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  Richtek Technology Electronic Components Datasheet  

RT9511 Datasheet

Fully Integrated Battery Charger

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RT9511
Fully Integrated Battery Charger with Two
Step-Down Converters
General Description
The RT9511 is a fully integrated low cost solution with a
single-cell Li-Ion battery charger and two high efficiency
step-down DC/DC converters ideal for portable
applications.
The Battery Charger is capable of being powered up from
AC adapter and USB (Universal Serial Bus) port inputs
which can automatically detect and select the AC adapter
and the USB port as the power source for the charger.
The Battery Charger enters sleep mode when both
supplies are removed. The Battery Charger optimizes the
charging task by using a control algorithm including
preconditioning mode, fast charge mode and constant
voltage mode. The charging task is terminated as the
charge current drops below the preset threshold. The USB
charge current can be selected from preset ratings100mA
and 500mA, while the AC adapter charge current can be
programmed up to 1A with an external resister. The internal
thermal feedback circuitry regulates the die temperature
to optimize the charge rate for all ambient temperatures.
The Battery Charger features 18V and 7V maximum rating
voltages for AC adapter and USB port inputs respectively.
The other features are external programmed safety timer,
under voltage protection, over voltage protection for AC
adapter supply, battery temperature monitoring and charge
status indicator.
The high-efficiency step-down DC/DC converter is capable
of delivering 1A output current over a wide input voltage
range from 2.5V to 5.5V, the step-down DC/DC converter
is ideally suited for portable electronic devices that are
powered from 1-cell Li-ion battery or from other power
sources such as cellular phones, PDAs and hand-held
devices. Two operating modes are available including :
PWM/Low-Dropout autoswitch and shut-down modes. The
Internal synchronous rectifier with low RDS(ON) dramatically
reduces conduction loss at PWM mode. No external
Schottky diode is required in practical application.
The RT9511 is available in a WQFN -24L 4x4 package.
Features
z Battery Charger
` Automatic Input Supplies Selection
` 18V Maximum Rating for AC Adapter
` Integrated Selectable 100mA and 500mA USB
Charge Current
` Internal Integrated Power FETs
` Charge Status Indicator
` External Capacitor Programmable Safety Timer
` Under Voltage Protection
` Over Voltage Protection
` Automatic Recharge Feature
` Battery Temperature Monitoring
` Thermal Feedback Optimizing Charge Rate
` Power Path Controller
z Step-Down DC/DC Converter
` Adjustable Output from 0.6V to VIN
` 1A Output Current
` 95% Efficiency
` No Schottky Diode Required
` 1.5MHz Fixed-Frequency PWM Operation
z Small 24-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z MP3/MP4 Player
z GPS
z Digital Photo Frame
z Hand held Device
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9511-01 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9511 Datasheet

Fully Integrated Battery Charger

No Preview Available !

RT9511
Ordering Information
RT9511
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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.
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
GND 1
18 BAT_ON
EN1 2
17 BATT
VDD1 3
LX1 4
GND
16 TS
15 TIMER
GND 5
25 14 EN
FB2 6
13 NC
7 8 9 10 11 12
WQFN-24L 4x4
Typical Application Circuit
System
VACIN
VUSB
1µF
1µF RSETA
RT9511
19 SYS
18
BAT_ON
21 AC_ON
23 CHG_S
BATT 17
12 ISETU
22 ACIN
TS 16
TIMER 15
20 USB
EN 14
11 ISETA
CT0.1µF
Battery Pack
Chip Enable
VIN
2.5V to 5.5V
VOUT1
C1O0UµTF1
CIN1
4.7µF
L1
2.2µH
R1 C1
R2 IR2
3 VDD1
2 EN1
4 LX1
VDD2 9
EN2 8
LX2 10
L2
2.2µH
24 FB1
FB2 6
GND
1, 5, 7, 25 (Exposed Pad)
CIN2
4.7µF
C2 R3
IR4 R4
VIN
2.5V to 5.5V
VOUT2
1C0OµUFT2
www.richtek.com
2
DS9511-01 April 2011


Part Number RT9511
Description Fully Integrated Battery Charger
Maker Richtek Technology
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RT9511 Datasheet PDF






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