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LTC3217EUD#TRPBF

Description
LED Driver 4 Segment 6000uA Supply Current 16-Pin QFN EP T/R
File Size172KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3217EUD#TRPBF Overview

LED Driver 4 Segment 6000uA Supply Current 16-Pin QFN EP T/R

LTC3217EUD#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
Number of Segments4
Minimum Operating Supply Voltage (V)2.9
Maximum Operating Supply Voltage (V)4.5
Typical Operating Supply Voltage (V)3.3
Maximum Supply Current (uA)6000(Typ)
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
PackagingTape and Reel
Standard Package NameQFN
Pin Count16
Supplier PackageQFN EP
MountingSurface Mount
Package Height0.75(Max)
Package Length3
Package Width3
PCB changed16
Lead ShapeNo Lead
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
LTC3217
600mA Low Noise
Multi-LED Camera Light
Charge Pumps
DESCRIPTION
The LTC
®
3217 is a low noise charge pump DC/DC converter
designed to power four high current LEDs. The LTC3217
requires only four small ceramic capacitors and two cur-
rent set resistors to form a complete LED power supply
and current controller.
Built-in soft-start circuitry prevents excessive inrush cur-
rent during start-up and mode changes. High switching
frequency enables the use of small external capacitors.
Independent high and low current settings are programmed
by two external resistors. Shutdown mode and current
output levels are selected via two logic inputs.
The current through the LEDs is programmed via I
SET1
and I
SET2
. In addition, the brightness can be controlled
by pulse width modulation of the EN2 pin.
The charge pump optimizes efficiency based on the volt-
age across the LED current sources. The part powers up
in 1x mode and will automatically switch to boost mode
whenever any enabled LED current source begins to enter
dropout. The first dropout switches the part into 1.5x
mode and a subsequent dropout switches the part into
2x mode. The LTC3217 resets to 1x mode whenever the
part is shut down.
The LTC3217 is available in a low profile 16-lead
(3mm
×
3mm
×
0.75mm) QFN package.
Charge Pump Provides High Efficiency with
Automatic Mode Switching
Multimode Operation: 1x, 1.5x, 2x
Four Low Dropout LED Outputs
Up to 600mA Total Output Current
Independent Torch and Flash I
SET
and Enable Pins
Low Noise Constant Frequency Operation*
PWM Brightness Control via the EN2 Pin
Low Shutdown Current: 4μA
Internal Soft-Start Limits Inrush Current During
Start-Up and Mode Switching
Open/Short LED Protection
No Inductors
(3mm x 3mm) 16-Lead QFN Plastic Package
APPLICATIONS
n
Multi-LED Camera Light Supply for Cellphones/
DSCs/PDAs
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. *Protected by U.S. Patents including
6411531.
TYPICAL APPLICATION
C2
2.2μF
C3
2.2μF
100
C1P
V
BAT
C1
2.2μF
V
BAT
LTC3217
LED1
LED2
EN1 (TORCH)
EN2 (FLASH)
EN1
EN2
I
SET1
19.6k
1%
I
SET2
LED3
LED4
GND
EN1
0
1
0
1
EN2
0
0
1
1
I
LED
0 (SHUTDOWN)
25mA/LED
75mA/LED
100mA/LED
C1M C2P
C2M
C4
2.2μF
EFFICIENCY (P
LED
/PIN) (%)
CPO
AOT-2015HPW-1751B
90
80
70
60
50
40
30
20
10
0
3
3217 TA01
Efficiency vs V
BAT
100mA 200mA
400mA
6.49k
1%
TOTAL OUTPUT CURRENT
P
LED
/PIN
LED = 2015 HPW AOT
3.2
3.4
3.6 3.8
V
BAT
(V)
4
4.2
4.4
3217 TA01b
3217fa
1

LTC3217EUD#TRPBF Related Products

LTC3217EUD#TRPBF LTC3217EUD#PBF
Description LED Driver 4 Segment 6000uA Supply Current 16-Pin QFN EP T/R LED Driver 4 Segment 6000uA Supply Current 16-Pin QFN EP Tube
EU restricts the use of certain hazardous substances Compliant Compliant
ECCN (US) EAR99 EAR99
Part Status Active Active
HTS 8542.39.00.01 8542.39.00.01
Number of Segments 4 4
Minimum Operating Supply Voltage (V) 2.9 2.9
Maximum Operating Supply Voltage (V) 4.5 4.5
Typical Operating Supply Voltage (V) 3.3 3.3
Maximum Supply Current (uA) 6000(Typ) 6000(Typ)
Minimum Operating Temperature (°C) -40 -40
Maximum Operating Temperature (°C) 85 85
Supplier Temperature Grade Extended Extended
Packaging Tape and Reel Tube
Standard Package Name QFN QFN
Pin Count 16 16
Supplier Package QFN EP QFN EP
Mounting Surface Mount Surface Mount
Package Height 0.75(Max) 0.75(Max)
Package Length 3 3
Package Width 3 3
PCB changed 16 16
Lead Shape No Lead No Lead
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