Battery Charger. RT9538 Datasheet

RT9538 Charger. Datasheet pdf. Equivalent

RT9538 Datasheet
Recommendation RT9538 Datasheet
Part RT9538
Description High Efficiency Switching Mode Battery Charger
Feature RT9538; ® RT9538 High Efficiency Switching Mode Battery Charger General Description The RT9538 is a PWM sw.
Manufacture Richtek Technology
Datasheet
Download RT9538 Datasheet




Richtek Technology RT9538
®
RT9538
High Efficiency Switching Mode Battery Charger
General Description
The RT9538 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 an external resistor. The constant voltage output can
support up to 30V 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 RT9538 can charge batteries from 2.5V to 25V with
dropout voltage as low as 2V. 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
1C= : Product Code
1C=YM
DNN
YMDNN : Date Code
Features
Fast Charging for Li-ion, NiMH and NiCd Batteries
Adjustable Battery Voltages from 2.5V to 25V
High Efficiency : Up to 95%
Charging Current Adjusted by Resistor
Precision 0.5% Charging Voltage Accuracy
Provide 5% Charging Current Accuracy
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 16-Lead WQFN 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 RS4
C1 R2
C2
RT9538
ACN
V5V
R1
ACP
R3
Option
C3
Option
R4
R5
C4
C5 VFB
Option
ACDRV
BOOT
EN
VIN
ISET
VC
TG
SW
STATUS
VFB
SNSH
GND
SNSL
BATT
To System Power
D2
C7
R7
R6
M2
C8
L1
D1
C9
RS1
RS3 RS2
RF2
VBATT
CBATT
To VFB
RF1
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS9538-02 January 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1



Richtek Technology RT9538
RT9538
Ordering Information
RT9538
Package Type
QW : WQFN-16L 4x4 (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)
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
Functional Pin Description
Pin No.
1
Pin Name
ACN
Pin Function
Negative Terminal to Sense Input Current. A 0.1F ceramic capacitor is placed from
ACN to ACP to provide differential-mode filtering the switching noise.
2 ACP
Positive Terminal to Sense Input Current.
Charge Current Setting and System Loop Compensation Pin. Connect a resistor
3 ISET from this pin to ground to set the charge current. A capacitor of at least 0.1F to
GND filters out the current ripple.
4 VC
Control Signal of the Inner Loop of the Current Mode PWM. It provides the loop
compensation and soft-start.
5 VFB
Charge Voltage Analog Feedback Adjustment. Connect a resistor divider from
output to VFB to GND to adjust the output voltage. The internal regulation limit is
2.5V.
6
BATT
Battery Voltage Sense Input. A 10F or larger X5R ceramic capacitor is
recommended for filtering charge current ripple and stability purpose.
7
SNSL
Negative Terminal for Sensing Charge Current. A 0.1F ceramic capacitor is placed
from SRN to SRP to provide differential-mode filtering.
8
SNSH
Positive Terminal for Sensing Charge Current.
Flag to Indicate Charge Completion. It turns to logic high when the charge current
9 STATUS 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.
10 SW
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.
11 TG
Gate Driver Output for the External N-MOSFET.
12
BOOT
Bootstrap for High-Side Gate Driver. In normal operation, VBOOT VSW + 5V.
13 V5V
Output of Internal 5V LDO. Connect a 1F ceramic capacitor from this pin to GND
for stability.
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS9538-02 January 2017



Richtek Technology RT9538
RT9538
Pin No.
Pin Name
Pin Function
14 VIN
Input Power Supply. Connect a low ESR capacitor of 10F or higher from this pin to
ground for good bypass.
15 EN
Enable Control Input (Active High). It must be connected to a logic voltage or pulled
up to VIN with a 100kresistor.
16
ACDRV
Gate Driver Output for Input P-MOSFET.
17
(Exposed Pad)
GND
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
BATT
SNSH
SNSL
VFB
ACP
ACN
R1
300k
1.3V
-
C3
+
5V 0.5µA
VIN
2V
VIN
+
C2
-
5µA
5V
Reference
VREF
2.5V
Shutdown
UVLO
VIN
SLOP
ICHG COMP
15µA LDO
UVLO
+
- 3.8V
IVA
4
R2
+
CA
ICHG
-
VREF
2.5V
100mV
IVA
+
VA
-
+
CL
-
VREF
2.5V
-
EA
+
Oscillator
PWM
+
C1
-
S
R
ICHG
Counter
1.3V
V5V
STATUS
BOOT
TG
SW
ISET
VC
GND
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS9538-02 January 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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