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P1886 Datasheet

PWM CONTROL 3A STEP-DOWN CONVERTER

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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
Package
SOP-8
HSOP-8
Packing
Tape Reel
Tape Reel
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
1 of 7
QW-R103-042.D




UTC

P1886 Datasheet Preview

P1886 Datasheet

PWM CONTROL 3A STEP-DOWN CONVERTER

No Preview Available !

P1886
MARKING
LINEAR INTEGRATED CIRCUIT
PIN CONNECTIONS
NC 1
VCC 2
Output 3
VSS 4
8 NC
7 EN
6 NC
5 FB
PIN DESCRIPTIONS
PIN NO
2
3
4
5
7
NAME
VCC
Output
VSS
FB
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
+
- FB
Thermal Shutdown
VEN
Vss
VCC EN
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R103-042.D


Part Number P1886
Description PWM CONTROL 3A STEP-DOWN CONVERTER
Maker UTC
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