|
Details, datasheet, quote on part number:LM3595LD
| |
| Part: | LM3595LD |
| Category: | Optoelectronics => Drivers/Controllers => LEDs => White-LED Drivers |
| Description: | LM3595 - Parallel White-led Driver, Package: Llp, Pin Nb=10 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM3595LD datasheet File size : 240 kB |
| Request For quote: | Find where to buy LM3595LD
|
| |
Datasheet text preview:
LM3595 Parallel White-LED Driver
August 2003
LM3595 Parallel White-LED Driver
General Description
The LM3595 is a parallel white-LED driver that is capable of driving four white LEDs. It can supply a total output current of 100mA over an input voltage range of 3.0V to 5.5V. The amount of constant current sourced to the outputs is user selectable using one external sense resistor. LM3595 typically draws 0.03µA when placed in shutdown, and 200µA when operating in the no-load condition. If any of the outputs are not used, leave the pin(s) unconnected. Brightness can be controlled by both analog and PWM techniques. A voltage between 0V and 3V may be applied to the BRGT pin to vary the current. Output current will linearly track the voltage applied to the BRGT pin. An active-low level must be present on the BR-ON pin for analog brightness control to be disabled. Alternatively, a PWM signal can be applied to the EN pin to vary the perceived brightness of the LED. The LM3595 uses an active-high enable level. The LM3595 is available in National's LLP-10 package.
Features
n Regulated IOUT with ± 0.5% matching between constant current outputs n Drives one, two, three or four white LED's with no bias resistors n 3.0V to 5.5V Input voltage n Up to 100mA output current n Active-High Enable Pin n Analog Brightness Control n Very small solution size n LLP-10 package: 3.0mm x 3.0mm x 0.8mm n Very Low Shutdown current (0.03µA typ.)
Applications
n Portable devices using white or blue LEDs with display and backlight or frontlight n Keypad LEDs n Strobe LEDs
Typical Application Circuit
20072201
© 2003 National Semiconductor Corporation
DS200722
www.national.com
LM3595
Connection Diagram
LM3595 10-Pin Leadless Leadframe Package (LLP) - 3mm X 3mm NS Package Number LDA10A
20072202
Pin Description
Pin 9 1,2,3,4 5 6 EN 10 7 BRGT Name VIN OUT1-4 ISET Input Voltage Current Source Outputs 1- 4 - Connect directly to LED's Current Set Input- The resistor value tied between this pin and ground sets the output current. Active-High Enable Input - A 1M resistor is connected internally between this pin and GND to pull the voltage on this pin to 0V, and shut down the part, when the pin is left floating. Active-High Analog Brightness Control Enable - A voltage of .65 x VIN must be applied to this pin to enable analog brightness control. Analog-voltage-controlled Brightness Input - When the BR-ON pin is set high, the voltage on this pin allows analog control of the LED's brightness. The recommended voltage range on this pin is 0 - 3 V where 3V is VBR(MAX). The input impedance of this pin is 300k. Ground Description
BR-ON
8, DAP
GND
Ordering Information
Order Number LM3595LD LM3595LDX Package Number LDA10A LDA10A Package Marking L3595 L3595 Supplied as: 1000 units on Tape-and-Reel 3500 units on Tape-and-Reel
www.national.com
2
LM3595
Absolute Maximum Ratings
2)
(Notes 1,
Operating Ratings
Input Voltage Range (Note 5) Output Voltage Range (Note 5) Junction Temperature Range (Note 6) Ambient Temperature Range (Note 6)
(Notes 1, 2) 3.0V to 5.5V 2.0V to 5.5V -40°C to 105°C -40°C to 85°C
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN EN, BR-ON, BRGT -0.3V to 6.0V -0.3V to (VIN+ 0.3V) w/ 6.0V max 150°C Internally Limited -65°C to 150°C 260°C 2 kV 200V (Notes 2, 8)
Junction Temperature (TJ-MAX-ABS) Continuous Power Dissiation (Note 3) Storage Temperature Range Lead Temperature (Soldering, 5 Sec.) ESD Rating (Note 4) Human-body model Machine model
Thermal Information
Junction-to-Ambient Thermal Resistance, LLP-10 Package (JA) (Note 7) 55°C/W
Electrical Characteristics
Symbol Parameter
Limits in standard typeface and typical values apply for TJ = 25oC. Limits in boldface type apply over the operating junction temperature range. Unless otherwise specified: VIN = 5V, VOUTX = 3.6V, RSET = 8.25k, V(EN) = VIN, V(BR-ON) = 0V Conditions 3.0V VIN 5.5V 2.0V VOUTX (VIN - 0.7V) RSET = 4.99k IOUTX Output Current Regulation (Note 5) 3.0V VIN 5.5V 2.0V VOUTX (VIN - 0.42V) RSET = 8.25k 3.0V VIN 5.5V 2.0V VOUTX (VIN - 0.28V) RSET = 12.4k IOUTX-BRGT Analog Brightness Control Current Regulation Current Matching Between Any Two Outputs ISET Pin Voltage Output Current to Current Set Ratio Current Source Headroom Voltage (Note 5) IOUT = 95% x IOUT(nom) RSET = 4.99k (IOUT(nom) approx. 25mA) IOUT = 95% x IOUT(nom) RSET = 12.4k (IOUT(nom) approx. 10mA) IOUTX = 0mA, V(BR-ON) = VIN, RSET = Open IOUTX = 0mA, V(BR-ON) = VIN, RSET = 8.25k EN = 0, V(BR-ON) = VIN 3.0V VIN 5.5V 3.0V VIN 5.5V 3.0V VIN 5.5V 3.0V VIN 5.5V
3
Min 22.54 (-8%) 13.80 (-8%) 9.20 (-8%) 13.83 (-6.5%)
Typ 24.5
Max 26.46 (+8%) 16.20 (+8%) 10.80 (+8%) 15.77 (+6.5%) 250 4 1.293 (+6%) 105 (+5%) 690
Units
15.0
mA (%)
10.0
V(BRGT) = 3.0V, V(BR-ON) = VIN V(BRGT) = 0V, V(BR-ON) = VIN
14.8 100 0.5
mA (%) µA % V (%)
IOUT-MATCH VSET
1.147 (-6%) 95 (-5%)
1.22 100 500 200 200 350 0.03
IOUTX/ISET
VHR
mV 280 300 µA
IQ
Quiescent Supply Current
ISD VEN-IH VEN-IL VBRON-IH VBRON-IL
Shutdown Supply Current EN Input Logic High EN Input Logic Low BR-ON Input Logic High BR-ON Input Logic Low
1 VIN .5 VIN .35 x VIN
µA V V V V
1.2 0 .65 x VIN 0
www.national.com
|
|
