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PDF RT9502 Data sheet ( Hoja de datos )
| Número de pieza | RT9502 | |
| Descripción | Linear Single Cell Li-Ion Battery Charger IC | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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RT9502
Linear Single Cell Li-Ion Battery Charger IC with
Dual Input Supply
General Description
The RT9502 is a fully integrated low cost single-cell Li-
Ion battery charger IC ideal for portable applications. The
RT9502 is capable of being powered up from AC adapter
and USB (Universal Serial Bus) port inputs. The RT9502
can automatically detect and select the AC adapter and
the USB port as the power source for the charger. The
RT9502 enters sleep mode when both supplies are
removed.
The RT9502 optimizes the charging task by using a control
algorithm including precondition mode, fast charge mode
and constant voltage mode. The charging task is
terminated as the charge current drops below the preset
threshold. The USB charge current can be selected from
preset ratings of 100mA and 500mA, while 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 RT9502 features 18V and 7V maximum rating voltages
for AC adapter and USB port inputs respectively. The other
features are under voltage protection, over voltage
protection for AC adapter supply and battery temperature
monitoring.
Features
z Automatic Input Supplies Selection
z 18V Maximum Rating for AC Adapter
z Integrated Selectable 100mA and 500mA USB
Charge Current
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 100% Lead (Pb)-Free
Applications
z Digital Cameras
z Cellular Phones
z Personal Digital Assistants (PDAs)
z MP3 Players
z Hand Held PCs
Pin Configurations
Ordering Information
RT9502
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
(TOP VIEW)
ACIN 1
USB 2
CHG_S 3
PGOOD 4
GND 5
GND
11
10 BATT
9 TS
8 EN
7 ISETU
ISETA
WDFN-10L 3x3
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
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9502-02 April 2011
www.richtek.com
1
1 page  
RT9502
Absolute Maximum Ratings (Note 1)
z ACIN Input Voltage -------------------------------------------------------------------------------------------------------- −0.3V to 18V
z USB Input Voltage --------------------------------------------------------------------------------------------------------- −0.3V to 7V
z EN Input Voltage ----------------------------------------------------------------------------------------------------------- −0.3V to 6V
z Output Current ------------------------------------------------------------------------------------------------------------- 1.2A
z Power Dissipation, PD @ TA = 25°C
WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------------- 0.926W
z Package Thermal Resistance (Note 2)
WDFN-10L 3x3, θJA ------------------------------------------------------------------------------------------------------- 108°C/W
WDFN-10L 3x3, θJC ------------------------------------------------------------------------------------------------------- 8.2°C/W
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
z Junction Temperature ---------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
z ACIN, USB Input Voltage Range --------------------------------------------------------------------------------------- 4.5V to 6V
z Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(ACIN = USB = 5V, TA = 27°C, Unless Otherwise specification)
Parameter
Symbol
Test Conditions
Supply Input
ACIN/USB UVP Rising Threshold
Voltage
ACIN/USB UVP Hysteresis
ACIN/USB Standby Current
ACIN/USB Shutdown Current
ACIN/USB UVP Current
VUV_HIGH
VUV_LOW
ISTBY
ISHD N
IUVP
BATT Sleep Leakage Current
Voltage Regulation
ISLEEP
VBATT = 4.5V
VEN = High
VACIN = 4V, VUSB = 4V,
VBATT = 3V
VACIN = 4V, VUSB = 4V
VBATT = 4.5V
BATT Regulation Voltage
Regulation Voltage Accuracy
ACIN MOSFET
USB MOSFET
VREG
IBATT = 60mA
RDS(ON)_ACI
N
RDS (ON)_U SB
IBATT = 500mA
IBATT = 500mA
Current Regulation
ISETA Set Voltage
(Fast Charge Phase)
Full Charge setting range
VISETA
ICHG_ACIN
VBATT = 3.5V
DS9502-02 April 2011
Min Typ Max Units
-- 4.4 4.5 V
50 80 120 mV
-- 300 500 uA
-- 50 100 uA
-- 150 250 uA
-- 2 5 uA
4.158
−1
4.2
--
-- 600
-- 1200
4.242
+1
--
--
V
%
mΩ
mΩ
2.42
100
2.5 2.55 V
-- 1200 mA
To be continued
www.richtek.com
5
5 Page 
RT9502
A
ITS
Temperature
Sense
TS
0.1uF to 10uF
VBATT
RT1
RT2
NTC
Battery
VTS
=
ITS
RT2 × (RT1 + RNTC )
RT1 + RT2 + RNTC
Turn off when VTS ≥ 2.5V or VTS ≤ 0.5V
Figure 3. Temperature Sensing Circuit
Fast-Charge Current Setting
Case 1 : ACIN Mode
The RT9502 offers ISETA pin to determine the ACIN charge
rate from 100mA to 1.2A. The charge current can be
calculated as following equation.
Icharge_ac
= KSET
VSET
RSETA
The parameter KSET = 300 ; VSET = 2.5V. RSETA is the
resistor connected between the ISETA and GND.
1200
1000
800
600
400
200
0
0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5
RRSSEETTAA(k(kΩ) )
Case 2 : USB Mode
When charging from a USB port, the ISETU pin can be
used to determine the charge current of 100mA or 500mA.
A low-level signal of ISETU pin sets the charge current at
100mA and a high level signal sets the charge current at
500mA.
Pre- Charge Current Setting
During a charge cycle if the battery voltage is below the
VPRECH threshold, the RT9502 applies a pre-charge
mode to the battery. This feature revives deeply discharged
cells and protects battery life. The RT9502 internal
determines the pre-charge rate as 10% of the fast-charge
current.
Battery Voltage Regulation
The RT9502 monitors the battery voltage through the BATT
pin. Once the battery voltage level closes to the VREG
threshold, the RT9502 voltage enters constant phase and
the charging current begins to taper down. When battery
voltage is over the VREG threshold, the RT9502 will stop
charge and keep to monitor the battery voltage. However,
when the battery voltage decreases 100mV below the
VREG, it will be recharged to keep the battery voltage.
Charge Status Outputs
The open-drain CHG_S and PGOOD outputs indicate
various charger operations as shown in the following table.
These status pins can be used to drive LEDs or
communicate to the host processor. Note that ON
indicates the open-drain transistor is turned on and LED
is bright.
Charge State
ACIN
Charge
Charge done
USB
Charge
Charge done
CHG_S
ON
OFF
ON
OFF
PGOOD
ON
ON
OFF
OFF
Figure 4. ACIN Mode Charge Current Setting
DS9502-02 April 2011
www.richtek.com
11
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT9502.PDF ] | |
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