RT9524
Linear Single Cell Li-Ion Battery Charger IC for Portable
Applications
General Description
The RT9524 is a fully integrated single cell Li-ion battery
charger IC ideal for portable applications. The RT9524
optimizes the charging task by using a control algorithm
including pre-charge mode, fast charge mode and constant
voltage mode. the input voltage range of the VIN pin can
be as high as 28V. When the input voltage exceeds
the OVP threshold, it will turn off the charging MOSFET
to avoid overheating of the chip.
In RT9524, the maximum charging current can be
programmed with an external resistor. For USB application,
the user can set the current to 100mA/500mA through
the EN/SET pin. For the factory mode, the RT9524 can
allow 4.2V/2.3A power pass through to support system
operation. It also provides a 50mA LDO to support the
power of peripheral circuit. The internal thermal feedback
circuit regulates the die temperature to optimize the
charge rate for all ambient temperatures. The RT9524
provides protection functions such as under voltage
protection, over voltage protection for VIN supply and
thermal protection for battery temperature.
The RT9524 is available in a WDFN-10L 3x2 package to
achieve optimized solution for PCB space and thermal
considerations.
Features
28V Maximum Rating for DC Adapter
Internal Integrated Power MOSFETs
Support 4.2V/2.3A Factory Mode
50mA Low Dropout Voltage Regulator
Status Pin Indicator
Programmed Charging Current
Under Voltage Lockout
Over Voltage Protection
Thermal Feedback Optimized Charge Rate
RoHS Compliant and Halogen Free
Applications
Cellular Phones
Digital Cameras
PDAs and Smart Phones
Protable Instruments
Pin Configurations
(TOP VIEW)
VIN
ISET
GND
LDO
IEOC
1
2
3
4
5
10
9
8
7
6
11
BATT
PGB
CHGSB
GND
EN/SET
WDFN-10L 3x2
Ordering Information
RT9524
Package Type
QW : WDFN-10L 3x2 (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.
Marking Information
A0 : Product Code
A0W
W : Date Code
DS9524-01 April 2011
GND
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1
RT9524
Typical Application Circuit
RT9524
Adapter or USB
C
IN
BATT
9
2
R
ISET
R
IEOC
5
PGB
ISET
IEOC
CHGSB 8
1 VIN
BATT 10
C
OUT
+
BATT
LDO 4
EN/SET 6
3, 7, 11(Exposed Pad)
GND
Functional Pin Description
Pin No.
1
2
Pin Name
VIN
ISET
The Input Power Source.
Charging Current Setting.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
LDO Output (4.9V). This pin provides 50mA output current.
End-of-Charge Current Setting. The I
EOC
is from 5% to 5O% Ichg-fast which is
programmed by the ISET pin.
Enable and Operation Mode Setting.
Indicator Output for Charging Status.
Indicator Output for Power Status.
Battery Charge Current Output.
Pin Function
3, 7,
GND
11 (Exposed Pad)
4
5
6
8
9
10
LDO
IEOC
EN/SET
CHGSB
PGB
BATT
Function Block Diagram
Switch
Well
VIN
Base
V
REF
V
DD
I
Bias
BATT
CHGSB
PGB
Status
Sleep
Mode
IEOC
I
EOC
Set
Block
CC/CV/TR
Multi Loop
Controller
Current
Set Block
Current
Set Block
200k
OVP
UVLO
Logic
LDO
GND
ISET
EN/SET
LDO
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2
DS9524-01 April 2011
RT9524
Absolute Maximum Ratings
(Note 1)
−0.3V
to 28V
−0.3V
to 6V
1.111W
90°C/W
15°C/W
Supply Input Voltage, V
IN
----------------------------------------------------------------------------------------------
Other Pins -----------------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WDFN-10L 3x2 -----------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
WDFN-10L 3x2,
θ
JA
------------------------------------------------------------------------------------------------------
WDFN-10L 3x2,
θ
JC
-----------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260°C
Junction Temperature --------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------------
−
65°C to 150°C
Recommended Operating Conditions
(Note 3)
Supply Input Voltage, V
IN
---------------------------------------------------------------------------------------------- 4.3V to 5.5V
Junction Temperature Range ------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------
−20°C
to 85°C
Electrical Characteristics
(V
IN
= 5V, V
BATT
= 4V, T
A
= 25°C, unless otherwise specified)
Parameter
VIN POR Rising Threshold
Voltage
VIN POR Threshold Voltage
Hysteresis
VIN OVP Threshold Voltage
VIN OVP Threshold Voltage
Hysteresis
VIN
−
VOUT VOS Rising
VIN
−
VOUT VOS Falling
VIN Standby Current
VIN Supply Current
VOUT Sleep Leakage
Current
VOUT Regulation
Thermal Regulation
OTP
OTP Hysteresis
PGB/CHGSB Sink Current
Pre-Charge Threshold
Fast-Charge to Pre-Charge
Deglitch Time
Pre-Charge Current
End of Charge Current (EOC)
Symbol
V
POR
Test Conditions
Min
3.15
--
Typ
3.3
200
6.9
200
75
32
250
1
1
4.2
125
155
20
--
2.5
25
95
20
R
EOC
/K
EOC
Max
3.45
300
7.1
300
150
--
300
2
10
4.242
--
--
--
--
2.6
--
100
25
--
Unit
V
mV
V
mV
mV
mV
μA
mA
μA
V
°C
°C
°C
mA
V
ms
mA
%
%
V
OVP
6.7
--
--
18
V
BATT
= 4.5V, EN/SET = High
V
BATT
= 4.5V, EN/SET = Low
--
--
--
0°C to 85°C, I
LOAD
= 0mA
4.158
--
--
--
20
V
OUT
Rising
2.4
--
I
PRECHG
USB100 Mode
USB500 Mode or ISET Mode,
ratio of fast-charge current
90
15
--
To be continued
DS9524-01 April 2011
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3
RT9524
Parameter
IEOC Setting Current
IEOC Setting K
EOC
VIN Power FET R
DS(ON)
ISET Set Voltage
ISET Short Protect Threshold
ISET Short Protect Deglitch
Time
ISET Short Protect Maximum
Current
VIN Charge Current
EN/SET Pull Low Resistor
EN/SET
Voltage
Logic-High
Logic-Low
V
IH
V
IL
R
DS(ON)
V
LDO
4.75
60
4.116
2.3
Timer to disable chip
Timer to lock pulse count
1.5
1.5
100
100
I
CHRG
As ISET Mode, R
ISET
= 530
As USB100 Mode
As USB500 Mode
V
ISET
Symbol
I
EOC
I
OUT
= 1A
Test Conditions
Min
70
180
--
--
320
--
--
0.9
90
380
--
1.4
--
Typ
75
200
280
1.5
--
1.5
2
1
95
395
200
--
--
3
4.9
120
4.2
--
--
--
--
--
Max
80
220
512
--
460
--
--
1.1
100
415
--
--
0.4
6
5.05
180
4.284
--
--
--
700
700
Unit
μA
Ω/%
mV
V
Ω
ms
A
A
mA
mA
kΩ
V
Ω
V
mA
V
A
ms
ms
μs
μs
LDO On-Resistance
LDO Output Voltage
LDO Maximum Output
Current
Factory Mode V
OUT
Factory Mode Maximum
Output Current
EN/SET Off Time
EN/SET Lock Time
EN/SET
Logic-High Duration
Logic-Low Duration
Note 1.
Stresses listed as the above
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a high effective thermal conductivity four-layer test board of
JEDEC 51-7 thermal measurement standard. The measurement case position of
θ
JC
is on the exposed pad of the
package.
Note 3.
The device is not guaranteed to function outside its operating conditions.
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DS9524-01 April 2011
RT9524
Typical Operating Characteristics
VOUT Regulation Voltage vs. Input Voltage
4.225
4.220
4.215
4.210
4.205
4.200
4.195
4.5
4.94
5.38
5.82
6.26
6.7
4.215
VOUT Regulation Voltage vs. Temperature
VOUT Regulation Voltage (V)1
VOUT Regulation Voltage (V)
4.210
4.205
4.200
4.195
4.190
V
IN
= 5V
4.185
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (°C)
Input OVP Threshold vs. Temperature
6.84
6.82
6.80
6.78
6.76
6.74
6.72
6.70
-50
-25
0
25
50
75
100
125
VOUT Sleep Leakage Current vs. Battery Voltage
VOUT Sleep Leakage Current (µA)1
20
Input OVP Threshold (V)
16
12
8
4
0
1.3
1.7
2.1
2.5
2.9
3.3
3.7
4.1
4.5
Temperature (°C)
Battery Voltage (V)
LDO Output Voltage vs. Output Current
4.95
LDO Voltage vs. Temperature
4.95
LDO Output Voltage (V)
4.93
4.93
LDO Voltage (V)
4.91
4.91
4.89
4.89
4.87
4.87
V
IN
= 5.5V
4.85
0
20
40
60
80
100
V
IN
= 5.5V, I
LDO
= 50mA
4.85
-50
-25
0
25
50
75
100
125
Output Current (mA)
Temperature (°C)
DS9524-01 April 2011
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