A Product Line of Diodes Incorporated PAM2322AGEAR Dual High-Efficiency PWM Step-Down DC-DC Converter Description Pin Assignments The PAM2322AGEAR is a dual step-down current-mode, DC-DC converter. At heavy load, the constant-frequency PWM control performs with excellent stability and transient response. To ensure the longest battery life in portable applications, the PAM2322AGEAR provides a power-saving Pulse-Skipping Modulation (PSM) mode to reduce quiescent current under light load operation The PAM2322AGEAR supports a range of input voltages from 2.7V to 5.5V, allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH cell, USB, and other standard power sources. Output 1 is a 1.8V fixed output. Output 2 is adjustable from 0.9V to VIN. Both outputs employ an internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. Output 1 delivers up to 1000mA output current while output 2 delivers up to 2000mA. Each regulator has an independent enable pin. Each output of the PAM2322AGEAR can be disabled when a logic low is applied to the channel enable pin. During shutdown, the input is disconnected from the output and the shutdown current is less than 0.1A W-FLGA2520-17 Other key features include under-voltage lockout, soft-start, hiccup mode short circuit protection and thermal shutdown. Applications Features Portable Electronics Supply Voltage:2.7V to 5.5V Personal Information Appliances Output Current: Wireless and DSL Modems OUT1: 1000mA/Buck, 1.8V Fixed Output OUT2: 2000mA/Buck Switching Frequency:1.2MHz Internal Synchronous Rectifier Fast Transient Response Fast Turn On and Turn Off Internal Soft Start Internal Compensation 100% Duty Cycle Operation Power Good Indicator for OUT1 Under-Voltage Lockout Hiccup Mode Short Circuit Protection Thermal Shutdown Small W-FLGA2520-17 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See A Product Line of Diodes Incorporated PAM2322AGEAR Typical Applications Circuit L1 VOUT1 1.5H 1.8V VIN SW1 3.3V COUT1 VIN OUT1 10uF CIN CIN 10uF 10uF PG1 EN1 PG1 EN1 EN2 PAM2322 EN2 L2 VOUT2 1.0H 1.22V SW2 COUT2 COUT2 GND OUT2 10uF 10uF Rfb up 205k FB2 Rfb dn 200k Pin Descriptions Function W-FLGA2520-17 Name 1, 15 SW2 Switch PIN for Output 2, PIN 1 and 15 can be connected on the PCB 2, 9, 16, 17 GND Ground pin, PIN 2, 9, 16, 17 can be connected on the PCB 3 OUT2 Output sense pin of Output 2 4 FB2 Feedback pin for Output 2, the reference is set internally to 0.6V 5 EN2 Enable for Output 2. Pull high to enable channel 2. Pull low to disable 6 PG1 Output 1 power good indicator pin, open drain output 7 EN1 Enable for Output 1. Pull high to enable channel 1. Pull low to disable 8 OUT1 Output pin of Output 1, Channel one is internally fixed to 1.8V 10 SW1 Switch Pin for Output 1 11, 12, 13, 14 VIN Input voltage pin. PIN 11, 12, 13, 14 can be connected on the PCB 2 of 13 PAM2322AGEAR September 2014 Diodes Incorporated www.diodes.com Document Number: DS36234 Rev. 2 - 2 ADVANCED INFORMATION