MP2410AGJE [MPS]

24V, 2A, 1MHz, Synchronous, Step-Down, LED Driver;
MP2410AGJE
型号: MP2410AGJE
厂家: MONOLITHIC POWER SYSTEMS    MONOLITHIC POWER SYSTEMS
描述:

24V, 2A, 1MHz, Synchronous, Step-Down, LED Driver

文件: 总17页 (文件大小:1075K)
中文:  中文翻译
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MP2410A  
24V, 2A, 1MHz, Synchronous,  
Step-Down, LED Driver  
DESCRIPTION  
FEATURES  
4.2V to 24V Wide Input Range  
Synchronous Step-Down Converter  
100mΩ Internal High-Side Power MOSFET  
80mΩ Internal Low-Side Synchronous  
Rectifier  
Peak Current Mode Control  
Up to 2A Continuous Output Current  
100mV Feedback Voltage  
Up to 97% Efficiency  
Fixed 1MHz Switching Frequency  
Analog and PWM Dimming  
Cycle-by-Cycle Current Limit  
Inherent LED Open Protection  
Output Short-Circuit Protection (SCP)  
NTC Thermal Protection  
The MP2410A is a 24V, monolithic, synchronous,  
step-down, white LED driver with a built-in power  
MOSFET and rectifier. It achieves up to 2A of  
continuous output current with excellent load and  
line regulation. Peak current mode operation  
provides fast transient response and eases loop  
stabilization.  
The MP2410A incorporates both analog and  
PWM dimming onto a single control pin. The  
MP2410A implements deep analog dimming and  
PWM dimming.  
Full protection features include cycle-by-cycle  
peak-current  
limiting,  
output  
short-circuit  
protection (SCP), open LED protection, NTC  
thermal protection, and thermal shutdown.  
Thermal Shutdown  
Auto-Restart Function  
Available in TSOT23-6 and TSOT23-8  
Packages  
The MP2410A requires a minimum number of  
readily available, standard, external components  
and is available in TSOT23-6 and TSOT23-8  
packages.  
APPLICATIONS  
Infrared LED Driver  
General LED Driver  
Flashlight  
Handheld Computers Backlight  
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.  
For MPS green status, please visit the MPS website under Quality  
Assurance. “MPS” and “The Future of Analog IC Technology” are registered  
trademarks of Monolithic Power Systems, Inc.  
TYPICAL APPLICATION  
VIN  
IN  
BST  
SW  
FB  
L1  
C2  
C1  
MP2410A  
EN/DIM  
GND  
Max  
2A  
OFF ON  
C3  
R1  
R2  
50mΩ  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
1
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
ORDERING INFORMATION  
Part Number  
Package  
Top Marking  
MP2410AGJ*  
MP2410AGJE**  
TSOT23-6  
TSOT23-8  
See Below  
* For Tape & Reel, add suffix Z (e.g. MP2410AGJZ)  
** For Tape & Reel, add suffix Z (e.g. MP2410AGJEZ)  
TOP MARKING (TSOT23-6)  
ARX: Product code of MP2410AGJ  
Y: Year code  
TOP MARKING (TSOT23-8)  
ARV: Product code of MP2410AGJE  
Y: Year code  
PACKAGE REFERENCE  
TOP VIEW  
TOP VIEW  
TSOT23-6  
TSOT23-8  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
2
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
ABSOLUTE MAXIMUM RATINGS (1)  
Supply voltage (VIN) .....................................26V  
VSW .......................................-0.3V to VIN + 0.3V  
VBST .....................................................VSW + 6V  
All other pins.................................. -0.3V to +6V  
Thermal Resistance (4)  
TSOT23-6..............................100 .....55 ...°C/W  
θJA θJC  
TSOT23-8..............................100 .....55 ...°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 TJ (MAX), the junction-to-  
ambient thermal resistance θJA, and the ambient temperature  
TA. The maximum allowable continuous power dissipation at  
any ambient temperature is calculated by PD (MAX) = (TJ  
(MAX)-TA)/θJA. Exceeding the maximum allowable power  
dissipation produces an excessive die temperature, causing  
the regulator to go into thermal shutdown. Internal thermal  
shutdown circuitry protects the device from permanent  
damage.  
(2)  
Continuous power dissipation (TA = 25°C)  
TSOT23-6................................................1.25W  
TSOT23-8................................................1.25W  
Junction temperature...............................150°C  
Lead temperature ....................................260°C  
Storage temperature................-65°C to +150°C  
ESD capability human body mode ............2.0kV  
3) The device is not guaranteed to function outside of its  
operating conditions.  
4) Measured on JESD51-7, 4-layer PCB.  
Recommended Operating Conditions (3)  
Supply voltage (VIN) ........................ 4.2V to 24V  
Operating junction temp. (TJ)…..-40°C to 125°C  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
3
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE  
ELECTRICAL CHARACTERISTICS  
Typical values are VIN = 12V, TJ = 25°C, unless otherwise noted. Minimum and maximum values  
are at VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted, guaranteed by characterization.  
Parameters  
Symbol  
Condition  
Min  
Typ  
Max  
Units  
Supply Voltage  
Operating range  
Turn on threshold  
Hysteretic voltage  
VIN  
VIN_ON  
VIN_HYS  
After turn on  
VIN rising edge  
4.2  
3.5  
24  
4
V
V
V
3.7  
0.12  
Supply Current  
Shutdown current  
Quiescent current  
ISD  
IQ  
VEN = 0V  
VEN = 2V, VFB = 200mV  
10  
0.9  
50  
1.1  
μA  
mA  
Enable and Dimming (EN/DIM)  
EN/DIM off threshold  
EN/DIM on threshold  
Turn off delay time  
EN/DIM pull-up current  
Max analog dimming threshold  
Min analog dimming threshold  
Feedback (FB)  
VEN_OFF  
VEN_ON  
tOFF_DELAY  
IEN/DIM  
VADIM_MAX  
VADIM_MIN  
VEN/DIM falling edge  
VEN/DIM rising edge  
0.27  
0.545  
16  
2.8  
1.31  
0.63  
0.31  
0.59  
22  
3.8  
1.44  
0.7  
0.35  
0.635  
28  
5.3  
1.57  
0.78  
V
V
ms  
μA  
V
VEN = 0V  
Theoretically, VFB = 100mV  
VFB = 5mV  
V
Feedback voltage  
Feedback current  
VFB  
IFB  
93  
100  
30  
107  
75  
mV  
nA  
4.2V VIN 24V  
VFB = 150mV  
Power Switch  
VIN = 5.0V  
VIN = 4.2V  
VIN = 5.0V  
VIN = 4.2V  
VEN = 0V, VSW = 0V  
When high-side switch  
turns on  
When low-side switch turns  
on  
100  
110  
80  
170  
180  
140  
150  
1
mΩ  
mΩ  
mΩ  
mΩ  
μA  
High-side MOSFET on  
resistance  
Low-side synchronous rectifier  
switch on resistance  
Switch leakage  
RDS(ON)_H  
RDS(ON)_L  
ISW_LKG  
ILIMIT_H  
90  
High-side current limit  
Low-side current limit  
OCP current threshold  
3.5  
-890  
3.6  
5
6.6  
A
mA  
A
ILIMIT_L  
IOCP  
-630  
5.5  
-330  
Both for high side and low  
side  
7
Oscillator frequency  
Maximum duty cycle  
Minimum on time  
Restart Timer  
fSW  
DMAX  
tON_MIN  
VFB = 80mV  
VFB = 80mV  
0.8  
90  
1
94  
70  
1.2  
MHz  
%
ns  
Hiccup timer at fault condition  
Bootstrap  
tSTART  
2.4  
5.1  
ms  
5.5V VIN 24V  
VIN = 4.2V  
4.8  
3.6  
5.5  
V
V
Bias voltage for high-side driver  
VBST-VSW  
NTC  
High-threshold voltage  
Low-threshold voltage  
Shutdown threshold  
Shutdown voltage hysteresis  
Pull-up current source  
Leakage current  
VH_NTC  
VL_NTC  
VSD_NTC  
VSD_NTC_HYS  
IPULL_UP_NTC  
INTC_LKG  
VFB = 95mV  
VFB = 5mV  
VNTC falling edge  
1.16  
0.76  
0.34  
55  
1.25  
0.82  
0.41  
110  
58  
1.34  
0.88  
0.47  
185  
72  
V
V
V
mV  
μA  
μA  
41  
1
Thermal Shutdown  
Thermal shutdown threshold (5)  
Thermal shutdown hysteresis(5)  
TSD  
THYS  
150  
60  
°C  
°C  
NOTE:  
5) Guaranteed by characterization.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
4
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
TYPICAL PERFORMANCE CHARACTERISTICS  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
5
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
TYPICAL PERFORMACE CHARACTERISTICS (continued)  
Performance waveforms are tested on the evaluation board.  
VIN = 12V, 2 WLEDs in series, VOUT = 5.9V, ILED = 1.5A, L = 4.7μH, TA = 25°C, unless otherwise  
noted.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
6
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
TYPICAL PERFORMACE CHARACTERISTICS (continued)  
Performance waveforms are tested on the evaluation board.  
VIN = 12V, 2 WLEDs in series, VOUT = 5.9V, ILED = 1.5A, L = 4.7μH, TA = 25°C, unless otherwise  
noted.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
7
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
TYPICAL PERFORMACE CHARACTERISTICS (continued)  
Performance waveforms are tested on the evaluation board.  
VIN = 12V, 2 WLEDs in series, VOUT = 5.9V, ILED = 1.5A, L = 4.7μH, TA = 25°C, unless otherwise  
noted.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
8
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
PIN FUNCTIONS  
Pin #  
Name  
Description  
TSOT23-6 TSOT23-8  
Ground. GND is the voltage reference for the regulated output voltage.  
Give careful consideration to GND during layout.  
1
2
5
6
GND  
SW  
Switch output.  
Supply voltage. The MP2410A operates on a 4.2V to 24V, unregulated  
input. An input capacitor is needed to prevent large voltage spikes from  
appearing at the input.  
3
4
7
2
VIN  
FB  
Current sense feedback voltage. FB’s internal reference voltage is 0.1V.  
On/off control input and dimming command input. Leaving EN/DIM  
floating or applying a voltage higher than 0.59V on EN/DIM turns on the  
MP2410A. For analog dimming, when the EN/DIM voltage rises up from  
0.7V to 1.44V, the output current changes from its min value to the full-  
scale LED current. For PWM dimming, apply a 100Hz to 2kHz PWM  
signal with an amplitude higher than 1.5V to EN/DIM.  
5
6
3
4
EN/DIM  
BST  
Bootstrap. Connect a capacitor between SW and BST to form a floating  
supply across the power switch driver. This capacitor is needed to drive  
the power switch’s gate above the supply voltage.  
LED temperature protection. Connect an NTC resistor from NTC to  
GND to reduce the output current to protect the LED when the ambient  
temperature rises up at high levels.  
-
-
1
8
NTC  
NC  
No connection.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
9
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
BLOCK DIAGRAM  
VIN  
Input Power  
Supply  
BST  
SW  
EN/DIM  
GND  
50kΩ  
2pF  
NTC  
40pF  
FAULT  
DETECTION  
FB  
Figure 1: Functional Block Diagram  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
10  
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
If both VIN and EN/DIM are higher than their  
appropriate thresholds, the chip starts up. The  
reference block starts first to generate stable  
reference voltages and currents. The internal  
regulator is then enabled. The regulator provides  
a stable supply for the remaining circuitries.  
OPERATION  
The MP2410A is a high-frequency, synchronous,  
rectified, step-down, switching mode LED driver  
with a built-in, internal power MOSFET and  
synchronous rectifier switch. The MP2410A  
offers a very high-performance solution that  
achieves up to 2A of continuous output LED  
current with excellent load and line regulation  
over a wide input supply range.  
Three events can shut down the chip: EN/DIM  
low for longer than tOFF_DELAY, VIN drops below  
UVLO, and thermal shutdown. In the shutdown  
procedure, the signaling path is blocked first to  
prevent any fault triggering. The COMP voltage  
(VCOMP) and the internal supply rail are then  
pulled down.  
The MP2410A operates in a fixed 1MHz  
frequency, and uses peak current control mode  
to regulate the output current. A new switching  
cycle is initiated by the internal clock at the  
beginning of every switching cycle.  
Error Amplifier (EA)  
The internal, low, offset error amplifier compares  
the FB voltage with the internal 100mV reference  
and outputs a COMP voltage, which is inside of  
the chip and is used to control the high-side  
MOSFET peak current and regulate the output  
current.  
The integrated high-side power MOSFET is  
turned on, and the inductor current rises linearly  
to provide energy to the load. The high-side  
power MOSFET remains on until its current  
reaches the value of the COMP level, which is  
the output of the internal error amplifier. The  
output voltage of the error amplifier depends on  
the difference of the output feedback and the  
internal, high-precision reference.  
Internal Soft Start (SS)  
A soft start (SS) is implemented to prevent the  
converter output current from overshooting  
during start-up. When the chip starts, the internal  
circuitry generates a soft-start voltage that ramps  
up from 0V. The soft-start period lasts until the  
voltage on the soft-start capacitor exceeds the  
0.1V reference voltage. At this point, the  
reference voltage takes over.  
The high-side power switch remains off until the  
next clock cycle begins. After the high-side  
switch turns off, the low-side sync switch turns on,  
and the inductor current flows through the low-  
side switch. To prevent a shoot-through, a dead  
time is implemented to prevent the high-side and  
low-side FETs from turning on at the same time.  
Floating Driver and Bootstrap Charging  
When the duty cycle of one switching period  
reaches 94%, the current in the high-side power  
MOSFET cannot reach the COMP-set current  
value, and the high-side power MOSFET is  
forced to turn off.  
The high-side, floating, power MOSFET driver is  
powered by an external bootstrap capacitor. The  
bootstrap capacitor voltage is regulated  
internally. During normal operation, a 5.1V  
bootstrap voltage is maintained between BST  
and SW.  
Under-Voltage Lockout (UVLO) and IC Start-  
Up/Shutdown Procedure  
Under-voltage lockout (UVLO) is implemented to  
prevent the chip from operating at an insufficient  
supply voltage. The MP2410A UVLO comparator  
monitors the output voltage of the internal  
regulator, which is supplied from VIN.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
11  
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
Enable and Dimming Control (EN/DIM)  
PWM Dimming  
EN/DIM is a control pin that turns the regulator  
on and off and dims the output LED current.  
Leave EN/DIM floating or drive it high to turn on  
the MP2410A. After EN/DIM is pulled low for  
tOFF_DELAY (22ms, typically), the MP2410A is  
turned off. Figure 2 shows the control logic of  
EN/DIM.  
Apply a PWM signal on EN/DIM to implement  
PWM dimming mode. The dimming frequency is  
recommended to be in the range of 100Hz to  
2kHz to achieve good dimming linearity. The  
digital signal’s amplitude must be higher than  
1.5V.  
Open LED  
tOFF_DELAY  
If the LED is open without a feedback signal, the  
MP2410A works at the maximum duty cycle, and  
the output voltage rises up close to the input  
voltage. Every power component operates at a  
safe state.  
EN/DIM  
Internal  
Enable  
LED Short-Circuit Protection (SCP)  
Figure 2: EN/DIM Time Sequence  
Analog Dimming  
The MP2410A integrates LED short-circuit  
protection (SCP) circuitry. There are several  
features protecting the MP2410A from damage  
when an LED short circuit occurs.  
Apply a DC signal on EN/DIM to dim the  
MP2410A in analog dimming mode. When the  
voltage on EN/DIM is lower than VADIM_MIN, the  
LED current is regulated to the minimal scale.  
When the voltage on EN/DIM is between  
VADIM_MIN and VADIM_MAX, the LED current changes  
from the minimal scale to the full scale of the  
LED current. If the voltage on EN/DIM is higher  
than VADIM_MAX, the maximum LED current is  
regulated.  
The MP2410A features a cycle-by-cycle current  
limit to restrict the maximum current of the  
inductor. A protection mechanism monitors the  
FB level though an internal R-C filter. Once the  
FB level rises up to reach VFB_BURST_AL, the chip  
stops switching until the FB level drops to a lower  
value, and the system works in burst mode.  
In the worst-case scenario, the LED is shorted to  
GND. If the cycle-by-cycle current-limit function  
cannot clamp the current overshoot sufficiently,  
then the current through both the high-side and  
low-side FETs is also monitored by the over-  
current detector inside the chip. If this current is  
higher than the short-circuit threshold (IOCP), the  
MP2410A treats this as a short-circuit condition.  
Figure 3 shows the analog dimming curve. Due  
to the hysteretic of the EN/DIM on/off threshold,  
the chip remains at the minimal LED current  
longer at the VEN/DIM falling edge until VEN/DIM is  
lower than VEN_OFF. The dimming curve is the  
same in the linear dimming range.  
ILED  
When an over-current condition or short-circuit  
condition is detected, the MP2410A turns off both  
the high-side and low-side MOSFETs for 2.4ms  
and restarts. During this period, VCOMP is pulled  
down to ground, so the restart from the fault  
condition is also done with a soft start.  
Full Scale  
VEN_ON  
Min Scale  
0
VADIM_MIN  
VADIM_MAX  
ADIM  
VEN_OFF  
Figure 3: Analog Dimming Curve  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
12  
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
Thermal Protection  
Thermal Shutdown  
NTC provides LED thermal protection. An NTC  
resistor used to monitor the ambient temperature  
can be connected to NTC directly. There is an  
internal current source flowing out of NTC. The  
corresponding voltage is generated on the  
external NTC resistor and the LED current  
changes (see Figure 4).  
Thermal shutdown is implemented to prevent the  
chip from operating at exceedingly high  
temperatures. When the silicon die temperature  
is higher than 150°C, OTP shuts down the entire  
chip. When the temperature is below its lower  
threshold (typically 90°C), the chip restarts.  
ILED  
Full Scale  
Min Scale  
0
VSD_NTC VL_NTC  
VH_NTC  
VNTC  
Figure 4: NTC Curve  
The NTC resistance value drops when the  
ambient temperature rises up. If the NTC voltage  
drops below VSD_NTC  
,
the switching stops  
completely, and the LED current drops to 0A, so  
the LED lamp can be shut down by pulling NTC  
down.  
Additionally, to protect against any lethal thermal  
damage, when the inner temperature exceeds  
the OTP threshold, the MP2410A shuts down the  
switching cycle with thermal shutdown until the  
temperature drops to its lower threshold.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
13  
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
APPLICATION INFORMATION  
Setting the LED Current  
Selecting the Input Capacitor  
A current sense resistor is inserted between the  
anode of LED and GND. The current sense  
resistor value can be calculated with Equation  
(1):  
The input capacitor reduces the surge current  
drawn from the input supply and the switching  
noise from the device. The input capacitor  
impedance at the switching frequency should be  
less than the source impedance to prevent the  
high-frequency switching current from passing  
through the input. Ceramic capacitors with X5R  
or X7R dielectrics are highly recommended  
because of their low ESR and small temperature  
coefficients. For most applications, a 10µF  
capacitor is sufficient.  
0.1V  
RS   
ILED  
(1)  
For a 2A LED current output, choose RS = 50mΩ.  
Selecting the Inductor  
An inductor less than 100µH with a nominal DC  
current rating at least 25% higher than the  
maximum load current is recommended for most  
applications. For the highest efficiency, the  
inductor’s DC resistance should be less than  
100mΩ. For most designs, the required  
inductance value can be derived from Equation  
(2):  
Selecting the Output Capacitor  
The output capacitor keeps the output current  
ripple small and ensures feedback loop stability.  
The output capacitor impedance should be low at  
the switching frequency. Ceramic capacitors with  
X5R or X7R dielectrics are recommended for  
their low ESR characteristics. For most  
applications, a 10µF ceramic capacitor is  
sufficient.  
VOUT (V VOUT  
)
IN  
L   
V  IL fSW  
IN  
(2)  
PCB Layout Guidelines  
Where IL is the inductor ripple current.  
Efficient PCB layout is critical for stable  
operation. For best results, refer to the guidelines  
below.  
Choose the inductor ripple current to be 30% of  
the maximum load current. The maximum  
inductor peak current can be calculated with  
Equation (3):  
1. Place the high current paths (GND, VIN, and  
SW) very close to the device with short,  
direct, and wide traces.  
IL  
2
IL(MAX) ILED  
(3)  
2. Place the input capacitor as close to IN and  
GND as possible.  
3. Place the external feedback resistors next to  
FB.  
4. Keep the switch node traces short and away  
from the feedback network.  
For more information, please refer to the related  
evaluation board datasheet.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
14  
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
TYPICAL APPLICATION CIRCUIT  
R3  
0
C3  
10nF/50V  
L1  
4.7µH  
DS84LCB-B1134AS-4R7N  
U1  
TP4  
4
6
1
1
BST  
SW  
LED+  
TP1  
C2  
R4  
1k  
10µF/35V  
1
7
3
2
VIN  
FB  
VIN  
1210  
TP5  
C1  
MP2410A  
LED-  
4.7µF/35V  
1206  
8
5
EN/DIM  
NTC  
N/C  
R5  
R1  
0.1/1%  
1206  
R2  
0.2/1%  
1206  
NC  
TP2  
TP3  
1
GND  
1
EN/DIM  
GND  
C4  
2.2nF/50V  
R6  
20k  
NTC1  
1
Figure 5: Typical Buck Converter Application, VIN = 8V to 24V, VO = 5.9V, ILED = 1.5A  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
15  
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
PACKAGE INFORMATION  
TSOT23-6  
See note 7  
EXAMPLE  
TOP MARK  
IAAAA  
PIN 1 ID  
RECOMMENDED LAND PATTERN  
TOP VIEW  
SEATING PLANE  
SEE DETAIL ''A''  
FRONT VIEW  
SIDE VIEW  
NOTE:  
1) ALL DIMENSIONS ARE IN MILLIMETERS.  
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,  
PROTRUSION OR GATE BURR.  
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH  
OR PROTRUSION.  
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)  
SHALL BE 0.10 MILLIMETERS MAX.  
5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AB.  
6) DRAWING IS NOT TO SCALE.  
7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK  
FROM LEFT TO RIGHT (SEE EXAMPLE TOP MARK).  
DETAIL "A"  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
16  
MP2410A 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER  
PACKAGE INFORMATION (continued)  
TSOT23-8  
See note 7  
EXAMPLE  
TOP MARK  
IAAAA  
PIN 1 ID  
RECOMMENDED LAND PATTERN  
TOP VIEW  
SEATING PLANE  
SEE DETAIL''A''  
FRONT VIEW  
SIDE VIEW  
NOTE:  
1) ALL DIMENSIONS ARE IN MILLIMETERS.  
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,  
PROTRUSION OR GATE BURR.  
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD  
FLASH OR PROTRUSION.  
4) LEAD COPLANARITY(BOTTOM OF LEADS AFTER  
FORMING) SHALL BE0.10 MILLIMETERS MAX.  
5) JEDEC REFERENCE IS MO-193, VARIATION BA.  
6) DRAWING IS NOT TO SCALE.  
DETAIL ''A''  
7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK  
FROM LEFT TO RIGHT, (SEE EXAMPLE TOP MARK)  
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.  
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS  
products into any application. MPS will not assume any legal responsibility for any said applications.  
MP2410A Rev. 1.0  
4/25/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
17  

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