ZYG3361
ZhenYangGroup CO,LTD
STEP-UP DC/DC CONVERTER BACKLIGHT DRIVER
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Features
PDAs and digital cameras etc. Output voltage of up to 30V
Input voltage range : 2.8V-30V.
can be derived, and from a 2.8V input three white LED’s can
Output voltage range : up to 30V.
be driven in series.
Low 200mV feedback voltage.
Luminance of the LED’s is controlled by changing the duty
Oscillation frequency : 1.2MHz.
cycle of a PWM signal applied to the CE pin. In addition, an
On resistance : 0.2Ω.
internal MOSFET with an Rds-on of 0.2Ω is used. Allow profile
Efficiency : 86%.
and small board area solution can be achieved using a chip
Control : PWM control.
coil and an ultra small ceramic output capacitor (CL) of 2.2μF.
Stand-by Current : ISTB=10µA(MAX).
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Applications
Load capacitor : 2.2µF,ceramic.
For White LED Drivers
High Supply Capability: Deliver 10V 500mA from 3.6V supply.
Mobil phones, PHS
Lx limit Current : 1.5A.
PDAs
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General Description
Digital still cameras
The ZYG 3361 is a fixed frequency, constant current
step-up DC/DC converter ideal for driving
LEDs used in backlighting applications on cellular phones,
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Package Information
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ZYG3361
ZhenYangGroup CO,LTD
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Pin Configurations
Pin No.
Pin Name
1
LX
Switch
2
VSS
Ground
3
FB
Voltage Feedback
4
CE
Chip Enable
5
OVP
Over voltage protect
6
VIN
Power Input
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Functional Block Diagram
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Absolute Maximum Ratings
Parameter
Pin Function
Symbol
Ratings
Unit
VIN
VSS-0.3~VSS+32
V
Output Voltage
VOUT
VSS-0.3~VSS+30
V
LX Voltage
VLX
VSS-0.3~VSS+36
V
FB Voltage
VFB
VSS-0.3~VSS+3.6
V
CE Voltage
VCE
VSS-0.3~VIN
V
OVP Voltage
VOVP
VSS-0.3~VSS+36
V
VIN Voltage
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ZYG3361
ZhenYangGroup CO,LTD
LX Current
ILX
1.5
A
Power Dissipation
PD
600
mW
Operating Junction Temperature
TOPR
-25 to +80
℃
Storage Temperature Range
TSTG
-40 to +125
℃
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must
therefore not be exceeded under any conditions.
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Electrical Characteristics (VIN=VCE=3.6V, TA = 25°C, unless otherwise noted.)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
FB Control Voltage
VFB
--
180
200
220
mV
Output Voltage range
VOUT
--
VIN
--
30
V
Lx Operating Voltage range
VLX
--
--
--
36
V
Operating Voltage Range
VIN
--
2.8
--
30
V
Stand-by Current
ISTB
VCE=0,VIN=5V
--
--
10
µA
Oscillation Frequency
FOSC
IOUT=100mA
1
1.2
1.4
MHz
Maximum Duty Cycle
MAXDTY
--
--
88
--
%
Efficiency
EFFI
RLED=10Ω
--
86
--
%
LX Current Limit
ILIMIT
--
--
2
--
A
Overvoltage Protection
VOVP
--
--
30
--
V
RDS(ON)
--
--
200
--
mΩ
ILVL
--
--
0
1
µA
CE’H’ Voltage
VCEH
--
1.5
--
--
V
CE’L’ Voltage
VCEL
--
--
--
0.4
V
Thermal Shutdown
TSD
--
--
150
--
℃
Thermal Hysteresis
THYST
--
--
20
--
℃
--
100
--
10k
Hz
LX On Resistance
LX Leak Current
PWM dimming frequency
Note 1: Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device.These are for stress
ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device
reliability.
Note 2: θ JA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC
51-3 thermal measurement standard. Pin 2 of SOT23-6 packages is the case position for θ JC measurement.
Note 3: The device is not guaranteed to function outside its operating conditions.
Note 4: EN pin voltage must be higher than 1.5V.
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ZYG3361
ZhenYangGroup CO,LTD
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Typical Application Circuit
Design Specifications
Input Voltage (V)
Input Current (A)
5V
0~1.5A
Output Current (A)
Test conditions
0.3A
5PCS LED Series
BOM List
Reference Designator
Description
L
10uH,Inductor
C1
47uF/50V, EC
C2
4.7uF/25V
C3,C4
1 uF/50V
R2
1Ω, 1%, 0603
R3
2Ω, 1%, 0603
R5
0Ω,1%, 0603
R6
1M, 1%, 0603
D1
SS34
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ZhenYangGroup CO,LTD
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ZYG3361
Typical Operating Characteristics
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ZhenYangGroup CO,LTD
ZYG3361
DISCLAIMER
Z HENYANG GROUP CO,LTD RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE
TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. Z HENYANG DOES NOT
ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR
CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT
RIGHTS, NOR THE RIGHTS OF OTHERS.
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