uP6014

4

uP6014-DS-P0000, July 2015

www.upi-semi.com

Functional Description

The uP6014 integrates an N-channel and P-channel

MOSFETs to realize a synchronous rectifier. The power

conversion efficiency is up to 90%. Since a typical step-

up converter has a conduction path from the input to the

output via the body diode of the P-channel MOSFET, a

specific circuit is used to reverse the polarity of the P-

channel body diode when the part is shutdown. It certainly

protects battery from being completely depleted during

shutdown.

Input Supply Voltage, V

BAT

V

voltages. The supply voltage range is from 2.5V to 5.5V. A

power on reset (POR) continuously monitors the input

supply voltage. The POR level is typically 2.2V at V

BAT

rising. A minimum 47uF ceramic capacitor with shortest

PCB traces is highly recommended for bypassing the

supply input.

Current Limit Function

When the inductor current is higher than current limit

threshold, the current limit function activates and forces

the N-channel MOSFET turning off to limit inductor current

cycle-by-cycle. The current limit threshold will be setting

to 3A when V

73% (Typ) of setting, the short circuit protect function (SCP)

will be active.

Output Voltage Setting and Feedback Network

The output voltage can be set from VFB to VOUT by a

voltage divider as:













+

×

=

2

R

1

R

1

V

V

FB

OUT

The internal VREF is 1.227V with 1.5% accuracy. In real

applications, a 22pF feedforward ceramic capacitor is

recommended in parallel with R1 for better transient

response.

Over Voltage Protection

When output voltage reached 6V (Typ), the output over

voltage will be triggered to prevent external component from

being damaged.

Over Temperature Protection (OTP)

The OTP is triggered and shuts down the uP6014 if the

non-latch type protection. The uP6014 automatically

initiates another soft start cycle if the junction temperature

Fixed Mode

The uP6014 is implemented with a fixed 5.2V output voltage

function without the need of an external feedback voltage

divider. If the FB pin is shorted to GND during device start-

up, the uP6014 will automatically activate its internal

feedback network and regulate its output at 5.2V(typ.).