Datasheet

UNISONIC TECHNOLOGIES CO., LTD
P1886
LINEAR INTEGRATED CIRCUIT
PWM CONTROL 3A
STEP-DOWN CONVERTER

DESCRIPTION
UTC P1886 consists of 3A step-down switching regulator
control which includes a reference voltage source, oscillation
circuit, error amplifier, internal PMOS and etc with PWM.
UTC P1886 can provide low-ripple power, high efficiency, and
excellent transient characteristics and an enable function, an over
current protect function and a short circuit protect function are built
inside, so the operation frequency will be reduced from 300KHz to
30KHz when OCP or SCP happens. And the PWM control circuit
can vary the duty ratio linearly from 100 down to 0%. This
converter also includes an error amplifier circuit as well as a
soft-start circuit that prevents overshoot at startup. Also, to
minimum external component count an internal compensation
block is built in.
UTC P1886 can work as step-down switching regulators with
the addition of an internal P-channel Power MOS, a coil,
capacitors, and a diode connected externally. It provides such
outstanding features: low current consumption. It is also suitable
for the operation via an AC adapter because this converter can
accommodate an input voltage up to 23V.

FEATURES
* Soft-start, Current Limit, Enable function
* Thermal Shutdown function
* Built-in internal SW P-channel MOS
* Input voltage: 4V to 23V.
* Output voltage: 0.8V to VCC.
* Duty ratio: 0% to 100% PWM control
* Oscillation frequency: 300KHz typ.

ORDERING INFORMATION
Ordering Number
P1886G-S08-R
P1886G-SH2-R
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOP-8
HSOP-8
Packing
Tape Reel
Tape Reel
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QW-R103-042.D
P1886
LINEAR INTEGRATED CIRCUIT

MARKING

PIN CONNECTIONS


NC
1
8
NC
VCC
2
7
EN
Output
3
6
NC
VSS
4
5
FB
PIN DESCRIPTIONS
PIN NO
2
NAME
VCC
3
Output
4
5
VSS
FB
7
EN
DESCRIPTION
IC power supply pin
Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to
reduce EMI.
GND
Feedback pin.
Power-off pin H: Normal operation (Step-down operation) L: Step-down operation
stopped (All circuits deactivated)
BLOCK DIAGRAM
Output
Oscillation Circuit
Reference Voltage Source with Soft Start
+
PWM-Switched Control Circuit
-
Thermal Shutdown
VCC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
FB
VEN
Vss
EN
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P1886

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATING
UNIT
VCC Pin Voltage
VCC
VSS-0.3 ~ VSS+25
V
Feedback Pin Voltage
VFB
VSS-0.3 ~ VCC
V
EN Pin Voltage
VEN
VSS-0.3 ~ VIN+0.3
V
Switch Pin Voltage
VOUTPUT
VSS-0.3 ~ VIN+0.3
V
Power Dissipation
PD
Internally limited
mW
Operating Ambient Temperature
Ta
-20 ~ +85
°C
Operating Temperature
TOPR
-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
Junction to Ambient

SYMBOL
θJA
MIN
TYP
MAX
134
UNIT
°C/W
ELECTRICAL CHARACTERISTICS (Ta=25°C, VIN=12V, unless otherwise specified)
PARAMETER
Input Voltage
Feedback Voltage
Feedback Bias Current
Switch Current
Standby Current
Line Regulation
Load Regulation
Oscillation Frequency
Frequency of Current Limit or
Short Circuit Protect
EN Pin Input Voltage
EN Pin Input Leakage Current
Soft-Start Time
Internal MOSFET RDS(ON)
Efficiency
SYMBOL
VIN
VFB
IFB(BIAS)
ISW
ISTN-BY
∆VOUT
VOUT
∆VOUT
VOUT
fOSC
CONDITIONS
IOUT=0.1A
IOUT=0.1A
VEN=0V
VIN=5V~23V, IOUT=0.2A
IOUT=0.1~3A
Measure waveform at SW pin
240
fOSC1
Measure waveform at SW pin
10
VSH
VSL
ISH
ISL
TSS
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW pin
RDS(ON)
η
0.3
VIN=5V, VFB=0V
VIN=12V, VFB=0V
VIN=12V, VOUT=5V, IOUT=3A
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN. TYP. MAX. UNIT
4
23
V
0.784 0.8 0.816
V
0.1
0.5
µA
3.5
A
10
µA
1
2
%
0.2
0.5
%
300
360
KHz
KHz
0.79
0.72
20
-10
2
110
70
88
5
150
100
V
V
µA
µA
ms
mΩ
mΩ
%
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
LINEAR INTEGRATED CIRCUIT
FUNCTION DESCRIPTION
PWM Control
The UTC P1886 consists of DC/DC converters which employ a PWM system. In this DC/DC converter, the
pulse width varies in a range from 0 to 100% which is according to the load current. Cause the switching frequency
remains constant the ripple voltage which produced by the switching can be removed easily through a filter.
Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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P1886
LINEAR INTEGRATED CIRCUIT

TYPICAL APPLICATION CIRCUIT
+
TEST CIRCUITS
-

VIN=12V, IMAX=3A
VOUT
L1 Value
2.5V
15µH
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3.3V
18µH
5V
22µH
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LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS

Input Voltage vs. Frequency
VOUT=5V
IOUT=0.2A
315
VOUT=5V
IOUT=0.2A
0.83
310
305
300
295
290
285
280
275
270
Input Voltage vs. Feedback Voltage
0.84
Feedback Voltage, FB (V)
Oscillation frequency,Fosc (KHz)
320
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
5
0
20
15
Input Voltage,VIN (V)
10
0.74
25
0
5
Line Regulation
5.00
4.98
Output Voltage,VOUT (V)
Output Voltage,VOUT (V)
25
Load Regulation
4.99
VOUT=5V
IOUT=0.2A
4.95
10
15
20
Input Voltage,VIN (V)
4.90
4.85
4.80
4.75
VIN=12V
4.97
4.96
4.95
4.94
4.93
4.92
4.91
4.90
4.70
0
5
10
15
20
25
Input Voltage,VIN (V)
4.89
0.0
0.5
1.0
2.0
1.5
2.5
Ouput Current,IOUT (A)
3.0
Output Current vs. Efficiency
100
VOUT=5.0V
90
Efficiency (%)
80
VOUT=3.3V
70
60
50
40
30
20
10
0
0.0
0.5
2.0
2.5
1.5
1.0
Output Current,IOUT(A)
3.0
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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P1886
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
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