A Product Line of
Diodes Incorporated
PAM2306
DUAL HIGH-EFFICIENCY PWM STEP-DOWN DC-DC CONVERTER
Description Pin Assignments
The PAM2306 is a dual step-down current-mode, DC-DC converter.
At heavy load, the constant frequency PWM control provides
excellent stability and transient response. To ensure the longest
battery life in portable applications, the PAM2306 provides a power -
saving Pulse-Skipping Modulation (PSM) mode to reduce quiescent
current under light load operation.
The PAM2306 supports a range of input voltages from 2.5V to 5.5V,
allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH
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 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 0.1A. Other key features
include under-voltage lockout to prevent deep battery discharge.
Applications
Features
Cellular Phone
Efficiency up to 96%
Portable Electronics
Only 40A (typ per channel) Quiescent Current
Personal Information Appliances
Output Current: Up to 1A per Channel
Wireless and DSL Modems
Internal Synchronous Rectifier
MP3 Players
1.5MHz Switching Frequency
Soft Start
Under-Voltage Lockout
Short Circuit Protection
Thermal Shutdown
Small 12L WDFN3x3 Package
Pb-Free Package and RoHS Compliant
Typical Applications Circuit
Rx1
V V
OUT REF 1
Rx2
Figure 1. Adjustable Voltage Regulator
1 of 15 November 2012
PAM2306
Diodes Incorporated
www.diodes.com
Document number: DS36392 Rev. 1 - 2
A Product Line of
Diodes Incorporated
PAM2306
Typical Applications Circuit
V = 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V
OUT
Figure 2. Fixed Voltage Regulator
Pin Descriptions
Pin Name
Pin Number
Function
WDFN3x3-12L
1 VIN2 Power Input of Channel 2.
2 LX2 Pin for Switching of Channel 2.
3, 9 Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum
GND
power dissipation.
Exposed Pad
4 FB1 Feedback of Channel 1.
5, 11 NC1, NC2 No Connection
6 EN1 Chip Enable of Channel 1 (Active High). V V .
EN1 IN1
7 VIN1 Power Input of Channel 1.
8 LX1 Pin for Switching of Channel 1.
10 FB2 Feedback of Channel 2.
12 EN2 Chip Enable of Channel 2 (Active High). V V .
EN2 IN2
2 of 15 November 2012
PAM2306
Diodes Incorporated
www.diodes.com
Document number: DS36392 Rev. 1 - 2