Datasheet

UNISONIC TECHNOLOGIES CO., LTD
P1986
LINEAR INTEGRATED CIRCUIT
PWM CONTROL 3A
STEP-DOWN CONVERTER
„
DESCRIPTION
The UTC P1986 consists of 3A step-down switching
regulator with PWM control which includes a reference voltage
source, oscillation circuit, error amplifier, internal PMOS and etc.
The UTC P1986 can provide low-ripple power, high
efficiency, and perfect transient characteristics. The duty ratio
varies linearly from 0% to 100% in the PWM control. The error
amplifier circuit and soft-start circuit included in this device can
prevent overshoot at startup. Internally, the build-in compensation
block can reduce external component count. An enable function,
an over current protect (OCP) function and short circuit protect
(SCP) are also build inside, and when OCP happens, the
operation frequency will be reduced.
In application, the UTC P1986 is suitable for portable devices
when it works as an ideal power supply in SOP-8L package.
There is an internal P-channel power MOS, a coil, capacitors
inside and a diode connected externally that makes these ICs
step-down switching regulators.
„
FEATURES
* Input voltage varies from 3.6V to 28V
* Output voltage varies from 0.8V to VCC
* Duty ratio varies from 0% to 100% PWM control
* With 330kHz typical oscillation frequency
* Thermal shutdown and SCP function and soft-start, current limit,
enable function
* Low ESR output capacitor(Multi-layer chip capacitor) application
* Built-in switch P-channel power MOS
* Halogen Free
„
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
P1986L-S08-R
P1986G-S08-R
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
Package
Packing
SOP-8
Tape Reel
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QW-R103-046.C
P1986
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LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
FB
1
8
VSS
EN
2
7
VSS
COMP
3
6
SW
VCC
4
5
SW
PIN DESCRIPTION
PIN NO.
1
PIN NAME
FB
2
EN
3
4
5
6
7
8
COMP
VCC
SW
SW
VSS
VSS
DESCRIPTION
Feedback pin
Power-off pin
H: normal operation (Step-down)
L: Step-down operation stopped (All circuits deactivated)
Compensation pin
IC power supply pin
Switch pin. Connect external inductor/diode here.
Switch pin. Connect external inductor/diode here.
GND pin
GND pin
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QW-R103-046.C
P1986
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LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
EN
VCC
COMP
Reference
Voltage
Current
Limit
EN
FB
SS
PWM
Lateh
Driver
SW
VREF
OSC
VSS
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (Ta=25°C, unless otherwise specified )
PARAMETER
SYMBOL
RATINGS
UNIT
VCC Pin Voltage
VCC
VSS -0.3 ~VSS +30
V
Feedback Pin Voltage
VFB
VSS -0.3 ~ VCC
V
ON/OFF Pin Voltage
VEN
VSS - 0.3 ~ VCC+ 0.3
V
Switch Pin Voltage
VSW
VSS - 0.3 ~ VCC+ 0.3
V
Operating Supply Voltage
VOP
+3.6 ~ 28
V
Power Dissipation
PD
Internally limited
mW
Storage Temperature
TSTG
-40 ~ +150
°C
Operating Temperature
TOPR
-20 ~ +125
°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
Soft-Start Time
Internal MOSFET RDS(ON)
EN Pin Logic input threshold voltage
Thermal shutdown Temp
SYMBOL
VFB
IFB(BIAS)
IQ
fOSC
TEST CONDITIONS
IOUT=0.2A
IOUT=0.1A
Pear current, No outside circuit
VFB=0V Force driver on
VEN=0V No outside circuit VFB=0V
Force driver on
VFB=1.2V Force driver off
Measure waveform at SW Pin
fOSC1
Measure waveform at SW Pin
ISW
ISTN-BY
ΔVOUT
VOUT
ΔVOUT
VOUT
ISH
ISL
TSS
RDS(ON)
VSH
VSL
TSD
4
260
A
2
10
μA
3
330
5
400
mA
KHz
40
KHz
VCC=5V-28V, IOUT=0.2A
0.4
%
IOUT=0.2A-3A
0.3
%
VEN=2.5V(ON)
VEN=0.3V(OFF)
5
0
3.5
130
80
μA
μA
ms
mΩ
mΩ
V
V
°C
0.3
VCC=5V,VFB=0V
VCC=12V,VFB=0V
High(regulator ON)
Low(regulator OFF)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN TYP MAX UNIT
0.784 0.80 0.816
V
0.1
0.5
μA
8
150
100
1.6
0.8
140
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LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
MLCC
VCC (V)
7
12
19
C1 (nF)
1
1
1
C4 (μF)
33
33
33
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
C7 (nF)
2.2
2.2
10
C8 (μF)
0.1
0.1
0.1
R3 (KΩ)
10.3
10.96
5.94
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LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
VCC=19V, VOUT=0V
200
0
-200
VCC=19V, VOUT=5V, IOUT=3A
20
SW
20
SW
Output Voltage (mV)
„
0
0
0
10
20
Time (2μs/div)
0
50
100
Time (10μs/div)
Efficiency vs. Load Current
100
VCC =7V
Efficiency (%)
90
80
VCC =12V
70
60
VCC =19V
50
VOUT =5V
40
0
0.5
2.0
1.0
1.5
Load Current, ILOAD (A)
2.5
3.0
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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