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PDF RT9480 Data sheet ( Hoja de datos )
| Número de pieza | RT9480 | |
| Descripción | Easy to Use Power Bank Solution Integrated Chip | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9480 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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®
RT9480
Easy to Use Power Bank Solution (EZPBSTM) 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 EZPBSTM (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.
Applications
Li-ion Power Bank
Ordering Information
RT9480
Serial Number
Package Type
QW : WQFN-24L 4x4 (W-Type)
(Exposed Pad-Option 2)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Features
EZPBSTM (Easy to Use Power Bank Solution)
Compact BOM Elements with EZPBSTM 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
Sync-Boost Total Output Current up to 2.5A
Peak Efficiency 97%
Battery State of Charge (SOC) Indicator
Battery SOC Detection
Support NTC for Battery Temperature Sensing
4LEDs for Battery SOC Display
Other Functions
Torch Functions
Simplified Application Circuit
Input Power
Battery
CIN
L1
C1
CVMID
VBUS
VBAT
RT9480
LXBST
VMID
SWIN2
BUTTON
USBOUT1
USBOUT2
LEDx
TORCH
GND
CBAT
Battery
USB Port 1
USB Port 2
LED Indicator
Torch Function
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9480-04 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
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 VOVP, the internal OVP signal will go high and the
charger will stop charging until VIN is below VOVP − ΔVOVP.
VMID OVP
If the internal voltage (VMID) is higher than the threshold
voltage VOVP, the internal OVP signal will go high and the
charger will stop charging until VMID is below
VOVP −ΔVOVP.
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.
RT9480
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.
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.
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.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9480-04 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Application Information
The RT9480 is a high integrated IC for Li-Ion battery power
bank. This chip includes a linear charger, a synchronous
Boost, two output load management, LED indicator and
torch function.
Pre-Charge Mode
When the output voltage is lower than 2.3V, the charging
current will be reduced to a fast-charge current ratio to
protect the battery life time.
Fast-Charge Mode
When the output voltage is higher than 2.5V, the charging
current will be equal to the fast-charge current with 1.2A.
Constant-Voltage Mode
When the output voltage is near 4.2V or 4.35V, the charging
current will fall below the termination current.
Re-Charge Mode
When the chip is in charge termination mode, the charging
current will gradually go down to zero. However, once the
voltage of the battery drops to below 4.05V or 4.2V, then
the charging current will resume again.
Charge Termination
When the charge current is lower than the charge
termination current ratio (10%) for VBAT > 4.05V or 4.2V
and the time is larger than the deglitch time (25ms), it will
be latched high unless the power is re-toggled.
Input DPM Mode
If the input voltage is lower than VDPM (4.5V), the input
current limit will be reduced to stop the input voltage from
dropping any further. This can prevent the IC from damaging
improperly configured or inadequately designed USB
sources.
Temperature Regulation
In order to maximize charge rate, the RT9480 features a
junction temperature regulation loop. If the power
dissipation of the IC results in junction temperature greater
than the thermal regulation threshold (105°C), the RT9480
will cut back on the charge current and disconnect the
RT9480
battery in order to maintain thermal regulation at around
105°C. This operation continues until the junction
temperature falls below the thermal regulation threshold
(105°C) by the hysteresis level. This feature prevents the
maximum power dissipation from exceeding typical design
conditions.
Time Fault
The Fast-Charge Fault Time is set by 24hours.
When time fault happens, the charger cycle will be turned
off charging function.
Battery Pack Temperature Monitoring
The RT9480 features an external battery pack temperature
monitoring input. The TS input connects to the NTC
thermistor in the battery pack to monitor battery
temperature and prevent danger over temperature
conditions. If at any time the voltage at TS falls outside of
the operating range, charging will be suspended. The NTC
thermistor recommends using 10kΩ.
JEITA Function
For JEITA battery temperature standard :
CV regulation voltage will change at the following battery
Temp ranges 45°C to 60°C.
4.35V or 4.2V
4.2V or 4.05V
100% Ichg
50% Ichg
0C 10C
45C 60C
Synchronous Step-Up
The converter operates in fixed frequency PWM Mode
with 250kHz, Continuous Current Mode (CCM), and
Discontinuous Current Mode (DCM) with internal
MOSFETs.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9480-04 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RT9480.PDF ] | |
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