PAM2308 Datasheet | Power Analog Micoelectronics

Dual High-Efficiency PWM Step-Down DC-DC Coverter Features n Efficiency up to 96% n Only 40μA(Typ. per Channel) Quiescent Current n Output Current: Up to 1A per Channel n Internal Synchronous Rectifier n 1.5MHz Switching Frequency n Soft Start n Under-Voltage Lockout n Short Circuit Protection n Thermal Shutdown n Small 10L WDFN 3x3 Packages n Pb-Free Package and Ro HS pliant General Description The PAM2308 is a dual step-down current-mode, DC-DC converter. At heavy load, the constantfrequency PWM control performs excellent stability and transient response. To ensure the longest battery life in portable applications, the PA M 2 3 0 8 p r o v i d e s a p o w e r - s a v i n g P u l s e Skipping Modulation (PSM) mode to reduce quiescent current under light load operation. The PAM2308 supports a range of input voltages from 2.5V to 5.5V, allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/Ni MH cell, USB, and other standard power sources. The dual output voltages are available for 3.3V, 2.8V, 2.5V, 1.8V, 1.5V, 1.2V or adjustable. All versions employ internal power switch and synchronous rectifier for to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 0.1 μ A. Other key Features include under-voltage lockout to prevent deep battery discharge. Applications n n n n n Cellular Phone Portable Electronics Personal Information Appliances Wireless and DSL Modems MP3 Players Typical Application L1 V OUT1 C OUT1 10μF .. C Fw1 100n F R11 1 EN1 FB1 PAM2308 LX1 VIN1 GND 10 8 9 C IN1 4. 7 μF V IN1 R12 R22 CIN2 4. 7μF V IN2 GND VIN2 LX2 L2 FB2 7 6 EN2 R21 C FW2 100p F V OUT2 C OUT2 10μF VOUTx = VREF 1 + Rx1 Rx2 Figure 1. Adjustable Voltage Regulator ( ) Power Analog Microelectronics , Inc .poweranalog. 1 07/2008 Rev 1.0 Dual High-Efficiency PWM Step-Down DC-DC Coverter Typical...