LED Boost Driver with PWM Dimming

LV52205MU
Bi-CMOS IC
LED Boost Driver with PWM
Dimming
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Overview
The LV52205MU is a high voltage boost driver for LED drive. LED
current is set by the external resistor R1 and LED dimming can be done by
changing FB voltage with PWM control.
Feature
 Operating Voltage from 2.7V to 5.5V
 Integrated 42V MOSFET
 PWM dimming for Brightness Control
 600kHz Switching Frequency
UDFN6 2×2, 0.65P
Typical Applications
 LED Display Backlight Control
D1
L1
22μH
VBAT
C1
1μF
C2
1μF
SW
PWM
VIN
PWM
GND
FCAP
FB
LV52205
C3
220nF
R1
10Ω
ORDERING INFORMATION
See detailed ordering and shipping information on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
January 2015 - Rev. 1
1
Publication Order Number :
LV52205MU/D
LV52205MU
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VCC max
VCC
5.5
Maximum pin voltage1
V1 max
SW
42
V
V
Maximum pin voltage2
V2 max
Other pin
5.5
V
Allowable power dissipation
Pd max
Ta = 25C *1
2.05
W
Operating temperature
Topr
-30 to +85
C
Storage temperature
Tstg
-55 to +125
C
*1 Mounted on a specified board: 70mm50mm1.2mm (4 layer glass epoxy)
Caution 1) Absolute maximum ratings represent the values which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
Recommendation Operating Condition at Ta = 25C
Parameter
Symbol
Supply voltage range1
VCC op
PWM frequency
Fpwm
Conditions
Ratings
VCC
Unit
2.7 to 5.5
V
300 to 100k
Hz
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
Electrical Characteristics Analog block at Ta  25C, VCC = 3.6V, unless otherwise specified
Parameter
Symbol
Conditions
Ratings
min
typ
SHUTDOWN
Unit
max
0
5
A
1
mA
0.2
0.21
V
1
A
Standby current dissipation
ICC1
DC/DC current dissipation
ICC2
VOUT = 30V, ILED = 20mA
FB voltage
Vfb
PWM duty 100%
FB pin leak current
Ifb
OVP voltage
Vovp
SW
SWOUT ON resistance
Ron
IL = 100mA
700
m
NMOS switch current limit
ILIM
Vfb = 200mV
0.7
A
OSC frequency
Fosc
High level input voltage
VINH
PWM
1.5
VCC
Low level input voltage
VINL
PWM
0
0.4
Under voltage lockout
Vuvlo
VIN falling
PWM setup time from
Ton
20
us
Toff
8.9
ms
0.19
40
41
42
600
2.2
V
kHz
V
V
V
shutdown
PWM low time to shutdown
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
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2
LV52205MU
Block Diagram
VBAT
4
VCC
SW
6
UVLO
OCP
OVP
600kHz PWM
Controler
TSD
1
PWM
FB
5
FCAP
VREF
CONTROL
VREF
3
2
Pin Connections
FB 1
6 VIN
FCAP 2
5 PWM
GND 3
4 SW
Top view
Pin Function
PIN #
Pin Name
Description
1
FB
Feedback pin.
2
FCAP
Filtering capacitor terminal for PWM signal.
3
GND
Ground
4
SW
Switch pin. Drain of the internal power FET.
5
PWM
PWM dimming input (active High).
6
VCC
Supply voltage.
Expose-pad
Connect to GND on PCB.
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3
GND
LV52205MU
Pd max -- Ta
Allowable power dissipation, Pd max -- W
3.0
Mounted on a specified board: 70×50×1.2mm3
(4 layer glass epoxy)
2.05
2.0
1.0
0.82
0
--30
0
30
60
90
120
Ambient temperature, Ta -- C
LED Current Setting
LED current is set by an external resistor connected between the FB pin and ground.
ILED = VFB/RFB.
The VFB can be controled by PWM signal. PWM input is converted into a near DC current by the internal resistor R
that was equivalent to 60k (±10%) and the external capacitor CFCAP as a low pass filter with a cut-off frequency fc =
1/2πRCFCAP. The VFB can be adjusted by altering the duty cycle of the PWM signal (See Fig.1).
VFB = 200 (mV)  PWM Duty (%)
200
180
160
VFB (mV)
140
120
100
80
60
40
20
0
0
10
20
30
40
50
60
70
80
90
PWM Duty (%)
Fig1. VFB vs. PWM Duty
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4
100
LV52205MU
PWM Control
DC-DC Delay
max = 4.6ms
Ton>20us
Toff > 8.9ms
PWM
Shutdown
PWM Enable
DCDCENH
(IC inside signal)
FB
Max 4ms @ Cfcap = 22nF
(T.C.= 60k * Cfcap)
FCAP
The time until stable movement max = 8.6ms
Fig2.Timing Diagram in PWM signal
Open LED Protection
If SW terminal voltage exceeds a threshold Vovp (41V typ) for 8 cycles, boost converter enters shutdown mode. In
order to restart the IC, PWM setup signal is required again.
Over Current Protection
Current limit value for built-in power MOS is around 0.7A. The power MOS is turned off for each switching cycle when
peak current through it exceeds the limit value.
Under Voltage Lock Out (UVLO)
UVLO operation works when VIN terminal voltage is below 2.2V.
Thermal Shutdown
When chip temperature is too high, boost converter is stopped.
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LV52205MU
Application Circuit Diagram
10LEDs
D1
L1
22μH
VBAT
C1
1μF
C2
1μF
4
SW
GND
3
5
PWM
FCAP
2
VIN
FB
1
6
PWM
C3
220nF
R1
10Ω
L1: VLS3012T-220M49 (TDK), VLF504015MT-220M (TDK)
D1: MBR0540T1 (ONsemi), NSR05F40 (ONsemi)
C2: GRM21BR71H105K (Murata), C1608X5R1H105K (TDK)
6LEDs
D1
L1
10μH
VBAT
C1
1μF
C2
1μF
4
SW
GND
3
5
PWM
FCAP
2
VIN
FB
1
6
PWM
C3
220nF
R1
10Ω
L1: VLS3012T-100M72 (TDK), VLF302512M-100M (TDK)
D1: MBR0540T1 (ONsemi), NSR05F40 (ONsemi)
C2: GRM21BR71H105K (Murata), C1608X5R1H105K (TDK)
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LV52205MU
Typical Characteristics (VIN = 3.6V, L = 22H, T = 25C, unless otherwise specified)
Efficiency -- Output current
100
Efficiency -- Output current
100
VIN=3.8V
10LED
90
90
4.2V
80
11LED
10LED
Efficency -- %
Efficency -- %
8LED
70
60
3.0V
3.6V
70
60
50
50
40
80
0
5
10
15
40
20
5
0
10
LED current -- mA
FB voltage -- PWM duty
200
15
20
LED current -- mA
FB voltage -- Temperature
200
Duty=100%
180
160
FB voltage -- mV
FB voltage -- mV
150
100
140
120
Duty=50%
100
80
60
50
40
Duty=10%
20
0
0
10
20
30
40
50
60
70
80
90
0
--30
100
--15
0
15
LED current -- PWM frequency
60
75
90
0.8
75%
15
LED current -- mA
45
50%
10
VIN current - Temperature
1
ICC -- mA
20
30
Temperature -- °C
PWM duty -- %
0.6
0.4
25%
5
0.2
0
0.1
1
10
0
- 40
100
- 20
PWM frequency -- kHz
0
20
40
60
80
100
Temperature -- °C
OVP voltage - Temperature
2.40
UVLO voltage - Temperature
43
2.35
UVLO voltage - V
OVP voltage - V
42
41
40
39
2.30
2.25
2.20
38
2.15
37
36
- 40
- 20
0
20
40
60
80
2.10
100
Temperature -- °C
- 40
- 20
0
20
40
Temperature -- °C
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7
60
80
100
LV52205MU
PACKAGE DIMENSIONS
UDFN6 2x2, 0.65P
CASE 517AB
D
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
A
B
DIM
A
A1
A3
b
D
D2
E
E2
e
K
L
E
PIN ONE
REFERENCE
0.10 C
2X
0.10 C
2X
A3
SOLDERING FOOTPRINT*
0.10 C
6X
A
6X
0.08 C
MILLIMETERS
MIN
MAX
0.45
0.55
0.00
0.05
0.127 REF
0.25
0.35
2.00 BSC
1.50
1.70
2.00 BSC
0.80
1.00
0.65 BSC
0.20
--0.25
0.35
0.47
0.95
6X
A1
C
0.40
1
SEATING
PLANE
D2
6X
e
L
4X
1.70
3
1
E2
2.30
6X
6
K
4
6X
BOTTOM VIEW
b
0.10 C A B
0.05 C
DIMENSIONS: MILLIMETERS
*For additional information on our Pb-Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
LV52205MU is as follows.
MARKING DIAGRAM
1
0.65
PITCH
T5M
T5
M
= Device Code
= Date Code
= Pb−Free Package
(Note: Microdot may be in either location)
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LV52205MU
Packing Specification of Embossed Carrier Taping
UDFN6 (2.0×2.0) 3,000 pcs/reel
.EMBOSSED CARRIER TAPING
-
.Embossed carrier tape dimensions
Embossment
Sprocket hole
Unit• Fmm
-
.Tape mounting direction
Reel
Embossed Carrier tape
Index mark
Direction of unreeling
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LV52205MU
.TAPE STRENGTH
-
.Tensile strength of the carrier tape
-
.Peel strength of the top cover tape
(
)Peel angle
(
)Peel rate
(
)Peel of strength
Min.10N
165 to 180 relative to the tape adhesive surface
300mm / minute
0.1N to 1.0N
.PARTS No. ON BAR CODE LABEL
Type number
T
B
G
LEAD FREE symbol
Direction indication
.REEL DIMENSIONS
1.6 MIN
10.9 MAX
TYPE:P-RRM-08B
UNIT:mm
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10
LV52205MU
Carrier tape type number
N22986D001
SANYO Package code
Maximum number of ICs contained (pcs.)
Reel
Inner box
3,000
30,000
Packing form
Inner box. B50766P001
10 Reels contained
UDFN6(2.0*2.0)
Dimensions:mm
190 136 186
MPN Label
HOURS:UNLIMITED
Packing Method
Inner box
Direction of unreeling
MPN Label
Put 10 Reel into Inner box
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11
Fix by tape
MPN Sticher
1
LV52205MU
ORDERING INFORMATION
Device
LV52205MUTBG
Package
UDFN6 (2x2)
(Pb-Free)
Shipping (Qty / Packing)
3000 / Tape & Reel
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further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose,
nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including
without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can
and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are
not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or
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directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was
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