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PDF NJW4108 Data sheet ( Hoja de datos )
| Número de pieza | NJW4108 | |
| Descripción | Lithium-ion Battery Charger Controller with Timer / SSOP20 | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJW4108
Lithium-ion Battery Charger Controller IC with Timer
■GENERAL DESCRIPTION
The NJW4108 is a Lithium-ion Battery Charger Controller
IC with over charger timer.
Charger current and voltage can individually be set by the
external resistors. Therefore, it can be used for a wide range
of battery cells for both 1-cell and 2-cell applications.
It includes a lot of safety features for safety conscious
design: Over voltage, Over discharge, temperature monitor
and over charge timers.
■PACKAGE OUTLINE
NJW4108V
■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
P-CHG 1
NFB
CNT
2
3
GND
4
NC 5
F-CHG
LED-G
LED-R
6
7
8
C1 9
C2 10
20 Q-CHG
19 CS1
18 CS2
17 VS
16 VREF
15 V+
14 TDET
13 TH
12 TL
11 CHG-SW
NJW4108V
Ver.2006-12-09
-1-
1 page  
www.DataSheet4U.com
■PIN CONFIGULATION
Pin No.
Pin Name
1 P-CHG
2 NFB
3 CNT
4 GND
5 NC
6 F-CHG
7 LED-G
8 LED-R
9 C1
10 C2
11 CHG-SW
12 TL
13 TH
14 TDET
15 V+
16 VREF
17 VS
18 CS2
19 CS1
20 Q-CHG
NJW4108
Function
Pre-Charge Current Setting
Current-Regulation-Loop Compensation
Charge Control for Output Pin (External PNP Transistor)
GND
Full Charge Current Setting
LED Output
LED Output
Pre-Charge Timer, 2mA Charge Timer, LED Blinking Cycle, Delay Time Setting
Quick Timer Setting
Charge ON/OFF Control
Batteries Thermal (High Temperature) Setting
Batteries Thermal (Low Temperature) Setting
Battery Temperature Detection, Battery Connected Detection
Operating Voltage
Reference Voltage Output
Battery Voltage Detection
Charge Current Detection 2
Charge Current Detection 1
Quick Charge Current Setting
■CHARGE VOLTAGE / CURRENT for RESISTANCE SETTING
Parameter
Calculation formula
Charge Control Voltage
Low Voltage Detection Voltage
Quick Charge Start Voltage
Re-Charge Detection Voltage
Over Voltage Detection Voltage
Pre-Charge Current
Quick Charge Current
Full Charge Current
VBAT
=
RB1 + RB2
RB2
x VREF-CV (4.2V)
VBAT x 0.475
VBAT x 0.73
VBAT x 0.95
VBAT x 1.025
IP-CHG =
(
RP2
RP1 + RP2
x
VREF (1.24V)
/
4)
/
RCS
(at. RP1:232kΩ, RP2:16kΩ, RCS=0.2Ω)
IQ-CHG =
(
RQ2
RQ1 + RQ2
x
VREF (1.24V)
/
4)
/
RCS
(at. RQ1:128kΩ, RQ2:120kΩ, RCS=0.2Ω)
IF-CHG =
( RF2
RF1 + RF2
x
VREF (1.24V)
/ 8)
/ RCS
(at. RF1:114.4kΩ, RF2:9.6kΩ, RCS=0.2Ω)
Examples of calculation
4.2V 8.4V
2.00V
3.07V
3.99V
4.305V
3.99V
6.13V
7.98V
8.61V
100mA
750mA
60mA
Ver.2006-12-09
-5-
5 Page 
www.DataSheet4U.com
■FEATURE DESCRIPTION (CONTINUED)
NJW4108
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
Low Voltage Malfunction
Prevention Circuit
CHG-SW
Battery Connected
Detection
Temperature Detection
Full Charge Detection
Re-Charge Detection
Low Voltage Detection
Over Voltage Detection
Quick Charge Detection
Delay I
Delay II
Extra Feature
Hysteresis
Hysteresis
Hysteresis
Hysteresis
–
–
Hysteresis
Latch
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)
4700pF
0.01µF
0.022µF
0.047µF
Oscillation Cycle
(OSC1, OSC2)
t = 4.7ms
t = 10ms
t = 22ms
t = 47ms
Table 3 Timer Time
Block Name
Pre-Charge Timer
Quick Charge Timer
Parameter
2mA Charge Timer
Pre-Charge Timer
LED R Blinking Cycle
(Time out, Over voltage)
LED G Blinking Cycle
(Abnormal temperature)
Delay I
Delay II
Quick Charge Timer
Calculation
Formula
tx210
tx217
tx27
tx28
tx25
tx24
tx220
Examples
10.2s
22min.
1.28s
2.56s
0.32s
0.16s
2hours 55 min.
C1=0.01µF
C2=0.01µF
Use capacitors the have good temperature characteristics in the OSC block.
Capacitor deviation will cause timer errors.
Ver.2006-12-09
- 11 -
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NJW4108.PDF ] | |
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