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Features
• High Efficiency: Up to 96%
• 1.5MHz Constant Switching Frequency
• 600mA Output Current at V
IN
= 3V
• Integrated Main Switch and Synchronous
Rectifier
• No Schottky Diode Required
• 2.5V to 5.5V Input Voltage Range
• Output Voltage as Low as 0.6V
• 100% Duty Cycle in Low Dropout Operation
• Low Quiescent Current: 300µA
• Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
• Short Circuit Protection
• Thermal Fault Protection, <1uA Shutdown
Current
• Space Saving 5-Pin Thin SOT23 package
EP3001
1.5MHz, 600mA Synchronous Step-down Converter
Description
The EP3001 is a 1.5MHz, constant frequency,
slope compensated current mode PWM
step-down converter. The device integrates a
main switch and a synchronous rectifier for high
efficiency without an external Schottky diode. It is
ideal for powering portable equipment that runs
from a single cell lithium-Ion (Li+) battery.
The EP3001 can supply 600mA of load current
from a 2.5V to 5.5V input voltage. The output
voltage can be regulated as low as 0.6V. The
EP3001 can also run at 100% duty cycle for low
dropout operation, extending battery life in
portable system. Idle mode operation at light
loads provides very low output ripple voltage for
noise sensitive applications.
The EP3001is offered in a low profile (1mm) 5-pin,
thin SOT package, and is available in an
adjustable version and fixed output voltage of
1.2V, 1.5V and 1.8V.
Applications
• Cellular and Smart Phones
• Microprocessors and DSP Core Supplies
• Wireless and DSL Modems
• PDAs
• MP3 Players
• Digital Still and Video Cameras
• Portable Instruments
Typical Application
Efficiency vs Output Current
100.00%
L1
3 2.2μH
90.00%
V
OUT
1.2V
C1
10μF
V
IN
C1
4.7μF
4
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
0.1
1
10
100
1000
V
IN
SW
EP3001
1
EN
GND
2
V
OUT
5
Figure 1-Basic application circuit with EP3001 fixed output version
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Pin Assignment
Adjustable Output Version
Top View
EN
GND
SW
1
2
3
4
V
IN
5
FB
EN
GND
SW
1
2
3
Top View
EP3001
Fixed Output Version
5
V
OUT
4
V
IN
TSOT23-5
TSOT23-5
* Fixed 1.5V Marking A2YW
* Fixed 1.8V Marking A3YW
* Fixed 1.2V Marking A4YW
Ordering Information
Pin Description
Pin
1
Name
EN
Function
Regulator Enable control input. Drive EN above 1.5V to turn on the part.
Drive EN below 0.3V to turn it off. In shutdown, all functions are disabled
drawing <1µA supply current. Do not leave EN floating.
Ground
Power Switch Output. It is the Switch note connection to Inductor. This pin
connects to the drains of the internal P-Ch and N-Ch MOSFET switches.
Supply Input Pin. Must be closely decoupled to GND, Pin 2, with a 2.2µF or
greater ceramic capacitor.
FB(EP3001-Adj):
Feedback Input Pin. Connect FB to the center point of the external resistor
divider. The feedback threshold voltage is 0.6V.
V
OUT
(EP3001-1.2/EP3001-1.5/EP3001-1.8):
Output Voltage Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal reference voltage.
2
3
4
5
GND
SW
V
IN
FB/V
OUT
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Thermal Resistance
(Note 1)
Package
TSOT23-5
θ
JA
220°C/W
θ
JC
EP3001
110°C/W
Absolute Maximum Rating
(Note 2)
Symbol
V
IN
V
EN,FB
V
SW
EN, FB Voltages
SW Voltages
P-Channel Switch Source Current(DC)
N-Channel Switch Sink Current(DC)
Peak SW Sink and Source Current
T
OP
T
J
T
STG
T
L
Operating Temperature Range
Junction Temperature
(Note 3)
Item
Input Supply Voltage
Rating
-0.3 ~ +6
-0.3 ~ V
IN
-0.3 ~ V
IN
+0.3
800
800
1.3
-40 ~+85
+125
-65 ~ +150
+300
Units
V
V
V
mA
mA
A
°C
°C
°C
°C
Storage Temperature Range
Lead Temperature (Soldering, 10s)
Note 1:Thermal
Resistance is specified with approximately 1 square of 1 oz copper.
Note 2:Absolute
Maximum Ratings are those values beyond which the life of a device may be
impaired.
Note 3:T
J
is calculated from the ambient temperature T
A
and power dissipation PD according to the
following formula: T
J
= T
A
+ (PD)
×
(220°C/W)
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Electrical Characteristics
(Note 4)
(V
IN
=V
EN
=3.6V, T
A
=25, unless otherwise noted.)
Symbol
V
IN
I
S
V
FB
∆V
FB
I
FB
Parameter
Input Voltage Range
Input DC Supply Current Active
Mode Shutdown Mode
Regulated Feedback Voltage
Reference Voltage Line Regulation
Feedback Input Bias Current
Conditions
V
FB
=0.5V or V
OUT
=90%
V
FB
=0V, V
IN
=4.2V
T
A
=+25°C
T
A
=0°C≤T
A
≤85°C
T
A
=-40°C≤T
A
≤85°C
V
IN
=2.5V to 5.5V
V
FB
=0.65V
EP3001-1.2,
-40°C≤T
A
≤
85°C
EP3001-1.5,
-40°C≤T
A
≤
85°C
EP3001-1.8,
-40°C≤T
A
≤
85°C
V
IN
=2.5V to 5.5V
V
IN
=3V, V
FB
=0.5V or
V
OUT
=90% Duty Cycle
< 35%
V
FB
=0.6V or
V
OUT
=100%
I
SW
=300mA
I
SW
=-300mA
V
EN
=0V, V
SW
=0V or 5V,
V
IN
=5V
-40°C≤T
A
≤
85°C
Min.
2.5
Typ.
EP3001
Max.
5.5
400
1.0
0.6120
0.6135
0.6180
0.4
±30
Units
V
µA
µA
V
V
V
%/V
nA
V
V
V
%
%
0.5880
0.5865
0.5820
300
0.1
0.6000
0.6000
0.6000
0.04
1.164
1.455
1.746
1.200
1.500
1.800
0.04
0.5
1.236
1.546
1.854
0.40
V
OUT
Regulated Output Voltage
∆
V
OUT
V
LOADREG
I
PK
f
OSC
R
PFET
R
NFET
I
LSW
V
EN
I
EN
Output Voltage Line Regulation
Output Voltage Load Regulation
Peak Inductor Current
Oscillator Frequency
R
DS(ON)
of P-CH MOSFET
R
DS(ON)
of N-CH MOSFET
SW Leakage
EN Threshold
EN Leakage Current
0.75
1.2
1.00
1.5
0.40
0.35
±0.01
1.25
1.8
0.50
0.45
±1
1.30
±1
A
MHz
Ω
Ω
µA
V
µA
0.3
1.0
±0.01
Note 4:100%
production test at +25°C. Specifications over the temperature range are guaranteed by
design and characterization.
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Typical Performance Characteristics
(Test circuitry is as Figure 2, unless otherwise specified.)
Dynamic Supply Current vs Supply Voltage
400
380
360
340
320
300
280
260
240
220
200
2
3
4
5
6
1.210
1.208
1.206
1.204
1.202
1.200
1.198
1.196
1.194
1.192
1.190
2
3
4
EP3001
Output Voltage vs Supply Voltage
5
6
Efficiency vs Output Current
100.00%
90.00%
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
0.1
100.00%
90.00%
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
0.1
Efficiency vs Output Current
1
10
100
1000
1
10
100
1000
Efficiency vs Output Current
100.00%
90.00%
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
0.1
100.00%
90.00%
80.00%
70.00%
60.00%
50.00%
40.00%
30.00%
20.00%
10.00%
0.00%
Efficiency vs Output Current
1
10
100
1000
1
10
100
1000
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