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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
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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
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YB1313
1x/1.5x/2x Charge Pump for White LED Application
Absolute Maximum Ratings
Recommended Operating Conditions
y Supply Voltage.................................................. 6.5V
y Output Voltage.................................................. 5.5V
y Output Short-Circuit Duration................Continuous
y Junction Temperature Range ........................ +125
y Storage Temperature Range............-65to +150
y Lead Temperature ......................................... +250
y Input Supply Voltage ........................ 2.7V to 5.5V
y Operating Temperature................. -40to +85
Electrical Characteristics
Table 3 At TA=25, VIN=3.5V, CIN=1μF, C1=C2=0.47μF, COUT=2.2μF, EN1=EN2=VIN, unless otherwise noted.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
SUPPLY VOLTAGE AND CURRENT
VIN Input voltage range
2.7 5.5 V
1x
IQ Operating quiescent current
1.5x
800 μA
3 mA
ISD Shutdown current
VIN = 3.5V, EN1 = EN2 = 0V
1 μA
CHARGE PUMP STAGE
VOUT
Over-voltage limit
LED unconnected, VIN=4.2V
5.5 V
FOSC Switching frequency
0.6 0.8
1 MHz
ηCP
Charge pump efficiency
VIN = 3.5V, 1.5x mode
93 %
Shutdown temperature
Temperature rising
160
Recovery temperature
Temperature falling
140
CURRENT SINKS
k
ILED to ISET current ratio
EN1=EN2=1, RISET=10K
290 320 350
ΔILED/ILED(min)
ΔILED/ΔVIN
Current matching between any
two outputs2
VLED = 3.5V, TA = 25
Line regulation
2.7V < VIN < 4.3V
0.4 2.0
%
2.0 3.0 4.0 %/V
VISET
Reference voltage for current set
ENABLE 1, ENABLE 2
V (UVLO)
Under-Voltage Lockout
UVLO hysteresis
VIH EN1, EN2 Threshold high
VIL EN1, EN2 Threshold low
FPWM
Frequency range at PWM
EN1 = 1, EN2 = 0
EN1 = 0, EN2 = 1
EN1 = 1, EN2 = 1
Supply voltage falling
VIN = 5.5V
VIN = 2.7V
EN1, EN2 shorted for PWM control
200 mV
400 mV
600 620 640 mV
2.3 V
100 mV
1.6 V
0.4 V
0 5 kHz
YB1313 MRev.1.1
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YB1313
1x/1.5x/2x Charge Pump for White LED Application
Typical Characteristics
VIN=3.6V, CIN=C1=C2=1μF, COUT=2.2μF, unless otherwise noted.
Efficiency vs. Supply Voltage (Full Load)
1.5X Mode Inrush Current 2/3 Load
100
90
80
70
60
50
40
30
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3
Supply Voltage (V)
1.5X Mode, 2/3 Load
EN0/EN1
DC
Coupled
5V/Div
VOUT
DC
Coupled
5V/Div
IIN
DC
Coupled
500mA/Div
Time=500μs/div
1.5X Mode Inrush Current Full Load
VOUT
DC
Coupled
50mV/Div
C2-
DC
Coupled
2V/Div
VDX
DC
Coupled
1V/Div
Time=1μs/div
1.5X Mode, Full Load
EN0/EN1
DC
Coupled
5V/Div
VOUT
DC
Coupled
5V/Div
IIN
DC
Coupled
500mA/Div
Time=500μs/div
VOUT
DC
Coupled
50mV/Div
C2-
DC
Coupled
2V/Div
VDX
DC
Coupled
1V/Div
Time=1μs/div
YB1313 MRev.1.1
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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
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