ADPL21610

ADPL21610 (Rev. 0)

Document overview

• Manufacturer or author: Analog Devices, Inc.
• PDF pages: 15

Technical content

Features

• 1.3MHz Switching Frequency
• Low VCESAT Switch: 330mV at 1.1A
• High Output Voltage: Up to 40V
• Wide Input Range: 2.7V to 16V
• Dedicated Soft-Start Pin
• Uses Small Surface Mount Components
• Low Shutdown Current: <1µA
• Low Profile (1mm) ThinSOT™ Package
• Low Profile (0.75mm) 8-Lead (3mm × 2mm) Dual Flat No Lead (DFN) Package

Applications

• Digital Cameras
• White LED Power Supplies
• Cellular Phones
• Medical Diagnostic Equipment
• Local 5V or 12V Supplies
• Thin Film Transistor (TFT)- Liquid Crystal Display (LCD) Bias Supplies
• x Digital Subscriber Line (xDSL) Power Supplies

Description

The ADPL21610 switching regulators combine a 42V, 1.1A switch with a soft-start function. The ADPL21610 switches at 1.3MHz, allowing the use of tiny, low-cost and low-height inductors and capacitors. High inrush current at start-up is eliminated using the programmable soft-start function. A single external capacitor sets the current ramp rate. A constant-frequency current mode pulse-width modulator (PWM) architecture results in low, predictable output noise that is easy to filter. The high-voltage switch on the ADPL21610 is rated at 42V, making the devices ideal for boost converters up to 40V, as well as SEPIC and flyback designs. The ADPL21610 is available in a low-profile (1mm) 6-lead Small outline transistor (SOT)-23 package and tiny 3mm × 2mm DFN package. Figure 1. Lithium-Ion to 6V Step-Up DC/DC Converter Figure 2. Efficiency vs. Load Current © 2026 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

www.analog.com Analog Devices │ 2 ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start

Operating Junction Temperature Range (Note 2) Lead Temperature (Soldering, 10 sec) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25°C. VIN = 3V, VSHDN = VIN unless otherwise noted.

Electrical Characteristics

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The ADPL21610 are guaranteed to meet performance specifications from 0°C to 85°C, junction temperature. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Operating Voltage 2.4 2.7 V Maximum Operating Voltage 16 V Feedback Voltage 1.230 1.270 V l 1.220 1.255 1.280 V FB Pin Bias Current (Note 1) l 10 50 nA Quiescent Current VSHDN = 2.4V, Not Switching 1.5 2 mA Quiescent Current in Shutdown VSHDN = 0.5V, VIN = 3V 0.01 1 µA Reference Line Regulation 2.7V ≤ VIN ≤ 16V 0.01 0.05 %/V Switching Frequency 1 1.3 1.6 MHz Maximum Duty Cycle 88 94 % l 87 % Minimum Duty Cycle 10 % Switch Current Limit At Minimum Duty Cycle At Maximum Duty Cycle (Note 2) 1.4 0.8 1.8 1.2 1.9 A A Switch VCESAT ISW = 1.1A 330 500 mV Switch Leakage Current VSW = 5V 0.01 1 µA SHDN Input Voltage High 2.7 V SHDN Input Voltage Low 0.5 V SHDN Pin Bias Current VSHDN = 3V VSHDN = 0V 0.1 µA µA SS Charging Current VSS = 0.5V 2 3 4.5 µA Note 1: Current flows out of the pin. Note 2: See Figure 6 in Typical Performance Characteristics section for guaranteed Current Limit vs. Duty Cycle. www.analog.com Analog Devices │ 3 ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start Absolute Maximum Ratings (Note 1)

6 VIN

4 SHDN

Figure 9. Pin Configurations Feedback Pin. Reference voltage is 1.255V. Connect the resistive divider tap here. Minimize the trace area at FB. 2, 5, 9 2 GND Ground. Tie directly to the local ground plane. Switch Pin. (Collector of internal Negative-positive-negative (NPN) power switch). this pin to minimize Electromagnetic interference (EMI). 6 6 VIN Input Supply Pin. Must be locally bypassed. charges the capacitor to 1.255V. Use a larger capacitor for a slower start-up. Leave floating if not in use. 8 4 SHDN Shutdown Pin. Tie to 2.4V or more to enable the device. Ground to shut down.

components connected to the ADPL21610. Figure 10. Block Diagram

VCESAT is, in the worst case, 330mV (at 1.1A). mode so that the actual duty cycle is reduced. R1 and R2 determine the output voltage. inrush current drawn from the supply upon start-up. presence of high voltage, can overstress the switch. input capacitor is sufficient for most applications. Table 2 lists several ceramic capacitor manufacturers. their entire selection of ceramic parts. Table 1. Inductor Manufacturers Table 2. Ceramic Capacitor Manufacturers

The decision to use either low ESR (ceramic) capaci - tors or the higher ESR (tantalum or OS-CON) capaci - tors can affect the stability of the overall system. The ESR of any capacitor, along with the capacitance itself, contributes a zero to the system. For the tantalum and OS-CON capacitors, this zero is located at a lower frequency due to the higher value of the ESR, while the zero of a ceramic capacitor is at a much higher frequency and can generally be ignored. A phase lead zero can be intentionally introduced by placing a capacitor (C4) in parallel with the resistor (R1) between VOUT and VFB as shown in Figure 1. The frequency of the zero is determined by the following equation. fZ = 1 2 x R1 x C4 By choosing the appropriate values for the resistor and capacitor, the zero frequency can be designed to improve the phase margin of the overall converter. The typical target value for the zero frequency is between 35kHz to 55kHz. Diode Selection A Schottky diode is recommended for use with the ADPL21610. The Philips PMEG 2005 is a very good choice. Where the switch voltage exceeds 20V, use the PMEG 3005 (a 30V diode). These diodes are rated to handle an average forward current of 0.5A. In applications where the average forward current of the diode exceeds 0.5A, a Philips PMEG 2010 rated at 1A is recommended. For higher efficiency, use a diode with better thermal characteristics such as the On Semiconductor MBRM120 (a 20V diode) or the MBRM140 (a 40V diode). Setting Output Voltage To set the output voltage, select the values of R1 and R2 (see Figure 1) according to the following equation. R1 = R2 1VOUT 1.255V – A good value for R2 is 13.3kΩ which sets the current in the resistor divider chain to 1.255V/13.3kΩ = 94µA. Layout Hints The high speed operation of the ADPL21610 demands careful attention to board layout. You will not get adver- tised performance with careless layout. Figure 11a shows the recommended component placement for the ThinSOT package. Figure 11b shows the recom - mended component placement for the DFN package. Note the vias under the Exposed Pad. These should connect to a local ground plane for better thermal per - formance. www.analog.com Analog Devices │ 8 ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start Figure 11a. Suggested Layout—ThinSOT Figure 11b. Suggested Layout—DFN GND D1 C1 VOUT VOUT VIN SHDN FB CSS SS 012a GND VOUT VOUT FB CSS VIN 012b SHDN

to understand and adjust the voltage feedback loop. is finite due to the current limit in the IC. manageable with proper external component selection. Figure 12. Boost Converter Equivalent Model

2.00 ±0.10 NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE OUTLINE M0-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.40 ±0.10 BOTTOM VIEW—EXPOSED PAD 0.56 ±0.05 0.75 ±0.05 R = 0.115 TYPR = 0.05 TYP 2.15 ±0.05 3.00 ±0.10 PIN 1 BAR TOP MARK (SEE NOTE 6)

0.200 REF

0 – 0.05 (DDB8) DFN 1116 REV C 0.25 ±0.05

0.50 BSC

R = 0.20 OR 0.25 × 45° CHAMFER 0.25 ±0.05 2.20 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.61 ±0.05 1.15 ±0.05 0.70 ±0.05 2.55 ±0.05 PACKAGE OUTLINE 8-Lead Plastic DFN (3mm × 2mm) (Reference LTC DWG # 05-08-1702 Rev C) 018 www.analog.com Analog Devices │ 11 ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start

Chip Information (continued) 1.50 – 1.75 (NOTE 4)

2.80 BSC

0.30 – 0.45

6 PLCS (NOTE 3)

DATUM ‘A’ 0.09 – 0.20 (NOTE 3) S6 TSOT-23 0302

2.90 BSC

(NOTE 4)

0.95 BSC

1.90 BSC

0.80 – 0.90

1.00 MAX

0.01 – 0.100.20 BSC 0.30 – 0.50 REF PIN ONE ID NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193

3.85 MAX

0.62 MAX 0.95 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 1.4 MIN2.62 REF

1.22 REF

(Reference LTC DWG # 05-08-1636) 019 www.analog.com Analog Devices │ 12 ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start

Consult Analog Devices’ Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, visit Material Declarations. For more information on tape and reel specifications, visit Tape and Reel Specifications. LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE ADPL21610ECPZ ADPL21610ECPZ-RL LY7 8-Lead (3mm × 2mm) Plastic DFN –40°C to 85°C ADPL21610EUJZ ADPL21610EUJZ-RL LY7 6-Lead Plastic TSOT-23 –40°C to 85°C www.analog.com Analog Devices │ 13 ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start

Ordering Information

PART NUMBER DESCRIPTION COMMENTS LT3467 1.1A (ISW), 2.1MHz, Step-Up DC/DC Converter with Integrated Soft-Start VIN: 2.4V to 16V, VOUT(MAX) = 40V, IQ = 1.2mA, ISD < 1µA, ThinSOT Package. LT1615/LT1615-1 300mA/80mA (ISW), High Efficiency Step-Up DC/DC Converter VIN: 1V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD < 1µA, ThinSOT Package LT1618 1.5A (ISW), 1.25MHz, High Efficiency Step-Up DC/DC Converter 90% Efficiency, VIN: 1.6V to 18V, VOUT(MAX) = 35V, IQ = 1.8mA, ISD < 1µA, MS Package LTC1700 No RSENSE™, 530kHz, Synchronous Step-Up DC/DC Controller 95% Efficiency, VIN: 0.9V to 5V, IQ = 200µA, ISD < 10µA, MS Package LTC1871 Wide Input Range, 1MHz, No RSENSE Current Mode Boost, Flyback and SEPIC Controller 92% Efficiency, VIN: 2.5V to 36V, IQ = 250µA, ISD < 10µA, MS Package LT1930/LT1930A 1A (ISW), 1.2MHz/2.2MHz, High Efficiency Step-Up DC/DC Converter High Efficiency, VIN: 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD < 1µA, ThinSOT Package LT1946/LT1946A 1.5A (ISW), 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converter with Soft-Start High Efficiency, VIN: 2.45V to 16V, VOUT(MAX) = 34V, IQ = 3.2mA, ISD < 1µA, MS8 Package LT1961 1.5A (ISW), 1.25MHz, High Efficiency Step-Up DC/DC Converter 90% Efficiency, VIN: 3V to 25V, VOUT(MAX) = 35V, IQ = 0.9mA, ISD < 6µA, MS8E Package LTC3400/ LTC3400B 600mA (ISW), 1.2MHz, Synchronous Step-Up DC/DC Converter 92% Efficiency, VIN: 0.85V to 5V, VOUT(MAX) = 5V, IQ = 19µA/300µA, ISD < 1µA, ThinSOT Package LTC3401 1A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38µA, ISD < 1µA, MS Package LTC3402 2A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38µA, ISD < 1µA, MS Package LT3464 85mA (ISW), High Efficiency Step-Up DC/DC Converter with Integrated Schottky and PNP Disconnect VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25µA, ISD < 1µA, ThinSOT Package www.analog.com Analog Devices │ 14 ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start

0 1/26 Initial release — ADPL21610 1.1A Step-Up DC/DC Converter with Integrated Soft-Start

Revision History

www.analog.com Analog Devices │ 15 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.