One Cell Lithium-ion/Polymer Battery Protection IC
GENERAL DESCRIPTION
The HT4301 series product is a high integration
solution for lithium-ion/polymer battery protection.
HT4301 contains advanced power MOSFET,
high-accuracy voltage detection circuits and delay
circuits. HT4301 is put into an ultra-small
SOT23-5 package and only one external
component makes it an ideal solution in limited
space of battery pack.
HT4301 has all the protection functions required
in the battery application including overcharging,
overdischarging, overcurrent and load short
circuiting
protection
etc.
The
accurate
overcharging detection voltage ensures safe and
full utilization charging. The low standby current
drains little current from the cell while in storage.
The device is not only targeted for digital cellular
phones, but also for any other Li-Ion and Li-Poly
battery-powered information appliances requiring
long-term battery life.
HT4301
FEATURES
Integrate Advanced Power MOSFET with
Equivalent of 54m
RDS(ON)
Ultra-small SOT23-5 Package
Only One External Capacitor Required
Over-temperature Protection
Overcharge Current Protection
Three-step Overcurrent Detection:
-Overdischarge Current 1
-Overdischarge Current 2 (optional)
-Load Short Circuiting
Charger Detection Function
0V Battery Charging Function
Delay Times are generated inside
High-accuracy Voltage Detection
Low Current Consumption
Operation Mode: 5.0μA typ.
Power-down Mode: 0.1μA max.
RoHS Compliant and Lead (Pb) Free
APPLICATIONS
One-Cell Lithium-ion Battery Pack
Lithium-Polymer Battery Pack
Ver1.0
1
HT4301
ABSOLUTE MAXIMUM RATINGS
(Note: Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum
rating conditions for long periods may affect device reliability.)
PARAMETER
Input voltage between VCC and GND
VDD input pin voltage
VM input pin voltage
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Lead Temperature ( Soldering, 10 sec)
Power Dissipation at T=25°C
Package Thermal Resistance (Junction to Ambient)
Package Thermal Resistance (Junction to Case)
θJA
VALUE
-0.3 to +6
-0.3 to VCC+0.3
-6 to 10
-40 to 85
125
-55 to 150
300
0.4
250
130
UNIT
V
V
V
°C
°C
°C
°C
W
°C/W
°C/W
θJC
ELECTRICAL CHARACTERISTICS
Parameter
Detection Voltage
Overcharge Detection Voltage
Overcharge Release Voltage
Overdischarge
Voltage
Overdischarge
Voltage
Detection
Release
V
CU
V
CL
V
DL
V
DR
V
CHA
Symbol
Typicals and limits appearing in normal type apply for T
A
= 25
o
C, unless otherwise specified
Test Condition
Min
Typ
Max
Unit
V
CU
-0.050
V
CL
0.050
V
DL
s-0.100
V
DR
-0.100
-0.07
VCU
VCL
VDL
VDR
-0.12
VCU
+0.050
VCL
+0.050
VDL
+0.100
VDR
+0.100
-0.2
V
V
V
V
V
Charger Detection Voltage
Detection Current
Overdischarge
Detection
Current1
I
IOV1
I
IOV2
I
SHORT
V
DD
=3.5V
V
DD
=3.5V
V
DD
=3.5V
IIOV
1
6.0
20
1.5
IIOV1
9.0
30
A
A
A
Overdischarge Current 2
Detection Current (optional)
Load Short-Circuiting
Detection
Current Consumption
Current Consumption in
Normal
Ver1.0
Operation
I
OPE
V
DD
=3.5V
V
M
=0V
5
μA
3
HT4301
FUNCTIONAL DESCRIPTION
The HT4301 monitors the voltage and current of a
battery and
protects
it
from
being
damaged
due
to overcharge voltage,
overdischarge voltage, overdischarge current,
and
short
circuit
conditions
by
disconnecting the battery from the load
or charger. These functions are required in
order to operate the battery cell within specified
limits. The device requires only one external
capacitor. The MOSFET is integrated and its
RDS(ON) is as low as 54 m
typical.
Normal operating mode
If no exception condition is detected, charging
and discharging can be carried out freely. This
condition is called the normal operating mode.
starts, the HT4301 turns the charging control FET
on and returns to the normal condition. The
release mechanism is as follows: the discharging
current flows through an internal parasitic diode of
the charging FET immediately after a load is
connected and discharging starts, and the VM pin
voltage increases about 0.7 V (forward voltage of
the diode) from the GND pin voltage momentarily.
The HT4301detects this voltage and releases the
overcharge condition. Consequently, in the case
that the battery voltage is equal to orlower than
the overcharge detection voltage (V
CU
), the
HT4301 returns to the normal condition
immediately, but in the case the battery voltage is
higher than the overcharge detection voltage
(V
CU
),the chip does not return to the normal
condition until the battery voltage drops below the
overcharge detection voltage (V
CU
) even if the
load is connected. In addition, if the VM pin
voltage is equal to or lower than the overcurrent 1
detection voltage when a load is connected and
discharging starts, the chip does not return to the
normal condition.
Remark
If the battery is charged to a voltage
higher than the overcharge detection voltage (V
CU
)
and the battery voltage does not drops below the
overcharge detection voltage (V
CU
) even when a
heavy load, which causes an overcurrent, is
connected, the overcurrent 1 and overcurrent 2
do not work until the battery voltage drops below
the overcharge detection voltage (VCU). Since an
actual battery has, however, an internal
impedance of several dozens of mΩ, and the
battery voltage drops immediately after a heavy
5
Overcharge Condition
When the battery voltage becomes higher than
the overcharge detection voltage (V
CU
)during
charging under normal condition and the state
continues for the overcharge detection delay time
(t
CU
) or longer, the HT4301 turns the charging
control FET off to stop charging. This condition is
called the overcharge condition. The overcharge
condition is released in the following two cases:
1, When the battery voltage drops below the
overcharge release voltage (V
CL
), the HT4301
turns the charging control FET on and returns to
the normal condition.
2, When a load is connected and discharging
Ver1.0
模拟与混合信号
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
