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ADP2121:  600 mA, 6 MHz Synchronous Step-Down DC-to-DC Converter

The ADP2121 is a high frequency, low quiescent current, step-down, dc-to-dc converter optimized for portable applications in which board area and battery life are critical constraints. Fixed frequency operation at 6 MHz enables the use of tiny ceramic inductors and capacitors. Additionally the synchronous rectifica-tion improves efficiency and results in fewer external components. At high load ...More

ADP2121:  600 mA, 6 MHz Synchronous Step-Down DC-to-DC Converter

Product Description

The ADP2121 is a high frequency, low quiescent current, step-down, dc-to-dc converter optimized for portable applications in which board area and battery life are critical constraints. Fixed frequency operation at 6 MHz enables the use of tiny ceramic inductors and capacitors. Additionally the synchronous rectifica-tion improves efficiency and results in fewer external components. At high load currents, the device uses a voltage regulating pulse-width modulation (PWM) mode that maintains a constant frequency with excellent stability and transient response. At light load conditions, the ADP2121 can automatically enter a power saving mode that utilizes pulse frequency modulation (PFM) to reduce the effective switching frequency and ensure the longest battery life in portable applications. During logic controlled shutdown (EN ≤ 0.4 V), the input is disconnected from the output and draws less than 0.3 μA current (typical) from the source.

The ADP2121 has an input voltage range of 2.3 V to 5.5 V allowing the use of a single Li+/Li-polymer cell, 3-cell alkaline or Ni-MH cell, and other standard power sources. The converter is internally compensated to minimize external components, and the 1.82 V fixed output voltage can source up to 600 mA. Other key features include undervoltage lockout (UVLO) to prevent deep-battery discharge and soft start to prevent input current overshoot at startup.

Applications

    Mobile phones
    Digital cameras
    Digital audio
    Portable equipment
    1-cell Li+/Li-polymer and 3-cell alkaline/nickel
    [Geared for applications powerd by these batteries]

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  • Peak efficiency: 92%
  • Operating frequency: 6 MHz
  • Typical quiescent current in auto mode: 36 μA
  • Fixed output voltage: 1.82 V
  • Maximum guaranteed load current: 600 mA at VIN ≥ 2.7 V
  • Input voltage: 2.3 V to 5.5 V
  • Typical shutdown supply current: 0.3 μA
  • Automatic power-saving mode
  • Compatible with tiny multilayer inductors
  • Please see data sheet for additional features
  • Vin Range: 2.3V-5.5V
  • Boost: No
  • Buck: Yes
  • Inverting: No
  • Iout (max): 0.5A
  • Supply Current : 36µA
  • Switching Frequency: 6 MHz
  • Vout Preset Summary: 4 Options/1.8V-1.875V
  • Vout Adj Options: ---

ADP2121 Typical Application Diagram

ADP2121 Typical Application Diagram
ADP2121 Typical Application Diagram

Of Note . . .

The 1.82 V output voltage option is released to manufacturing. Additional fixed output voltage options are available for sampling but have not yet been released. Please contact the Power Management Group for additional technical information & sample availability or to request samples.

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Part# Vin Range Vout Preset Summary Vout Adj Options Iout (max) Isw (Peak) Supply Current Switching Frequency Step Down Step Up Inverting Pkg Product Description Price* (1000-4999) Pos Supply
ADP1612 1.8V-5.5V --- Vin to 20V 1.4A 1.4A 900µA 650 KHz, 1.3 MHz No Yes No MSOP-8 650 kHz /1.3 MHz Step-Up DC-to-DC Converter $0.78 +1.8 to +5.5
ADP1613 2.5V-5.5V --- Vin to 20V 2A 2A 900µA 650 kHz, 1.3 MHz No Yes No MSOP-8 650 kHz /1.3 MHz Step-Up DC-to-DC Converter $0.70 +2.5 to +5.5
ADP2109 2.3V-5.5V 4 Options/1.0V-1.8V --- 0.6A 1.3A 18µA 3 MHz Yes No No WLCSP-5 Compact 600 mA, 3 MHz, Step-Down Converter w/ Output Discharge $0.70 +2.3 to +5.5
ADP2121 2.3V-5.5V 4 Options/1.8V-1.875V --- 0.5A 1A 36µA 6 MHz Yes No No WLCSP-6 600 mA, 6 MHz, Synchronous, Step-Down, DC-to-DC Converter $0.80 +2.3 to +5.5
ADP1111 2V-30V 3 Options/3.3V-12V 1.2V to 30V, 1.2V to Vin 1.5A 1.5A 110µA 70 kHz Yes Yes Yes Plastic DIP-8, SOIC-8 Micropower Step Up/Down/Inverting Switching Regulator; Adjustable or Fixed 3.3V, 5V, 12V $2.05 +2 to +30
ADP2108 2.3V-5.5V 11 Options/1V-3.3V --- 0.6A 1.3A 19µA 3 MHz Yes Yes No WLCSP-5 600 mA, 3 MHz Fast Transient Synchronous Step-Down Converter $0.60 +2.3 to +5.5
ADP2504 2.3V-5.5V 6 Options/2.8V-5V --- 1A 1.3A 38µA 2.5 MHz Yes Yes No LFCSP-10 1 Ampere, 2.5 MHz Buck-Boost DC-to-DC Converter $1.40 +2.3 to +5.5
ADP1611 2.5V-5.5V - Vin to 20V 1.2A 1.2A 600µA 1.2 MHz - Yes - MSOP-8 20 V,1.2 MHz Step-Up DC-to-DC Switching Converter - +2.5 to +5.5
ADP1610 2.5V-5.5V - Vin to 12V 1.2A 1.2A 600µA 700 kHz or 1.2 MHz No Yes No MSOP-8 1.2 MHz DC-DC Step-Up (Boost) Switching Converter w/ Integrated Power Switch $1.12 +2.5 to +5.5
ADP2102 2.7V-5.5V 8 Options/0.8V-1.875V 0.8V to 3.3V 0.6A 1A 99µA 3 MHz Yes No No LFCSP-8 3 MHz Synchronous Step-Down DC-to-DC Converter $1.23 +2.7 to +5.5
ADP3051 2.7V-5.5V --- 0.8V to 5.5V 0.5A 1A 300µA 550 kHz Yes No No MSOP-8 500 mA PWM Step-Down DC-DC Converter with Synchronous Rectifier - +2.7 to +5.5
ADP2105 2.7V-5.5V 4 Options/1.2V-3.3V 0.8V to Vin 1A 1.5A 30µA 1.2 MHz Yes No No LFCSP-16 1A Synchronous Step-Down DC-DC Converter $1.13 +2.7 to +5.5
ADP2106 2.7V-5.5V 4 Options/1.2V-3.3V 0.8V to Vin 1.5A 2.25A 30µA 1.2 MHz Yes No No LFCSP-16 1.5A Synchronous Step-Down DC-DC Converter $1.25 +2.7 to +5.5
ADP2107 2.7V-5.5V 4 Options/1.2V-3.3V 0.8V to Vin 2A 2.9A 30µA 1.2 MHz Yes No No LFCSP-16 2A Synchronous Step-Down DC-DC Converter $1.32 +2.7 to +5.5
ADP2503 2.3V-5.5V 6 Options/2.8V-5V --- 0.6A 1A 38µA 2.5 MHz Yes Yes No LFCSP-10 600 mA, 2.5 MHz Buck-Boost DC-to-DC Converter $1.30 +2.8 to +5.5
ADP3050 3.6V-30V 2 Options/3.3V & 5V 1.25V to 12V 1A 1.5A 1.5mA 200 kHz Yes No No SOIC-8 200 kHz, 1 Amp, High-Voltage Step-Down Switching Regulator $1.81 +3.6 to +30
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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.