Datasheet

UNISONIC TECHNOLOGIES CO., LTD
P2583
LINEAR INTEGRATED CIRCUIT
380KHz, 3A STEP-DOWN
SWITCHING REGULATOR
„
DESCRIPTION
The UTC P2583 is a fixed 380kHz frequency, current mode, PWM
controller with an internal power MOSFET. It achieves 3A continuous
output current over a wide input supply range with excellent load and line
regulation. Equipped with an external compensation pin, this device offers
user flexibility in determining loop dynamic.
The UTC P2583 integrates controls, monitoring and protection
functions into a single 8-pin package to provide a low cost and perfect
power solution. The device provides wide 3.6V to 28V operating input
range, also highly efficient with peak operating efficiency at 90%.
An Under- Voltage-Lock-Output (UVLO) circuit monitors the Vin supply
voltage to prevent wrong logic controls. An internal 1.222V reference
provides low output voltage down to 1.22V for further applications. The
controller’s over-current protection monitors the output current by using the
voltage drop across a current sensing resistor. Additional under voltage
protections monitor the voltage on FB pin for short-circuit protections.
The UTC P2583 provides fast transient respond and requires very few
external devices for operation.
„
FEATURES
* 3A Output Current
* Vin=3.6V,Vout=2.5V,Iload_max up to 3A
* 380kHz frequency of operation
* 3.6V to 28V Input Voltage Range
* 25μA Shutdown Supply Current
* Output Adjustable from 1.22V to 21V
* Frequency FoldBack at Short Circuit
* Thermal Shutdown
* Under Voltage Lock Output
* Current Mode with Low ESR Output Ceramic Capacitors
* Up to 90% Efficiency
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
P2583L-S08-R
P2583G-S08-R
P2583L-S08-T
P2583G-S08-T
P2583G-S08-R
„
(1)Packing Type
Package
Packing
SOP-8
SOP-8
Tape Reel
Tube
(1) R: Tape Reel, T: Tube
(2)Package Type
(2) S08: SOP-8
(3)Halogen Free
(3) G: Halogen Free, L: Lead Free
PIN CONFIGURATION
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Copyright © 2012 Unisonic Technologies Co., Ltd
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P2583
LINEAR INTEGRATED CIRCUIT
NC 1
8
SS
IN
2
7
EN
SW
3
6
COMP
GND 4
5 FB
PIN DESCRIPTION
„
PIN NO.
1
2
3
4
5
PIN NAME
NC
IN
SW
GND
FB
6
COMP
7
EN
8
SS
DESCRIPTION
NC
Power Supply pin.
Power Switch Output pin.
Ground pin.
The output voltage feedback pin. It is also the inverting input of the error amplifier.
Compensation pin. It is also the output of the internal error amplifier.
(1). A RC network at this pin compensates the control loop.
(2). The voltage at this pin controls the peak current of the internal switch.
Regulator On/Off Control pin. Leave EN unconnected if unused. A low input at EN turns
on the converter, and a high input turns it off.
Soft Start
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P2583
„
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
IN
2
EN
7
NC 1
UVLO
Reference
OTP
Current Sense
+
+
+
Slope COMP
COMP 6
1.22V
FB 5
+ EA
+
-
PMOS
PWM
LEB
-
S
Rsense
Driver
Q
R
SS 8
UVLO
UVLO
3 SW
Slope COMP
Slope COMP
4 GND
50K-380KHz
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P2583
„
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (Note 2)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
28
V
Switch Voltage
VSW
-1~ VIN+1
V
Feedback Voltage
VFB
-0.3~6
V
Enable/UVLO Voltage
VEN
-0.3~6
V
Comp Voltage
VCOMP
-0.3~6
V
Sync Voltage
VSYNC
-0.3~6
V
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65~+150
°C
Note:1. 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.
2. Exceeding these ratings may damage the device.
„
RECOMMENDED OPERATING CONDITIONS (Note 3)
PARAMETER
SYMBOL
RATINGS
Input Voltage
VIN
3.6~28
Ambient Operating Temperature
TA
-40 ~ +125
Note: 3. The device is not guaranteed to function outside its operating rating.
„
UNIT
V
°C
PACKAGE THERMAL CHARACTERISTICS (Note 4)
PARAMETER
SYMBOL
RATINGS
Junction to Ambient
θJA
105
Junction to Case
θJC
50
Note: 4. Measured on approximately 1” square of 1 oz. Copper surrounding device leads.
„
UNIT
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (Unless otherwise specified VIN=12V, TA=25°C)
PARAMETER
Feedback Voltage
Switch On Resistance
Upper Switch Leakage
Current Limit
Current Limit Gain.
Output Current to Comp Pin Voltage
Error Amplifier Transconductance
Oscillator Frequency
Short Circuit Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Enable Threshold
Enable Pull Up Current
Supply Current (quiescent)
Shutdown Current
Thermal Shutdown
SYMBOL
TEST CONDITIONS
VFB
4.75V ≤ VIN ≤ 25V, VCOMP < 2V
RSW
IO(OFF) VEN =0V, VSW =0V
ILIMIT
TYP
1.222
0.11
0
MAX
1.246
15
3.3
5.5
ΔIC =±10μA
F
F
DMAX
DMIN
VEN
IEN
ICC
ISD
T
VFB=0V
VFB =1.0V
VFB =1.5V
ICC > 100μA
VEN =0V
VEN ≥2.6V; VFB =1.4V
VEN =0V
UNISONIC TECHNOLOGIES CO., LTD
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MIN
1.198
500
342
25
800
380
50
90
A/V
1100
418
75
0
1.2
1.5
2.2
20
160
UNIT
V
Ω
µA
A
3.5
35
µA/V
KHZ
KHZ
%
%
V
µA
mA
µA
°C
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P2583
„
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
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P2583
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Efficiency(%)
„
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.
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