®
RT8510
43V 4-CH LED Driver
General Description
Features
The RT8510 is a high efficiency driver for white LEDs. It is
designed for LCD panels that employ an array of LEDs as
the lighting source. An integrated switch current mode
boost controller drives four strings in parallel and supports
up to 12 pieces of LED per string. The internal current
sinks support a maximum of ±2% current mismatching
for excellent brightness uniformity in each string of LED.
To provide enough headroom for current sink operation
the boost controller monitors the minimum voltage of
feedback pins and regulates an optimized output voltage
for power efficiency.
Wide Input Voltage : 4.2V to 24V
High Output Voltage : Up to 43V
Adjustable Channel Current : 10mA to 40mA
Channel Current Accuracy : ±3%
Channel Current Matching : ±2%
PWM Dimming Frequency : 120Hz to 30kHz
Adjustable Switching Frequency : 500kHz to 2MHz
Built-In Soft-Start
Disconnects LED in Shutdown
Open Current Sink Detection
Adjustable Over Voltage Protection
Over Temperature Protection
Current Limit Protection
Thin 16-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
UMPC and Notebook Computer Backlight
GPS, Portable DVD Backlight
Pin Configuration
(TOP VIEW)
CH4
CH3
CH2
CH1
The RT8510 has a wide input voltage range from 4.2V to
24V and provide an adjustable 10mA to 40mA LED current.
The internal 200mΩ, 43V power switch with current-mode
control provides cycle-by-cycle over current protection.
The RT8510 also integrates PWM dimming function for
accurate LED current control. The input PWM dimming
frequency can operate from 120Hz to 30kHz without
inducing any inrush current through the LED or inductor.
The switching frequency of the RT8510 is adjustable from
500kHz to 2MHz, allowing the user flexibility between
efficiency and component size.
The RT8510 is available in a WQFN-16L 3x3 package.
16 15 14 13
RT8510
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
1
12
2
11
GND
3
10
17
4
9
5
6
7
OVP
PGND
PGND
LX
8
PWM
EN
VIN
LX
Ordering Information
AGND
COMP
ISET
RT
WQFN-16L 3x3
Note :
Richtek products are :
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Copyright © 2021 Richtek Technology Corporation. All rights reserved.
DS8510-07
December 2021
is a registered trademark of Richtek Technology Corporation.
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1
RT8510
Marking Information
HU= : Product Code
YMDNN : Date Code
HU=YM
DNN
Typical Application Circuit
VOUT
43V MAX
L
10µH
VIN
4.2V to 24V
CIN
10µF
Chip Enable
R2
10
7 VIN
D1
RT8510
ROVP2
2M
LX 8, 9
C2
1µF
COUT
10µF
12
6 EN
OVP
5 PWM
2
COMP
4
RT
3 ISET
CH1 13
14
CH2
CH3 15
R3
10k
C4
1nF
RRT
51k
C3
10nF
:
:
:
:
:
:
:
:
:
: 10 LED String
:
:
ROVP1
62k
100k
PWM Dimming
:
:
:
:
CH4 16
PGND AGND
1
10, 11
RISET
4.75k
Figure 1. General Application Circuit
L
10µH
VBATT
2.7V to 24V
D1
CIN
10µF
7 VIN
5V
Chip Enable
RT8510
C2
1µF
LX 8, 9
PWM Dimming
R3
10k
C3
10nF
RRT
51k
RISET
4.75k
ROVP2
2M
12
6 EN
OVP
5 PWM
2
COMP
4
RT
3 ISET
CH1 13
14
CH2
CH3 15
COUT
10µF
:
:
:
:
:
:
:
:
:
:
:
:
:
: 10 LED String
:
:
ROVP1
62k
100k
C4
1nF
VOUT
23V MAX
(VOUT depends on DMAX)
CH4 16
PGND AGND
1
10, 11
Figure 2. Low Input Voltage Application Circuit
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RT8510
Functional Pin Description
Pin No.
Pin Name
1
AGND
2
COMP
3
ISET
Pin Function
Analog ground of LED driver.
Compensation pin for error amplifier. Connect a compensation network to
ground.
LED current set pin. LED current is set by the value of the resistor RISET
connected from the ISET pin to ground. Do not short the ISET pin. VISET is
typically 0.6V.
ILED =
95
RISET
Frequency adjust pin. This pin allows setting the switching frequency with a
resistor to 500kHz to 2MHz.
Dimming control input.
4
RT
5
PWM
6
EN
Chip enable (Active High). Note that this pin is high impedance. There should be
a pull low 100k resistor connected to GND when the control signal is floating.
7
VIN
Power supply input.
8, 9
10, 11
12
13, 14, 15, 16
LX
Switching pin of boost converter.
PGND
Power ground of boost converter.
OVP
Sense input for over voltage protection. The detecting threshold is 1.2V.
CH1 to CH 4 Current sink for LED. Leave the pin unconnected, if not used.
17 (Exposed Pad) GND
The exposed pad must be soldered to a large PCB and connected to GND for
maximum power dissipation.
Functional Block Diagram
OVP
LX
EN
VIN
+
1.2
-
RT
OSC
S
Q
R
Q
Regulator
OCP
OTP
PWM
Controller
+
PGND
+
EA
-
COMP
0.4V
LED
Detection
PWM
4
CH1
CH2
CH3
CH4
+
+
-
-
+
:
:
+
0.6V
-
-
ISET
AGND
Copyright © 2021 Richtek Technology Corporation. All rights reserved.
DS8510-07
December 2021
is a registered trademark of Richtek Technology Corporation.
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RT8510
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage to GND ------------------------------------------------------------------------------------------EN, PWM, ISET, COMP, RT to GND --------------------------------------------------------------------------------LX, OVP, CH1, CH2, CH3, CH4 to GND ----------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C
WQFN-16L 3x3 -----------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2)
WQFN-16L 3x3, θJA ------------------------------------------------------------------------------------------------------WQFN-16L 3x3, θJC -----------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3)
HBM -------------------------------------------------------------------------------------------------------------------------MM ----------------------------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
−0.3V to 26.5V
−0.3V to 26.5V
−0.3V to 48V
1.471W
68°C/W
7.5°C/W
260°C
150°C
−65°C to 150°C
2kV
200V
(Note 4)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------------ 4.2V to 24V
Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 4.5V, TA = 25°C unless otherwise specified)
Parameter
Symbol
VIN Quiescent Current
IQ
VIN Shutdown Current
ISHDN
VIN Under Voltage Lockout
UVLO
Test Conditions
Min
Typ
Max
VCOMP = 0V, no switching
0.7
1
1.5
VCOMP = 2V, switching
1.6
2
3
VIN = 4.5V, EN = 0V
0.01
--
10
Rising
2.07
2.3
2.53
Falling
1.98
2.2
2.42
2
--
--
--
--
0.8
Unit
mA
A
V
Control Input
EN Threshold
Voltage
Logic-High VIH
PWM Threshold
Logic-High VIH
Voltage
Logic-Low VIL
Logic-Low VIL
VIN = 4.2V to 24V
V
1.5
VIN = 4.2V to 24V
0.6
PWM Dimming Frequency
f PWM
120
--
30k
Hz
EN, PWM Leakage Current
ILKG
2
--
6
A
EN Shutdown Delay
tEN
RRT = 51k
28
32
36
ms
RRT = 25k
1.65
1.94
2.23
RRT = 51k
0.94
1.1
1.27
RRT = 102k
0.48
0.57
0.66
Boost Converter
Switching Frequency
fOSC
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MHz
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RT8510
Parameter
Symbol
Test Conditions
LX On Resistance (N-MOSFET) RDS(ON)_N VIN > 4.5V
Minimum ON Time
tMON
Maximum Duty
DMAX
LX Current Limit
ILIM
VCOMP = 2V, switching
Min
Typ
Max
Unit
0.18
0.25
0.33
59
90
121
ns
85
90
95
%
1.5
2
2.7
A
-2
--
2
%
3
%
LED Current Programming
LED Current Matching
ILEDM
LED Current Accuracy
ILEDA
ISET Pin Voltage
VISET
LED Current
ICHx
2V > CHx > 0.4V calculating
(I(MAX) I(AVG)) / I(AVG) x 100%,
RISET = 4.75k
2V > CHx > 0.4V calculating
(ICH ISET) / ISET x 100%,
RISET = 4.75k
2V > CHx > 0.4V, RISET = 4.75k
-3
0.56
0.6
0.64
V
19.4
20
20.6
mA
Fault Protection
OVP Threshold
VOVP
1.16
1.2
1.24
V
OVP Fail Threshold
VOVPF
33
55
77
mV
145
160
175
°C
Thermal Shutdown Temperature TSD
LED Pin Under Voltage
Threshold
VLSD
No connection
18
60
100
mV
Regulated VCHx
VCHx
Highest LED string voltage,
RISET = 4.75k
0.3
0.4
0.5
V
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may
affect device reliability.
Note 2. θJA is measured under natural convection (still air) at TA = 25°C with the component mounted on a high effectivethermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. θJC is measured at the
exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Guaranteed by design; not subject to production testing.
Copyright © 2021 Richtek Technology Corporation. All rights reserved.
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RT8510
Typical Operating Characteristics
LED Current vs. Input Voltage
Efficiency vs. Input Voltage
26
100
90
24
LED Current (mA)
Efficiency (%)
80
70
60
50
40
30
20
22
20
CH1
CH2
CH3
CH4
18
16
10
fOSC = 1MHz
10 x 4 LEDs, fOSC = 1MHz
14
0
4
8
12
16
20
4
24
9
14
LED Current vs. Temperature
24
VISET vs. Temperature
26
0.70
24
0.65
22
0.60
VISET (V)
LED Current (mA)
19
Input Voltage (V)
Input Voltage (V)
20
0.55
18
0.50
16
0.45
VIN = 12V, fOSC = 1MHz
VIN = 12V, fOSC = 1MHz
0.40
14
-50
-25
0
25
50
75
100
-50
125
-25
0
Temperature (°C)
25
50
75
100
125
Temperature (°C)
VISET vs. Input Voltage
LED Current vs. PWM Duty Cycle
90
0.8
80
LED Current (mA)
VISET (V)
0.7
0.6
0.5
70
60
50
PWM = 30kHz
PWM = 10kHz
PWM = 1kHz
PWM = 120Hz
40
30
20
0.4
10
fOSC = 1MHz
0.3
10 x 4 LEDs, fOSC = 1MHz
0
4
8
12
16
20
Input Voltage (V)
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24
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
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RT8510
OVP Threshold vs. Input Voltage
Switch Off Current vs. Temperature
1.5
Switch Off Current (mA)
1.5
OVP Threshold (V)
1.4
1.3
1.2
1.1
1.3
1.1
0.9
0.7
fOSC = 1MHz, VIN = 4.5V
fOSC = 1MHz
0.5
1.0
4
8
12
16
20
-50
24
Input Voltage (V)
VIN
(2V/Div)
IOUT
(50mA/Div)
IOUT
(50mA/Div)
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25
50
75
100
125
Line Transient Response
VIN
(5V/Div)
Time (50ms/Div)
0
Temperature (°C)
Line Transient Response
VIN = 11V to 14V, fOSC = 1MHz
-25
VIN = 4.5V to 5.5V, fOSC = 1MHz
Time (50ms/Div)
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RT8510
Application Information
The RT8510 is a general purpose 4-CH LED driver capable
of delivering an adjustable 10 to 40mA LED current. The
CLK
IC is a current mode boost converter integrated with a
43V/2A power switch and can cover a wide VIN range from Output of PWM
Comparator
4.2V to 24V. The switching frequency is adjustable by an
PWM
external resistor from 500kHz to 2MHz. The part
Pulse
integrates built-in soft start, with PWM dimming control;
moreover, it provides over voltage, over temperature and
current limiting protection features.
Soft-Start
The RT8510 equips a built-in soft-start feature to prevent
high inrush current during start-up. The soft-start function
prevents excessive input current and input voltage droop
during power on state.
Compensation
The control loop can be compensates by adjusting the
external components connected to the COMP pin. The
COMP pin is the output of the internal error amplifier. The
compensation capacitors, C3 and C4, will adjust the
integrator zero and pole respectively to maintain stability.
Moreover, the resistor, R3, will adjust the frequency
integrator gain for fast transient response.
T2
T1
Normal
Operation
T4
T3
Normal
Operation
Pulse
Skipped
Normal
Operation
Figure 3. Pulse Skip Mode
Setting and Regulation of LED Current
The LED current can be calculated by the following
equation :
ILED
95
RISET
where RISET is the resistor between the ISET pin and GND.
This setting is the reference for the LED current at channel
1-4 and represents the sensed LED current for each string.
The DC/DC converter regulates the LED current according
to RISET.
Power Sequence
LED Driver is without power sequence concern. Figure 4,
Figure 5 and Figure 6 are different power sequences
respectively. There is no concern in the above condition.
Switching Frequency
The LED driver switching frequency is able to adjusted as
the following equation :
51k
fOSC
(MHz)
RRT
LED Connection
The RT8510 equips 4-CH LED divers with each channel
supporting up to 12 LEDs. The LED strings are connected
from the output of the boost converter to pins 13, 14, 15
and 16 respectively. If one of the LED channel is not used,
the LED pin should be opened directly.
VIN
VOUT
EN
1ms
PWM
Power On Mode 1
Figure 4
Light Load Mode
When the input voltage is close to the output voltage,
VOUT ripple will increase. The VOUT should be set at higher
than 1.2 x VIN. If duty pulse is close to minimum on-time
and smaller than 120ns, the duty pulse will be skipped.
Figure 3 shows the timing diagram with skipped pulse.
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RT8510
Over Voltage Protection
VIN
The RT8510 integrates over voltage protection (OVP)
function. When the voltage at the OVP pin reaches the
threshold voltage, the internal switch will be turned off.
The internal switch will be turned on again once the voltage
at OVP pin drops below its threshold voltage.
VOUT
EN
PWM
Power Off Mode 1-1
VIN
The OVP threshold voltage is adjustable and can be
clamped at a certain voltage level and it can be calculated
by the following equation :
R
VOUT(OVP) VOVP 1 OVP2
ROVP1
VOUT
where VOVP = 1.2V (typ.).
EN
PWM
Power Off Mode 1-2
Figure 5
ROVP1 and ROVP2 are the resistors in the voltage divider
connected to the OVP pin. If at least one string is in normal
operation, the controller will automatically ignore the open
strings and continue to regulate the current for the strings
in normal operation. It is suggested to use 2MΩ for ROVP2
to reduce loading effect.
Current Limit Protection
VIN
UVLO
VOUT
EN
1ms
PWM
Power On Mode 2
The RT8510 can limit the peak current to achieve over
current protection. The RT8510 senses the inductor
current during the “ON” period that flows through the LX
pin. The duty cycle depends on the current signal and
internal slope compensation in comparison with the error
signal. The internal switch will be turned off when the
current signal is larger than the internal slope
compensation. In the “OFF” period, the inductor current
will be decreased until the internal switch is turned on by
the oscillator.
VIN
UVLO
VOUT
EN
PWM
Power On Mode 2
Figure 6
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December 2021
Brightness Control
The RT8510 brightness dimming control is determined by
the signal on the PWM pin with a suggested PWM
frequency range from 120Hz to 30kHz. However, the LED
current cannot be 100% proportional to duty cycle
especially for high frequency and low duty ratio because
of physical limitation caused by inductor rising time. Please
refer to Table 1 and Figure 7.
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RT8510
Table 1.
Dimming Frequency (Hz)
120 < f PWM 500
500 < f PWM 1k
Duty (Min.)
0.2%
0.4%
Duty (Max.)
100%
100%
0.8%
1.5%
3%
10%
100%
100%
100%
100%
1k < f PWM 2k
2k < f PWM 5k
5k < f PWM 10k
10k < fPWM 30k
Note : The minimum duty in Table 1 is based on the application
circuit and does not consider the deviation of current linearity.
LED Current vs. PWM Duty Cycle
90
The boost converter operates in DCM over the entire input
voltage range when the inductor value is below this value
L. When inductance greater is than L, the converter
operates in CCM at the minimum input voltage and may
be discontinuous at higher voltages.
The inductor must be selected with a saturated current
rating that is greater than the peak current provided by
the following equation :
IPEAK
80
LED Current (mA)
where VOUT is the maximum output voltage, VIN is the
minimum input voltage, fOSC is the operating frequency
and IOUT is the total current from all LED strings.
70
VOUT IOUT VIN D T
2L
VIN
where η is the efficiency of the power converter and T is
the operating period.
60
50
PWM = 30kHz
PWM = 10kHz
PWM = 1kHz
PWM = 120Hz
40
30
20
10
VIN = 12V, VPWM = 0V to 3V
0
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
Figure 7
Diode Selection
Schottky diodes are recommended for most applications
because of their fast recovery time and low forward voltage.
The power dissipation, reverse voltage rating and pulsating
peak current are the important parameters for Schottky
diode selection. Make sure that the diode's peak current
rating exceeds IPEAK and reverse voltage rating exceeds
the maximum output voltage.
Output Capacitor Selection
Over Temperature Protection
The RT8510 has over temperature protection function to
prevent the IC from overheating due to excessive power
dissipation. The OTP function will shutdown the IC when
junction temperature exceeds 160°C .
Inductor Selection
The value of the inductance L can be approximated by the
following equation, where the transition is from
discontinuous conduction mode (DCM) to continuous
conduction mode (CCM) :
L
D (1 D)2 VOUT
2 fOSC IOUT
The duty cycle can be calculated according to the following
equation :
V
VIN
D OUT
VOUT
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The input capacitor reduces current spikes from the input
supply and minimizes noise injection to the converter. For
most applications, a 10μF ceramic capacitor is sufficient.
A value higher or lower may be used depending on the
noise level from the input supply and the input current to
the converter.
For lower output voltage ripple, a low ESR ceramic
capacitor is recommended. The output voltage ripple
consists of two components: one is the pulsating output
ripple current flowing through the ESR, and the other is
VRIPPLE VRIPPLE_ESR VRIPPLE_C
V
VIN1
I
IPEAK RESR PEAK AVDD
COUT1 VAVDD f
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RT8510
Thermal Considerations
Layout Considerations
The junction temperature should never exceed the
absolute maximum junction temperature TJ(MAX), listed
under Absolute Maximum Ratings, to avoid permanent
damage to the device. The maximum allowable power
dissipation depends on the thermal resistance of the IC
package, the PCB layout, the rate of surrounding airflow,
and the difference between the junction and ambient
temperatures. The maximum power dissipation can be
calculated using the following formula :
PCB layout is very important for designing switching power
converter circuits. The following layout guides should be
strictly followed for best performance of the RT8510.
The power components, L1, D1, CIN, COUT must be
placed as close as possible to reduce current loop. The
PCB trace between power components must be as short
and wide as possible.
Place L1 and D1as close as possible to LX pin . The
trace should be as short and wide as possible.
The compensation circuit should be kept away from
the power loops and should be shielded with a ground
trace to prevent any noise coupling. Place the
compensation components as close as possible to
COMP pin.
The exposed pad of the chip should be connected to
ground plane for thermal consideration.
For continuous operation, the maximum operating junction
temperature indicated under Recommended Operating
Conditions is 125°C. The junction-to-ambient thermal
resistance, θJA, is highly package dependent. For a
WQFN-16L 3x3, the thermal resistance, θJA, is 68°°C/W
on a standard JEDEC 51-7 high effective-thermalconductivity four-layer test board. The maximum power
dissipation at TA = 25°C can be calculated as below :
PD(MAX) = (125°C − 25°C) / (68°C/W) = 1.471W for a
WQFN-16L 3x3 package.
The compensation circuit
should be kept away from the
power loops and should be
shielded with a ground trace
to prevent any noise coupling.
16 15 14 13
GND
C3
R3
C4
AGND
COMP
ISET
RT
1
12
2
Maximum Power Dissipation (W)
1.60
11
GND
3
10
17
4
6
7
9
OVP
PGND
PGND
LX D1
VOUT
8
PWM
EN
VIN
LX
5
The maximum power dissipation depends on the operating
ambient temperature for the fixed TJ(MAX) and the thermal
resistance, θJA. The derating curves in Figure 1 allows
the designer to see the effect of rising ambient temperature
on the maximum power dissipation.
Place the power components
as close as possible. The
traces should be wide and
short especially for the highcurrent loop.
L1
CIN
R2
COUT
C2
GND
+
where TJ(MAX) is the maximum junction temperature, TA is
the ambient temperature, and θJA is the junction-to-ambient
thermal resistance.
CH4
CH3
CH2
CH1
PD(MAX) = (TJ(MAX) − TA) / θJA
VIN
GND
Figure 9. PCB Layout Guide
Four-Layer PCB
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 8. Derating Curve of Maximum Power Dissipation
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RT8510
Outline Dimension
D
SEE DETAIL A
D2
L
1
E
E2
e
b
A
A1
1
1
2
2
DETAIL A
Pin #1 ID and Tie Bar Mark Options
A3
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.700
0.800
0.028
0.031
A1
0.000
0.050
0.000
0.002
A3
0.175
0.250
0.007
0.010
b
0.180
0.300
0.007
0.012
D
2.950
3.050
0.116
0.120
D2
1.300
1.750
0.051
0.069
E
2.950
3.050
0.116
0.120
E2
1.300
1.750
0.051
0.069
e
L
0.500
0.350
0.020
0.450
0.014
0.018
W-Type 16L QFN 3x3 Package
Richtek Technology Corporation
14F, No. 8, Tai Yuen 1st Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
www.richtek.com
12
DS8510-07
December 2021
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