LM3500TL-21/NOPB National Semiconductor, LM3500TL-21/NOPB Datasheet - Page 10

• Manufacturer Part Number: LM3500TL-21/NOPB
• Description: IC LED DRVR WHT BCKLT 8-MICROSMD
• Manufacturer: National Semiconductor
• Type: Backlight, White LEDr

Specifications of LM3500TL-21/NOPB

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 850kHz ~ 1.15MHz
• Voltage - Supply: 2.7 V ~ 7 V
• Voltage - Output: 19.5 V ~ 20.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-MicroSMD
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 640mA
• Internal Switch(s): Yes
• Efficiency: 85%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM3500TL-21; LM3500TL-21TR

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LM3500-16, 3 LEDs, R
1) SW, 10V/div, DC
3) I
4) V
T = 250ns/div
3 LEDs, R
1) SHDN, 1V/div, DC
4) I
2) V
T = 200µs/div
V
CONT
L
L
, 100mA/div, DC
IN
, 100mA/div, DC
OUT
, 100mV/div, AC
= 2.7V
, 10/div, DC
LED
= 22Ω, V
LED
IN
= 3.0V
Start-Up: LM3500-21
NMOS R
= 22Ω, V
Typical V
(I
SW
IN
= 300mA)
DSON
= 3.0V
IN
Ripple
vs V
IN
20065768
20065796
20065774
10
3 LEDs, R
1) SHDN, 1V/div, DC
2) I
3) I
T = 100µs/div
LM3500-16, 3 LEDs, R
1) SHDN, 1V/div, DC
2) I
3) I
4) V
T = 1ms/div
L
LED
L
LED
OUT
, 100mA/div, DC
, 100mA/div, DC
, 20mA/div, DC
, 20mA/div, DC
, 10V/div, DC
LED
SHDN Pin Duty Cycle Control Waveforms
= 22Ω, V
PMOS R
IN
LED
= 3.0V
Start-Up: LM3500-16
= 22Ω, V
DSON
IN
vs Temperature
= 3.0V, SHDN frequency = 200Hz
20065771
20065772
20065775