your power partner.
RT9480GQW
Evaluation Board
Dual Output Power Bank Reference Design Using RT9480
EZPBS™ Integrated Chip
Purpose
The RT9480 is a high integration and this single chip includes a linear charger a synchronous Boost with dual
output load management and a torch function support.This document explains the function and use of the RT9480
evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and
circuit to suit individual requirements.
Table of Contents
Purpose .............................................................................................................................................................. 1
Introduction........................................................................................................................................................ 2
General Description ........................................................................................................................................... 2
Features ............................................................................................................................................................. 2
Application ......................................................................................................................................................... 2
Evaluation Board ............................................................................................................................................... 2
Specification ...................................................................................................................................................... 3
Schematic .......................................................................................................................................................... 3
BOM.................................................................................................................................................................... 4
PCB Layout ........................................................................................................................................................ 4
LED Indicator Function...................................................................................................................................... 5
Charging Test with 6000mAh ............................................................................................................................ 6
Boost Efficiency Test ........................................................................................................................................ 6
More Information ............................................................................................................................................... 7
Important Notice for Richtek Evaluation Board................................................................................................ 7
EVB_RT9480GQW-00
June 2015
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your power partner.
RT9480GQW
Evaluation Board
Introduction
General Product 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™ (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.
Product Features
EZPBS™ (Easy to Use Power Bank Solution)
Compact BOM Elements with EZPBS™ 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
USB Output
Support Dual USB Output
Auto and Button Control
One Sync-Boost up to 2.5A
Peak Efficiency 97%
Battery State of Charge (SOC) Indicator
Battery SOC Detection
Support NTC for Battery Temperature Sensing
4 LEDs for Battery SOC Display
Application
Li-ion Power Bank
Evaluation Board
Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components
are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to
evb_service@richtek.com
EVB_RT9480GQW-00
June 2015
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RT9480GQW
Evaluation Board
your power partner.
Test Points
The EVB is provided with the test points and pin names listed in the table below.
Test point/Pin name
Signal
Comment (expected waveforms or voltage levels on test points)
VBAT
Input voltage
Input voltage range = 3V to 4.2V
USBOUT
Output voltage
Output voltage = 5.1V
VBUS
Input voltage
Input voltage range = 4.75V to 5.25V
GND
Ground
Ground
Power-up & Measurement Procedure
1.
RT9480 starts work by provide VBAT voltage then plug-in VBUS.
2.
Chargeing: Adapter or USB plug-in
3.
Discharging: PD plug-in
Specification
Parameter
Symbol
VBUS Operation Voltage Range
Output Voltage
Min
Typ.
Max
Units
5
5.5
V
VOUTBST
5.1
V
Switching Frequency
FSW
250
kHz
MAX Output Current
IOUT
2.5
A
Battery Quiescent Current
for Standby_Auto Mode
IBAT_sdy
90
μA
Battery Quiescent Current
for Standby_Button Mode
IBAT_sdy
30
μA
Schematic
EVB_RT9480GQW-00
June 2015
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RT9480GQW
Evaluation Board
your power partner.
BOM
Reference
Q'ty
P/N
Description
Package
Manufacture
U7
1
RT9480
E2U Power Bank Solution
WQFN-24L 4x4
RICHTEK
U9
1
S-8261ACKMD-G4KT2x
Battery Protection IC
SOT-23-6
SEIKO
U10, U11
2
SIS438DN
NMOS
SIS438DN
VISHAY
C1, C3, C7
3
EMK212ABJ106KD-T
10μF/16V/X5R
C-0805
TAIYO
C2, C6, C8
3
EMK212B7105KD-T
1μF/16V/X7R
C-0805
TAIYO
C4, C5
2
LMK212BBJ226MD-T
22μF/10V/X5R
C-0805
TAIYO
C10
1
UMR107B7104KA-T
0.1μF/50V/X7R
C-0603
TAIYO
L1
1
LVS505040-1R0-N
Power Inductor
L-NR8040
CHILISIN
R1
1
RM06FTN1002
10K/0603/1%
R-0603
TA-I
R7, R8
2
RM04FTN4992
49.9K/0402/1%
R-0402
TA-I
R9
1
RM04FTN4700
470/0402/1%
R-0402
TA-I
R10
1
RM04FTN2001
2K/0402/1%
R-0402
TA-I
D1, D2, D3, D4
4
SMD LED
D-0603
SW1
1
USB2
1
USB-MICRO
USB-MICRO
JP3
1
USB PortX2
USB-A
SW KEY-YM061
Switch
PCB Layout
Top View
EVB_RT9480GQW-00
June 2015
Bottom View
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RT9480GQW
Evaluation Board
LED Indicator Function
About LED indicator, it will follow below table to show SOC. The LED current is 0.75mA.
●●●●
Low→High
● : LED ON, ○ : LED OFF, ● : LED FLASH
Battery Voltage
Operation of Charging
●○○○
●●○○
3700mV
●●●○
●●●●
●●○○
3700mV
3940mV
●●●○
●●●●
●●●○
3940mV
4100mV
●●●●
4100mV
4200mV
●●●●
4200mV
●●●●
Battery Voltage
Operation of Discharging
4200mV
3880mV
●●●●
3880mV
3720mV
●●●○
3720mV
3500mV
●●○○
3500mV
3200mV
3200mV
2800mV
EVB_RT9480GQW-00
●○○○
●○○○
June 2015
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RT9480GQW
Evaluation Board
your power partner.
Charging Test with 6000mAh
4.5
1,600
1,500
VBAT (V)
4
1,300
1,200
1,100
1,000
900
3.5
800
700
600
500
3
Charge Current (mA)
1,400
VBAT
IVBUS
400
300
200
100
2.5
0
0
2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000
Charge Time (sec.)
Boost Efficiency Test
Efficiency (%)
100
90
3.1V
80
3.2V
70
3.3V
60
3.4V
50
3.7V
40
3.9V
30
4.2V
20
10
0
0.1
1
10
IOUT (A)
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June 2015
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your power partner.
RT9480GQW
Evaluation Board
More Information
For more information, please find the related datasheet or application notes from Richtek website
http://www.richtek.com.
Important Notice for Richtek Evaluation Board
THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL BE CONSTRUED AS RICHTEK’S WARRANTY, EXPRESS
OR IMPLIED, UNDER CONTRACT, TORT OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL RICHTEK BE LIABLE TO
BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES.
EVB_RT9480GQW-00
June 2015
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