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PDF YB1313 Data sheet ( Hoja de datos )
| Número de pieza | YB1313 | |
| Descripción | Charge Pump | |
| Fabricantes | Yobon | |
| Logotipo |  |
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YB1313
1x/1.5x/2x Charge Pump for White LED Application
Description
The YB1313 charge pump is designed to drive
up to 5 white LEDs with regulated constant
current in back lit display application. The
device can provide up to 25 mA per LED for a
total of more than 125 mA. The input voltage
ranges from 2.7V to 5.5V and is ideal for
applications powered by a single LI-Ion or 3 to
4 NiCd, NiMH or Alkaline batteries.
The 1MHz fix-frequency switching allows for
tiny external components, and the regulation
scheme is optimized to ensure low EMI and
low input ripple.
Internal soft-start circuitry effectively reduces
the in-rush current. YB1313 also provides short
circuit protection, over-temperature protection
and over-voltage protection. In shutdown mode,
the shutdown current is less than 1μA. YB1313
is available in a TQFN-16 3x3 package.
Features
Input Range : 2.7V to 5.5V
Drives up to 5 LEDs at 25mA Each
1MHz Internal Oscillator
Thermal Protection Shutdown
Output Short-circuit Current Limit and
Over-voltage Protection
Under-Voltage Lockout With Hysteresis
Automatic Soft-Start Reduces In-Rush
Current
Three Charge Pump Mode：1x/1.5x/2x
3mm x 3mm TQFN package
Applications
White LED Backlighting
Handheld PCs and PDAs
Mobile Phone
Typical Application Circuit
VIN = 2.7V
To 5.5V
1 µF
0. 47 µF
0. 47 µF
VIN VOUT
C1+
D1
C1- D2
C2+
D3
YB 1313
C2- D4
EN1
D5
EN2
GND
ISET
PGND
2.2uF
YB1313 MRev.1.1
Figure 1. Typical application circuit
www.yobon.com.tw
1
1 page  
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Functional Block
YB1313
1x/1.5x/2x Charge Pump for White LED Application
C1+ 10
C1- 11
C2+ 9
C2- 12
VIN 13
PGND VOUT
78
1x/1.5x/2x
Charge Pump
Reference
Current Sinks
+
Selmin
-
2 D5
3 D4
4 D3
5 D2
6 D1
EN1 15
EN2 16
Control
14
GND
Figure 3. Block Diagram
1 ISET
Functional Description
The YB1313 uses a multi-mode fractional
charge pump to generate a supply voltage and a
precise sink circuitry to ensure a constant
driving current for each LED. The charge pump
operates in either 1x mode, 1.5x mode or 2x
mode, depending on the input voltage and
output current loading. The overall power
consumption is best optimized by automatically
switching among the 3 different operation
mode.
The charge pump is possible to generate a total
output current of more than 125 mA, more than
25 mA for each LED. But it is recommended to
operate the device under total 125 mA.
Connecting a RSET resistor of 10K ohm from
pin ISET to ground generates around 20 mA
LED output current and a RSET of 7.5K
generates around 26 mA.
YB1313 MRev.1.1
www.yobon.com.tw
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet YB1313.PDF ] | |
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