EP3003
2-CH, 600mA Synchronous Step-down Converter
DESCRIPTION
The EP3003 is a dual channel, 1.5MHz constant
frequency, slope compensated current mode PWM
step-down converter. The EP3003 can supply
600mA of load current from a 2.5V to 5.5V input
voltage. Each output voltage is adjustable from
0.6V to 5V. It is ideal for powering portable
equipment that runs from a single cell lithium-Ion
(Li+) battery. Internal synchronous 0.35Ω, 1A
power switches provide high efficiency without the
need for external Schottky diodes. The EP3003
can also run at 100% duty cycle for low dropout
operation, extending battery life in portable
system. Pulse Skipping Mode operation at light
loads provides very low output ripple voltage for
noise sensitive applications. Burst Mode operation
provides higher efficiency at light loads.
FEATURES
‧
High Efficiency: Up to 96%
‧
1.5MHz Constant Switching Frequency
‧
600mA Output Current
‧
Integrated Main Switch and Synchronous
Rectifier
‧
High Switch Current: 1A on Each Channel
‧
2.5V to 5.5V Input Voltage Range
‧
Output Voltage as Low as 0.6V
‧
100% Duty Cycle in Dropout
‧
Low Quiescent Current: 50μA
‧
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
‧
Can be synchronized to an external oscillator
‧
Short Circuit Protection
‧
Power-on Reset Output
‧
Thermal Fault Protection
‧
<1uA Shutdown Current
‧
Small Thermally Enhanced 10-Pin MSOP and
3mm × 3mm DFN Packages
APPLICATIONS
‧
Cellular and Smart Phones
‧
Microprocessors and DSP Core Supplies
‧
Wireless and DSL Modems
‧
PDAs
‧
Portable Instruments / Media Players
‧
Digital Cameras
‧
PC Cards
Typical Application
Figure 1. Basic Application Circuit for 2.5V and 1.8V Output Voltages
Rev.01
1
EP3003
Package/Order Information
MSOP:
DFN:
Eorex
Power Management
Buck Regulator
Series Number
E
P
30
03
Absolute Maximum Rating
(Note1)
Input Supply Voltage........ ...................... -0.3V to +6V
RUN, V
FB
Voltages ................. ..... -0.3V to VIN+0.3V
SW Voltages............................…....-0.3V to VIN+0.3V
MODE/SYNC Voltages....................-0.3V to VIN+0.3V
/POR Voltages..................... ....…... ...... -0.3V to +6V
P-Channel Switch Source Current (DC).….......800mA
N-Channel Switch Sink Current (DC).....……....800mA
Operating Temperature Range............ -40°C to +85°C
Junction Temperature……….............................+125°C
Storage Temperature Range (MSOP) -65°C to +150°C
Storage Temperature Range (DFN) .. -65°C to +125°C
Lead Temperature (Soldering, 10s) ............…..+300°C
Note 1. Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Rev.01
2
EP3003
Electrical Characteristics
(Note 2)
:
(V
IN
=V
RUN
= 3.6V, T
A
= 25°C, unless otherwise noted.)
Parameter
Input Voltage Range
Input DC Supply Current
Active Mode
Shutdown Mode
Regulated Feedback
Voltage
V
FB
=0.5V
RUN=0V, V
IN
=5.5V, MODE/SYNC=0V
T
A
= +25°C
T
A
= 0°C
≦
T
A
≦
85°C
T
A
= -40°C
≦
T
A
≦
85°C
V
FB
Input Bias Current
Reference Voltage
Line Regulation
Power-On Reset
(POR)
Threshold:
V
FBX
Ramping Up, MODE/SYNC = 0V
V
FBX
Ramping Down, MODE/SYNC =
0V
Power-On Reset On-Resistance
Power-On Reset Delay
Output
Voltage
Load
100
270K
0.5
200
Ω
Cycles
%
8.5
-8.5
%
%
V
IN
= 2.5V to 5.5V
0.3
0.588
0.586
0.582
600
0.1
0.600
0.600
0.600
800
1.0
0.612
0.613
0.618
30
0.5
µA
µA
V
V
V
nA
%/V
Conditions
MIN
2.5
TYP
MAX
5.5
unit
V
Regulation
Peak Inductor Current
V
IN
=3V, V
FB
=0.5V
Duty Cycle < 35%
Oscillator Frequency
Synchronization
Frequency
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
SW Leakage
V
RUN
= 0V, V
FBX
= 0V,
V
IN
= 5V
RUN Threshold
RUN Leakage Current
-40°C
≦
T
A
≦
85°C
0.3
1.0
±0.01
1.50
±1
V
µA
0.35
0.30
0.01
0.45
0.45
1
Ω
Ω
µA
V
FBX
=0.6V
1.2
1.5
1.5
1.8
MHz
MHz
0.75
1.00
1.25
A
Note 2. 100% production test at +25°C. Specifications over the temperature range are guaranteed by design
and characterization.
Rev.01
3
Embedded System
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