ADP2105:  1 Amp Synchronous, Step-Down DC-to-DC Converter

The ADP2105/ADP2106/ADP2107 are low quiescent current, synchronous, step-down dc-to-dc converters in a compact 4 mm × 4 mm LFCSP_VQ package. At medium to high load currents, these devices use a ...More

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ADP2105:  1 Amp Synchronous, Step-Down DC-to-DC Converter

Product Description

The ADP2105/ADP2106/ADP2107 are low quiescent current, synchronous, step-down dc-to-dc converters in a compact 4 mm × 4 mm LFCSP_VQ package. At medium to high load currents, these devices use a current-mode, constant-frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP2105/ADP2106/ADP2107 use a pulse frequency modulation (PFM) control scheme under light load conditions that reduces switching frequency to save power.

The ADP2105/ADP2106/ADP2107 run from input voltages of 2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple alkaline/NiMH cells, PCMCIA, and other standard power sources. The output voltage of ADP2105/ADP2106/ADP2107-ADJ is adjustable from 0.8 V to the input voltage, whereas the ADP2105/ADP2106/ADP2107-xx are available in preset output voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V. Each of these variations is available in three maximum current levels, 1 A (ADP2105), 1.5 A (ADP2106), and 2 A (ADP2107). The power switch and synchronous rectifier are integrated for minimal external part count and high efficiency. During logic-controlled shutdown, the input is disconnected from the output, and it draws less than 0.1 μA from the input source. Other key features include undervoltage lockout to prevent deep battery discharge and programmable soft start to limit inrush current at startup.

Applications

  • Mobile handsets
  • Portable media players
  • PDAs and palmtop computers
  • Digital Cameras
  • Smart Phones
  • GPS

    • Data Sheet, Rev. A, 3/07

    Features

    • Extremely high 97% peak efficiency
    • Internal primary and synchronous switches
    • Fixed Frequency, Peak Current-Mode PWM at medium and high loads
    • PSM operation at light loads for high efficiency
    • Ultralow quiescent current: 30μA (max)
    • Internally Set Current Limit
    • Internal Thermal Protection
    • 0.1 μA shutdown supply current (typ)
    • Maximum duty cycle 100%
    • Smoothly transitions into low dropout
      (LDO) mode
    • Small 16-lead 4 mm × 4 mm
      LFCSP_VD package
    • Optimized for small ceramic output capacitors

    Diagrams

    ADP2105 Diagram
    Typical Application Circuit Diagram for ADP2105

    技术指标

    Vin Range 2.7V-5.5V
    Boost No
    Buck Yes
    Inverting No
    Iout (max) 1A
    Supply Current (max) 30µA
    Switching Frequency 1.2 MHz
    Vout Preset Summary 4 Options/1.2V-3.3V
    Vout Adj Options 0.8V to Vin

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    订阅新产品资料
    Part# Vin Range Vout Preset Summary Vout Adj Options Iout (max) Isw (Peak) Supply Current (max) Switching Frequency Step Down Step Up Inverting Pkg Product Description Price* (1000-4999) Pos Supply
    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 $0.80 +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 $1.20 +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 $2.65 +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