Datasheet

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2 A/1.25 A, 1.2 MHz, Synchronous,

Step-Down DC-to-DC Regulators

Data Sheet

ADP2119/ADP2120

Rev. A

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FEATURES

Continuous output current

ADP2119: 2 A

ADP2120: 1.25 A

145 mΩ and 70 mΩ integrated MOSFETs

Input voltage range from 2.3 V to 5.5 V

Output voltage from 0.6 V to V

±1.5% output accuracy

1.2 MHz fixed switching frequency

Synchronizable between 1 MHz and 2 MHz

Selectable PWM or PFM mode operation

Current mode architecture

Precision threshold enable input

Power-good flag

Voltage tracking

Integrated soft start

Internal compensation

Startup with precharged output

UVLO, OVP, OCP, and thermal shutdown

10-lead, 3 mm × 3 mm LFCSP_WD package

Supported by ADIsimPower™ design tool

APPLICATIONS

Point of load conversion

Communications and networking equipment

Industrial and instrumentation

Consumer electronics

Medical applications

TYPICAL APPLICATION CIRCUIT

ADP2119/ADP2120

VIN

SYNC/MODE

PVIN

PGOOD

TRK

PGND

GND

10kΩ

22µF

X5R

6.3V

OUT

22µF

X5R

6.3V

0.1µF

10Ω

BOT

2.21kΩ

OUT

3.3V

1.5µH

TOP

10kΩ

08716-001

Figure 1.

GENERAL DESCRIPTION

The ADP2119/ADP2120 are low quiescent current, synchronous,

step-down dc-to-dc regulators in a compact 3 mm × 3 mm

LFCSP_WD package. Both devices use a current mode, constant

frequency pulse-width modulation (PWM) control scheme for

excellent stability and transient response. Under light load conditions,

they can be configured to operate in a pulse frequency modulation

(PFM) mode, which reduces switching frequency to save power.

The ADP2119/ADP2120 support input voltages from 2.3 V to

5.5 V. The output voltage can be adjusted from 0.6 V up to the

input voltage (V

) for the adjustable version, whereas the fixed

output version is 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 ADP2119/ADP2120 require

minimal external parts and provide a high efficiency solution with

their integrated power switches, synchronous rectifiers, and internal

compensation. Each IC draws less than 2 µA current 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).

100

0.01 0.1 1

EFFICIENCY (%)

OUTPUT CURRENT (A)

PFM

FPWM

= 5V

OUT

= 1.8V

08716-002

Figure 2. ADP2119 Efficiency vs. Output Current

Summary of content (24 pages)

PAGE 1
FEATURES Continuous output current ADP2119: 2 A ADP2120: 1.25 A 145 mΩ and 70 mΩ integrated MOSFETs Input voltage range from 2.3 V to 5.5 V Output voltage from 0.6 V to VIN ±1.5% output accuracy 1.
PAGE 2
ADP2119/ADP2120 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Integrated Soft Start ................................................................... 16 Applications ....................................................................................... 1 Tracking ....................................................................................... 17 Typical Application Circuit ...............................
PAGE 3
Data Sheet ADP2119/ADP2120 SPECIFICATIONS VIN = VPVIN = 3.3 V, EN = VIN, SYNC/MODE = VIN at TJ = −40°C to +125°C, unless otherwise noted. Table 1.
PAGE 4
ADP2119/ADP2120 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 150 25 1 Specified by the circuit in Figure 54. Specified by the circuit in Figure 58. Pin-to-pin measurements. 4 Guaranteed by design. 2 3 Rev.
PAGE 5
Data Sheet ADP2119/ADP2120 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter VIN, PVIN SW FB, SYNC/MODE, EN, TRK, 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
ADP2119/ADP2120 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS VIN 1 10 EN PVIN 2 9 SYNC/MODE SW 3 8 PGOOD PGND 4 7 TRK GND 5 6 FB EXPOSED PAD NOTES 1. THE EXPOSED PAD SHOULD BE SOLDERED TO AN EXTERNAL GROUND PLANE UNDERNEATH THE IC FOR THERMAL DISSIPATION. 08716-003 ADP2119/ADP2120 Figure 3. Pin Configuration (Top View) Table 4. Pin Function Descriptions Pin No.
PAGE 7
Data Sheet ADP2119/ADP2120 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 90 90 80 80 70 70 EFFICIENCY (%) 60 50 40 30 40 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT CURRENT (A) 0 90 80 80 70 70 EFFICIENCY (%) 100 90 60 50 40 INDUCTOR SUMIDA CDRH5D18BHPNP-1R5M 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT CURRENT (A) 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 60 50 40 30 VOUT = 1.0V VOUT = 1.2V VOUT = 1.5V VOUT = 1.8V VOUT = 2.5V VOUT = 3.3V VOUT = 1.
PAGE 8
Data Sheet 100 90 90 80 80 70 70 EFFICIENCY (%) 100 50 40 INDUCTOR SUMIDA CDRH5D18BHPNP-1R5M 0.2 0.4 0.6 0.8 1.0 1.2 1.4 OUTPUT CURRENT (A) 20 10 0 604 800 603 FEEDBACK VOLTAGE (mV) QUIESCENT CURRENT (µA) 605 850 750 700 650 600 550 3.5 3.9 4.3 4.7 5.1 5.5 VIN (V) 1.0 1.2 1.4 602 601 600 599 598 597 594 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) Figure 14. Feedback Voltage vs. Temperature (VIN = 3.3 V) Figure 11. Quiescent Current vs.
PAGE 9
Data Sheet ADP2119/ADP2120 1.30 2.30 1.25 2.25 UVLO THRESHOLD (V) 1.15 FALLING 1.10 1.05 2.15 FALLING 2.10 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.00 –40 60 80 100 120 TJ = +125°C TJ = +25°C TJ = –40°C 3.3 PEAK CURRENT LIMIT (A) 2.9 2.8 2.7 2.6 3.1 2.9 2.7 2.5 2.3 0 20 40 60 80 100 120 TEMPERATURE (°C) 2.1 2.3 08716-017 –20 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 08716-020 PEAK CURRENT LIMIT (A) 40 3.5 3.0 5.5 VIN (V) Figure 17. Peak Current Limit vs.
PAGE 10
ADP2119/ADP2120 Data Sheet T T EN EN 3 3 VOUT VOUT 1 1 PGOOD PGOOD 2 2 IL IL 4 M400µs T 30.4% A CH3 3.60V CH1 500mV CH2 5.00V CH3 5.00V CH4 2.00A Ω Figure 22. Soft Start with Full Load (ADP2119, VIN = 5 V) M400µs T 784.0µs A CH3 3.50V 08716-025 CH1 500mV CH2 5.00V CH3 5.00V CH4 2.00A Ω 08716-022 4 Figure 25. Soft Start with Precharged Output (ADP2119, VIN = 5 V) T T VOUT (AC) VOUT (AC) 1 1 IO IO 4 CH4 1.00A Ω M200µs A CH4 T 596.0µs 880mA CH1 50.0mV Figure 23.
PAGE 11
Data Sheet ADP2119/ADP2120 T T VOUT VOUT 1 1 SW SW 2 2 IL IL 4 M2.0ms A CH1 T 3.92ms 480mV CH1 500mV CH2 5.00V CH4 2.00A Ω Figure 28. Output Short (ADP2119) M2.0ms A CH1 T –2.08ms 560mV 08716-031 CH1 500mV CH2 5.00V CH4 2.00A Ω 08716-028 4 Figure 31. Output Short Recovery (ADP2119) T T VOUT VOUT 1 1 SW SW 2 2 IL IL 4 200mV CH1 500mV CH2 5.00V CH4 2.00A Ω Figure 29. Output Short (ADP2120) M2.0ms A CH1 T –2.12ms 560mV 08716-032 M2.0ms A CH1 T 3.96ms 4.
PAGE 12
Data Sheet T VOUT (AC) MAGNITUDE (dB) 1 SW 2 IL 80 200 64 160 48 120 32 80 16 40 0 0 –16 –40 –32 –80 –48 –120 PHASE (Degrees) ADP2119/ADP2120 4 M4.0µs A CH4 T –40.0ns 820mA –160 CROSS FREQUENCY: 124kHz PHASE MARGIN: 46° –80 1k 10k –200 100k 08716-037 CH1 20.0mV CH2 5.00V CH4 500mA Ω 08716-034 –64 1M FREQUENCY (Hz) Figure 34. PFM Mode Figure 37. ADP2119 Bode Plot at VIN = 5 V, VOUT = 1.
PAGE 13
200 80 200 64 160 64 160 48 120 48 120 32 80 32 80 16 40 16 40 0 0 0 0 –16 –40 –16 –40 –32 –80 –32 –80 –48 –120 –48 –120 –64 –160 –64 –200 –80 1k 1M FREQUENCY (Hz) 1M Figure 43. ADP2120 Bode Plot at VIN = 5 V, VOUT = 1.0 V, IO = 1.25 A, L = 1.
PAGE 14
200 80 200 64 160 64 160 48 120 48 120 32 80 32 80 16 40 16 40 0 0 0 0 –16 –40 –16 –40 –32 –80 –32 –80 –48 –120 –48 –120 –64 –160 –64 –200 –80 1k CROSS FREQUENCY: 78kHz PHASE MARGIN: 50° –80 1k 10k 100k 1M FREQUENCY (Hz) 200 64 160 48 120 32 80 16 40 0 0 –16 –40 –32 –80 –48 –120 –64 –160 CROSS FREQUENCY: 61kHz PHASE MARGIN: 54° –80 1k 10k PHASE (Degrees) 80 –200 100k 1M FREQUENCY (Hz) 10k –200 100k 1M FREQUENCY (Hz) Figure 48.
PAGE 15
Data Sheet ADP2119/ADP2120 FUNCTIONAL BLOCK DIAGRAM PVIN EN VIN ADP2119/ ADP2120 PMOS CURRENT SENSE AMPLIFIER ZCOMP TRK 0.6V SOFT START UVLO ERROR AMPLIFIER SKIP COMPARATOR Gm PWM AND PROTECTION LOGIC CONTROL PFET SW SKIP MODE THRESHOLD FB NFET 0.66V SLOPE COMPENSATION CLK NMOS CURRENT SENSE AMPLIFIER 0.54V PGOOD ZERO-CROSSING COMPARATOR SYNC/MODE Figure 49. Functional Block Diagram Rev.
PAGE 16
ADP2119/ADP2120 Data Sheet THEORY OF OPERATION The ADP2119/ADP2120 are step-down, dc-to-dc regulators that use a fixed frequency, peak current mode architecture with integrated high-side switch and low-side synchronous rectifier. The high switching frequency and tiny 10-lead, 3 mm × 3 mm LFCSP_WD package provide a small step-down dc-to-dc regulator solution.
PAGE 17
Data Sheet ADP2119/ADP2120 TRACKING OVERVOLTAGE PROTECTION (OVP) The ADP2119/ADP2120 have a tracking input, TRK, that allows the output voltage to track another voltage (master voltage). The tracking input is especially useful in core and I/O voltage tracking for FPGAs, DSPs, and ASICs. The output voltage is continuously monitored by a comparator through the FB pin, which is at 0.6 V (typical) under normal operation. This comparator is set to activate when the FB voltage exceeds 0.
PAGE 18
ADP2119/ADP2120 Data Sheet APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL The ADP2119/ADP2120 are supported by ADIsimPower design tool set. ADIsimPower is a collection of tools that produce complete power designs optimized for a specific design goal. The tools enable the user to generate a full schematic, bill of materials, and calculate performance in minutes.
PAGE 19
Data Sheet ADP2119/ADP2120 Table 6. Recommended L and COUT Values for the ADP2120 COUT (µF) 22 + 10 22 + 10 22 + 10 10 + 10 10 + 10 22 + 10 22 + 10 22 + 10 10 + 10 10 + 10 10 + 10 VMASTER ADP2119/ ADP2120 VSLAVE RTRKT TRK RTRKB RTOP FB RBOT Figure 51. Voltage Tracking A common application is coincident tracking (see Figure 52). Coincident tracking limits the slave output voltage to be the same as the master voltage until it reaches regulation.
PAGE 20
ADP2119/ADP2120 Data Sheet TYPICAL APPLICATION CIRCUITS C1 0.1µF VOUT 1.2V 2A CIN 22µF X5R 6.3V COUT1 22µF X5R 6.3V R1 10Ω L 1.5µH COUT2 22µF X5R 6.3V RTOP 10kΩ ADP2119 1 VIN 2 PVIN 3 SW 4 PGND 5 GND RBOT 10kΩ EN 10 SYNC/MODE 9 PGOOD 8 R2 10kΩ TRK 7 FB 6 08716-054 VIN 5V L: CDRH5D18BHPNP-1R5M SUMIDA CIN, COUT1, COUT2: GRM31CR60J226KE19 MURATA Figure 54. 1.2 V, 2 A, Step-Down Regulator, Forced Continuous Conduction Mode (ADP2119) C1 0.1µF CIN 22µF X5R 6.
PAGE 21
Data Sheet ADP2119/ADP2120 C1 0.1µF VIN 5V CIN 22µF X5R 6.3V VOUT 2.5V 2A R1 10Ω ADP2119 L 1.5µH COUT 22µF X5R 6.3V RTOP 47.5kΩ 1 VIN 2 PVIN 3 SW 4 PGND 5 GND EXTERNAL CLOCK SYNC/MODE 9 PGOOD 8 R2 10kΩ TRK 7 FB 6 08716-056 RBOT 15kΩ EN 10 L: CDRH5D18BHPNP-1R5M SUMIDA CIN, COUT: GRM31CR60J226KE19 MURATA Figure 56. 2.5 V, 2 A, Step-Down Regulator, Synchronized to External Clock (ADP2119) C1 0.1µF VIN 5V VOUT 1.5V 1.25A CIN 22µF X5R 6.3V COUT1 22µF X5R 6.3V R1 10Ω ADP2120 L 2.
PAGE 22
ADP2119/ADP2120 Data Sheet OUTLINE DIMENSIONS 2.48 2.38 2.23 3.10 3.00 SQ 2.90 0.50 BSC 6 10 PIN 1 INDEX AREA 5 TOP VIEW 0.80 0.75 0.70 0.30 0.25 0.20 1 BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 PIN 1 INDICATOR (R 0.15) FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. 02-27-2012-B 0.50 0.40 0.30 SEATING PLANE 1.74 1.64 1.49 EXPOSED PAD 0.20 REF Figure 59.
PAGE 23
Data Sheet ADP2119/ADP2120 NOTES Rev.