RT9515 Datasheet PDF - Richtek Technology

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RT9515
Richtek Technology

Part Number RT9515
Description Linear Single Cell Li-Ion Battery Charger IC
Page 11 Pages


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RT9515
Linear Single Cell Li-Ion Battery Charger IC
General Description
The RT9515 is a fully integrated low cost single-cell Li-
Ion battery charger IC ideal for portable applications. The
RT9515 is capable of being powered up from AC adapter.
The RT9515 enters sleep mode when AC adapter is
removed.
The RT9515 optimizes the charging task by using a control
algorithm including preconditioning mode, fast charge
mode and constant voltage mode. The charging task is
terminated as the charge current drops below the preset
threshold. The AC adapter charge current can be
programmed up to 1A with an external resister. The internal
thermal feedback circuitry regulates the die temperature
to optimize the charge rate for all ambient temperatures.
The RT9515 features 18V maximum rating voltages for
AC adapter. The other features are under voltage
protection, over voltage protection for AC adapter supply
and battery temperature monitoring.
Features
z 18V Maximum Rating for AC Adapter
z Internal Integrated P-MOSFETs
z AC Adapter Power Good Status Indicator
z Charge Status Indicator
z Under Voltage Protection
z Over Voltage Protection
z Automatic Recharge Feature
z Battery Temperature Monitoring
z Small 10-Lead WDFN Package
z Thermal Feedback Optimizing Charge Rate
z RoHS Compliant and Halogen Free
Applications
z Digital Cameras
z Cellular Phones
z Personal Data Assistants (PDAs)
z MP3 Players
z Handheld PCs
Ordering Information
RT9515
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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.
Pin Configurations
(TOP VIEW)
ACIN 1
NC 2
CHG_S 3
PGOOD 4
GND 5
GND
11
10 BATT
9 TS
8 EN
7 NC
ISETA
WDFN-10L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9515-01 April 2011
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RT9515
Typical Application Circuit
AC
Adapter
RT9515
1 ACIN
10
BATT
1uF
Battery Pack
To System
To System
3 CHG_S
4 PGOOD
5, Exposed Pad (11)
GND
9
TS
8
EN
ISETA 6
Chip Shutdown
Chip Enable
RSET
0.1uF to 10uF
Pre-Charge Phase
Fast Charge
Phase
Constant Voltage
Phase &
Re-Charge Phase
Standby Phase
Programmed
Charge Current
Battery
Voltage
4.1V Recharge
Threshold
Charging
Current
1/10 Programmed
Charge Current
2.8V Precharge
Threshold
Charge
Complete
Functional Pin Description
Pin No.
1
2, 7
3
4
5
Pin Name
ACIN
NC
CHG_S
PGOOD
GND
Pin Function
Wall Adaptor Charge Input Supply.
No Internal Connection.
Charge Status Indicator Output (open drain).
Power Good Indicator Output (open drain).
Ground.
6
ISETA
Wall Adaptor Supply Charge Current Set Point.
8 EN
9 TS
10 BATT
11 (Exposed Pad) GND
Charge Enable Input (active low).
Temperature Sense Input.
Battery Charge Current Output.
Exposed pad should be soldered to PCB board and connected to GND.
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DS9515-01 April 2011



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Function Block Diagram
GND
Charge Input Control
RT9515
ACIN
OVP
Comparator
2.5V
+
-
OVP
SENSE
FET
ACIN
PFET
ISETA
2.5V
0.5V
0.25V
VREF
BATT
Precharge
Comparator
+
2.5V -
Precharge
Recharge
Comparator
+
2.5V -
Recharge
Loop Controller
Tcrmination
Comparator
-
VREF
0.25V +
0.9V -
Charge
Disable
+
125 C
Charge Done
Temperature Fault
Temperature
1uA Sense
VCC
Logic
PGOOD
CHG_S
EN TS
DS9515-01 April 2011
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RT9515
Operation State Diagram for Charger function (RT9515)
UVLO <VIN < OVP
& EN = Low
& VIN > BATT
NO
Power Off State
PFET = OFF
Any State
if VIN < UVLO or
VIN > OVP or
EN = High or
VIN < BATT
VTS > 2.5V or
VTS < 0.5V
YES
BATT < 4.1V
NO
YES
BATT > 2.8V YES
Fast-CHG State
ICHG_F = 500mA
@RSET = 1.5kΩ
NO
Pre-CHG State
IPCHG
= 0.1 x ICHG_F
ICHG < 0.1 x
ICHG_F
NO
YES
Charge Done State
ICHG = 0A
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DS9515-01 April 2011



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