LTC3454EDD#TRPBF Linear Technology, LTC3454EDD#TRPBF Datasheet - Page 11

• Manufacturer Part Number: LTC3454EDD#TRPBF
• Description: IC LED DRIVER PHOTO FLASH 10-DFN
• Manufacturer: Linear Technology
• Type: Photo Flash LEDr

Specifications of LTC3454EDD#TRPBF

• Topology: PWM, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight, Flash/Torch
• Type - Secondary: White LED
• Frequency: 900MHz ~ 1.15MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Voltage - Output: 5.15V
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Efficiency: 90%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
LED Failure Modes
If the LED fails as an open circuit, the safety amplifi er takes
control of the regulation loop to prevent V
The V
The safety amplifi er has no effect on loop regulation at
V
PACKAGE DESCRIPTION
OUT
Figure 3. Brightness Control Methods: (a) Using Voltage DAC, (b) Using Current DAC, (c) Using Potentiometer, (d) Using PWM Input
3.50 0.05
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
less than 5.15V.
OUT
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2.15 0.05
threshold at which this occurs is about 5.15V.
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
VOLTAGE
0.25 0.05
1.65 0.05
(2 SIDES)
DAC
V
V
IN
IN
V
R
R
R
DAC
SET
MIN
POT
2.38 0.05
(2 SIDES)
ENx
I
ENx
I
SETx
SETx
≥ R
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LTC3454
MIN
LTC3454
0.50
BSC
(3a)
(3c)
LED
LED
0.675 0.05
I
I
LED
LED
PACKAGE
OUTLINE
= 3850
= 3850
10-Lead Plastic DFN (3mm × 3mm)
OUT
(Reference LTC DWG # 05-08-1699)
0.8V – V
R
MIN
runaway.
R
0.8V
(SEE NOTE 6)
SET
+ R
V
V
TOP MARK
OUT
OUT
DAC
POT
PIN 1
DD Package
0.200 REF
If the LED fails as a short-circuit, the current limiting
circuitry detects this condition and limits the peak input
current to a safe level.
CURRENT
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
DAC
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
TOP AND BOTTOM OF PACKAGE
R
100
SET
V
V
IN
IN
R
V
PWM
SET
3.00 0.10
0.75 0.05
(4 SIDES)
IDAC ≤
ENx
I
ENx
I
SETx
SETx
≥ R
LTC3454
LTC3454
MIN
R
0.8V
0.00 – 0.05
MIN
f
PWM
1.65 0.10
(2 SIDES)
LED
LED
≥ 10kHz
(3b)
(3d)
I
LED
I
LED
DV
= 3850
= 3850
BOTTOM VIEW—EXPOSED PAD
= 3850 • IDAC
CC
0.8V – V
0.8V – (DC% • V
5
R = 0.115
6
2.38 0.10
R
(2 SIDES)
SET
V
V
TYP
OUT
OUT
PWM
3454 F03
R
SET
LTC3454
10
DVCC
1
0.50 BSC
0.25 0.05
0.38 0.10
)
(DD) DFN 1103
11
3454fa