Copyright ANPEC Electronics Corp.
Rev. A.4 - Jan., 2010
APL3206/A/B
www.anpec.com.tw10
Function Description
ACIN Power-On-Reset (POR)
The APL3206/A/B has a built-in power-on-reset circuit to
keep the output shutting off until internal circuitry is oper-
ating properly. The POR circuit has hysteresis and a de-
glitch feature so that it will typically ignore undershoot
transients on the input. When the input voltage exceeds
the POR threshold and after 8ms blanking time, the out-
put voltage starts a soft-start to reduce the inrush current.
ACIN Over-Voltage Protection (OVP)
The input voltage is monitored by the internal OVP circuit.
When the input voltage rises above the input OVP
threshold, the internal FET will be turned off within 1ms to
protect connected system on OUT pin. When the input
voltage returns below the input OVP threshold minus the
hysteresis, the FET is turned on again after 8ms recovery
time. The input OVP circuit has a 300mV hysteresis and
a recovery time of TON(OVP) to provide noise immunity against
transient conditions.
Over-Current Protection (OCP)
The output current is monitored by the internal OCP circuit.
When the output current reaches the OCP threshold, the
device limits the output current at OCP threshold level. If
the OCP condition continues for a blanking time of TB(OCP),
the internal power FET is turned off. After the recovery
time of TON(OCP), the FET will be turned on again. The
APL3206/A/B has a built-in counter. When the total count
of OCP fault reaches 16, the FET is turned off permanently,
requiring a VACIN POR again to restart.
Battery Over-Voltage Protection
The APL3206/A/B monitors the VBAT pin voltage for bat-
tery over-voltage protection. The battery OVP threshold is
internally set to 4.35V. When the VBAT pin voltage ex-
ceeds the battery OVP threshold for a blanking time of TB
(BOVP), the internal power FET is turned off. When the VBAT
voltage returns below the battery OVP threshold minus
the hysteresis, the FET is turned on again. The APL3206/
A/B has a built-in counter. When the total count of battery
OVP fault reaches 16, the FET is turned off permanently,
requiring a VACIN POR again to restart.
Over-Temperature Protection
When the junction temperature exceeds 160oC, the inter-
nal thermal sense circuit turns off the power FET and
allows the device to cool down. When the device’s junc-
tion temperature cools by 40oC, the internal thermal
sense circuit will enable the device, resulting in a pulsed
output during continuous thermal protection. Thermal pro-
tection is designed to protect the IC in the event of over
temperature conditions. For normal operation, the junc-
tion temperature cannot exceed TJ=+125oC.
Internal P-MOSFET
The APL3206/A/B integrates a P-channel MOSFET with
the body diode reverse protection to replace the external
P-MOSFET and Schottky diode for cell phone’s PMIC. The
body diode reverse protection prevents a reverse current
flowing from the battery back to CHRIN pin. During power-
on, when CHRIN voltage rises above the VBAT voltage by
more than 150mV, the body diode of the P-channel
MOSFET is forward biased from OUT to CHRIN, and P-
MOSFET is controlled by the external GATDRV voltage.
When the CHRIN voltage drops below VBAT+20mV, the
body diode of the P-channel MOSFET is forward biased
from CHRIN to OUT and P-channel MOSFET is turned
off. When any of input OVP, OCP, battery OVP, is detected,
the internal P-channel MOSFET is also turned off.
The APL3206/A/B VIN input pin fully supports the
IEC61000-4-2. That means the VIN pin has immunity of
±15kV ESD discharge in Air condition, and immunity of
±8kV ESD discharge in Contact condition.
ESD Tests