Datasheet

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650 kHz/1.3 MHz, 4 A, Step-Up,

PWM, DC-to-DC Switching Converter

Data Sheet

ADP1614

Rev. A Document Feedback

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FEATURES

Adjustable and fixed current-limit options:

Adjustable up to 4 A

Fixed 3 A

2.5 V to 5.5 V input voltage range

650 kHz or 1.3 MHz fixed frequency option

Adjustable output voltage, up to 20 V

Adjustable soft start

Undervoltage lockout

Thermal shutdown

3 mm × 3 mm, 10-lead LFCSP

Supported by ADIsimPower design tool

APPLICATIONS

TFT LCD bias supplies

Portable applications

Industrial/instrumentation equipment

GENERAL DESCRIPTION

The ADP1614 is a step-up, dc-to-dc switching converter with

an integrated power switch capable of providing an output

voltage as high as 20 V. The ADP1614 is available with a pin-

adjustable current limit that is set via an external resistor with

the boost switching frequency fixed to either 650 kHz or 1.3 MHz.

Alternatively, the ADP1614 is also available with fixed 3 A current

limit and a pin-selectable frequency. With a package height of

0.8 mm, the ADP1614 is optimal for space constrained

applications, such as portable devices or thin film transistor (TFT)

liquid crystal displays (LCDs).

The ADP1614 operates in current-mode pulse-width modulation

(PWM) with up to 94% efficiency. Adjustable soft start prevents

inrush currents when the part is enabled. The PWM current-mode

architecture allows excellent transient response, easy noise filtering,

and the use of small, cost-saving external inductors and capacitors.

Other key features include undervoltage lockout (UVLO), thermal

shutdown (TSD), and logic controlled enable.

The ADP1614 is available in a Pb-free, 10-lead lead frame chip

scale package (LFCSP).

TYPICAL APPLICATIONS CIRCUITS

ADP1614

ADJUSTABLE

CURRENT

LIMIT

VIN

CLRES

COMP

OFF

GND

OUT

COMP

10293-001

Figure 1. Step-Up Regulator Configuration for Adjustable Current-Limit Options

ADP1614

FIXED

CURRENT

LIMIT

VIN

FREQ

COMP

OFF

1.3MHz

650kHz

(DEFAULT)

GND

OUT

COMP

10293-201

Figure 2. Step-Up Regulator Configuration for Fixed Current-Limit Options

Summary of content (20 pages)

PAGE 1
FEATURES TYPICAL APPLICATIONS CIRCUITS L1 Adjustable and fixed current-limit options: Adjustable up to 4 A Fixed 3 A 2.5 V to 5.5 V input voltage range 650 kHz or 1.
PAGE 2
ADP1614 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Soft Start ...................................................................................... 13 Applications ....................................................................................... 1 Thermal Shutdown (TSD) ........................................................ 13 General Description ........................................................
PAGE 3
Data Sheet ADP1614 SPECIFICATIONS VIN = 3.6 V, unless otherwise noted. Minimum and maximum values are guaranteed for TJ = −40°C to +125°C. Typical values specified are at TJ = 25°C. All limits at temperature extremes are guaranteed by correlation and characterization using standard statistical quality control (SQC), unless otherwise noted. Table 1.
PAGE 4
ADP1614 Parameter THERMAL SHUTDOWN Thermal Shutdown Threshold Thermal Shutdown Hysteresis Data Sheet Symbol Test Conditions/Comments Min Typ 150 20 Max Unit °C °C This parameter specifies the average current when the device switches internally with the SW pins (Pin 6 and Pin 7) grounded. Guaranteed by design. Current limit is a function of duty cycle. For the adjustable current limit versions, it is also a function of the resistor on the CLRES pin. See Figure 10 through Figure 13.
PAGE 5
Data Sheet ADP1614 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter VIN, EN, FB, FREQ to GND CLRES to GND COMP to GND SS to GND SW to GND Operating Junction Temperature Range Storage Temperature Range Soldering Conditions Rating −0.3 V to +6 V −0.3 V to VIN 1.0 V to 1.6 V −0.3 V to +1.3 V 21 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
ADP1614 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS COMP 1 ADP1614 9 CLRES/FREQ EN 3 TOP VIEW (Not to Scale) 8 VIN GND 4 7 SW GND 5 6 SW NOTES 1. THE EXPOSED PAD IS NOT ELECTRICALLY CONNECTED; CONNECT THIS PAD TO A GROUND PLANE FOR BETTER HEAT DISTRIBUTION. 10293-002 10 SS FB 2 Figure 3. Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 Mnemonic COMP 2 FB 3 4, 5 6, 7 EN GND SW 8 VIN 9 CLRES/FREQ 10 SS 11 EP Description Compensation Input.
PAGE 7
Data Sheet ADP1614 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 VIN = 5V fSW = 1.3MHz RCL = 71.5kΩ 90 90 80 80 70 70 EFFICIENCY (%) 60 50 40 30 40 20 1 100 10 1k 10k LOAD CURRENT (mA) ADP1614ACPZ-1.3-R7 0 10293-003 0 VOUT = 10V VOUT = 15V VOUT = 20V 10 1 10 1k 100 10k LOAD CURRENT (mA) Figure 4. Efficiency vs. Load Current, VIN = 3.6 V, fSW = 650 kHz 10293-006 VOUT = 5V VOUT = 10V VOUT = 15V VIN = 3.6V fSW = 650kHz RCL = 71.5kΩ 10 Figure 7. Efficiency vs.
PAGE 8
ADP1614 Data Sheet 3.60 4.0 ADP1614ACPZ-650-R7 ADP1614ACPZ-1.3-R7 VIN = 4.5V TA = –40°C 3.5 3.50 VIN = 2.5V TA = +25°C CURRENT LIMIT (A) CURRENT LIMIT (A) ADP1614ACPZ-650-R7 ADP1614ACPZ-1.3-R7 3.55 3.0 2.5 VIN = 3.5V 2.0 3.45 3.40 TA = +85°C 3.35 3.30 3.25 3.20 V OUT = 15V RCL = 71.5kΩ 3.15 2.5 3.0 75 90 105 120 135 150 RCL (kΩ) Figure 10. Peak Current Limit of Switch vs. RCL, VOUT = 5 V 3.5 4.0 4.5 4.0 Figure 13. Peak Current Limit of Switch vs.
PAGE 9
Data Sheet ADP1614 7 760 6 740 TA = +125°C 700 680 TA = +25°C 660 5 EN PIN CURRENT (µA) 720 640 TA = +125°C 4 3 TA = –40°C 2 TA = –40°C TA = +25°C 620 1 580 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) 0 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Figure 19. EN Pin Current vs. EN Pin Voltage 6.0 VIN = 2.5V 5.8 4.0 3.5 TA = +25°C VIN = 5.5V SS PIN CURRENT (µA) TA = +125°C TA = –40°C 3.0 5.6 VIN = 3.6V 5.4 5.2 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) 4.
PAGE 10
ADP1614 Data Sheet VIN = 5V VOUT = 15V OUTPUT VOLTAGE (200mV/DIV) AC-COUPLED fSW = 1.3MHz L = 10µH VIN = 3.6V VOUT = 5V OUTPUT VOLTAGE (100mV/DIV) fSW = 650kHz AC-COUPLED L = 4.7µH 1 1 LOAD CURRENT (50mA/DIV) LOAD CURRENT (50mA/DIV) TIME (200µs/DIV) 10293-023 3 10293-020 3 TIME (200µs/DIV) Figure 22. 50 mA to 150 mA Load Transient, VIN = 3.6 V, VOUT = 5 V, fSW = 650 kHz Figure 25. 50 mA to 150 mA Load Transient, VIN = 5 V, VOUT = 15 V, fSW = 1.3 MHz 100 VIN = 3.
PAGE 11
Data Sheet ADP1614 1.7 660 fSW = 650kHz 650 SWITCHING FREQUENCY (kHz) 1.5 1.3 1.1 0.9 0.7 VOUT = 8V VOUT = 12V 0.3 2.5 3.0 3.5 4.0 4.5 5.0 640 620 610 600 590 5.5 INPUT VOLTAGE (V) 580 2.5 3.5 4.0 4.5 5.0 5.5 Figure 30. Frequency vs. Input Voltage, fSW = 650 kHz 1.30 3.30 fSW = 1.3MHz TA = –40°C TA = +25°C TA = +85°C 3.20 1.28 SWITCHING FREQUENCY (MHz) 3.25 3.15 3.10 3.05 3.00 2.95 2.90 3.5 4.0 4.5 INPUT VOLTAGE (V) 5.0 5.5 10293-129 3.
PAGE 12
ADP1614 Data Sheet THEORY OF OPERATION tiny external components. The switch current is monitored on a pulse-by-pulse basis to limit the current to the value set by the RCL resistor on the CLRES pin on the adjustable current-limit version or to 3 A typical on the fixed current-limit version. The ADP1614 current-mode, step-up switching converter boosts a 2.5 V to 5.5 V input voltage to an output voltage as high as 20 V. The internal switch allows a high output current, and the 650 kHz/1.
PAGE 13
Data Sheet ADP1614 CURRENT-MODE PWM OPERATION SOFT START The ADP1614 utilizes a current-mode PWM control scheme to regulate the output voltage over all load conditions. The output voltage is monitored at FB through a resistive voltage divider. The voltage at FB is compared with the internal 1.245 V reference by the internal transconductance error amplifier to create an error voltage at COMP. The current of the switch is internally measured and added to the stabilizing ramp.
PAGE 14
ADP1614 Data Sheet APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL The ADP1614 is supported by the ADIsimPower™ design toolset. ADIsimPower is a collection of tools that produce complete power designs that are optimized for a specific design goal. The tools enable the user to generate a full schematic and bill of materials and to calculate performance in minutes.
PAGE 15
Data Sheet ADP1614 CHOOSING THE INPUT AND OUTPUT CAPACITORS The ADP1614 requires input and output bypass capacitors to supply transient currents while maintaining constant input and output voltages. Use low equivalent series resistance (ESR) capacitors of 10 µF or greater to prevent noise at the ADP1614 input. Place the capacitor between VIN and GND, as close as possible to the ADP1614. Ceramic capacitors are preferable because of their low ESR characteristics.
PAGE 16
ADP1614 Data Sheet To determine the crossover frequency, it is important to note that at the crossover frequency the compensation impedance (ZCOMP) is dominated by a resistor, and the output impedance (ZOUT) is dominated by the impedance of an output capacitor.
PAGE 17
Data Sheet ADP1614 PCB LAYOUT GUIDELINES For high efficiency, good regulation, and stability, a well designed PCB layout is required. • • • • • • • • Keep the low ESR input capacitor (CIN), which is labeled as C4 in Figure 35, close to VIN and GND. This minimizes noise injected into the part from board parasitic inductance. Keep the high current path from CIN through the L1 inductor to SW and GND as short as possible.
PAGE 18
ADP1614 Data Sheet OUTLINE DIMENSIONS 2.48 2.38 2.23 3.10 3.00 SQ 2.90 0.50 BSC 10 6 PIN 1 INDEX AREA 1.74 1.64 1.49 EXPOSED PAD 0.50 0.40 0.30 1 5 BOTTOM VIEW 0.80 0.75 0.70 SEATING PLANE 0.30 0.25 0.20 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 MIN 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. 02-05-2013-C TOP VIEW 0.20 REF Figure 37.
PAGE 19
Data Sheet ADP1614 NOTES Rev.