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PDF RT9526A Data sheet ( Hoja de datos )
| Número de pieza | RT9526A | |
| Descripción | Linear Single Cell Li-Ion Battery Charger | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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®
RT9526A
Linear Single Cell Li-Ion Battery Charger with Input Over
Voltage Protection
General Description
The RT9526A is a fully integrated low cost single cell Li-
ion battery charger ideal for portable applications. The
RT9526A is capable of being powered up from AC adapter
and USB (Universal Serial Bus) port inputs. The RT9526A
enters sleep mode when supplies are removed. The
RT9526A optimizes the charging task by using a control
algorithm including preconditioning mode, fast charge
mode, and constant voltage mode. The charging task will
remain in constant voltage mode to hold the battery in a
full charge condition. The charge current can be
programmed with an external resistor. The internal thermal
feedback circuitry regulates the die temperature to optimize
the charge rate under all ambient temperatures. The
RT9526A features 28V maximum rating voltage for VIN.
Under-voltage protection and over-voltage protection are
provided for the AC adapter supply.
The RT9526A is available in the WDFN-8L 2x3 and
SOT-23-6 package to achieve best solution for PCB space
and total BOM cost saving considerations.
Applications
Cellular Phones
Digital Cameras
PDAs and Smart Phones
Portable Instruments
Features
28V Maximum Rating for AC Adapter with Over-
Voltage Protection 7V
Internal Integrated Power FETs
AC Adapter Power Good Status Indicator
Programmed Charging Current
Charge Status Indicator
Programmed End of Charge Current
Under-Voltage Protection
Thermal Feedback Optimizing Charge Rate
RoHS Compliant and Halogen Free
Ordering Information
RT9526A
Package Type
QW : WDFN-8L 2x3 (W-Type)
E : SOT-23-6
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.
Simplified Application Circuit
Adapter or USB
CIN
RISET
RIMIN
VIN BATT
RT9526A
ISET
IMIN
GND
ENB
PGB
CHG_SB
COUT
R1
R2
VBATT
VBATT
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9526A-03 July 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT9526A
Parameter
VIN Over-Voltage Protection
Threshold
VIN OVP Hysteresis
PGB Pull-Down Voltage
CHG_SB Pull-Down Voltage
EOC Current Setting
EOC Rising Threshold
Symbol
Test Conditions
VOVP
VOVP
IIMIN
5mA
5mA
RIMIN = 243k
RIREF = 24.3k
Min Typ Max Unit
6.7 7 7.5 V
-- 0.1 --
V
-- 200 -- mV
-- 200 -- mV
-- 45 -- mA
337.5 375 412.5 mA
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. The device is not guaranteed to function outside its operating conditions.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9526A-03 July 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT9526A
PD(MAX) = (125°C − 25°C) / (31.5°C/W) = 3.17W for
WDFN-8L 2x3 package
PD(MAX) = (125°C − 25°C) / (208.2°C/W) = 0.48W for
SOT-23-6 package
The maximum power dissipation depends on the operating
ambient temperature for fixed TJ(MAX) and thermal
resistance, θJA. The derating curve in Figure 3 allow the
designer to see the effect of rising ambient temperature
on the maximum power dissipation.
4.0
3.5 WDFN-8L 2x3
Four-Layer PCB
3.0
2.5
2.0
1.5
1.0
SOT-23-6
0.5
0.0
0
25 50 75 100
Ambient Temperature (°C)
125
Figure 3. Derating Curve of Maximum Power Dissipation
Layout Consideration
The RT9526A is a fully integrated low cost single-cell Li-
ion battery charger ideal for portable applications. Careful
PCB layout is necessary. For best performance, place all
peripheral components as close to the IC as possible. A
short connection is highly recommended. The following
guidelines should be strictly followed when designing a
PCB layout for the RT9526A.
Input capacitor should be placed close to the IC and
connected to the ground plane. The trace of input on
the PCB should be placed far away from the sensitive
devices and shielded by the ground.
The GND and exposed pad should be connected to a
strong ground plane for heat sinking and noise protection.
The connection of RISET should be isolated from other
noisy traces.
Output capacitor should be placed close to the IC and
connected to the ground plane to reduce noise coupling.
BATT
BATT
R1
R2
CIN should be placed near the
IC to improve performance.
VIN BATT
CIN COUT
The copper area connecting the
resistors of ISET and IMIN should
be minimized and kept far away
from noise sources.
VIN 1
PGB 2
CHG_SB 3
ENB 4
8 BATT RISET
7 ISET
9
6 IMIN
5 GND
RIMIN
GND
The GND plane should be connected to a strong
ground plane for heat sinking and noise protection.
Figure 4. PCB Layout Guide
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9526A-03 July 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT9526A.PDF ] | |
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