®
RT9465
3A Single Cell Li-on Battery Slave Switching Charger
General Description
The RT9465 is a switch-mode single cell li-Ion/Li-Polymer
battery charger for portable applications. It integrates a
synchronous PWM controller, and high accuracy voltage
regulation. Besides, the charging current is regulated
through the integrated sensing resistors.
The RT9465 optimizes the charging task by using a control
algorithm to vary the charge rate via different modes,
including fast charge mode, and constant voltage mode.
The key charge parameters are programmable via the I
2
C
interface. The junction temperature is monitored by I
2
C.
Other features include under-voltage protection, over-
voltage protection (including V
BAT
and V
BUS
side), thermal
regulation and reverse leakage protection and MIVR.
The RT9465 is available in a WQFN-16L 3x3 Package.
Features
Input Voltage Range : 3.9V to 14V
Synchronous 1.5MHz/0.75MHz Switching Frequency
95% Max. Duty
Up to 92%/94% Peak Efficiency at VIN = 9V/5V
VIN Over-Voltage Protection : 14.5V
VIN Under-Voltage Protection : 3.8V
VIN Under-Voltage-Lock-Out : 3.3V
Fault Detection (VIN and VBAT Monitoring)
INT Output for Communication with I
2
C
Programmable Minimum Input Voltage Range :
3.9V to 13.4V (0.1V/Step)
Programmable Battery Voltage Regulation Range :
3.8V to 5.06V (0.02V/Step)
Programmable End of Charge Range : 0.6A to 1.6A
(0.1A/Step)
Programmable Average Output Current Regulation
Range : 0.6A to 3A (0.1A/Step)
Junction Temperature Monitor : 60°C to 116°C (4°C/
°
°
°
Step)
VIN Minimum Input Voltage Regulation (MIVR) :
±
3%
Battery CV (Constant Voltage) Regulation :
±
1%
Output CC (Constant Current) Regulation, Output
Current < 1A :
±
100mA (VBUS = 9V/12V)
Output CC (Constant Current) Regulation, Output
Current > 1A :
±
10% (VBUS = 9V/12V)
Junction Temperature Monitor :
±
3°C
°
Thermal Shutdown : 160°C
°
Ordering Information
RT9465
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
½
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.
Marking Information
K7= : Product Code
Applications
K7=YM
DNN
YMDNN : Date Code
Cellular Telephones
Personal Information Appliances
Tablet PC, Power Bank
Portable Instruments
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9465-00 May 2017
www.richtek.com
1
RT9465
Pin Configuration
(TOP VIEW)
BOOT
SW
SW
SW
16 15 14 13
VIN
VIN
REG
SDA
1
2
3
4
5
6
7
8
12
AGND
17
11
10
9
PGND
PGND
AGND
BAT+
WQFN-16L 3x3
Functional Pin Description
Pin No.
1, 2
3
4
5
6
7
8
9
10,
17 (Exposed Pad)
11, 12
13, 14, 15
16
Pin Name
VIN
REG
SDA
SCL
EN
INT
BAT-
BAT+
AGND
PGND
SW
BOOT
Power input.
PWM low side driver and bootstrap power supply.
Data input for I
2
C.
Data input for I
2
C.
Device enable control pin. Pull low to disable device.
Open drain. Interrupt signal to Host.
Negative battery voltage sense.
Positive battery voltage sense.
Analog ground. The exposed pad must be soldered to a large PCB and
connected to AGND for maximum thermal dissipation
Power ground.
Switch node. Connect to an external inductor
Bootstrap supply for high-side MOSFET. Connect a capacitor between BOOT
and SW.
Pin Function
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
SCL
EN
INT
BAT-
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9465-00 May 2017
RT9465
Typical Application Circuit
RT9466
(Main Charger)
VBUS
3.9V to 14V
VBUS
C
IN
2.2µF
VMID
V
SYS
BOOT
STAT
QON
ENB
SCL
SDA
IRQ_M
PGOOD
QON
CEB
SCL
SDA
INT
PGOOD
V
REG_M
AGND PGND
PGND
AGND
10,
11, 12
17 (Exposed Pad)
TS
+
BAT-
8
SW
SYS
BAT
C
BAT
10µF
C
BT_M
47nF
VMID
C
IN
_1
4.7µF
C
IN
_2
4.7µF
BOOT
L1
1µH
6
5
C
SYS
10µF
IRQ_S
4
16
C
BT_S
47nF
L2
1µH
C
OUT
10µF
REG
V
REG_M
C
REG_M
4.7µF
C
IN_S
2.2µF
VIN
RT9465
(Slave Charger)
REG
3
V
REG_S
C
REG_S
4.7µF
V
SYS
C
SYS
10µF
GPIO
EN
SCL
SDA
BAT+
9
SW
13, 14, 15
V
OUT
7 INT
Note : The total C
IN
of slave charger between PMID pin of main charger is 10µF at least.
Table 1. Component List of Evaluation Board
Reference
C
IN_S
C
REG_S
C
BT_S
C
OUT
L1
U1
Q'ty
1
1
1
1
1
1
Part Number
GRM155R61E225KE11
GRM155R60J475ME47
GRM033R61C473KE84
GRM188R61A106KE69
DFE252012F
RT9465
Description
2.2F/25V/X5R
4.7F/6.3V/X5R
47nF/16V/X5R
10F/10V/X5R
1H
CHIP
Package
0402
0402
0201
0603
2.5x2.0x1.2
WQFN-16L 3x3
Manufacturer
muRata
muRata
muRata
muRata
TOKO
RICHTEK
Note 1.
The total C
IN
of slave charger between PMID pin of main charger is 10μF at least.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9465-00 May 2017
www.richtek.com
3
RT9465
Functional Block Diagram
VIN
OVP/
UVP
Pre-regulator
REG
BOOT
EN
Digital
Control
Oscillator
Q2
Controller
SCL
I C Control
SDA
INT
Protection
Battery
Monitoring
Junction
Temperature
Monitoring
2
SW
Q3
PGND
BAT+
BAT-
AGND
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9465-00 May 2017
RT9465
Absolute Maximum Ratings
(Note 2)
−0.3V
to 22V
−0.3V
to 22V
−0.3V
to 20V
−0.3V
to 6V
−0.3V
to 6V
3.33W
Supply Input Voltage ----------------------------------------------------------------------------------------------------
BOOT -----------------------------------------------------------------------------------------------------------------------
SW --------------------------------------------------------------------------------------------------------------------------
MID
−
VIN, BOOT
−
SW ----------------------------------------------------------------------------------------------
Others ----------------------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WQFN-16L 3x3 -----------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 3)
WQFN-16L 3x3,
θ
JA
----------------------------------------------------------------------------------------------------- 30°C/W
WQFN-16L 3x3,
θ
JC
----------------------------------------------------------------------------------------------------- 7.5°C/W
Lead Temperature (Soldering, 10sec.) ------------------------------------------------------------------------------ 260°C
Junction Temperature --------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 4)
HBM (Human Body Model) -------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 5)
Supply Input Voltage ---------------------------------------------------------------------------------------------------- 3.9V to 14V
Junction Temperature Range ------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= 5V, V
BAT
= 4.2V, L = 1μH, C
IN
= 10μF, C
BATS
= 10μF, T
A
= 25°C, unless otherwise specified)
Parameter
Quiescent Current
Symbol
Test Conditions
Min
Typ
Max
Unit
I
(VIN)_SW
VIN Supply Current
I
(VIN)_SW
I
(VIN)_no_SW
Leakage Current from
Battery
VIN/VBAT Power up
VIN Under-Voltage
Protection
VIN Under-Voltage
Protection Hysteresis
Input Power Regulation
Input Voltage Regulation
Range
V
MIVR
V
UVP
V
UVP_HYS
I
BAT_leak
PWM is switching, V
IN
= 5V,
V
BAT+
= 3.8V
PWM is switching, V
IN
= 9V,
V
BAT+
= 3.8V
PWM is non-switching, V
IN
= 5V,
V
BAT+
= 4.4V
Charger disable, V
BAT
= 3.8V
--
--
--
--
8
28
--
--
--
--
2
1
A
mA
--
--
3.8
150
--
--
V
mV
I
2
C programmable per 0.1V
3.9
--
13.4
V
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9465-00 May 2017
www.richtek.com
5
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