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Yobon
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YB1313

Charge Pump



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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 Mode1x/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



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Pin Configuration
YB1313
1x/1.5x/2x Charge Pump for White LED Application
TQFN-16 3x3 Package
12 11 10
13
VIN
14
GND
15
EN1
16
EN2
1234
9
VOUT
8
PGND
7
D1
6
D2
5
Pin Description
Table 1
Figure 2. Pin configuration
Pin Name
Description
1 ISET Connect a RSET resistor between this pin and GND. RSET=10K, set ILED to 20 mA (Recommanded)
2 D5 Current sink output #5. If not used, connected to VIN or floating
3 D4 Current sink output #4. If not used, connected to VIN or floating
4 D3 Current sink output #3. If not used, connected to VIN or floating
5 D2 Current sink output #2. If not used, connected to VIN or floating
6 D1 Current sink output #1. If not used, connected to VIN or floating
7 PGND Power GND
8 VOUT Charge pump output
9 C2+ Flying capacitor 2 positive terminal. Connect a 0.47μF capacitor between C2+ and C2-.
10 C1+ Flying capacitor 1 positive terminal. Connect a 0.47μF capacitor between C1+ and C1-
11 C1- Flying capacitor 1 negative terminal
12 C2- Flying capacitor 2 negative terminal
13 VIN Input Voltage
14 GND Analog GND
15 EN1 Enable input1
Enable input2. EN1 and EN2 can be used for digital dimming with 4 steps from 0mA to the maximum
16 EN2
current set with ISET.
Ordering Information
Table 2
Order Number
YB1313QF33
Package Type
TQFN 3X3
Supplied as
2500 units Tape & Reel
YB1313 MRev.1.1
www.yobon.com.tw
Package Marking
1313
2



Part Number YB1313
Description Charge Pump
Maker Yobon - Yobon
Total Page 9 Pages
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