LT1937ESC6#TRM Linear Technology, LT1937ESC6#TRM Datasheet - Page 3

• Manufacturer Part Number: LT1937ESC6#TRM
• Description: IC LED DRVR WHITE BCKLGT SC-70-6
• Manufacturer: Linear Technology
• Type: Backlight, White LEDr

Specifications of LT1937ESC6#TRM

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 800kHz ~ 1.6MHz
• Voltage - Supply: 2.5 V ~ 10 V
• Voltage - Output: 36V
• Mounting Type: Surface Mount
• Package / Case: SC-70-6, SC-88, SOT-363
• Operating Temperature: -40°C ~ 85°C
• Internal Switch(s): Yes
• Efficiency: 84%
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output / Channel: -
• Other names: LT1937ESC6; LT1937ESC6

SW (Pin 1): Switch Pin. Connect inductor/diode here.
Minimize trace area at this pin to reduce EMI.
GND (Pin 2): Ground Pin. Connect directly to local ground
plane.
FB (Pin 3): Feedback Pin. Reference voltage is 95mV.
Connect cathode of lowest LED and resistor here. Calcu-
late resistor value according to the formula:
TYPICAL PERFOR A CE CHARACTERISTICS
PI FU CTIO S
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
R
60
50
30
20
10
40
U
0
0
–50
FB
0
Quiescent Current
Feedback Bias Current
= 95mV/I
–25
U
2
TEMPERATURE ( C)
0
LED
4
V
25 C
IN
25
U
(V)
–50 C
6
50
100 C
W
8
75
1937 G04
1937 G01
U
100
10
400
350
300
250
200
150
100
84
82
50
83
80
81
85
0
– 50
–50
SHDN Pin Bias Current
Efficiency vs Temperature
V
3 LEDs
IN
= 3.6V
– 25
TEMPERATURE ( C)
TEMPERATURE ( C)
SHDN = 3.6V
SHDN = 2.7V
0
0
I
I
I
LED
LED
LED
25
= 20mA
= 15mA
= 10mA
SHDN (Pin 4): Shutdown Pin. Connect to 1.5V or higher to
enable device; 0.4V or less to disable device.
GND (Pin 5, SC70 Package): Ground Pin. Connect to Pin
2 and to local ground plane
V
be locally bypassed.
IN
SHDN = 10V
(Pin 5/Pin 6 SC70 Package): Input Supply Pin. Must
50
50
SHDN = 3V
75
1937 G05
1937 G02
100
100
350
300
250
200
150
100
1.4
1.2
1.0
0.8
0.6
0.4
0.2
50
0
0
–50
0
Switching Frequency
Current Limit vs Duty Cycle
–25
20
TEMPERATURE ( C)
0
DUTY CYCLE (%)
40
25
60
LT1937
50
80
75
1937 G03
1937 G06
3
1937f
100
100