UNISONIC TECHNOLOGIES CO., LTD P1583

UNISONIC TECHNOLOGIES CO., LTD
P1583
Preliminary
LINEAR INTEGRATED CIRCUIT
380KHz, 2.5A STEP-DOWN
SWITCHING REGULATOR

DESCRIPTION
The UTC P1583 is a fixed 380kHz frequency, current mode, PWM
controller. It achieves 2.5A 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 P1583 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 4 to 24V 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. An
internal soft-start prevents the output voltage from overshoot as well as
limiting the input current. 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 P1583 provides fast transient respond and requires very few
external devices for operation.

FEATURES
* 2.5A output current
* 380kHz frequency of operation
* 4V to 24V input voltage range
* 25μA shutdown supply current
* Output adjustable from 1.22 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
P1583L-SH2-R
P1583G-SH2-R
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
Package
Packing
HSOP-8
Tape Reel
1 of 5
QW-R103-071.a
P1583

Preliminary
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
BS
1
IN
2
8
SS
7
EN
GND

3
6
COMP
GND
4
5
FB
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8

SW
PIN NAME
BS
IN
SW
GND
FB
COMP
EN
SS
DESCRIPTION
Supply pin to the power transistor driver.
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.
Regulator On/Off control pin.
Soft start control input.
BLOCK DIAGRAM
IN
2
EN
7
UVLO
Reference
OTP
Current Sense
+
+
+
Slope COMP
COMP 6
1.22V
FB 5
+ EA
Rsense
1 BS
PWM
+
-
-
S
Power
Transistor
Q
R
Driver
3 SW
SS 8
UVLO
UVLO
Slope COMP
Slope COMP
4 GND
40K-380KHz
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 5
QW-R103-071.a
P1583

Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (Note 1)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
28
V
Switch Voltage
VSW
-1~VIN+1
V
Boost Voltage
VBS
VSW+6
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
Lead Temperature
TL
260
°C
Storage Temperature
TSTG
-65~+150
°C
Notes:
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.

RECOMMENDED OPERATING CONDITIONS (Note 1)
PARAMETER
SYMBOL
RATINGS
Input Voltage
VIN
4~24
Ambient Operating Temperature
TA
-40~+125
Note: 1. The device is not guaranteed to function outside its operating rating.

UNIT
V
°C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
PARAMETER
SYMBOL
RATINGS
Thermal Resistance
θJA
105
Thermal Resistance
θJC
50
Note: 1. 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
SYMBOL
Feedback Voltage
VFB
Upper Switch Leakage
Current Limit
Current Limit Gain.
Output Current to Comp Pin Voltage
Oscillator Frequency
Short Circuit Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Enable Threshold
Enable Pull Up Current
Under Voltage Lockout Threshold Rising
Supply Current (Shutdown)
Supply Current (Quiescent)
Collector-Emitter Saturation Voltage
Thermal Shutdown
ILEAK
ILIMIT
MIN
TYP
MAX
UNIT
1.198
1.222
1.246
V
2.4
0
3.0
10
3.6
µA
A
2.5
FOSC
FOSC_SHORT
DMAX
DMIN
VEN
IUP
ISD
IQ
VCESAT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TEST CONDITIONS
4.75V≤VIN≤25V,
VCOMP<2V
VEN=0V, VSW =0V
VFB=0V
VFB=1.0V
VFB=1.5V
ICC>100μA
VEN=0V
VEN≤0.4V
VEN≥2.6V; VFB=1.4V
IOUT=2A
342
20
90
380
40
95
1.0
0.7
1.2
23
1.5
400
160
A/V
418
0
1.3
36
2
600
KHZ
KHZ
%
%
V
µA
V
µA
mA
mV
°C
3 of 5
QW-R103-071.a
P1583
Preliminary

TYPICAL APPLICATION CIRCUIT

LOW VIN APPLICATION CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
LINEAR INTEGRATED CIRCUIT
4 of 5
QW-R103-071.a
P1583
Preliminary
LINEAR INTEGRATED CIRCUIT
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
5 of 5
QW-R103-071.a