Datasheet

UNISONIC TECHNOLOGIES CO., LTD
P1580
Preliminary
LINEAR INTEGRATED CIRCUIT
380KHz, 2.5A STEP-DOWN
SWITCHING REGULATOR
„
DESCRIPTION
The UTC P1580 is a current mode, PWM controller with 380kHz
fixed frequency. It achieves 2.5A continuous output current over a
wide input supply range with excellent load and line regulation. By
using an external compensation pin, this device offers user flexibility
in determining loop dynamic.
The UTC P1580 integrates control, monitor and protection
functions to provide a low cost and perfect power solution. The
device provides 3.5 to 28V wide range operating input and
high-efficiency up to 90%.
An Under- Voltage-Lock-Output (UVLO) circuit monitors the
supply voltage to prevent from wrong logic control. An internal
1.222V reference voltage provides low output voltage down to 1.22V
for further applications. The over-current protection of controller
monitors the output current by using the voltage drop across a
current sensing resistor. Additional under voltage protection monitors
the voltage on FB pin for short-circuits protection.
The UTC P1580 provides fast transient response and requires
very few external devices for operation.
„
FEATURES
* 2.5A Output Current
* 380kHz Frequency of Operation
* 3.5V to 28V Input Voltage Range
* 5μA Shutdown Supply Current
* Output Adjustable From 1.22 to 21
* Frequency Feedback at Short Circuit
* Thermal Shutdown
* Under Voltage Lock Output
* Current Mode With Low ESR Output Ceramic Capacitors
* Up to 90% Efficiency
* Frequency Synchronization Input
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
P1580L-SH2-R
P1580G-SH2-R
P1580L-SH2-T
P1580G-SH2-T
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Copyright © 2010 Unisonic Technologies Co., Ltd
Package
Packing
HSOP-8
HSOP-8
Tape Reel
Tube
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QW-R103-049.A
P1580
Preliminary
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
„
BS 1
IN 2
8 SYNC
GND
SW 3
GND 4
7 EN
6 COMP
5 FB
PIN DESCRIPTION
„
PIN NO.
PIN NAME
1
BS
2
3
4
5
IN
SW
GND
FB
6
COMP
7
EN
8
SYNC
DESCRIPTION
Supply pin to the power transistor driver. Tie to external circuit to generate a local supply
voltage higher than the input voltage in order to fully turn on the internal power transistor.
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.
Synchronization Input - The sync pin is used to synchronize the internal oscillator to an
external signal.
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P1580
„
Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
EN
7
UVLO
Reference
1.22V
FB
5
+ EA
-
IN
2
OTP
Rsense
PWM
+
+
-
-
S
Q
R
Power
Transistor
Driver
UVLO
COMP 6
4
Slope COMP
SYNC
8
3 SW
GND
45K-380KHz
1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
BS
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Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (Note 3)
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
Compensation Voltage
VCOMP
-0.3~6
V
Synchronization Voltage
VSYNC
-0.3~6
V
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65~+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.
„
RECOMMENDED OPERATING CONDITIONS (Note 1)
PARAMETER
SYMBOL
Input Voltage
VIN
Ambient Operating Temperature
TA
Note: The device is not guaranteed to function outside its operating rating.
RATINGS
3.5~28
-40 ~ +125
UNIT
V
°C
PARAMETER
SYMBOL
RATINGS
Junction to Ambient
θJA
105
Junction to Case
θJC
50
Note: Measured on approximately 1” square of 1 oz. Copper surrounding device leads.
UNIT
°C/W
°C/W
„
„
THERMAL DATA (Note 1)
ELECTRICAL CHARACTERISTICS (VIN=12V, TA=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
Feedback Voltage
VFB
7V ≤ VIN ≤ 25V, VCOMP < 2V
1.198
Upper Switch Leakage
VEN =0V, VSW =0V
Current Limit
ILIMIT
3.1
Current Limit Gain.
GCOMP
Output Current to Comp Pin Voltage
Error Amplifier Voltage Gain
AVEA
Error Amplifier Transconductance
GEA
ΔIC =±10μA
680
Oscillator Frequency
FOSC
342
Short Circuit Frequency
FSC
VFB=0V
40
Synchronization Frequency
FSYNC Sync Drive 0 ~ 2.7V
370
VFB =1.0V
Maximum
DMAX
Duty Cycle
Minimum
DMIN
VFB =1.5V
Switch VCESAT
ISW =2A
Enable Threshold
VEN
ICC > 100μA
0.9
Enable Pull Up Current
IEN
VEN =0V
VEN ≤0.4V
Shutdown
ISHDN
Supply Current
Quiescent
IQ
VEN ≥2.6V; VFB =1.4V
Current of Short Circuit
ISC
VIN=10V
Thermal Shutdown
TOTP
Note: If the VIN voltage exceeding 23V under short circuit condition, there will be some risk.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TYP
1.222
0.1
3.3
MAX
1.246
10
3.3
UNIT
V
µA
A
2.2
A/V
400
770
380
46
V/V
µA/V
KHZ
KHZ
KHZ
%
%
mV
V
µA
µA
mA
A
°C
1000
418
54
660
90
0
400
1.1
0.1
5
1.7
1.8
160
1.3
8
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Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
If the load current is applied in 2A, the input voltage can range from 7 to 28V.
If the load current is applied in 2A, the input voltage can range from 4.4 to 28V.
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www.unisonic.com.tw
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P1580
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Efficiency (%)
Efficiency (%)
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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