®
RT9480
Easy to Use Power Bank Solution (EZPBS
TM
) Integrated Chip
with Two Ports Output
General Description
The RT9480 is a high integration and easy to use power
solution for Li-ion power bank and other powered handheld
applications. We call it EZPBS
TM
(Easy to Use Power
Bank Solution). This single chip includes a linear charger,
a synchronous Boost with dual output load management
and a torch function support. The battery volume and the
state of charging and discharging can be indicated by
4LEDs. The RT9480 is available in the WQFN-24L 4x4
package.
Features
EZPBS
TM
(Easy to Use Power Bank Solution)
Compact BOM Elements with EZPBS
TM
Single Chip
Protection Functions (OTP, OVP, OCP, VBUS and
Output Short Protection)
Support Charging and Discharging at the same time
by Smart Algorithm
Charger
One Linear Charger up to 1.2A
DPM Function (Dynamic Power Management)
Thermal Regulation
Auto-Recharge
Support JEITA Function
Applications
Li-ion Power Bank
Ordering Information
RT9480
Serial Number
Package Type
QW : WQFN-24L 4x4 (W-Type)
(Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
½
USB Output
Support Dual USB Output
Auto and Button Control
Sync-Boost Total Output Current up to 2.5A
½
Peak Efficiency 97%
Battery State of Charge (SOC) Indicator
Battery SOC Detection
Support NTC for Battery Temperature Sensing
4LEDs for Battery SOC Display
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.
½
Other Functions
Torch Functions
Simplified Application Circuit
Input Power
C
IN
L1
Battery
C1
VMID
SWIN2
C
VMID
TORCH
BUTTON
GND
Torch Function
USBOUT2
LEDx
LXBST
USBOUT1
USB Port 1
USB Port 2
LED Indicator
VBUS
RT9480
VBAT
C
BAT
Battery
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9480-04
December 2014
www.richtek.com
1
RT9480
Pin Configurations
(TOP VIEW)
VBUS
PGNDBST
PGNDBST
LXBST
LXBST
VMID
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
24 23 22 21 20 19
VBAT
TS
LED1
LED2
LED3
LED4
1
2
3
4
5
6
7
8
9 10 11 12
18
17
GND
25
16
15
14
13
USBOUT1
USBOUT1
SWIN2
USBOUT2
NC
TP2
Product Name List
Serial
Number
Product Name
RT9480GQW
AA01
AA02
AA03
AB01
RT9480GQW-AA01
RT9480GQW-AA02
RT9480GQW-AA03
RT9480GQW-AB01
Auto/Button
Button
Auto
Button
Button
--
SOC LED
Number
4LEDs
4LEDs
4LEDs
4LEDs
--
Programmable
Disable
Disable
Disable
Disable
Enable
Battery
Regulation
4.2V
4.2V
4.35V
4.2V
--
Time Out of
USBOUT Detach
12 Hours
3sec
12 Hours
3sec
--
* : Please refer to application note.
-- : Set by program
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
NC
NC
GND
TORCH
BUTTON
TP1
WQFN-24L 4x4
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9480-04
December 2014
RT9480
Functional Pin Description
Pin No.
1
2
3
4
5
6
7, 8, 14
9,
25 (Exposed Pad)
10
11
12
13
15
16
17, 18
19
20, 21
22, 23
24
Pin Name
VBAT
TS
LED1
LED2
LED3
LED4
NC
GND
TORCH
BUTTON
TP1
TP2
USBOUT2
SWIN2
USBOUT1
VMID
LXBST
PGNDBST
VBUS
Pin Function
Battery Charge Current Output.
Battery Temperature Sense Setting.
Current Sink Output for LED1.
Current Sink Output for LED2.
Current Sink Output for LED3.
Current Sink Output for LED4.
No Internal Connection.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Current Sink Output for Torch LED Function. Open Drain Output
Button Control Input for mode change.
Connected to GND.
Connected to GND.
USB-2 Power Output.
USB-2 Power Input.
USB-1 Power Output.
Boost Output.
Boost Switch Output.
Boost Power GND.
VBUS Power Supply.
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9480-04
December 2014
www.richtek.com
3
RT9480
Function Block Diagram
VBUS
Linear Charger 1.2A
VBAT
USBOUT1
USB-1 Load
Manager Up to 2.1A
USB-2 Load
Manager Up to 1A
TS
USBOUT2
SWIN2
VMID
LXBST
Central Control
1. Battery Capacity
Detection
2. Protection
3. LED Display
4. Mode Control
5. Button Operation
LED1
LED2
LED3
LED4
TP1
TP2
PGNDBST
BUTTON
Torch Brightness
Control (Open Drain)
TORCH
GND
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9480-04
December 2014
RT9480
Operation
The RT9480 is a high integrated IC for Li-Ion battery power
bank. It includes a linear charger 1.2A, a synchronous
Boost 5.1V, two output load management, LED indicator
and torch function.
Change Current
Base on thermal regulation function, the charging current
can support up to 1.2A.
VBUS OVP
If the input voltage (VBUS) is higher than the threshold
voltage V
OVP
, the internal OVP signal will go high and the
charger will stop charging until VIN is below V
OVP
−
Δ
V
OVP
.
VMID OVP
If the internal voltage (VMID) is higher than the threshold
voltage V
OVP
, the internal OVP signal will go high and the
charger will stop charging until VMID is below
V
OVP
−
Δ
V
OVP
.
OCP
The converter senses the current signal when the high-
side P-MOSFET turns on. As a result, The OCP is cycle
by-cycle current limitation. If the OCP occurs, the converter
holds off the next on pulse until inductor current drops
below the OCP limit.
Too Hot or Too Cold
The temperature sense input TS pin can be connected a
thermistor to determine whether the battery is too hot or
too cold for charging operation. If the battery's temperature
is out of range, charging is paused until it re-enters the
valid range.
Output Short Protection
When output short to ground, the system will be latched
and the output voltage will no longer be regulated until
power reset.
CC/CV/TR Multi Loop Controller
There are constant current loop, constant voltage loop and
thermal regulation loop to control the charging current.
OTP
The converter has an over-temperature protection. When
the junction temperature is higher than the thermal
shutdown rising threshold, the system will be latched and
the output voltage will no longer be regulated until the
junction temperature drops under the falling threshold.
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9480-04
December 2014
www.richtek.com
5
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