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Preliminary YB1315
High Efficiency Charge Pump White LED Driver
Description
The YB1315 charge pump is designed to
drive up to 5 white LEDs with regulated
constant current in backlight display
application. The device can provide up to
25mA per LED for a total 5 channels. The
output current can also be combined into
one single channel with 125mA output
current for flash-light applications. 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.
YB1315 monitors the power-supply input
voltage and LED forward voltage and
current, and does an automatic selection to
a switching mode that is optimized for the
power conversion efficiency as well as
battery operating time. The 1MHz fixed
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. YB1315 also
provides short circuit protection,
over-temperature
protection
and
over-voltage protection. In shutdown mode,
the shutdown current is less than 1μA.
YB1315 is available in a TQFN-16 3x3
package.
Features
„ Voltage Input Range From 2.7V to 5.5V
„ Drives From 3 to 5 LEDs at Up to 25mA
Each
„ Fractional Conversion Modes for High
Conversion Efficiency, 1x and 1.5x
„ 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
„ 3mm x 3mm TQFN Package
Applications
„ White LED Backlighting
„ Handheld PCs and PDAs
„ Mobile Phone
„ DSC and DV flash light application
Typical Application Circuit
VIN = 2.7V
to 5.5V
1µF
0. 47µF
0. 47µF
VIN VOUT
C1+ D1
C1- D2
C2+ D3
YB1315
C2- D4
EN1 D5
EN2
GND
ISET
PGND
1uF
YB1315 Rev.0.1
Figure 1: Typical Application Circuit
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Pin Configuration
Preliminary YB1315
High Efficiency Charge Pump White LED Driver
12 11 10
13
VIN
14
GND
15
EN1
16
EN2
1234
9
VOUT
8
PGND
7
D1
6
D2
5
TQFN-16 3x3
Pin Description
Figure 2: Pin Configuration
Table 1
Pin Name
1 ISET
2 D5
3 D4
4 D3
5 D2
6 D1
7 PGND
Description
Connect a RSET resistor between this pin and GND. RSET=7.5K, set ILED to 20mA.
(Recommended)
Current sink output #5. If not used, connected to VIN or floating.
Current sink output #4. If not used, connected to VIN or floating.
Current sink output #3. If not used, connected to VIN or floating.
Current sink output #2. If not used, connected to VIN or floating.
Current sink output #1. If not used, connected to VIN or floating.
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.
16
EN2
Enable input2. EN1 and EN2 can be used for digital dimming with 4 steps from 0mA to
the maximum current set with ISET.
Ordering Information
Table 2
Order Number
Package Type
YB1315A316
TQFN-16 3x3
Supplied As
2500 Units Tape & Reel
Package Marking
Please contact sales
representative
YB1315 Rev.0.1
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Preliminary YB1315
High Efficiency Charge Pump White LED Driver
Absolute Maximum Ratings
Recommended Operating Conditions
Supply Voltage.......................................5.5V
Output Short-Circuit Duration...... Continuous
Junction Temperature Range...............150
Storage Temperature Range.. -65to 150
Lead Temperature................................250
Input Supply Voltage............... 2.7V to 5.5V
Operating Temperature..........-40to 85
Electrical Characteristics
Table 3 (VIN=3.6V, EN1=EN2=VIN, TA=25°C, unless otherwise noted.)
Description
Symbol
Test Conditions
SUPPLY VOLTAGE AND CURRENT
Input Voltage Range
VIN IOUT = 0~70mA
Operating Quiescent Current
VIN =4.2V, x1-mode,
IQ EN1=EN2=1, ISET =20μA
IOUT = 0mA, x1.5-mode
Shutdown Current
CHARGE PUMP STAGE
ISD EN1=EN2=GND
Over Voltage Limit
VOUT LED1 unconnected, VIN =4.2V
Startup Time
Softstart Duration
COUT =1μF, IDX 0.9IDX
Switching Frequency
f
Efficiency
Shutdown Temperature
Shutdown Temperature Hysteresis
CURRENT SINKS
η
VIN =3.75V, ILED=20mA each
VDX =3.2V
Recommended Maximum Current Per
Current Sink
IDX 3.2VVIN5.5V
Current into Each Current Sink when
ISET is Shorted to GND
Current Matching Between Any Two
Outputs
IDX
3.0VVIN5.5V
ISET short to GND
VDX =3.2V, TA =25
Line Regulation
Reference Voltage for Current Set
Recommended ISET Pin Current Range
IDX to ISET Current Ratio
Voltage at Dx to GND
VISET
ISET
k
VSOURCE
3.2VVIN5.5V, VDX =3.2V
EN1=EN2=1, ISET =80μA
EN2=0, EN1=1
EN2=1, EN1=0
EN2=1, EN1=1
EN2=1, EN1=1, ISET =80μA
MIN
2.7
0.7
580
4
220
TYP MAX Units
5.5
250
2
0.1 1
V
μA
mA
μA
5.3 V
750 μs
500 μs
1 1.3 MHz
83 %
160
20
25 mA
60 mA
±3 %
±3
200
400
600 620
100
250 280
0.4
%
mV
μA
V
YB1315 Rev.0.1
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