Document
EUP3409
Dual 1.5MHz, 800mA Synchronous Step-Down Converter
DESCRIPTION
The EUP3409 contains two independent 1.5MHz constant frequency, current mode, PWM step-down converters. Each converter integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The EUP3409 is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. Each converter can supply 800mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The EUP3409 can also run at 100% duty cycle for low dropout applications.
FEATURES
z z z z z z z z z z z z z Up to 96% Efficiency 1.5MHz Constant Switching Frequency 800mA Load Current on Each Channel 2.5V to 5.5V Input Voltage Range Output Voltage as Low as 0.6V 100% Duty Cycle in Dropout Current Mode Operation Short Circuit Protection Thermal Fault Protection <1µA Shutdown Current Soft Start Function Space Saving 10-Pin TDFN Package RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
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Typical Application Circuit
Cellular and Smart Phones Microprocessors and DSP Core Supplies PDAs and Portable Media Players Wireless and DSL Modems Digital Still and Video Cameras
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Figure 1. Adjustable Voltage Regulator
DS3409
Ver1.0
Jan. 2008
1
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Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUP3409
Block Diagram
Figure 2.
Pin Configurations
Package Type Pin Configurations
TDFN-10
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Pin Description
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PIN EN1 FB1 IN2 GND2 SW2 EN2 FB2 IN1 GND1 SW1
Pin 1 2 3 4 5 6 7 8 9 10
DESCRIPTION Channel 1 Enable Control Input. Drive EN1 above 1.5V to turn on the Channel 1. Drive EN1 below 0.3V to turn it off (shutdown current < 0.1µA).Do not leave EN1 floating. Channel 1 Feedback. Channel 2 Supply Input. Ground 2. Channel 2 Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the Channel 2. Drive EN2 below 0.3V to turn it off (shutdown current < 0.1µA). Do not leave EN2 floating. Channel 2 Feedback. Channel 1 Supply Input. Ground 1. Channel 1 Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches.
DS3409
Ver1.0
Jan. 2008
2
N~§NãtÿmñW3^VÛmw`R•yÑb€g–PQlSø
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUP3409
Ordering Information
Order Number EUP3409JIR1 Package Type TDFN-10 Marking xxxxx P3409 20 Operating Temperature range -40 °C to 85°C
EUP3409 ¡¼
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Lead Free Code 1: Lead Free 0: Lead
Packing R: Tape & Reel Operating temperature range I: Industry Standard Package Type J: TDFN
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DS3409
Ver1.0
Jan. 2008
3
N~§NãtÿmñW3^VÛmw`R•yÑb€g–PQlSø
Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
EUP3409
Absolut.