NJW4120 Datasheet PDF - JRC
| Part Number | NJW4120 | |
| Description | Lithium-Battery Charger Controller IC with Timer / DMP20 / SSOP20 | |
| Manufacturers | JRC | |
| Logo |  |
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NJW4120
Lithium-ion Battery Charger Controller IC with Timer
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
NJW4120 is a 1-cell and 2-cell lithium ion battery charge control IC
with a built-in AC-DC secondary side control feature. Using a
photocoupler to directly feed back optimum charging voltage and
current information to the primary side, it increases energy
efficiency, makes possible a smaller charger, and conserves
energy. Charging current can be freely set and therefore it is
possible to optimize charging according to battery capacity.
NJW4120M
As safety features it has over voltage, over discharge, temperature
detection, and a charge over timer. Also, the adaptor and the
charge control circuit are mounted on one chip.
■FEATURES
● Charge Control Feedback by Photocoupler
● 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
NJW4120M : DMP20
NJW4120V : SSOP20
■PIN CONFIGURATION
P-CHG 1
NFB
TX-SW
2
3
GND
4
PC 5
ADP
LED-G
LED-R
6
7
8
C1 9
C2 10
NJW4120M
NJW4120V
20 Q-CHG
19 CS1
18 CS2
17 VS
16 VREF
15 V+
14 TDET
13 TH
12 TL
11 CHG-SW
NJW4120V
Ver.2006-01-18
-1-
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NJW4120
■PIN CONFIGULATION
Pin No.
Pin Name
1 P-CHG
2 NFB
3 TX-SW
4 GND
5 PC
6 ADP
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
Function
Pre-Charge Current Setting
Current-Regulation-Loop Compensation
Switch Transistor connection
GND
Photocoupler connection for the first side feedback
Adaptor Control Voltage 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
Adaptor Output Voltage
VADP
=
RA1 + RA2
RA 2
x
VREF-ADP (1.24V)
Charge Control Voltage
VBAT
=
RB1 + RB2
RB2
x
VREF-CV (2.1V)
Low Voltage Detection
Voltage
VBAT x 0.525
Quick Charge Start Voltage
Re-Charge Detection Voltage
Over Voltage Detection
Voltage
VBAT x 0.73
VBAT x 0.95
VBAT x 1.025
Pre-Charge Current
Quick Charge Current
Full Charge Current
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 = (96mV / 8) / RCS
(at. RCS=0.2Ω)
Examples of calculation
5.0V 10V
4.2V 8.4V
2.21V
3.07 V
3.99 V
4.305 V
4.41V
6.13 V
7.98 V
8.61 V
100mA
750mA
60mA
Ver.2006-01-18
-5-
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for NJW4120 electronic component. |
| Information | Total 20 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ NJW4120.PDF Datasheet ] | |
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