Datasheet ADP2230 (Analog Devices)

Dual 2 MHz, 800 mA, Synchronous, Low Quiescent Current Buck Regulator Data Sheet ADP2230 FEATURES TYPICAL APPLICATION CIRCUIT Input voltage range: 2.3 V to 6.5 V Fixed and adjustable output voltage options ADP2230 L1 Fixed output voltage pair options: 1.2 V/1.8 V, 1.2 V/3.3 V, 2.2µH VIN 2 VIN1 SW1 1 VOUT1 1.8 V/3.3 V CIN 9 VIN2 10µF Adjustable output voltage range: 0.8 V to 6 V FB1 3 COUT1 10µF Minimum guaranteed continuous output current: 800 mA ON 4 EN1 Up to 94% efficiency OFF L2 ON 2.2µH Low quiescent current of 15 µA for both channels in power 7 EN2 OFF SW2 10 VOUT2 saving mode (PSM) PWM FB2 8 C Low shutdown current: 0.1 μA (typical) 6 SYNC OUT2 PSM/PWM PGND 10µF 100% duty cycle for low dropout operation AGND (EPAD) 5 11 SYNC pin switching frequency options
001
2 MHz fixed pulse-width modulation (PWM) mode
10705-
2 MHz PSM/PWM automatic transitioning mode
Figure 1. Fixed Output Voltage Typical Application Circuit
External clock synchronization from 1.5 MHz to 2.5 MHz Enable input with precision thresholds for each output 180° phase shifted PWM outputs for minimum V IN ripple Current-limit and thermal shutdown (TSD) protection Quick output discharge (QOD) 10-lead, 3 mm × 3 mm × 0.75 mm LFCSP package APPLICATIONS
During logic control ed shutdown, the input is disconnected
Portable and battery-powered equipment
from the output, and it draws less than 0.1 μA from the input
Automatic meter readers (WSN)
source. The ADP2230 operates from input voltages from 2.3 V
Point of sales and transaction processing instruments
to 6.5 V, allowing the use of multiple alkaline, NiMH, or lithium
Mobile phones
cel s and other standard power sources.
Digital cameras and audio devices Medical instruments
The ADP2230 offers multiple options for setting the operating
Medium format display tablets and pads
frequency. To maximize light load efficiency, the ADP2230 can operate at a reduced switching frequency in PSM and switch
GENERAL DESCRIPTION
automatically to PWM as the load increases. The ADP2230 can The ADP2230 includes two high efficiency, low quiescent current, be forced to operate at 2 MHz in PWM only mode when noise 800 mA, step-down, dc-to-dc converters in a small, 10-lead, considerations are more important than efficiency. The 3 mm × 3 mm, LFCSP package. The total solution requires only ADP2230 can also be synchronized with a 1.5 MHz to 2.5 MHz five tiny external components. When the ADP2230 is used with external clock via the SYNC pin. When using the external clock three 0603 capacitors and two 2 mm × 2 mm inductors, the synchronization control, both buck outputs operate in phase total solution size is about 48 mm2, resulting in the smallest with the applied clock signal. footprint solution to meet a variety of portable applications. The ADP2230 includes an internal power switch, synchronous The ADP2230 buck regulator uses a proprietary, high speed, rectifier, and compensation to minimize external part count current mode, constant frequency, PWM control scheme for and maximize efficiency. Other key protection features include excellent stability and transient response. The buck outputs undervoltage lockout to prevent deep battery discharge, internal operate out of phase to reduce the input current ripple. soft start to prevent input current overshoot at startup, and an To ensure the longest battery life in portable applications, the integrated, switched resistor, QOD function that automatically ADP2230 has a power saving variable frequency mode that discharges the output when the device is disabled. Short-circuit reduces the switching frequency under light load conditions. protection and thermal overload protection circuits prevent damage in adverse conditions.
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS RECOMMENDED COMPONENT SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL DATA THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION OVERVIEW OPERATING CONDITIONS Input Voltage Output Voltage SYNC PIN CONTROL SCHEMES PWM Mode PSM/PWM Automatic Transitioning Mode External Clock Synchronization FEATURES DESCRIPTIONS Precision Enable Quick Output Discharge Output Short-Circuit Protection Undervoltage Lockout Thermal Shutdown Soft Start Current Limit 100% Duty Cycle APPLICATIONS INFORMATION SETTING THE OUTPUT VOLTAGE SELECTING THE INDUCTOR SELECTING THE INPUT AND OUTPUT CAPACITORS Input Capacitor Output Capacitor PCB LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE