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RT9502 데이터시트(PDF) 11 Page - Richtek Technology Corporation

부품명 RT9502
상세설명  Linear Single Cell Li-Ion Battery Charger IC with Dual Input Supply
PDF  13 Pages
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제조업체  RICHTEK [Richtek Technology Corporation]
홈페이지  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9502 데이터시트(HTML) 11 Page - Richtek Technology Corporation

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RT9502
11
DS9502-02 April 2011
www.richtek.com
Figure 3. Temperature Sensing Circuit
T2
T1
NTC
TS
TS
T1
T2
NTC
TS
TS
R(R
+ R
)
V
= I
R
+ R
+ R
Turn off when V
2.5V or V
0.5V
×
≥≤
RT2
Battery
A
TS
Temperature
Sense
ITS
VBATT
NTC
RT1
0.1uF to 10uF
SET
charge_ac
SET
SETA
V
I
= K
R
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.
The parameter KSET = 300 ; VSET = 2.5V. RSETA is the
resistor connected between the ISETA and GND.
Figure 4. ACIN Mode Charge Current Setting
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
CHG_S
PGOOD
Charge
ON
ON
ACIN
Charge done
OFF
ON
Charge
ON
OFF
USB
Charge done
OFF
OFF
0
200
400
600
800
1000
1200
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
8.5
9.5
RSETA (k)
RSETA (k
Ω)



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