Battery Charger. RT9531 Datasheet

RT9531 Charger. Datasheet pdf. Equivalent

RT9531 Datasheet
Recommendation RT9531 Datasheet
Part RT9531
Description High Efficiency Switching Mode Battery Charger
Feature RT9531; ® RT9531 High Efficiency Switching Mode Battery Charger General Description The RT9531 is a PWM sw.
Manufacture Richtek
Datasheet
Download RT9531 Datasheet




Richtek RT9531
® RT9531
High Efficiency Switching Mode Battery Charger
General Description
The RT9531 is a PWM switch mode battery charger
controller to fast charge single or multiple Li-Ion, NiMH
and NiCd batteries, using constant current or constant
voltage control. Maximum current can be easily adjusted
by external resistor. The constant voltage output can
support up to 4 Li-Ion cells with 0.5% accuracy.
A third control loop limits the input current drawing from
the adapter during charging. This allows simultaneous
operation of the equipment and fast battery charging
without over loading to the adapter.
The RT9531 can charge batteries from 2.5V to 4.2V with
dropout voltage as low as 0.4V. A diode is not required in
series with the battery because the charger automatically
enters a 10μA sleep mode when the adapter is unplugged.
A logic output indicates Li-Ion full charge when current
drops to 20% of the full-scale adjusted charge current.
Marking Information
1X=YM
DNN
1X= : Product Code
YMDNN : Date Code
Features
Fast Charging for Li-Ion, NiMH and NiCd Batteries
Preset Battery Voltages : 4.2V
High Efficiency : Up to 95%
Precision 0.5% Charging Voltage Accuracy
5% Charging Current Accuracy
Charging Current Adjusted by Resistor
0.4V Dropout Voltage
Input Current Limit Maximizes Charging Rate
475kHz Switching Frequency
Flag Indicates Li-Ion Charge Completion
Auto Shutdown with Adapter Removal
Only 10μA Battery Drain When Idle
Available in an WQFN-16L 4x4 Package
RoHS Compliant and Halogen Free
Applications
Notebook Computers
Portable Instruments
Chargers for Li-Ion, NiMH, NiCd and Lead Acid
Rechargeable Batteries
Simplified Application Circuit
VIN
CIN
M1
R1
RS4
C1 R2
C2 RT9531
ACN
V5V
ACP
ACDRV BOOT
R3
(Option)
C3
(Option)
R4 R5
C4
VHH
C5
(Option)
EN
VIN
ISET
VC
VHH
TG
SW
STATUS
SNSH
SNSL
C6
GND BATT
To System Power
C7
R7
R6
C9
D2 D3
To VHH Pin
M2 C8
L1 RS1
D1 RS3 RS2
VBATT
CBATT
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS9531-02 July 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek RT9531
RT9531
Ordering Information
RT9531-
Package Type
QW : WQFN-16L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Preset Battery Voltage
A : 1-Cell (4.2V)
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)
16 15 14 13
ACN 1
12 BOOT
ACP 2
ISET 3
VC 4
GND
17
11 TG
10 SW
9 STATUS
56 78
WQFN-16L 4x4
Function Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
ACN
ACP
ISET
VC
VHH
BATT
SNSL
SNSH
STATUS
SW
TG
BOOT
V5V
VIN
Pin Function
Negative Terminal to Sense Input Current. A 0.1F ceramic capacitor is placed
from ACN to ACP to provide differential-mode filtering to the switching noise.
Positive Terminal to Sense Input Current.
Charge Current Setting and System Loop Compensation Pin. Connect a
resistor from this pin to ground to set the charge current. A capacitor of at least
0.1F to GND filters out the current ripple.
Control Signal of the Inner Loop of the Current Mode PWM. It provides loop
compensation and soft-start.
To Supply the Current Sense Amplifier CA for Very Low Dropout Condition. It
must be connected as shown in the typical application circuit or connected to
VIN, if VIN is always larger than BATT by at least 1.8V.
Battery Voltage Sense Input. A 10F or larger X5R ceramic capacitor is
recommended for filtering charge current ripple and stability purpose.
Negative Terminal for Sensing Charge Current.
Positive Terminal for Sensing Charge Current.
Flag to Indicate Charge Completion. It turns to logic high when the charge
current drops blew 20% of the setting charge current. A 0.1F capacitor from
STATUS to ground is needed to filter the sampled charge current ripple.
Switch Node. This pin switches between ground and VIN with high dv/dt rates.
Care needs to be taken in the PCB layout to keep this node from coupling to
other sensitive nodes.
Gate Driver Output for the External N-MOSFET.
Bootstrap for High Side Gate Driver. In normal operation, VBOOT VSW + 5V.
Output of Internal 5V LDO. Connect a 1F ceramic capacitor from this pin to
GND for stability.
Input Power Supply. Connect a low ESR capacitor of 10F or higher from this
pin to ground for good bypass.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9531-02 July 2016



Richtek RT9531
RT9531
Pin No.
15
16
17
(Exposed Pad)
Pin Name
EN
ACDRV
GND
Pin Function
Enable Control Input, Active High. It must be connected to a logic voltage or
pulled up to VIN with a 100kresistor.
Gate Driver Output for Input P-MOSFET
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Function Block Diagram
ACDRV
VIN
EN
VHH
SNSH
SNSL
BATT
ACP
ACN
R1
200k
5V
1.4V
-
C3
+
0.5µA
VIN
BATT
0.4V
+C2
-
ACN
5V
Reference
Shutdown
UVLO
ICHG
DRIVER
+
- 3.8V
SLOPE
COMP
Oscillator
VIN
LDO
VREF
2.5V
IVA
4
ICHG
RFB1
RFB2
+CA
-
VREF
2.5V
+VA
-
ICHG
IVA
VREF
2.5V
R2
-EA
+
100mV
ICL
-
CL
+
PWM
+C1
-
S
R
+
- 1.3V
Counter
V5V
STATUS
BOOT
TG
SW
ISET
VC
GND
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS9531-02 July 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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