NJW4108
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Lithium-ion Battery Charger Controller IC with Timer
■GENERAL DESCRIPTION ■PACKAGE OUTLINE
■FEATURES
● Adjustable Charge Voltage
● Adjustable Pre-Charge and Full Charge Current
● Temperature Monitor
● Over Charge Timer
● Internal Re-Charge function
● Delay timers and Hysteresis inputs for high noise immunity
● Over Discharge Battery Detect
● Over Voltage Protection
● Bi-CMOS Technology
● Package Outline NJW4108V : SSOP20
■PIN CONFIGURATION
The NJW4108 is a Lithium-ion Battery Charger Controlle
r
IC with over charger timer.
Charger current and voltage can individually be set by th
e
external resistors. Therefore, it can be used for a wide rang
e
of battery cells for both 1-cell and 2-cell applications.
It includes a lot of safety features for safety consciou
s
design: Over voltage, Over discharge, temperature monito
r
and over charge timers.
1
4
3
2
20
17
18
19
5
6
7
10
8
9
14
11
12
13
15
16
P-CHG
NFB
CNT
GND
NC
F-CHG
LED-G
LED-R
C1
C2 CHG-SW
TL
TH
TDET
V+
VREF
VS
CS2
CS1
Q-CHG
NJW4108V
NJW4108V
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■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Operating Voltage V+ +15 V
C1 Pin Voltage VC1 +5 V
C2 Pin Voltage VC2 +5 V
TDET Pin Voltage VTDET +5 V
CNT Pin Output Current ISINK-CNT 50 mA
LED-G Pin Output Current ISINK-G 20 mA
LED-R Pin Output Current ISINK-R 20 mA
Power Dissipation PD SSOP20 :300 mW
Operating Temperature Range TOPR -20 ~ +85 °C
Storage Temperature Range TSTG -40 ~ +125 °C
■ELECTRICAL CHARACTERISTICS (V+=5V, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
General Characteristics
Operating Voltage VOP – – 14 V
Operating Current ICC CHG-SW: OPEN – 2 3 mA
Under Voltage Lockout Block
ON Threshold Voltage VT-ON 2.2 2.4 2.6 V
OFF Threshold Voltage VT-OFF 2.0 2.2 2.4 V
Hysteresis Voltage VHYS 100 200 300 mV
Reference Voltage Block
Reference Voltage VREF I
REF=0mA 1.228 1.24 1.253 V
Load Regulation ∆VREF I
REF=0mA~1mA – –
10 mV
Voltage Detection Block
Quick Charge Detection Voltage VQ-CHG VS: L→H VBAT
x 0.71
VBAT
x 0.73
VBAT
x 0.75 V
Re-Charge Detection Voltage VR-CHG VS: H→L VBAT
x 0.94
VBAT
x 0.95
VBAT
x 0.96 V
Over Voltage Detection Voltage VOV VS: L→H VBAT
x 1.015
VBAT
x 1.025
VBAT
x 1.035 V
Charge Control Block
Reference Voltage VREF-CV VS Pin 4.17 4.2 4.23 V
VS Pin Input Bias Current IVS VS=4.2V – 50 500 nA
Battery Connected
Detection Voltage VT-TDET TDET Pin – 1.15 – V
Low Voltage Detection (2mA Charge) Block
Charge Current ICHG1 VS=1V 1 2 3 mA
Low Voltage Detection Voltage VLV VS: L→H VBAT
x 0.455
VBAT
x 0.475
VBAT
x 0.495 V
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■ELECTRICAL CHARACTERISTICS (V+=5V, Ta=25°C)
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Current Detection Block
Pre-Charge /Quick Charge Block
Voltage Gain AV1 CS1=3.8V, CS2=3.6V 11.5 12 12.5 dB
Full Charge Block Voltage Gain AV2 CS2=VS=4.2V, VF-CHG=96mV 15.5 18 21 dB
F-CHG Pin Input Voltage Range VF-CHG CS2=VS=4.2V 48 – – mV
CS1 Pin Input Bias Current ICS1 CS1=4.2V – 10 500 nA
CS2 Pin Input Bias Current ICS2 CS2=4.2V – 10 500 nA
Output Block
CNT Pin Saturation Voltage VOL-CNT I
SINK=20mA – 0.2 0.5 V
CNT Pin Leak Current ILEAK-CNT V
+=14V – – 1
µA
Temperature Detection Block
Abnormal Temperature
LED Blinking TBLINK-G VTL>VTDET, VTDET<VTH ,T=4µs 0.512 1.024 2.048 ms
LED Out Block
LED-G Pin Saturation Voltage VOL-G I
SINK=10mA – 0.2 0.5 V
LED-G Pin Leak Current ILEAK-G V
+=14V – – 1
µA
LED-R Pin Saturation Voltage VOL-R I
SINK=10mA – 0.2 0.5 V
LED-R Pin Leak Current ILEAK-R V
+=14V – – 1
µA
Timer Block
OSC1 Timer Error Time ∆T1 -10
– +10 %
OSC2 Timer Error Time ∆T2
C1=C2=0.01µF external
Not including external deviation -10 – +10 %
CHG-SW Block
ON Threshold Voltage VSW-ON – –
0.25 V
OFF Threshold Voltage VSW-OFF 1 – –
V
Pull-up Resistance RPULL-UP 300 500 700 kΩ
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■TYPICAL APPLICATION
VREF1
VREF2
OSC
1
OSC
2
CLK
Control
Logic
6dB
CVCC-ON
VREF2
12dB
CVCC-ON
Quick/
Pre-Charge
CVCC-ON
CS1 pin
LED-G
LED-R
2mA
Charge
Charge
ON/OFF
Battery
Voltage
Detection
RP1
RP2
RQ1
RQ2
Q-CHGP-CHG
VREF
CS2
NFB
CS1
RB1
RB2
VS
Rcs
CS2
F-CHG
CNT
RF1
RF2
VREF
TDET
TH
TL
Lithium Ion Battery
VREF
C1
C2
LED-G
LED-R
GND
VREF
V+
Input
GND
When is １-cell、
RB1：Short
RB2：Open
Re-Charge
Quick Charge
Over Voltage
Detection
Low Voltage
Detection
RPULL-UP
V+
V+
CHG-SW
Low Temperature
Detection
High Temperature
Detection
Battery Connected
Detection
UVLO
Pre-Charge
Control
Quick Charge
Control
Reference
Voltage 1
1.24V
Reference
Voltage 2
4.2V
Full
Charge
Timer
Pre-
Charge
Timer
Full Charge
Detection
Start/St op
Time Out
Start/St op
Time Out
VBAT x 0.95
VBAT x 0.73
VBAT x 1.025
VBAT x 0.475
Charge
-ON
Charge
-ON
Te mp .
Detection
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■PIN CONFIGULATION
Pin No. Pin Name Function
1 P-CHG Pre-Charge Current Setting
2 NFB Current-Regulation-Loop Compensation
3 CNT Charge Control for Output Pin (External PNP Transistor)
4 GND GND
5 NC
6 F-CHG Full Charge Current Setting
7 LED-G LED Output
8 LED-R LED Output
9 C1 Pre-Charge Timer, 2mA Charge Timer, LED Blinking Cycle, Delay Time Setting
10 C2 Quick Timer Setting
11 CHG-SW Charge ON/OFF Control
12 TL Batteries Thermal (High Temperature) Setting
13 TH Batteries Thermal (Low Temperature) Setting
14 TDET Battery Temperature Detection, Battery Connected Detection
15 V+ Operating Voltage
16 VREF Reference Voltage Output
17 VS Battery Voltage Detection
18 CS2 Charge Current Detection 2
19 CS1 Charge Current Detection 1
20 Q-CHG Quick Charge Current Setting
■CHARGE VOLTAGE / CURRENT for RESISTANCE SETTING
Parameter Calculation formula Examples of calculation
Charge Control Voltage VBAT =2B
2B1B
R
RR +x VREF-CV (4.2V) 4.2V 8.4V
Low Voltage Detection Voltage VBAT x 0.475 2.00V 3.99V
Quick Charge Start Voltage VBAT x 0.73 3.07V 6.13V
Re-Charge Detection Voltage VBAT x 0.95 3.99V 7.98V
Over Voltage Detection Voltage VBAT x 1.025 4.305V 8.61V
Pre-Charge Current IP-CHG = ( 2P1P
2P
RR
R
+x VREF (1.24V) / 4) / RCS
(at. RP1:232kΩ, RP2:16kΩ, RCS=0.2Ω)
100mA
Quick Charge Current IQ-CHG = ( 2Q1Q
2Q
RR
R
+x VREF (1.24V) / 4) / RCS
(at. RQ1:128kΩ, RQ2:120kΩ, RCS=0.2Ω)
750mA
Full Charge Current IF-CHG = ( 2F1F
2F
RR
R
+x VREF (1.24V) / 8) / RCS
(at. RF1:114.4kΩ, RF2:9.6kΩ, RCS=0.2Ω)
60mA
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■TYPICAL CHARACTERISTICS
4.14
4.16
4.18
4.2
4.22
4.24
4.26
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Reference Voltage
VREF-CV (V)
Charge Control Block Reference Voltage
vs. Temperature (V
+=5V, VS Pin)
1.22
1.225
1.23
1.235
1.24
1.245
1.25
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Reference Voltage VREF (V)
Reference Voltage vs. Temperature
(V+=5V, IREF=0mA)
11.4
11.6
11.8
12
12.2
12.4
12.6
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Pre-Charge/Quick Charge Block
Voltage Gain AV1 (dB)
Pre-Charge/Quick Charge Block Voltage Gain
vs. Temperature (V
+=5V, CS1=3.8V, CS2=3.6V)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Threshold Voltage (V)
CHG-SW Block Threshold Voltage
vs. Temperature (V
+=5V)
VSW_OFF
VSW_ON
0
0.5
1
1.5
2
2.5
3
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Operating Current ICC (mA)
Operating Current vs. Temperature
(V+=5V, CHG-SW:OPEN)
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■TYPICAL CHARACTERISTICS
0
0.1
0.2
0.3
0.4
0.5
0 1020304050
Saturation Voltage VOL-CNT (V)
CNT Pin Saturation Voltage vs. Sink Current
(V+=5V, Ta=25oC)
Sink Current ISINK (mA)
0
0.1
0.2
0.3
0.4
0.5
0 5 10 15 20
Saturation Voltage VOL (V)
LED Pin Saturation Voltage vs. Sink Current
(V+=5V, Ta=25oC)
Sink Current ISINK (mA)
LED-R
LED-G
1
10
100
0.001 0.01 0.1
Oscillation Cycle OSC1, OSC2 (ms)
Oscillation Cycle vs. Capacitance
(V+=5V, Ta=25oC)
Capacitance C1, C2 (µF)
6
7
8
9
10
11
12
13
14
-50 -25 0 25 50 75 100 125
Ambient Temperature
Ta (oC)
Oscillation Cycle OSC1, OSC2 (ms)
Oscillation Cycle vs. Temperature
(V+=5V, C1=C2=0.01µF)
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■FEATURE DESCRIPTION
1. Voltage Detection Block (VS pin)
The VS pin determines charge voltage, low voltage, over voltage, and re-charge voltage. Battery voltage conditions are
constantly monitored. (Figure 1)
1-1. Charge Voltage (VS pin)
Charge voltage VBAT is set using the VS pin external
resistors RB1 and RB2 and the following equation:
VBAT =2B
2B1B
R
RR +x VREF-CV (4.2V)
Using the following settings makes it easy to support
applications for one or two cells: for one cell, RB1= short,
and RB2= open; for two cells, RB1=RB2.
If you use a high resistance, the VS pin's bias current will
cause incorrect values. Use as low a resistance as
possible.
1-2. Overcharge Detection Block (VS pin)
The overcharge detection block stops charging when a
high voltage is detected at the VS pin.
The overcharge detection voltage is obtained with the following equation:
VOV=VBAT × 1.025 (typ.)
When overcharge is detected, charging is prohibited and LED-R blinks. After that, charge will continue to be prohibited, even
after battery voltage drops to a normal value. Turning the power off to release UVLO, battery connection detection, or
CHG-SW switching will enable the charge sequence to restart.
1-3. Low Voltage Detection (2mA charge) Block (VS pin, CS1 pin)
The low voltage detection block detects an
over-discharged battery, or an open battery caused by
the battery protection circuit or the like. This will
determine a 2mA charge prior to pre-charging.
The low voltage detection voltage is obtained with the
following equation:
VLV=VBAT × 0.475 (typ.)
During a 2mA charge, the block monitors battery voltage
recovery while a steady 2mA current is output from the
CS1 pin. (Figure 2)
If voltage does not recover within a prescribed time, the
timer will prohibit 2mA charging. Turning the power off to
release UVLO, battery connection detection, or CHG-SW
switching will enable the charge sequence to restart.
1-4. Re-Charge Detection (VS pin)
When a fully charged battery is left for a long period of time, voltage will drop due to self-discharge. The re-charge detection
block detects a drop in voltage and re-charges the battery.
The re-charge detection voltage is obtained with the following equation.
VR-CHG=VBAT × 0.95 (typ.)
Low Voltage
Detection
12dB
CS1
RB1
RB2
VS
Rcs
CS2
To C h arge
Output
Control Bloc
k
2mA Charge
Current
To Charge Current
Control Amp
2mA Charge
VBAT x 0.475
RB1
RB2
VS
To Ch arg e
Control Block
To OR
Circuit
Charge Voltage
Control Amp
VREF2
CVCC-ON
Low Voltage
Detection
Over Voltage
Detection
Recharge
Detection
Quick Charge
Detection
Battery
Voltage
Detection
For 1 Cell
RB1: Short
RB2: Open
VBAT x 0.95
VBAT x 0.73
VBAT x 1.025
VBAT x 0.475
Figure 1. Voltage Detection Block Configuration
Figure 2. 2mA Charging Block
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■FEATURE DESCRIPTION (CONTINUE D)
2. Current Detection Block (CS1 pin, CS2 pin)
A current detection resistor RCS is inserted between pin CS1 and pin CS2 to monitor battery charge current.
The input voltage between pin CS1 and pin CS2 is amplified by the 12dB current detection amp and fed back to the charge
current control amp. (Figure 3)
2-1. Pre-Charge Current, Quick Charge Current (P-CHG pin, Q-CHG pin)
This will switch between charging with pre-charge current or quick charge current according to the level of the battery
voltage VBAT that is input from the VS pin.
VBAT x 0.475 to VBAT x 0.73 Pre-charge control
VBAT x 0.73 to VBAT Quick charge control
Pre-charge and quick charge current values are determined by the P-CHG pin and the Q-CHG pin voltage settings.
Settings are made according to the following formulae.
Pre-Charge Current Value
IP-CHG = ( 2P1P
2P
RR
R
+x VREF (1.24V) / 4) / RCS
Quick Charge Current Value
IQ-CHG = ( 2Q1Q
2Q
RR
R
+x VREF (1.24V) / 4) / RCS
2-2. Full Charge Detection (F-CHG pin)
Charge termination is determined by a set full
charge current IF-CHG., which is determined by a
voltage setting on the F-CHG pin.
IF-CHG = ( 2F1F
2F
RR
R
+x VREF (1.24V) / 8) / RCS
When charging is terminated, LED-G turns on,
and the sequence moves to the re-charge
detection operation.
Figure 3. Block for Controlling Pre-Charge, Quick Charge,
and Block for Detecting Full Charge.
To O R
Circuit
Quick Charge
Detection
Full Charge
Detection 6dB
CVCC-ON
12dB
Pre-Charge
Current Setting
Quick Charge
Current Setting
Quick/
Pre-Charge
RP1
RP2
RQ1
RQ2
Q-CHG P-CHG
VREF
CS2
NFB
CS1
RB1
RB2
VS
Rcs
CS2
F-CHG
RF1
RF2
VREF
To Charge
Output
Switch Pre/Quic
k
Charge Current
Control Block
To Charge Voltage
Control Amp
Charge Current
Control Amp
VBAT x 0.73
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■FEATURE DESCRIPTION (CONTINUE D)
3. Charge Control Output Block (CNT pin)
A PNP transistor connected to the CNT pin controls the voltage and current required to charge the battery.
When the CHG-SW pin and battery-connected detection are both ON the system moves to charge control mode. If battery
voltage and temperature conditions are appropriate, charging will begin. During 2mA charging the PNP transistor will go to
OFF status.
4. Temperature Detection Block, Battery Connected Detection Block (TDET pin, TH pin, TL pin)
The charge temperature range is set with the TL pin (high temperature) and the TH pin (low temperature).
The threshold voltage for the temperature detection comparator is set with the external resistors RTHL, RTH, RTL. Therefore,
you can select any type of thermistor (NTC) and any charge temperature range (Figure 4).
The TL pin and the TH pin are set to go to the potential states shown below for fluctuations in TDET voltage.
VTL (high temperature) < VTDET (charge Temperature) < VTH (low temperature)
Pin voltages are obtained from the
following formulae.
TDET pin (thermistor setting)
)V24.1(REF
TTDET
T
TDET V
RR
R
V×
+
=
TH pin (low temperature setting)
)V24.1(REF
TLTHTHL
TLTH
TH V
RRR
RR
V×
++
+
=
TL pin (high temperature setting)
)V24.1(REF
TLTHTHL
TL
TL V
RRR
R
V×
++
=
Figure 4 Temperature Detection Block
When the detected temperature goes out of the range of the set values, charging stops, and LED-G slow blinking and
LED-R turn off. After temperature is restored, charging recommences in line with battery voltage status.
The TDET pin is also used for the battery-connected detection feature.
The battery-connected detection feature determines that a battery is connected if TDET pin voltage is no greater than
1.15V(typ.), and commences charging.
Battery Connected
Detection
Low Temperature
Detection
High Temperature
Detection
TDET
TH
TL
Lithium Ion Battery
VREF
To CHG-SW
R
TL
R
TH
R
THL
R
TDET
R
T
To UVL O
VT-TDET=1.15V
Charge
-ON
Charge
-ON
Temp .
Detection
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■FEATURE DESCRIPTION (CONTINUE D)
5. Delay Circuits (each detection block)
Each detection block has a delay circuit and extra features for preventing malfunction due to noise or excess signals.
Table 1 Delay Circuits and Extra Features.
Detection Block Delay Circuit Extra Feature
Low Voltage Malfunction
Prevention Circuit Hysteresis
CHG-SW Hysteresis
Battery Connected
Detection Hysteresis
Temperature Detection Hysteresis
Full Charge Detection –
Re-Charge Detection –
Low Voltage Detection Hysteresis
Over Voltage Detection
Delay I
Latch
Quick Charge Detection Delay II Hysteresis
The delay circuit block receives a signal from the timer circuit to fix a delay time.
For details on the relationship between the delay time and capacitors see “6. Timer Circuit Block”.
6. Timer Circuit Block (C1 pin, C2 pin)
OSC1 is used for the timer that is used for pre-charge, 2mA charge and the like. OSC2 is used for the quick charge timer.
You can change the time of the timers with external capacitors. Tables 2, 3 show the relationship between capacitance and
time.
Table 2 C1, C2 Oscillation Cycle t
Capacitance (C1, C2) Oscillation Cycle
(OSC1, OSC2)
4700pF t = 4.7ms
0.01µF t = 10ms
0.022µF t = 22ms
0.047µF t = 47ms
Table 3 Timer Time
Use capacitors the have good temperature characteristics in the OSC block.
Capacitor deviation will cause timer errors.
Block Name Parameter Calculation
Formula
Examples
2mA Charge Timer tx210 10.2s
Pre-Charge Timer tx217 22min.
LED R Blinking Cycle
(Time out, Over voltage) tx27 1.28s
LED G Blinking Cycle
(Abnormal temperature)tx28 2.56s
Delay I tx25 0.32s
Pre-Charge Timer
Delay II tx24 0.16s
C1=0.01µF
Quick Charge Timer Quick Charge Timer tx220 2hours 55 min. C2=0.01µF
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■FEATURE DESCRIPTION (CONTINUE D)
In each charge mode if time-over occurs charging is prohibited and LED-R blinks. Turning the power off to release UVLO,
battery connection detection, or CHG-SW switching will enable the charge sequence to restart.
NJW4108 incorporates a test mode that shortens the timer block function's test time by 1/150,000.
To operate in test mode set the TH pin voltage to a value no greater than that of the TL pin. In test mode, regardless of the
external timing capacitors C1, C2, the internal timer clock frequency will operate in a range of approximately 200kHz to
300kHz. The following shows calculation values when the oscillating frequency is 250kHz (4µs cycle).
Table 4. Timer Times in Test Mode.
When the TDET pin voltage is approximately 1.2V or greater, the pre-charge / quick charge timers operate normally.
If you want to further reduce the test time, setting TDET pin voltage makes it possible to run each of the timer counters
divided in half. When the TDET pin is approximately 0.3V or less, the first half of the counter is bypassed. When the voltage
is approximately greater than 0.4V and less than 1.1V, the second half of the counter is bypassed.
Table 5. Reduced Test Time Mode
Block Name Parameter Calculation
Formula
Example
(t = Appx. 4µs)
2mA Charge Timer tx210 Appx. 4ms
Pre-Charge Timer tx217 Appx. 0.5s
LED R Blinking Cycle tx27 Appx. 0.5ms
Delay I tx25 Appx. 0.13ms
Pre-Charge Timer
Delay II tx24 Appx. 64µs
Quick Charge Timer Quick Charge Timer tx220 Appx. 4.2s
Parameter Calculation
Formula Example (t =Appx. 4µs)
Pre-Charge Timer tx28 , tx28 Appx. 1ms, Appx. 1ms
Quick Charge Timer tx29 , tx210 Appx. 2ms, Appx. 4ms
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■FEATURE DESCRIPTION (CONTINUE D)
7. Reference Voltage Block (VREF pin)
This block generates 1.24V and 4.2V reference voltages. The VREF pin outputs 1.24V. In addition to the IC internal
reference voltage, this is also used as a reference voltage for charge current setting and temperature detection setting.
It is not recommended to connect a capacitor to VREF pin.
It will take a long time to start-up of reference voltage when a capacitor is connected to VREF pin.
Therefore, it may cause malfunction of logic, charge voltage and charge current circuit.
8. Power Block, Under Voltage Lockout Circuit (UVLO) Block (V+ pin, GND pin)
An integrated Under Voltage Lockout circuit prevents IC malfunction when power is turned on or off. This circuit
incorporates a 200mV hysteresis width to prevent chattering.
As required, insert a bypass capacitor near the IC's V+ pin when there is power line noise or when wires are long.
9. LED Block (LED-R pin, LED-G pin)
The 2 LEDs can indicate charge status. (Figure 5)
The LED drive circuit is an open collector output configuration.
Therefore, it is easy to set a constant LED drive current with resistance values.
The expression for setting the current that flows through the LEDs is shown below.
ILED-G ≒ (Vcc - VF-LED - VOL-G) / RLED
or
ILED-R ≒ (Vcc - VF-LED - VOL-R) / RLED
Figure 5. LED Drive Circuit
LED-G
LED-R
Input
VF-LED
ILED
RLED
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■FLOW CHART
Start
Pre-Charge
Timer Start
YES
NO
Check
Adapter Voltage
V+>2.4V
Check
Battery Temp.
VTL<VTDET<VTH
YES
NO
YES
NO
Check
Battery Voltage
VBAT<VOV
YES
NO
Check
Voltage
VBAT>VQ-CHG
Quick Charge
Timer Start
Quick Charge Start
LED-G: OFF
LED-R: ON
YES
NO
Time Out
YES
NO
Battery
Battery Voltage
VBAT>VQ-CHG
Time Out
NO
Check
Full Charge
IBAT<IF-CHG
YES
Charge Complete
LED-G: ON
LED-R: OFF
Check
Battery Voltage
VBAT<VR-CHG
YES
NO
NO
YES
Check
Battery Connection
CHG-SW Pin=GND
YES
NO
Abnormal Charging
Prohibited
LED-G: OFF
LED-R: OFF
LED-G: OFF
LED-R: ON
2mA Charge: ON
Abnormal Charging
Prohibited
LED-G: OFF
LED-R: Blinking
Pre-Charge Start
2mACharge: OFF
YES
NO
Chec
k
Battery Voltage
VBAT>VLV
YES
NO
Time Out
NO
Check
Battery Connection
VTDET<1.15V
YES
A
daptor voltage, Battery connection, and
Battery voltage are monitored during
charging.
When charging is prohibited, one of the
following action resumes the charging;
Unplug and plug power supply
Remove and set batteries
Charge-SW ON/OFF
Abnormal Charging
Prohibited
LED-G: Slow Blinking
LED-R: OFF
Battery Temp is monitored during charging.
NJW4108
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Ver.2013-02-12
■TIMING CHART
Battery
Voltage
0V
Charging
Current
Pre-
Charge
Quick
Charge
Constant
Voltage
Charge
Full
Charge
CHG-SW
LED-R
LED-G
ON
Re-
Charge
Pre-Charge Current
Full Charge Current
Quick Charge
Detecting Voltage
Quick Charge Current
Charge Control Voltage
Re-Charge Detecting Voltage
ON
OFF ON
ON OFF
OFF
OFF
OFF
■The timing chart at the time of protection circuit operation
In addition to a charge timing chart, a protection circuit with a built-in IC operates according to the state and
circumference environment of a battery.
The timing chart when various protection circuits operate is as follows.
●Pre-charge time out ●Quick charge time out
Battery
Voltage
0V
Charge
Current
CHG-SW
LED-R
LED-G
ON
Quick charge detecting voltage
ON
OFF
OFF
CNT
Inactive
OFF
Pre-charge
22min*
0V
Charge
Current
CHG-SW
LED-R
LED-G
ON
Charge Voltage
ON
OFF
OFF
CNT
OFF
Quick charge
3h*
Full charge
detection
*C1=0.01µF *C2=0.01
µ
F
ON/OFF 1.28s* ON/OFF
A
ctive Inactive Inactive
A
ctive Inactive
Battery
Voltage
NJW4108
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●Low voltage battery (Return) ●Low voltage battery (Abnormalities)
Battery Voltage
0V
Charge
Current
CHG-SW
LED-R
LED-G
ON
Low voltage
detecting voltage
ON
OFF
OFF
CNT
OFF
Pre-charge
2m
A
Battery Voltage
0V
Charge
Current
CHG-SW
LED-R
LED-G
ON
Low voltage
detecting voltage
ON
OFF
OFF
CNT
OFF
Charge
STOP
2m
A
ON/OFF 1.28s*
2mA charge
10s*
*C1=0.01
µ
F
2mA charge
10s*
*C1=0.01
µ
F
Inactive
A
ctive Inactive
●Over charge battery ●Abnormalities in temperature
Battery
Voltage
0V
Charge
Current
CHG-SW
LED-R
LED-G
ON
OFF
CNT
OFF
Charge STOP
0V
Charge
Current
CHG-SW
LED-R
LED-G
ON
OFF
CNT
OFF
Charge STOP
Temp er atu r e
Detecting ON
Over charge detecting
OFF
ON/OFF 1.28s*
*C1=0.01µF
Inactive Inactive
Battery
Voltage
OFF
ON/OFF 2.56s*
NJW4108
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■OPERATION MATRIX
Parameter Battery
Un-connecting
Quick
Charge
Pre-
Charge
2mA
Charge
Full
Charge
Abnormal
Temperature
Over
Voltage
Error
Time
OUT
LED-G OFF OFF OFF OFF ON Slow
Blinking OFF OFF
LED-R OFF ON ON ON OFF OFF Blinking Blinking
Tr. OFF ON ON OFF OFF OFF OFF OFF
Charge
Current - Q-CHG P-CHG 2mA - - - -
Return
Charge - - - - Re-Charge Auto Latch Latch
Timer Stop Operate Operate Operate Stop Stop Stop -
Temperature
Detecting Disregard Operate Operate Operate Operate - Operate Operate
Over
Voltage
Detecting
Disregard Operate Operate Operate Operate Operate - Operate
CHG-SW Stay Operate Operate Operate Operate Re-start Re-start Re-start
Battery
Setting Stay Operate Operate Operate Operate Re-start Re-start Re-start
Full Charge
Detecting Disregard Operate Stop Disregard - Disregard Disregard Disregard
Disregard: Detection function is not reflected in control although it is operating.
■LED ON/OFF PATTERN
NJW4100 NJW4108
Parameter LED-R LED-G LED-R LED-G
Adaptor Voltage
Detecting OFF OFF OFF OFF
Charging ON OFF ON OFF
Full Charging OFF ON OFF ON
Temperature Error OFF OFF OFF SLOW
BLINKING
Over Voltage Detecting BLINKING OFF BLINKING OFF
Time Out BLINKING OFF BLINKING OFF
NJW4108
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■The example of application
●Specification
Input Voltage :more than 5V Charge Battery :Lithium-ion Battery 1cell
Charge Control Voltage :4.2V Quick Charge Start Voltage :3.07V
Pre-Charge Current :100mA Re-Charge Detection Voltage :3.99V
Quick Charge Current :750mA Over Voltage Detection Voltage :4.305V
Full Charge Current :60mA
Charge Temperature Range : 0°C~45°C (thermistor :10kΩ, B value 3435)
●The example of application circuit
1
4
3
2
20
17
18
19
5
6
7
10
8
9
14
11
12
13
15
16
P-CHG
NFB
CNT
GND
NC
F-CHG
LED-G
LED-R
C1
C2 CHG-SW
T
L
TH
TDET
V
+
VREF
VS
CS2
CS1
Q-CHG
SBD
LED2
Green
BATT+
LED1
Red
C1
0.01µF
C2
0.01µF
SW
C
0.1µF
VIN
RTHL
22kΩ
RTDET
15kΩ
RTH
24kΩ
RTL
15kΩ
TDET
BATT-
Q1
VREF
RB1
0Ω (Short)
RB2
Open
RCS
0.2Ω 1/2W
IC NJW4108
CNF
1,000pF
RQ1
130kΩ
RQ2
120kΩ
VREF
VREF
VREF
RP1
110kΩ
RP2
7.5kΩ
RF1
110kΩ
RF2
9.1kΩ
RR
2.2kΩ
RG
910Ω
CIN
47µF
VIN
RBC
390Ω
REB
10kΩ
GND
COUT
Option
Q1 : 2SA1244 (Toshiba)
SBD : EC30LA02 (Nihon Inter)
RCS : RL1632R-R200-F (Susumu)
CIN : MVS16VC47MF46 (Nippon chemi-con)
NJW4108
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Ver.2013-02-12
MEMO
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.