VIN, SYNC/MODE = high @ TJ = −40°C to +125°C, unless otherwise noted. Typical values are at TJ = 25oC. Table 1.
PAGE 4
ADP2118 Parameter EN EN Input Rising Threshold EN Input Hysteresis EN Pull-Down Resistor THERMAL Thermal Shutdown Threshold Thermal Shutdown Hysteresis Data Sheet Symbol Test Conditions/Comments Min Typ Max Unit VIN = 2.3 V to 5.5 V VIN = 2.3 V to 5.5 V 1.12 1.2 100 1 1.28 V mV MΩ 140 15 1 Specified by the circuit in Figure 45. Pin-to-pin measurements. 3 Guaranteed by design. 2 Rev.
PAGE 5
Data Sheet ADP2118 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter VIN, PVIN SW FB, SYNC/MODE, EN, TRK, FREQ, PGOOD PGND to GND Operating Junction Temperature Range Storage Temperature Range Soldering Conditions Rating −0.3 V to +6 V −0.3 V to +6 V −0.3 V to +6 V −0.3 V to +0.3 V −40°C to +125°C −65°C to +150°C JEDEC J-STD-020 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device.
PAGE 6
ADP2118 Data Sheet 13 PVIN 14 VIN 16 PGOOD 15 EN PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SYNC/MODE 1 12 PVIN ADP2118 11 SW TOP VIEW 10 SW TRK 3 9 PGND 7 SW PGND 8 GND 5 PGND 6 FB 4 NOTES 1. THE EXPOSED PAD SHOULD BE SOLDERED TO AN EXTERNAL GROUND PLANE UNDERNEATH THE IC FOR THERMAL DISSIPATION. 08301-002 FREQ 2 Figure 3. Pin Configuration Table 4. Pin Function Descriptions Pin No.
PAGE 7
Data Sheet ADP2118 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 90 90 80 80 70 70 EFFICIENCY (%) 60 50 40 40 10 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A) 0 90 90 80 80 70 70 EFFICIENCY (%) 100 60 50 40 INDUCTOR COILCRAFT MSS1038-102NL 0.5 1.0 1.5 2.0 2.5 2.0 3.0 3.0 50 40 10 OUTPUT CURRENT (A) 2.5 60 VOUT = 1.0V VOUT = 1.2V VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V VOUT = 3.3V 20 0 0 1.5 30 VOUT = 1.0V VOUT = 1.2V VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V VOUT = 3.
PAGE 8
Data Sheet 100 100 90 90 80 80 70 70 EFFICIENCY (%) 60 50 40 60 50 40 30 30 VOUT = 1.0V VOUT = 1.2V VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V VOUT = 3.3V 10 INDUCTOR SUMIDA CDRH105R2R2NC 0 0 0.5 1.0 1.5 2.0 2.5 VOUT = 1.0V VOUT = 1.2V VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V VOUT = 3.3V 20 10 3.0 OUTPUT CURRENT(A) INDUCTOR SUMIDA CDRH105R2R2NC 0 08301-020 20 0 0.5 1.5 1.0 2.0 2.5 3.0 OUTPUT CURRENT (A) Figure 10. Efficiency (600 kHz, VIN = 5 V, FPWM) vs.
PAGE 9
Data Sheet ADP2118 1350 660 640 1200 1150 1100 1050 1000 2.3 3.1 3.5 3.9 4.3 4.7 5.1 600 580 560 540 TJ = –40°C TJ = +25°C TJ = +125°C 520 TJ = –40°C TJ = +25°C TJ = +125°C 2.7 620 5.5 VIN (V) 500 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 VIN (V) 08301-029 SWITCHING FREQUENCY (kHz) 1250 08301-026 SWITCHING FREQUENCY (kHz) 1300 Figure 19. Switching Frequency vs. VIN at 600 kHz Figure 16. Switching Frequency vs. VIN at 1.2 MHz 1.30 2.22 1.28 2.20 1.26 RISING 2.18 1.
PAGE 10
ADP2118 Data Sheet EN EN 3 3 VOUT VOUT 1 1 PGOOD PGOOD 2 2 IL IL CH1 500mV CH3 5V CH2 5V CH4 2A Ω M1ms T 20.40% A CH3 08301-035 4 08301-032 4 CH1 500mV CH2 5V CH4 2A Ω CH3 5V 3.10V Figure 22. Soft Start with Full Load (1.2 MHz, VIN = 5 V) M1ms T 30.2% A CH3 3.10V Figure 25. Soft Start with Precharge (1.2 MHz, VIN = 5 V) VOUT (AC) VOUT (AC) 1 1 IO IO CH1 50mV CH4 2A Ω M200µs T 30.40% A CH4 1.36A 08301-036 4 08301-033 4 CH1 50mV CH4 2A Ω M200µs T 30.40% A CH4 1.
PAGE 11
Data Sheet ADP2118 VOUT VOUT 1 1 SW SW 2 2 IL IL CH1 500mV CH2 5V CH4 5A Ω M2ms T 29.60% A CH1 08301-041 4 08301-038 4 CH1 500mV CH2 5V CH4 5A Ω 670mV Figure 28. Output Short M2ms T 59.60% A CH1 670mV Figure 31. Output Short Recovery 1 VOUT (AC) TRK IL 4 FB 1 SW CH1 500mV CH2 500mV M4ms T 59% A CH2 08301-042 08301-039 2 CH1 50mV 640mV CH2 5V CH4 1A Ω M4µs T 64.60% A CH4 1.72A A CH2 3.1V Figure 32. PFM Mode Figure 29.
PAGE 12
Data Sheet 200 160 48 160 36 120 36 120 24 80 24 80 12 40 12 40 0 0 0 0 CROSS FREQUENCY: 102kHz PHASE MARGIN: 50° 1k 10k 100k –24 –80 –120 –36 –120 –160 –48 –200 –60 100 1M FREQUENCY (Hz) 1 2 –160 CROSS FREQUENCY: 93kHz PHASE MARGIN: 56° –200 1k 10k 100k 1M FREQUENCY (Hz) Figure 37. Bode Plot at VIN = 5 V, VOUT = 1.2 V, IO = 3 A, fS = 1.
PAGE 13
Data Sheet ADP2118 FUNCTIONAL BLOCK DIAGRAM PVIN EN VIN ADP2118 PMOS CURRENT SENSE AMP ZCOMP TRK ERRO AMP 0.6V SOFT START UVLO Gm PFET SKIP CMP LOGIC CONTROL SW SKIP MODE THRESHOLD FB NFET 0.66V SLOPE COMPENSATION CLK NMOS CURRENT SENSE AMP 0.54V PGOOD OSCILLATOR SYNC/MODE FREQ Figure 40. Functional Block Diagram Rev.
PAGE 14
ADP2118 Data Sheet THEORY OF OPERATION The ADP2118 is a step-down, dc-to-dc regulator that uses fixed frequency, peak current-mode architecture with an integrated high-side switch and low-side synchronous rectifier. The high switching frequency and tiny 16-lead, 4 mm × 4 mm LFCSP_WQ package allow for a small step-down dc-to-dc regulator solution.
PAGE 15
Data Sheet ADP2118 OSCILLATOR AND SYNCHRONIZATION The internal oscillator of ADP2118 can be set to 600 kHz or 1.2 MHz. Drive the FREQ pin low for 600 kHz; drive FREQ pin high for 1.2 MHz. To synchronize the ADP2118, drive an external clock at the SYNC/MODE pin. The frequency of the external clock can be in the range of 600 kHz to 1.4 MHz. During synchronization, the regulator operates in CCM mode only.
PAGE 16
ADP2118 Data Sheet APPLICATIONS INFORMATION This section describes the external components selection for the ADP2118. The typical application circuit is shown in Figure 41. C1 0.1µF R1 10Ω SYNC/MODE 2 FREQ 14 13 PVIN CIN 100µF X5R, 6.3V PVIN 12 SW ADP2118 SW 9 PGND FB PGND 4 PGND SW 10 GND TRK 6 7 8 L 1µH 11 3 5 VIN 5V COUT 100µF X5R, 6.3V The inductor value is determined by the operating frequency, input voltage, output voltage, and ripple current.
PAGE 17
Data Sheet ADP2118 The ADP2118 has integrated loop compensation for simple power design. Table 5 and Table 6 show the typical recommended inductors and capacitors for the ADP2118. X5R or X7R ceramic capacitors are highly recommended. Table 5. Recommended L and COUT Value at fS = 1.
PAGE 18
ADP2118 Data Sheet TYPICAL APPLICATION CIRCUITS C1 0.1µF R1 10Ω SYNC/MODE 2 FREQ 13 VIN EN 1 14 PVIN 15 CIN 100µF X5R, 6.3V PVIN 12 L 1µH SW 11 ADP2118 PGND SW 9 PGND SW 10 FB PGND TRK 4 GND 3 5 6 7 8 VIN 3.3V COUT 100µF X5R, 6.3V VOUT 1.2V 3A L: MSS1038-102NL COILCRAFT CIN, COUT: C3225X5R0J107M TDK RTOP 10kΩ 08301-008 RBOT 10kΩ 16 PGOOD R2 10kΩ Figure 45. 1.2 V, 3 A, 1.2 MHz Step-Down Regulator, Force Continuous Conduction Mode C1 0.
PAGE 19
Data Sheet ADP2118 C1 0.1µF R1 10Ω 14 13 VIN PVIN 1 SYNC/MODE 2 FREQ CIN 100µF X5R, 6.3V PVIN 12 L 1µH SW 11 ADP2118 PGND SW 9 PGND SW 10 FB PGND TRK 4 GND 3 5 6 7 8 VIN 5V VOUT 1.8V 3A COUT 100µF X5R, 6.3V L: MSS1038-102NL COILCRAFT CIN, COUT: C3225X5R0J107M TDK RTOP 20kΩ 08301-010 RBOT 10kΩ 15 EN 1MHz EXT CLOCK 16 PGOOD R2 10kΩ Figure 47. 1.8 V, 3 A Step-Down Regulator, Synchronized to 1 MHz In Phase with the External Clock C1 0.
PAGE 20
ADP2118 Data Sheet C1 0.1µF RTRKT 10kΩ 1 SYNC/MODE 2 FREQ 15 14 13 EN PVIN PGOOD 16 VIN R2 10kΩ CIN 100µF X5R, 6.3V PVIN 12 SW 11 ADP2118 3 TRK SW 10 4 FB SW 9 RBOT 2.21kΩ RTOP 10kΩ PGND PGND PGND RTRKB 2.21kΩ GND VMASTER 5 6 7 8 VIN 5V L 1µH COUT 100µF X5R, 6.3V L: MSS1038-102NL COILCRAFT CIN, COUT: C3225X5R0J107M TDK Figure 49. 3.3 V, 3 A, 1.2 MHz Step-Down Regulator, Tracking Mode Rev. C | Page 20 of 24 VOUT 3.
PAGE 21
Data Sheet ADP2118 OUTLINE DIMENSIONS 0.35 0.30 0.25 0.65 BSC PIN 1 INDICATOR 16 13 1 12 EXPOSED PAD 2.60 2.50 SQ 2.40 9 TOP VIEW 0.80 0.75 0.70 0.50 0.40 0.30 4 8 BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF SEATING PLANE 5 FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. COMPLIANT TO JEDEC STANDARDS MO-220-WGGC. 042709-A PIN 1 INDICATOR 4.10 4.00 SQ 3.90 Figure 50.
PAGE 22
ADP2118 Data Sheet NOTES Rev.
PAGE 23
Data Sheet ADP2118 NOTES Rev.