MP24830
4.5V – 90V, Programmable Frequency
White LED Driver
The Future of Analog IC Technology
DESCRIPTION
The MP24830 is a 90V white LED driver
suitable for either step-down or inverting
step-up/down applications. It supports a wide
input range with excellent load and line
regulation. Its programmable current limit
provides customized applications with a wide
power range. Current mode operation provides
a fast transient response and eases loop
stabilization. Fault condition protection includes
thermal shutdown, cycle-by-cycle peak-current
limiting, open-string protection, and output
short-circuit protection.
The MP24830 incorporates both DC and PWM
dimming onto a single control pin. The separate
input reference ground pin allows for direct
enable and/or dimming control for a positive-to-
negative power conversion.
The MP24830 requires a minimal number of
readily-available external components. It is
available in 14-pin SOIC and QFN packages.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Programmable Maximum Output Current
Unique Step-Up/Down Operation (Buck-
Boost Mode)
Wide 4.5V-to-90V Operating Input Range
for Step-Down Applications (Buck Mode)
Adjustable Switching Frequency
Analog and PWM Dimming
0.2V Reference Voltage
10μA Shutdown Mode
No Minimum LED Quantity Required
Stable with Low ESR Output Ceramic
Capacitors
Cycle-by-Cycle Over-Current Protection
Thermal Shutdown Protection
Open-String Protection
Output Short-Circuit Protection
Available in 14-Pin SOIC and QFN
Packages
General LED Illumination
Automotive LED Lighting
LCD Backlight
APPLICATIONS
•
•
•
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For
MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
DIM
EN
C1
C2
3 VDD
BST
13
Rcs
MP24830
5 DIM
6 EN
U1
CS
2
Q1
DR 1
14
SW
LED+
R9
499k
INGND
OVP 8
DIMO 11
12 VSS
FB 10
RSET COMP
9
7
C3
100pF
C4
4.3nF
R3
4.7k
C5
1nF
D1
R10
4 INGND
LED-
Q2
Si4100DY
D2
R6
100k
C9
22pF
R7
MP24830 Rev. 1.02
www.MonolithicPower.com
4/29/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
1
MP24830 — 4.5V–90V, PROGRAMABLE FREQUENCY WHITE LED DRIVER
ORDERING INFORMATION
Part Number
MP24830HS*
MP24830HL**
Package
SOIC-14
QFN-14
Top Marking
MP24830
24830
* For Tape & Reel, add suffix –Z (e.g. MP24830HS–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP24830HS–LF–Z)
** For Tape & Reel, add suffix –Z (e.g. MP24830HL–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP24830HL–LF–Z)
PACKAGE REFERENCE
TOP VIEW
DR
CS
VDD
INGND
DIM
EN
RSET
1
2
3
4
5
6
7
14
13
12
11
10
9
8
DR
1
2
TOP VIEW
14
SW
BST
VSS
DIMO
FB
COMP
OVP
CS
13
SW
BST
VSS
VDD
3
INGND
4
DIM
5
EN
6
12
11
DIMO
10
FB
9
COMP
RSET
7
8
OVP
EXPOSED PAD
ON BACKSIDE
SOIC14
QFN14
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage V
DD
– V
SS
, V
CS
– V
SS
............90V
V
SW
– V
SS
.............................. -0.3V to V
IN
+ 0.3V
V
BST
, V
DR
..............................................V
SW
+ 6V
V
EN
– V
INGND
, V
Dim
– V
INGND
............. -0.3V to +6V
V
INGND
– V
SS
................................... -0.3V to 90V
Other pins – V
SS
............................. -0.3V to +6V
(2)
Continuous Power Dissipation (T
A
= +25°C)
SOIC-14 ....................................................1.4W
QFN-14 ......................................................2.6W
Junction Temperature .............................. 150°C
Lead Temperature ................................... 260°C
Storage Temperature ............... -65°C to +150°C
Thermal Resistance
(4)
θ
JA
θ
JC
SOIC-14 ................................. 86 ...... 38 ... °C/W
QFN-14................................... 49 ...... 10 ... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T
J
(MAX), the junction-to-
ambient thermal resistance
θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX) = (T
J
(MAX)-T
A
)/θ
JA
. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device function is not guaranteed outside of the
recommended operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions
(3)
Supply Voltage V
DD
– V
SS
................ 4.5V to 85V
Operating Junction Temp. (T
J
) -40°C to +125°C
MP24830 Rev. 1.02
www.MonolithicPower.com
4/29/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
2
MP24830 — 4.5V–90V, PROGRAMABLE FREQUENCY WHITE LED DRIVER
ELECTRICAL CHARACTERISTICES
V
IN
= 12V, T
J
= +25°C, all voltages with respect to V
SS
, unless otherwise noted.
Parameters
Feedback Voltage
Feedback Current
Under Voltage Lockout Threshold Rising
Under Voltage Lockout Threshold Hysteresis
Operation Current (Quiescent)
Supply Current (Quiescent) at EN Off
Gate Driver Pull-Up Impedance
Gate Driver Pull-Down Impedance
Gate Driver Output-High to SW
Gate Driver Output-Low to SW
DIMO Source Current
DIMO Sink Current
DIMO Output High
DIMO Output Low
Oscillator Frequency
Min. Oscillator Frequency
Max. Oscillator Frequency
Foldback Frequency
GM of Error Amplifier
Error Amplifier Output Current
Current Sensing Gain
High-Side Current Limit Threshold
Min. Off-Time
Min. On-Time
EN Input Current
EN OFF Threshold (w/Respect to INGND)
EN ON Threshold (w/Respect to INGND)
Min. DIM Threshold
Max. DIM Threshold
LED-Short Threshold for Immediate Latch-
Off
LED Short Delay for Latch-Off
LED Short Threshold
(5)
Thermal Shutdown
Open LED OV Threshold
Open LED OV Hysteresis
Notes:
5) Guaranteed by design.
(5)
Symbol
V
FB
I
FB
V
UVLOTH
V
UVLOHY
I
Q
I
OFF
R
PULL UP
R
PULL Down
V
OH-SW
V
OL-SW
I
DIMOSC
I
DIMOSK
V
DIMOH
V
DIMOL
f
SW
f
SWMIN
f
SWMAX
f
SWFB
GM
I
Oamp
G
CS
V
CLTH
t
OFFMIN
t
ON
I
ENIN
V
ENOFFTH
V
ENONTH
V
DIMTHL
V
DIMTHH
Condition
4.5V
≤
V
IN
≤
90V
V
FB
= 0.22V
Min
0.192
-50
3.7
Typ
0.2
4.1
160
0.8
10
25
7
5.8
0.1
0.05
0.05
5
0.4
215
50
365
30
80
40
20
45
Max
0.208
50
4.4
1.1
23
Units
V
nA
V
mV
mA
μA
Ω
Ω
V
V
A
A
V
V
kHz
kHz
kHz
kHz
μs
μA
V
EN
= 2V, V
FB
= 0.25V
V
EN
=0V
I
DR
=10mA
I
DR
=10mA
5.6
0.3
I
DR
=10mA
I
DR
=10mA
V
FB
= 0.15V,
R
SET
=100kΩ
V
FB
= 0.15V,
R
SET
=380kΩ
V
FB
= 0.15V, R
SET
open
V
FB
= 0V, V
OVP
=0V,
R
SET
=100kΩ
4.6
145
30
245
0.5
265
75
465
mV
ns
ns
μA
V
V
V
V
mV
μs
mV
°C
V
mV
V
FB
= 0.19V,
R
SET
=100kΩ
V
EN
= 3.3V
V
EN
Falling
V
EN
Rising
V
FB
= 0.2V
V
FB
= 0.2V
280
100
3.7
0.4
0.6
1.55
0.7
1.75
600
450
300
160
1.2
50
1.4
0.8
1.95
T
TSHD
V
OVPTH
V
OVPHY
1.1
1.3
MP24830 Rev. 1.02
www.MonolithicPower.com
4/29/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
3
MP24830 — 4.5V–90V, PROGRAMABLE FREQUENCY WHITE LED DRIVER
PIN FUNCTIONS
SOIC14
1
2
3
4
Name Description
DR
CS
Driver Output. Connect it to the high-side MOSFET gate.
High-Side Current Sense. For over-current protection and current-mode control.
Supply Voltage. Operates from a 4.5V-to-85V unregulated input (with respect to VSS). Needs
VDD
C1 to prevent large input voltage spikes.
INGND Input Ground Reference. Reference for the EN/DIM signal.
Dimming Command Input. Selects for DC or PWM dimming. When the DIM pin voltage (with
respect to INGND) rises from 0.6V to 1.95V, the LED current changes from 0% to 100% of the
DIM maximum LED current. For PWM dimming, apply a 100Hz-to-2kHz square wave with an
amplitude greater than 2V. For combined analog and PWM dimming, apply a 100Hz-to-2kHz
square wave signal with amplitude from 0.6V to 1.95V.
EN
Enable.
Frequency Set. Connect a resistor to VSS to set the switching frequency, and a 1nF capacitor
RSET
to VSS to bypass the noise. Leaving this pin open for the 350kHz default operating frequency.
Over-Voltage Protection. Use a voltage divider to program OVP threshold. When the OVP pin
voltage reaches the 1.2V shutdown threshold, the switch turns off and recovers when the OVP
voltage decreases sufficiently. When the OVP pin voltage (with respect to VSS) falls below
OVP
0.4V and the FB pin voltage falls below 0.1V, the chip interprets this as a short circuit and the
operating frequency will fold back. Program the OVP pin voltage from 0.4V to 1.2V for normal
operation.
Error Amplifier Output. Connect a 1nF or larger capacitor on COMP and an RC network from
COMP
FB to COMP to improve the stability and to provide soft-start and PWM dimming.
LED Current Feedback Input. A current-sensing resistor between FB and VSS provides circuit
FB
feedback. The regulation voltage is 0.2V. Short-circuit protection triggers If the FB voltage
exceeds 300mV for 450µs or the FB voltage exceeds 600mV.
DIMO
DIM Output. Provides for accurate PWM diming control following DIM logic. Connect to the
gate of the external dimming MOSFET. Leave floating if dimming accuracy is not a concern.
Power Return. Connect to the circuit’s point of lowest potential, which is typically the anode of
the Schottky rectifier. Acts as the voltage reference for the regulated output voltage, and layout
requires extra consideration. Place this node outside of the D1-to-C1 ground path to prevent
switching current spikes from inducing voltage noise. Connect the exposed pad to this pin.
Bootstrap. Connect a capacitor between the SW and BST pins to form a floating supply across
the power switch driver. Use a 100nF or larger ceramic capacitor to provide sufficient energy
to drive the power switch’s gate above the supply voltage.
Switch. Connect to the source of the external MOSFET
5
6
7
8
9
10
11
12
VSS
13
14
BST
SW
MP24830 Rev. 1.02
www.MonolithicPower.com
4/29/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
4
MP24830 — 4.5V–90V, PROGRAMABLE FREQUENCY WHITE LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
V
EN
=5V, V
IN
=5V to 85V, I
OUT
=0.5A, L=47μH, T
A
=25°C, unless otherwise noted.
Efficiency vs.
Input Voltage
100
95
EFFICIENCY (%)
Efficiency vs.
String Voltage
100
0.6
0.4
V
IN
=40V
92
88
84
80
10
V
IN
=20V
I
LED
REGULATION (%)
I
LED
Line Regulation vs.
V
IN
10LED
6LED
EFFICIENCY (%)
96
90
85
80
75
70
0
20
40
60
80
100
8LED
3LED
0.2
0.0
8LED
-0.2
-0.4
-0.6
10
20
3LED
10LED
6LED
15
20
25
30
35
40
30
40
50
60
70
V
IN
VOLTAGE (V)
LED STRING VOLTAGE (V)
INPUT VOLTAGE (V)
Buck Efficiency vs.
Input Voltage
100
95
EFFICIENCY (%)
Buck Efficiency vs.
String Voltage
100
V
IN
=50V, I
LED
=1A
0.6
0.4
I
LED
REGULATION (%)
I
LED
=1A
6LED
EFFICIENCY (%)
Buck I
LED
Line
Regulation vs. V
IN
2LED, I
LED
=1A
95
90
85
80
75
90
85
80
75
70
0
20
40
60
80
100
2LED
4LED
0.2
0.0
-0.2
-0.4
-0.6
20 30 40 50 60 70 80 90 100
INPUT VOLTAGE (V)
70
5
12
19
26
33
40
V
IN
VOLTAGE (V)
LED STRING VOLTAGE (V)
Buck-Boost I
LED
vs.
PWM Dimming
500
400
I
OUT
CURRENT (A)
Buck I
LED
vs.
PWM Dimming
500
400
I
OUT
CURRENT (A)
Buck-Boost I
LED
vs.
Analog Dimming
1000
800
600
400
200
0
0.7
V
IN
=20V, 3LED, F
DIM
=0.2kHz
V
IN
=25V, 3LED, F
DIM
=0.2kHz
V
IN
=25V, 3LED, F
DIM
=0.2kHz
I
OUT
CURRENT (mA)
300
200
100
0
0
300
200
100
0
20
40
60
80
100
0
20
40
60
80
100
0.9
1.1
1.3
1.5
1.7
1.9
DIMMING (%)
DIMMING (%)
ANALOG DIMMING VOLTAGE (V)
MP24830 Rev. 1.02
www.MonolithicPower.com
4/29/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
5
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