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NUD4301 Advance Information Dual Channel LED Driver/Current Source
This device is designed to replace switching regulators for driving LEDs in low voltage DC applications (up to 6 V). Its unique integrated circuit design provides the ability to drive external FETs to achieve higher voltage and current capabilities for different application needs (see Figure 8). An external resistor allows the circuit designer to set the LED current for different applications needs. The device is packaged in a small surface mount leadless package (DFN8), which results in a significant reduction of both system cost and board space.
Features http://onsemi.com MARKING DIAGRAM
43 M G G
* * * * * *
Low Dropout Voltage < 300 mV Programmable Output Current from 1 mA to 30 mA Dual Output with Independent Current Limit Set DC Current in LED Analog/Digital PWM Capability This is a Pb-Free Device
DFN8 CASE 506AQ 43 M G
1
= Specific Device Code = Date Code = Pb-Free Package
(Note: Microdot may be in either location)
PIN CONFIGURATION
1 2 3 4
Typical Applications
* Portables: PDAs, Cell phones * LCD Backlighting Applications
9 VCC 9
6 Drain1 7 Drain2 1 Enable
8
7 6 5 (Bottom View)
ORDERING INFORMATION
Device NUD4301MNT1G Package DFN8 (Pb-Free) Shipping 3000/Tape & Reel
Current Limit FET1
3 NC
4 GND
Figure 1. Block Diagram
This document contains information on a new product. Specifications and information herein are subject to change without notice.
(c) Semiconductor Components Industries, LLC, 2007
February, 2007 - Rev. P4
III III
Current Limit FET2
2 Dim
III IIII III IIII IIII IIII
Enable
PWM Analog/ Digital Control
For information on tape and reel specifications, including part orientation and tape sizes, please 8 refer to our Tape and Reel Packaging Specification Source2 Brochure, BRD8011/D. 5 Source1
1
Publication Order Number: NUD4301/D
NUD4301
FUNCTIONAL PIN DESCRIPTIONS
Pin 1 2 3 4 5 6 7 8 9 Function Enable Dim NC GND Source1 Drain1 Drain2 Source2 VCC Description The device is enabled with a positive voltage signal at this pin. The enable controls both channels. This pin is used for analog or PWM dimming control. An analog signal of 0 - 3.3 volts is required, or a PWM signal with an amplitude greater than 3.3 volts. The dim controls both channels. No connection. Ground Reference to the device. Source terminal of the FET 1 Drain terminal of the FET 1, which is also the switching node of the load 1. Drain terminal of the FET 2, which is also the switching node of the load 2. Source terminal of the FET 2 Input voltage to the LED driver. This voltage is compatible with any battery based systems of up to 6 V.
MAXIMUM RATINGS
Rating Input Voltage, Operating Drain Voltage, Operating Enable Voltage, Operating Dim Voltage, Operating Drain Current, Peak Drain Current, Continuous Thermal Resistance, Junction-to-Air (Note 1) Power Dissipation @ TA = 25C (Note 1) Derating above 25C Operating Temperature Range Non-Operating Temperature Range Maximum Lead Temperature for Soldering Purposes (1.8" from case for 10 s) Steady State (VCC to GND) Transient (1 ms) Steady State (Drain-to-Source) Transient (1 ms) Steady State Steady State Symbol VCC VDS VEN Vdim IDpk ID(avg) QJA Pmax TJ TJ TL Value -0.3 to 6 -0.3 to 7 -0.3 to 6 -0.3 to 7 -0.3 to 6 -0.3 to 3.6 100 30 365 340 2.7 -40 to 150 -55 to 175 260 Unit V V V V mA mA C/W mW mW/C C C C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. Mounted onto minimum pad board.
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NUD4301
ELECTRICAL CHARACTERISTICS (Unless otherwise noted: VCC = 3.6 V, Rsense = 4.7 W, 1%, TA = 25C for typical values, For min/max values TJ is the applicable junction temperature)
Characteristics Power FET (Each Channel) ON Resistance (VCC = 3.6 V, ID = 10 mA, Rsense = 4.7 W, Vdim = 3.3 V) Zero Enable Voltage Drain Current (VDS = 6 V, VEnable = 0 V) Drain-to-Source Sustaining Voltage (ID = 100 mA) Output Capacitance (VDS = 6 V, VEnable = 0 V, f = 1 kHz) Voltage Drop (Note 2) (VCC = 3.6 V, VLED = 3.3 V, ID = 20 mA, Rsense = 4.7 W, Vdim = 3.3 V) Current Regulation Circuit (Each Channel) Output Current Regulation (VCC = 3.6 V, VLED = 3.3 V, Rsense = 4.7 W, Vdim = 3.3 V) Enable Logic Level High (Unit Operational) Logic Level Low (Unit Shutdown) Dim Off Voltage (Zero Output Current), ID = 20 mA, Rsense = 4.7 W On Voltage (Max Output Current), ID = Iout, Rsense = 4.7 W Max PWM Frequency Bias Supply (Complete Device) Bias Current (VCC = 3.6 V, Device Non-Operational, VEnable = 0 V) Bias Current (VCC = 3.6 V, Device Operational, VEnable = VCC) 2. Vdrop = VDS + VRsense IBIAS1 IBIAS2 - - 10 100 100 200 nA mA Vzero Vmax fmax - 3.1 - - 3.3 10 50 3.6 - mV V kHz VENhigh VENlow 1.7 - - - - 0.7 V V Iout 19 20 21 mA Vdrop RDSon IDSS VBRDSS - - 7.0 - - 5.0 10 - 100 - 5.5 100 - - 300 W nA V pF mV Symbol Min Typ Max Unit
LED2 Enable Dim + - PWM 3.3 V 1 kHz NC GND Vcc 1 2 3 4 NUD4301 8 7 6 5 Source2 Drain2 Drain1 Source1
LED1
3.6 V
Rsense2
Rsense1
Figure 2. Typical Low Voltage Application Circuit
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NUD4301 TYPICAL PERFORMANCE CURVES
(TA = 255C, unless otherwise noted)
100 25 20 ILED (mA) ILED (mA) 15 10 5.0 1 0 ILED2 ILED1 10
1
10 Rsense (W)
100
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
VCC (V)
Figure 3. Current Limit Adjustment
Figure 4. Typical Line Regulation Performance (VLED = 3.4 V, Rsense = 4.7 W)
20000
20
ILED2
ILED1 15000 ILED (mA)
ILED2
ILED1
15 ILED (mA)
10
10000
5.0
5000
0
0
0.05
0.10
0.15 Vdrop (V)
0.20
0.25
0.30
0
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 Vdim (V)
Figure 5. Typical Current Regulation vs. Vdrop (Vdrop = VDS + VRsense)
Figure 6. Typical Current Regulation vs. Vdim (VLED = 3.4 V, Rsense = 4.7 W)
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NUD4301
Analog Operation Digital Operation
3.3 V
VDIM time
ILimit ILED
Iavg time
Figure 7. Dimming Operation Curves (Graph obtained from SPICE simulations) Theory of Operation (Vdim 35) Rsense
This device contains two LED current sources. Each channel is comprised of a lateral N-channel FET controlled by a current limit circuit that senses the voltage drop across the Rsense resistor and compares it with an internal voltage reference to provide the current regulation. For dimming applications, the current limit circuit operates in combination with the PWM signal applied to the dim pin of the device for control purposes.
Current Limit and PWM Circuits
ILED +
With a DC voltage of 3.3 V applied to the Dim pin of the device, the internal reference voltage of the current limit circuit is set to 94 mV. The Rsense resistor is then selected through a very simple formula: Rsense = 94 mV / ILED. This allows the user to set different LED currents (between 1 mA and 30 mA). For dimming control, a PWM signal may be applied to the dim pin of the device. This PWM signal can be used to perform digital dimming. For digital dimming, the amplitude of the PWM signal must be 3.3 V or higher. The LED current will be proportional to the duty cycle of the PWM signal. For analog dimming, the input signal to the Dim pin must be between 0 V and 3.3 V. The resulting output current will be given by the following formula:
If a PWM signal is beyond the input frequency range for the Dim pin, a RC filter may be used to convert it to an analog signal. The RC filter generates an analog voltage signal, which is proportional to the duty cycle of the PWM signal applied. This analog signal is then used as the new reference voltage for the current limit circuit, which compares it with the voltage signal generated across Rsense to provide the current regulation.
Enable
The enable circuit turns the device on when a positive signal is applied to the enable pin. The circuit is designed to allow low current consumption (0.1 mA typical) when the device is disabled.
LCD Backlighting Applications
The voltage and current capability of the NUD4301 device can be increased by using external FETs so that the circuit can be used in high voltage backlighting applications such as TV. Figure 8 shows the schematic diagram of this concept.
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NUD4301
LED 1
LED 16
R1
R2 LED 15 LED 30
Current Sense1 Jumper 50-60 V + - 5.1 V Dim Jumper Enable Jumper ENABLE DIM_TP Z1 C1 EN_TP DIM NC GND NUD4301 R5 VCC SOURCE2 DRAIN2 DRAIN1 SOURCE1 R6 Q1 Q2
Current Sense2 Jumper
S2_TP D2_TP D1_TP S1_TP
C2
R3
C3
R4
Figure 8. Typical LCD Backlighting Application Circuit
Table 1. PROPOSED BOM FOR THE CIRCUIT OF FIGURE 8
Designator R1, R2 C1 Z1 R3, R4 R5, R6 C2, C3 Q1, Q2 NUD4301 Description Leaded Resistor Ceramic SMT 1206 Capacitor Zener Diode SOT-23 SMT 0805 Resistor SMT 0805 Resistor Tantalum Leaded Capacitor N-Channel FET SOT-23 Dual LED Driver, DFN 2x2 Characteristics 10 K, 1/2 W, 5% 10 mF, 10 V 5.1 V, 300 mW 4.7 W, 1% 560 K, 5% 1 mF, 10 V 60 V, 115 mA 5 V, 30 mA Part Number User Selectable User Selectable BZX84C5V1LT1, G User Selectable User Selectable User Selectable 2N7002LT1G NUD4301 Manufacturer User Selectable User Selectable ON Semiconductor User Selectable User Selectable User Selectable ON Semiconductor ON Semiconductor
For more details about this application circuit concept, please refer to the application notes posted at the ON Semiconductor Web site in the NUD4301 page.
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NUD4301
PACKAGE DIMENSIONS
DFN8 CASE 506AQ-01 ISSUE A
D A B
PIN ONE REFERENCE NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994 . 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0.25 AND 0.30 MM FROM TERMINAL. 4. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 5. INTERNAL PAD SIZE: 1.5 X 0.9 MM. MILLIMETERS MIN MAX 0.80 1.00 0.00 0.05 0.20 REF 0.20 0.30 2.00 BSC 1.10 1.30 2.00 BSC 0.50 0.70 0.50 BSC 0.20 --- 0.25 0.45
E
2X
0.10 C
2X
0.10 C
TOP VIEW
DIM A A1 A3 b D D2 E E2 e K L
0.10 C
8X
0.08 C
SEATING PLANE
A1
8X
K
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without 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 sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, 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 negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
CCCC CCCC CCCC CCCC
e/2
1
A (A3) C e
4 NOTE 5
SOLDERING FOOTPRINT*
0.575 0.0226 0.250 0.0098 1.350 0.0531 1.150 0.0453
SIDE VIEW D2
L
0.300 0.0118 0.500 0.0197 PITCH
E2
0.700 0.0276
SCALE 15:1
mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
8 5 8X
b
0.10 C A B 0.05 C
NOTE 3
BOTTOM VIEW
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NUD4301/D

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