RT9519A
Linear Single Cell Li-lon Battery Charger with Auto Power
Path Management
General Description
The RT9519A is an integrated single cell Li-ion battery
charger with Auto Power Path Management (APPM). No
external MOSFETs are required. The RT9519A enters
sleep mode when power is removed. Charging tasks are
optimized by using a control algorithm to vary the charge
rate, including pre-charge mode, fast charge mode and
constant voltage mode. For the RT9519A, the charge
current can also be programmed with an external resistor
and modified with an external GPIO. The scope that the
battery regulation voltage can be modified with an external
GPIO depends on the battery temperature. The internal
thermal feedback circuitry regulates the die temperature
to optimize the charge rate for all ambient temperatures.
The charging task will always be terminated in constant
voltage mode when the charging current reduces to the
termination current of 10% x I
CHG_FAST
. Other features
include under voltage protection and over voltage protection
for VIN the supply.
Features
28V Maximum Rating for VIN Power
Selectable Power Current Limit (0.1A / 0.5A / 1.5A)
Integrated Power MOSFETs
Auto Power Path Management (APPM)
Battery Charging Current Control
Battery Regulation Voltage Control
Programmable Charging Current and Safe Charge
Timer
Under Voltage Protection, Over Voltage Protection
Power Good and Charge Status Indicator
Optimized Charge Rate via Thermal Feedback
Thin 20-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
Digital Cameras
PDAs and Smart Phones
Portable Instruments
Ordering Information
RT9519A
Package Type
QW : WQFN-20L 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)
USUS
SYS
SYS
SYS
NC
20 19 18 17 16
VIN
PGOOD
CHG
GND
ISETA
1
2
3
4
5
6
7
8
9 10
15
14
GND
21
13
12
11
VSET
ISETL
ISETU
VP
ISET
Marking Information
JF= : Product Code
WQFN-20L 3x3
JF=YM
DNN
YMDNN : Date Code
DS9519A-02 April 2011
TS
TIMER
BAT
BAT
EN
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1
RT9519A
Typical Application Circuit
RT9519A
Adapter
C
IN
2.2µF
1 VIN
17, 18, 19
VP 12
6
7
C
TIMER
1µF
NTC
External Power Source
2.95V to 3.6V
To System Load
SYS
TS
TIMER
Power Good Indicator
Charge Indicator
Chip Enable
Suspend
Normal
Suspend Mode
4.05V
See ISETU
1.5A
VIN Current Limit
500mA
100mA
VIN Current Limit
4.2V
2 PGOOD
3
CHG
10 EN
20 USUS
15 VSET
14
ISETL
BAT 8, 9
1µF
+
1-Cell
Li+
ISETA 5
ISET 11
R
ISETA
I
CHG
I
CHG
/2
13 ISETU
GND
4, 21 (Exposed Pad)
Function Block Diagram
VIN
SYS
Control
Circuit
Thermal
Circuit
Sleep
Mode
Current
Setting
CC/CV/TR
/APPM
Multi Loop
Controller
VP
R
BAT
ISETA
ISET
VSET
200k
200k
Timer
Temperature
Sense
Logic Control
PGOOD
TIMER
ISETL
USUS
EN
ISETU
200k
200k
200k
200k
TS
CHG
1sec
Delay
GND
OVP
UVLO
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2
DS9519A-02 April 2011
RT9519A
Functional Pin Description
Pin No.
1
2
3
Pin Name
VIN
PGOOD
CHG
Supply Voltage Input.
Power Good Status Output. Open-drain output.
Charger Status Output. Open-drain output.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Charge Current Set Input. Connect a resistor (R
ISETA
) between ISETA and GND.
Temperature Sense Input. The TS pin connects to a battery’s thermistor to
determine if the battery is too hot or too cold to charge. If the battery’s
temperature is out of range, charging is paused until it re-enters the valid range.
TS also detect battery (with NTC) is present or not.
Safe Charge Timer Setting.
Battery Charge Current Output.
Charge Enable. Active Low input. 200kΩ pull low.
Half Charge Current Set Input. Control by external GPIO, L = I
CHG1
/ 2, H = I
CHG1
,
200kΩ pull low.
This pin must be provided a regulated voltage from 2.95V to 3.6V by external
power.
VIN Current Limit Control Input. When ISETL = H, L = 100mA, H = 500mA,
200kΩ pull low.
VIN Current Limit Control Input. H : see ISETU, L = 1.5A, 200kΩ pull low.
Battery Regulation Set Input. Control by external GPIO. L = 4.05V, H = 4.2V,
200kΩ pull low.
No Internal Connection.
System Connect Pin. Connect this pin to System with a minimum 10μF ceramic
capacitor to GND.
VIN Suspend Control Input. H = Suspend, L = No suspend. 200kΩ pull low.
Pin Function
4,
GND
21 (Exposed Pad)
5
6
ISETA
TS
7
8,9
10
11
12
13
14
15
16
17, 18, 19
20
TIMER
BAT
EN
ISET
VP
ISETU
ISETL
VSET
NC
SYS
USUS
DS9519A-02 April 2011
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3
RT9519A
Absolute Maximum Ratings
(Note 1)
−0.3V
to 28V
−0.3V
to 28V
−0.3V
to 6V
20mA
2.5A
1.471W
Supply Voltage, V
IN
-----------------------------------------------------------------------------------------------------
CHG, PGOOD ------------------------------------------------------------------------------------------------------------
Other Pins -----------------------------------------------------------------------------------------------------------------
CHG, PGOOD Continuous Current ----------------------------------------------------------------------------------
BAT Continuous Current (total in two pins) (Note 2) -----------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WQFN-20L 3x3 -----------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 3)
WQFN-20L 3x3,
θ
JA
----------------------------------------------------------------------------------------------------- 68°C/W
WQFN-20L 3x3,
θ
JC ------------------------------------------------------------------------------------------------------------------------------------------------
7.5°C/W
Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260°C
Junction Temperature --------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 4)
HBM (Human Body Mode) --------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ---------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 5)
4.4V to 6V
4.5V to 6V
−40°C
to 125°C
−40°C
to 85°C
Supply Input Voltage Range,V
IN
(ISETL = L) ----------------------------------------------------------------------
Supply Input Voltage Range,V
IN
(ISETL = H) ----------------------------------------------------------------------
Junction Temperature Range ------------------------------------------------------------------------------------------
Ambient Temperature Range ------------------------------------------------------------------------------------------
Electrical Characteristics
(V
IN
= 5V, V
BAT
= 4V, T
A
= 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Input
VIN Under Voltage Lockout
V
UVLO
Threshold
VIN Under Voltage Lockout
ΔV
UVLO
Hysteresis
VIN Supply Current
VIN Suspend Current
VBAT Sleep Leakage
Current
VIN-BAT VOS Rising
VIN-BAT VOS Falling
Voltage Regulation
System Regulation Voltage V
SYS
Battery Regulation Voltage
Battery Regulation Voltage
APPM Regulation Voltage
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4
V
IN
= 0V to 4V
V
IN
= 4V to 0V
I
SYS
= I
BAT
= 0mA, EN = L (V
BAT
> V
REGx
)
I
SYS
= I
BAT
= 0mA, EN = H (V
BAT
> V
REGx
)
V
IN
= 5V, USUS = H
V
BAT
> V
IN
, (V
IN
= 0V)
3.1
--
--
--
--
--
--
10
3.3
240
1
0.8
195
5
200
50
4.4
4.2
4.05
200
3.5
--
2
1.5
300
15
300
--
4.5
4.23
4.08
V
mV
mA
mA
μA
μA
mV
mV
V
V
V
I
SUPPLY
I
USUS
I
SLEEP
V
OS_H
V
OS_L
V
REG1
V
REG2
ΔV
APPM
I
SYS
= 800mA
0 to 85°C , Loading = 20mA,
When VSET = H
0 to 85°C, Loading = 20mA,
When VSET = L
V
SYS
− ΔV
APPM
4.3
4.16
4.01
120
280
mV
To be continued
DS9519A-02 April 2011
RT9519A
Parameter
DPM Regulation Voltage
VIN to VSYS MOSFET Ron
BAT to VSYS MOSFET Ron
Re-Charge Threshold
Current Regulation
ISETA Set Voltage (Fast Charge
Phase)
Charge Current Setting Range
Charge Current Accuracy1
Charge Current Accuracy2
V
ISETA
I
CHG
I
CHG1
I
CHG2
V
BAT
= 4V, R
ISETA
= 1kΩ
ISET = H
V
BAT
= 3.8V, R
ISETA
= 1kΩ
ISET = L
ISETL = L (1.5A Mode)
ISETL = H, ISETU = H
(500mA mode)
ISETL = H, ISETU = L
(100mA Mode)
Pre-charge
BAT Pre-Charge Threshold
Pre-Charge Current
Charge Termination Detection
Termination Current Ratio to Fast
Charge (Except USB 100 Mode)
Termination Current Ratio to Fast
Charge (USB100 Mode)
Login Input/Output
CHG Pull Down Voltage
PGOOD Pull Down Voltage
EN, ISETL, USUS,
ISETU, VSET, ISET
Threshold Voltage
Protection
Thermal Regulation
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Over Voltage Protection
Over Voltage Protection Hysteresis
Output Short Circuit Detection
Threshold
Time
Pre-Charge Fault Time
Fast charge Fault Time
DS9519A-02 April 2011
Symbol
V
DPM
R
DS(ON)
R
DS(ON)
ΔV
REGCHG
Test Conditions
ISETL = H
I
VIN
= 1000mA
V
BAT
= 4.2V, I
SYS
= 1A
Battery Regulation
−
Recharge
level
Min
4.3
--
--
60
Typ
4.4
0.2
0.05
100
Max
4.5
0.35
0.1
140
Unit
V
Ω
Ω
mV
V
BAT
= 4V, R
ISETA
= 1kΩ
--
100
570
285
1.2
450
90
2
--
600
300
1.5
475
95
--
1200
630
315
1.8
500
100
V
mA
mA
mA
A
mA
mA
VIN Current Limit
I
VIN
V
PRECH
I
CHG_PRE
BAT Falling
V
BAT
= 2V
ISETL = H, ISETU = H
ISETL = L, ISETU = X
ISETL = H, ISETU = L
2.7
--
5
2.8
200
10
2.9
--
15
V
mV
%
BAT Pre-Charge Threshold Hysteresis
Δ
VPRECH
I
TERM
I
TERM2
5
--
10
3.3
15
--
%
%
V
CHG
V
PGOOD
V
IH
V
IL
T
REG
T
SD
ΔT
SD
V
OVP
ΔV
OVP
V
SHORT
t
PCHG
t
FCHG
I
CHG
= 5mA
I
PGOOD
= 5mA
--
--
1.5
--
--
--
--
6.25
--
--
1440
200
200
--
--
125
155
20
6.5
100
300
1800
--
--
--
mV
mV
V
Logic-High
Logic-Low
0.4
--
--
--
6.75
--
--
2160
°C
°C
°C
V
mV
mV
s
V
IN
Rising
V
IN
= 7V to 5V, V
OVP
− ΔV
OVP
V
BAT
−
V
SYS
C
TIMER
= 1μF (1/8 x t
FCHG
)
C
TIMER
= 1μF
11520 14400 17280 s
To be continued
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