LT3465ES6#TR Linear Technology, LT3465ES6#TR Datasheet

IC LED DRIVR WHITE BCKLGT TSOT-6

LT3465ES6#TR

Manufacturer Part Number
LT3465ES6#TR
Description
IC LED DRIVR WHITE BCKLGT TSOT-6
Manufacturer
Linear Technology
Type
Backlight, White LEDr
Datasheet

Specifications of LT3465ES6#TR

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
2.7 V ~ 16 V
Voltage - Output
30V
Mounting Type
Surface Mount
Package / Case
TSOT-23-6, TSOT-6
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
20mA
Internal Switch(s)
Yes
Efficiency
81%
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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APPLICATIO S
FEATURES
TYPICAL APPLICATIO
AND DIMMING
Inherently Matched LED Current
Drives Up to Six LEDs from a 3.6V Supply
No External Schottky Diode Required
1.2MHz Switching Frequency (LT3465)
2.4MHz Switching Frequency Above AM Broadcast
Band (LT3465A)
V
V
Automatic Soft-Start (LT3465)
Open LED Protection
High Efficiency: 81% (LT3465) 79% (LT3465A)
Typical
Requires Only 0.22µF Output Capacitor
Low Profile (1mm) SOT-23
Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers
SHUTDOWN
IN
OUT(MAX)
CONTROL
3V TO 5V
Figure 1. Li-Ion Powered Driver for Four White LEDs
Range: 2.7V to 16V
= 30V
C1, C2: X5R OR X7R DIELECTRIC
L1: MURATA LQH32CN220
C1
1µF
U
22µH
L1
V
CTRL
SW
IN
LT3465A
LT3465/
GND
V
OUT
FB
U
10Ω
3465A F01a
C2
0.22µF
DESCRIPTIO
The LT
designed to drive up to six LEDs in series from a Li-Ion cell.
Series connection of the LEDs provides identical LED
currents and eliminates the need for ballast resistors.
These devices integrate the Schottky diode required exter-
nally on competing devices. Additional features include
output voltage limiting when LEDs are disconnected, one-
pin shutdown and dimming control. The LT3465 has
internal soft-start.
The LT3465 switches at 1.2MHz, allowing the use of tiny
external components. The faster LT3465A switches at
2.4MHz. Constant frequency switching results in low input
noise and a small output capacitor. Just 0.22µF is required
for 3-, 4- or 5-LED applications.
The LT3465 and LT3465A are available in the low profile
(1mm) 6-lead SOT-23 (ThinSOT
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a
®
3465/LT3465A are step-up DC/DC converters
LED Drivers with Built-in
1.2MHz/2.4MHz White
80
74
72
70
68
66
64
62
60
82
78
76
0
V
4 LEDs
IN
Schottky in ThinSOT
= 3.6V
Conversion Efficiency
U
5
LED CURRENT (mA)
LT3465/LT3465A
10
TM
) package.
15
LT3465
LT3465A
3465A F01b
20
3465afa
1

Related parts for LT3465ES6#TR

LT3465ES6#TR Summary of contents

Page 1

... Just 0.22µF is required for 3 5-LED applications. The LT3465 and LT3465A are available in the low profile (1mm) 6-lead SOT-23 (ThinSOT , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 82 ...

Page 2

LT3465/LT3465A ABSOLUTE AXI U RATI GS (Note 1) Input Voltage (V ) ................................................. 16V IN SW Voltage ............................................................. 36V FB Voltage ................................................................ 2V CTRL Voltage .......................................................... 10V Operating Temperature Range (Note 2) .. – 40°C to 85°C ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Switch Saturation Voltage (V CESAT 450 T = 25°C A 400 350 300 250 200 150 100 100 150 200 250 300 350 SWITCH CURRENT (mA) 3465A G01 V ...

Page 4

LT3465/LT3465A W U TYPICAL PERFOR A CE CHARACTERISTICS Feedback Voltage 210 208 206 204 202 200 198 196 194 192 190 –50 –30 – TEMPERATURE (°C) 3465A G09 V = 3.6V, 4 LEDs IN 85 ...

Page 5

CTIO S V (Pin 1): Output Pin. Connect to output capacitor and OUT LEDs. Minimize trace between this pin and output capaci- tor to reduce EMI. GND (Pin 2): Ground Pin. Connect directly to local ...

Page 6

LT3465/LT3465A W BLOCK DIAGRA – 200mV V + REF 1.25V + 10k CTRL 40k 4 6 COMPARATOR – Σ RAMP GENERATOR 1.2MHz* OSCILLATOR *2.4MHz FOR LT3465A Figure 2. ...

Page 7

U U APPLICATIO S I FOR ATIO Operation The LT3465 uses a constant frequency, current mode control scheme to provide excellent line and load regula- tion. Operation can be best understood by referring to the block diagram in Figure 2. ...

Page 8

LT3465/LT3465A U U APPLICATIO S I FOR ATIO skipping using a 1k resistor from FB to GND. The photo in Figure 3b details circuit operation driving three white LEDs at a 0.2mA load. Peak inductor current is less than 30mA. ...

Page 9

U U APPLICATIO S I FOR ATIO Soft-Start (LT3465) The LT3465 has an internal soft-start circuit to limit the input current during circuit start-up. The circuit start-up waveforms are shown in Figure 5. I 50mA/DIV IN V 5V/DIV OUT V ...

Page 10

LT3465/LT3465A U U APPLICATIO S I FOR ATIO lower than the frequency of the PWM signal. R1 needs to be much smaller than the internal impedance in the CTRL pin, which is 50kΩ resistor is suggested. LT3465/ R1 ...

Page 11

U U APPLICATIO S I FOR ATIO case. The Average FB Voltage vs PWM Duty Cycle curves of different PWM frequencies with different output ca- pacitors are shown in Figures 7c and 7d respectively. For PWM frequency lower than 1kHz, ...

Page 12

LT3465/LT3465A U U APPLICATIO S I FOR ATIO Open-Circuit Protection The LT3465 and LT3465A have an internal open-circuit protection circuit. In the cases of output open circuit, when the LEDs are disconnected from the circuit or the LEDs fail, the ...

Page 13

U TYPICAL APPLICATIO S L1 22µ OUT LT3465/ 1µF LT3465A CTRL FB GND C : TAIYO YUDEN JMK107BJ105 AVX 0603ZD105 OUT L1: MURATA LQH32CN220 L1 22µ ...

Page 14

LT3465/LT3465A U TYPICAL APPLICATIO L1 22µ OUT LT3465/ 1µF LT3465A CTRL GND C : TAIYO YUDEN JMK107BJ105 TAIYO YUDEN GMK212BJ224 OUT L1: MURATA LQH32CN220 14 Li-Ion to Five ...

Page 15

PACKAGE DESCRIPTIO 0.62 0.95 MAX REF 3.85 MAX 2.62 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.20 BSC DATUM ‘A’ 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE ...

Page 16

... OUT(MIN) Q SHDN : 2.5V to 5.5V 0.6V 20µA, IN OUT(MIN 2.5V to 5.5V 0.6V 40µA, IN OUT(MIN 2.5V to 5.5V 0.8V 60µA, IN OUT(MIN 2.5V to 5.5V 0.8V 60µA, IN OUT(MIN 2.5V to 5.5V 2.5V 25µA, IN OUT(MIN) Q LT/LT 0805 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2005 : <1µA, 3465afa ...

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