Battery Charger. RT9526A Datasheet

RT9526A Charger. Datasheet pdf. Equivalent

RT9526A Datasheet
Recommendation RT9526A Datasheet
Part RT9526A
Description Linear Single Cell Li-Ion Battery Charger
Feature RT9526A; ® RT9526A Linear Single Cell Li-Ion Battery Charger with Input Over Voltage Protection General De.
Manufacture Richtek Technology
Datasheet
Download RT9526A Datasheet




Richtek Technology RT9526A
®
RT9526A
Linear Single Cell Li-Ion Battery Charger with Input Over
Voltage Protection
General Description
The RT9526A is a fully integrated low cost single cell Li-
ion battery charger ideal for portable applications. The
RT9526A is capable of being powered up from AC adapter
and USB (Universal Serial Bus) port inputs. The RT9526A
enters sleep mode when supplies are removed. The
RT9526A optimizes the charging task by using a control
algorithm including preconditioning mode, fast charge
mode, and constant voltage mode. The charging task will
remain in constant voltage mode to hold the battery in a
full charge condition. The charge current can be
programmed with an external resistor. The internal thermal
feedback circuitry regulates the die temperature to optimize
the charge rate under all ambient temperatures. The
RT9526A features 28V maximum rating voltage for VIN.
Under-voltage protection and over-voltage protection are
provided for the AC adapter supply.
The RT9526A is available in the WDFN-8L 2x3 and
SOT-23-6 package to achieve best solution for PCB space
and total BOM cost saving considerations.
Applications
Cellular Phones
Digital Cameras
PDAs and Smart Phones
Portable Instruments
Features
28V Maximum Rating for AC Adapter with Over-
Voltage Protection 7V
Internal Integrated Power FETs
AC Adapter Power Good Status Indicator
Programmed Charging Current
Charge Status Indicator
Programmed End of Charge Current
Under-Voltage Protection
Thermal Feedback Optimizing Charge Rate
RoHS Compliant and Halogen Free
Ordering Information
RT9526A
Package Type
QW : WDFN-8L 2x3 (W-Type)
E : SOT-23-6
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
Adapter or USB
CIN
RISET
RIMIN
VIN BATT
RT9526A
ISET
IMIN
GND
ENB
PGB
CHG_SB
COUT
R1
R2
VBATT
VBATT
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9526A-03 July 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek Technology RT9526A
RT9526A
Marking Information
RT9526AGQW
05 : Product Code
05W
W : Date Code
RT9526AGE
0X=DNN
0X= : Product Code
DNN : Date Code
Pin Configurations
(TOP VIEW)
VIN 1
PGB 2
CHG_SB 3
ENB 4
8 BATT
7 ISET
6 IMIN
9 5 GND
WDFN-8L 2x3
IMIN ISET BATT
654
23
CHG_SB GND VIN
SOT-23-6
Function Pin Description
Pin No.
Pin Name
WDFN-8L 2x3 SOT-23-6
Pin Function
1
3 VIN
Supply Voltage Input. VIN can withstand up to 28V input.
2 --
31
4
5,
9 (Exposed Pad)
--
2
PGB
CHG_SB
ENB
GND
Power Good Indicator. This pin connects to VIN with 10SL N-MOSFET
as power good condition.
Charge Status Indicator Output (Open-Drain). Indicate low when
battery is charging; indicate high when battery charging finished or any
fault happened.
Enable Control Input (Active Low). Connect this pin with a 200k
pull-low resistor.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
6
6 IMIN
EOC Current Setting.
7
5 ISET
Charge Current Set Point.
8
4 BATT
Battery Charge Current Output.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9526A-03 July 2014



Richtek Technology RT9526A
Function Block Diagram
VIN
ISET
Switch
Well
BASE
VREF
IBIAS
Sleep
Mode
Current
Set Block
CC/CV/TR
Multi Loop
Controller
ENB
OVP
UVLO
200k
Logic
RT9526A
BATT
EOC Set
Block
IMIN
CHG_SB
PGB
GND
Operation
The RT9526A is a fully integrated low cost single cell Li-
ion charger. It provides a fast-charge current setting by
resistor RIREF. Pre-charge is 16.7% of fast charge current,
while VBAT < 2.45V. The PGB pin is low, while VIN >
POR, VIN < OVP, and VIN VBAT > VOSH_H. The CHG_SB
pin is low, while RT9526A is charging. The CHG_SB pin
will go high while end of charger happens. End of charge
condition is set by RIMIN. CHG_SB will go low again, while
charge current is larger than 75% of fast-charge setting.
The RT9526A charges continuously after end of charge
happens. Li-ion battery will be full charged until CV = 4.2V.
The RT9526A can be disabled by ENB = H.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9526A-03 July 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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