Datasheet

UNISONIC TECHNOLOGIES CO., LTD
P3586
LINEAR INTEGRATED CIRCUIT
PWM CONTROL 3A STEP-DOWN
CONVERTER

DESCRIPTION
The UTC P3586 is a fixed 1.2MHz frequency, voltage mode, PWM
controller with an internal power MOSFET. It supplies 3A continuous
output current over a wide input supply range with excellent load and line
regulation.
An internal reference voltage source provides low output voltage down
to 0.8V for further applications. A PWM control circuit can provide 0~100%
duty ratio.
The reliability of UTC P3586 achieved by such protection circuits. An UVLO (Under voltage lock output) circuit
monitors the VCC supply voltage to prevent wrong logic controls. The controller’s OCP (Over current protection)
circuit monitors the output current by using the voltage drop across the power MOSFET’s RDS saving the use of a
current sensing resistor. Over current protection circuit also monitors the voltage on FB pin under short-circuit
conditions.
The UTC P3586 is generally applied in portable devices. For maximum flexibility in determining loop dynamic,
this device is equipped with compensation pin. In addition, it is requiring less external components for operation due
to its configuration.

FEATURES
* 3A Output Current
* 1.2MHz Frequency
* Input Voltage Range: 3.6V to 23V
* 10μA Shutdown Supply Current
* Output Voltage Varies from 0.8V to VCC
* Frequency fold back at Short Circuit
* Protection Circuits:
UVLO, Thermal Shutdown, OCP
*Low ESR Output Capacitor (Multi-Layer Chip Capacitor (MLCC)) Application.

ORDERING INFORMATION
Ordering Number
Lead Free
P3586L-S08-T
P3586L-S08-R
Halogen Free
P3586G-S08-T
P3586G-S08-R
Package
Packing
SOP-8
SOP-8
Tube
Tape Reel
P3586L-S08-T
(1)Packing Type
(1) T: Tube, R: Tape Reel
(2)Package Type
(2) S08: SOP-8
(3)Halogen Free
(3) L: Lead Free, G: Halogen Free
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Copyright © 2013 Unisonic Technologies Co., Ltd
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P3586
LINEAR INTEGRATED CIRCUIT

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
PIN NAME
1
FB
2
EN
3
COMP
4
5, 6
7, 8
VCC
SW
VSS

DESCRIPTION
Feedback pin-An external resistor divider from the output to GND, tapped to the FB pin
sets the output voltage.
Regulator On/Off Control pin. A high input at EN turns on the converter, and a low input
turns it off.
Compensation pin- This node is the output of the error amplifier and the input to PWM
comparator.
Input Supply Pin.
Power Switch Output pin
GND pin
BLOCK DIAGRAM
EN
2
Reference
Voltage Source
and Bias Current
Source
UVLO
FB
1
Current Limit
EA
+
R
+
-
-
Q
PMOS
Driver
PWM
OTP
3
5,6
7,8
1.2MHz
Oscillator
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
VCC
+
S
+
-
COMP
Short Circuit Signal
OCP
Soft
Start
0.8V
4
SW
VSS
Short Circuit Signal
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P3586

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified )
PARAMETER
SYMBOL
RATINGS
UNIT
VCC Pin Voltage
VCC
-0.3 ~+23
V
Feedback Pin Voltage
VFB
-0.3 ~ +6
V
ON/OFF Pin Voltage
VEN
- 0.3 ~ VCC +0.3
V
Switch Pin Voltage
VSW
- 0.3 ~ VCC+ 0.3
V
Operating Supply Voltage
VOP
+3.6 ~ +20
V
Power Dissipation
PD
Internally limited
mW
Operating Junction Temperature
TJ
-20 ~ +125
°C
Storage Temperature
TSTG
-40 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA
PARAMETER
SYMBOL
RATINGS
UNIT
Junction to Ambient
θJA
70
°С/W
Junction to Case
θJC
25
°С/W
Notes: θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1 in2(Multi-layer)

ELECTRICAL CHARACTERISTICS (VIN = 12V, Ta= 25°C, unless otherwise specified.)
PARAMETER
Feedback Voltage
Feedback Bias Current
Switch Current
Standby Current
Quiescent Current
Oscillation Frequency
Frequency of Current Limit or Short
Circuit Protect
Line Regulation
Load Regulation
EN Pin Input Current
Internal MOSFET RDS(ON)
EN Pin Logic input threshold voltage
Thermal Shutdown Temp
Efficiency
Soft Start Time
SYMBOL
VFB
IFB(BIAS)
IQ
fOSC
TEST CONDITIONS
MIN
IOUT=0.1A
0.784
IOUT=0.1A
Pear current, No outside circuit
3.2
VFB=0.7V Force driver on
VEN=0V No outside circuit VFB=0V
Force driver on
VFB=1.2V Force driver off
Measure waveform at SW Pin
1.0
fOSC1
Measure waveform at SW Pin
ISW
ISTN-BY
∆VOUT
VOUT
∆VOUT
VOUT
ISH
ISL
RDS(ON)
VSH
VSL
TSD
EFFI.
TSS
MAX
0.816
0.5
4.5
UNIT
V
μA
A
10
μA
3
1.2
5
1.4
mA
MHz
90
120
KHz
VCC=5V-20V, IOUT=0.2A
1
2
%
IOUT=0.2A-3A
0.2
0.5
%
0
110
70
30
1
150
100
μA
μA
mΩ
mΩ
V
V
°C
%
mS
VEN=2.5V(ON)
VEN=0.3V(OFF)
VCC=5V,VFB=0V
VCC=12V,VFB=0V
High(regulator ON)
Low(regulator OFF)
70
2.0
0.8
VIN = 12V, VOUT = 5V, IOUT = 3A
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP
0.80
0.1
0.3
160
88
2
5
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
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
VCC+12V
1
ON/OFF
C2
22uF
(MLCC)
C3
0.22µF
(option)
2
R4
100K
C6
0.1µF
(option) R3
15K
C7
10nF
UTC P3586
FB
Vss
EN
Vss
8
7
6
3 COMP
SW
4 Vcc
SW 5
C8
51pF
1
L1
10µH
D1
D1N5822
VOUT=5V/3A
2
R1
6.8K
R2
1.3K
C1
0.33nF
C4
22µF
(MLCC)
 R1  R 2 
Notes: V

OUT  VFB  
 R2 
(C2 can choose 220uF Low ESR AL Cap Or 22uF MLCC Cap)
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www.unisonic.com.tw
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LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Output Voltage
(mV)
SW
SW

UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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