®
RT9466
5A Single Cell Li-Ion Switching Battery Charger with Power
Path Management and USB-OTG Boost Mode
General Description
The RT9466 is a switch-mode single cell Li-Ion/Li-Polymer
battery charger for portable applications. It integrates a
synchronous PWM controller, power MOSFETs, input
current sensing and regulation, high-accuracy voltage
regulation, and charge termination. The charge current is
regulated through integrated sensing resistors. The
RT9466 also features USB On-The-Go (OTG) support.
The RT9466 optimizes for charging task by using a control
algorithm to vary the charge rate for different modes,
including pre-charge mode, fast charge mode (constant
voltage and constant current). The key charge parameters
are programmable through an I
2
C interface. The RT9466
will resume the charge cycle whenever the battery voltage
falls below an internal recharge threshold, and can
automatically enter sleep mode if the input power supply
is removed.
Other features include under-voltage protection, over-
voltage protection, thermal regulation and reverse leakage
protection.
The RT9466 is available in a WQFN-24L 4x4 package.
Features
High Efficiency 5A, 1.5MHz Switching Charger with
Output Inductor DFE252012F, TOKO
Charging Efficiency 90.25% at ICHG = 2A
½
Charging Efficiency 88.86% at ICHG = 3A
½
Charging Efficiency 84.2% at ICHG = 5A
Synchronous 1.5MHz/0.75MHz Fixed-Frequency
PWM Controller with Up to 95% Duty Cycle
Power Path Management by BATFET Control
Support High Voltage Input (9V/12V)
Support High Voltage Input Adapter (Pump Express
1.0/2.0)
Support IR Compensation Function from Charger
Output to Cell Terminal
Optimize Input Sourcing Capability to Prevent
Overload
2
½
AICR Current Limit Setting via I C
½
ILIM Pin for Current Limit Setting
½
Average Input Current Limit Measurement
Shipping Mode for Battery Leakage Reduction
½
Wake Up System, Exit Shipping Mode, and Reset
System by QON Pin
Automatic Charging
Average Input Current Regulation (AICR) :
0.1A to 3.25A in 50mA Steps
Charge Current Regulation Accuracy :
±
7%
Charge Voltage Regulation Accuracy :
±
1% (0 to
85°C)
°
Protection for Overall System Considerations
½
Thermal Regulation for Current Reduction and
Over-Temperature Protection
½
Input Over-Voltage Protection
½
Input Bad Adapter Protection
½
Battery Over-Voltage Protection
Support ADC Conversion for
½
VBUS, VBAT, VSYS, REGN, TS_BAT, IBUS, IBAT,
TEMP_JC
INT Output for Communication with Host Through
I
2
C (Watch Dog/Polling Function)
½
Applications
Cellular Telephones
Personal Information Appliances
Tablet PC, Power Bank
Portable Instruments
Ordering Information
RT9466
Package Type
QW : WQFN-24L 4x4 (W-Type)
(Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
½
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
½
Suitable for use in SnPb or Pb-free soldering processes.
is a registered trademark of Richtek Technology Corporation.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
DS9466-03 November 2017
www.richtek.com
1
RT9466
Marking Information
4S= : Product Code
Pin Configuration
(TOP VIEW)
NC
VMID
REGN
BTST
LX
LX
24 23 22 21 20 19
4S=YM
DNN
YMDNN : Date Code
VBUS
PSEL
PG
STAT
SCL
SDA
1
2
3
4
5
6
7
8
9 10 11 12
18
17
PGND
25
16
15
14
13
PGND
PGND
SYS
SYS
BAT
BAT
Typical Application Circuit
RT9466
Input
4V to 14V
2.2µF
23
4.7µF
4.7µF
22
4.7µF
3
4
698
PG
STAT
SYS
REGN
BAT
13, 14
10µF
REGN
15, 16
VMID
LX
19, 20
1
VBUS
BTST
21
47nF
1µH
To System
10µF
10µF
10 ILIM
TS
5
11
Battery
Pack
SCL
SDA
CEB
OTG
PSEL
PGND
17, 18
INT
QON
7
12
To I C BUS
2
6
9
8
2
Below are recommended components information
Pin
VBUS
VMID
BTST
SYS
BAT
REGN
LX
ILIM
Description
2.2F/25V/X5R
4.7F/25V/X5R
47nF/16V/X5R
10F/6.3V/X5R
10F/6.3V/X5R
4.7F/6.3V/X5R
1H/20%
698/1%
Part Number
GRM155R61E225KE11
GRM188R61E475KE11
GRM033R61C473KE84
GRM185R60J106ME15
GRM185R60J106ME15
GRM155R60J475ME47
DFE252012F-1R0
RR0306S-6980-FNH
INT
OTG
CEB
ILIM
TS
QON
WQFN-24L 4x4
Package
0402
0603
0201
0603
0603
0402
2.5 x 2mm
0201
Manufacturer
muRata
muRata
muRata
muRata
muRata
muRata
TOKO
CYNTEC
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9466-03 November 2017
RT9466
Functional Pin Description
Pin No.
1
2
3
Pin Name
VBUS
PSEL
PG
Power input.
Power source selection input : High : USB host, I
BUS
= 500mA; Low : adapter
source, I
BUS
= 3.25A, and ILIM select minimum current value. (Internal pull
down 102k)
Open-drain output. Low if the VBUS voltage is between V
UVLO
and V
BUS_OVP
;
VBUS is higher than VBAT. VBUS current capability is larger than 50mA.
Charge status indication, open-drain output that indicates charge is in progress
when held low and charge is finished when held High. If any fault occurs,
CHG_STAT will blink at the frequency of 1Hz. Connect a 2.2k-10k pull-up
resistor.
I
2
C interface serial clock input. Open-drain. An external pull-up resistor is
required
I
2
C interface serial data input/output. Open-drain. An external pull-up resistor is
required.
Interrupt output, active-low open-drain. Indicator of the charger/Boost event for
system processor.
OTG boost mode enable control, active-high. Act with OTG_PIN_EN
(Addr0x01[1]). (Internal pull down 102k)
Charger enable input, active-low. (Internal pull down 102k)
Input current limit setting pin. A resistor is connected from ILIM pin to ground to
set the maximum input current limit. The actual input current limit is the lower
value set through the ILIM pin and IAICR register bits, and PSEL select
minimum current value.
Battery temperature-sense input, connected to a resistor divider for temperature
programming. If there is no need for the battery temperature-sense function, a
50k resistor is connected to REGN and another 50k resistor to ground.
Internal BATFET enable control input. In shipping mode,
QON
is pulled Low for
the duration of t
SHIPMODE
(typical 0.9s) to exit shipping mode.
Charge current output node for battery connection. The internal BATFET is
connected between VSYS and BAT. Connect a 10F ceramic capacitor between
BAT and ground.
System connection node. The internal BATFET is connected between SYS and
BAT. Connect a 20F ceramic capacitor between SYS and ground.
Power ground.
Switch node for output inductor connection.
Bootstrap capacitor connection for high-side gate driver. Connect a capacitor
from BTST to LX to power the internal gate driver.
Pin Description
4
STAT
5
6
7
8
9
10
SCL
SDA
INT
OTG
CEB
ILIM
11
12
13, 14
15, 16
17, 18
19, 20
21
TS
QON
BAT
SYS
PGND
LX
BTST
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9466-03 November 2017
www.richtek.com
3
RT9466
Pin No.
Pin Name
Pin Description
Regulated output voltage to supply for the PWM low-side gate driver and the
bootstrap capacitor. Connect a 4.7F ceramic capacitor from REGN to GND.
1. If VBUS is plugged in, REGN will be powered by VBUS and regulated to
4.9V.
2. If VBUS is unplugged, the charger will operate in sleep mode and the REGN
voltage will be 0V.
* For #2. : Since the REGN voltage is also used to power the TS resistor, when
the charger is in sleep mode, the REGN will be woken up (be reactivated) if
VBAT is greater than forward voltage (V
F
) of the internal high-side (HS) MOS
diode by V
SLEEP_EXIT
with all function of the internal ADC being activated and
I
2
C R/W. The REGN wake-up time is 500ms.
Connection point between the reverse blocking MOSFET and the high-side
switching MOSFET.
No internal connection.
Power ground. The exposed pad must be connected to GND and well soldered
to a large PCB copper area for maximum power dissipation.
22
REGN
23
24
25
(Exposed Pad)
VMID
NC
PGND
Functional Block Diagram
REGN
VBUS
LDO
VMID
BTST
PSEL
Input Source
Detection
UUG
Controller
Charger/OTG
Controller
H/L
Driver
LX
Analog Base
PGND
SYS
Protection
SCL
SDA
INT
State Machine
TS
STAT
Silicon Temp
Detection
VBUS
VSYS
I C
ADC
2
Power path
Controller
BAT
IBUS
IBAT
REGN
PG
OTG
CEB
ILIM
QON
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9466-03 November 2017
RT9466
Operation
The RT9466 is an integrated single cell Li-ion battery
switching charger with power path controller.
Base Circuits
Base circuits provide the internal power, VREGN and
reference voltage and bias current.
Protection Circuits
The protection circuits include the VINOVP, VINUVLO,
BATOVP and OTP circuits. The protection circuits turn
off the charging when the input power or die temperature
is in abnormal level.
Buck Regulator for Charging and Boost Regulator
as OTG
The multi-loop controller controls the operation of charging
process and current supply to the system. It also controls
the circuits as a Boost converter for OTG applications.
Battery Detection
The RT9466 is capable of doing the battery absence
detection. The detection protects the charger when battery
is removed accidentally.
Adapter Detection
If the poor input power source is connected to the RT9466,
the operation will be shut down by the adapter detection.
Power Path Management and Control
Once the battery voltage increases to a defined system
minimum regulation voltage, the internal path between
SYS and BAT will be fully turned on. That is, a better
charging efficiency can be achieved. When end of charge
occurs, the charging will stop and the internal path will be
turned off.
TS Detection
The RT9466 detects the temperature of the battery pack
via REGN and TS pins. The REGN pin provides a constant
voltage source to drive the voltage divider composed of a
pulled-high resister and a NTC resister. The RT9466 reports
the sensing results via IRQ and status bits for COLD,
COOL, WARM and HOT.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
I
2
C Controller
The key parameters of charging and OTG are programmable
through I
2
C commands.
DS9466-03 November 2017
www.richtek.com
5
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