OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC3210EUD-3#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3210-2/LTC3210-3
1
321023fb
Typical applicaTion
n
Multi-LED Light Supply for Cellphones/DSCs/PDAs
applicaTions
MAIN/CAM LED Controllers
with 32-Step Brightness Control
in 3mm × 3mm QFN
The LTC
®
3210-2/LTC3210-3 are low noise charge pump
DC/DC converters designed to drive three or four MAIN
LEDs and one high current CAM LED for camera lighting.
The LTC3210-2/LTC3210-3 require only four small ceramic
capacitors and two current 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 MAIN and CAM full-scale current settings
are programmed by two external resistors.
Shutdown mode and current output levels are selected
via two logic inputs. ENM and ENC are toggled to adjust
the LED currents via internal counters and DACs. A 5-bit
linear DAC (32 steps) provides high resolution brightness
control for the MAIN display.
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 LTC3210-2/LTC3210-3 are available
in a 3mm × 3mm 16-lead QFN package.
n
Low Noise Charge Pump Provides High Efficiency
with Automatic Mode Switching
n
Multimode Operation: 1x, 1.5x, 2x
n
Individual Full-Scale Current Set Resistors
n
Up to 500mA Total Output Current
n
Single Wire EN/Brightness Control for MAIN and
CAM LEDs
n
32:1 Linear Brightness Control Range for
MAIN Display
n
Three or Four 25mA Low Dropout MAIN LED Outputs
n
One 400mA Low Dropout CAM LED Output
n
Low Noise Constant Frequency Operation*
n
Low Shutdown Current: 3µA
n
Internal Soft-Start Limits Inrush Current During
Startup and Mode Switching
n
Open/Short LED Protection
n
No Inductors
n
3mm × 3mm 16-Lead Plastic QFN Package
4-LED MAIN Display
Efficiency vs V
BAT
Voltage
FeaTures DescripTion
C1P C1M C2P
RM RC GND
C2M
CPO
MLED1
MLED2
MLED3
MLED4
CLED
ENM
ENC
V
BAT
LTC3210-2
V
BAT
C1
2.2µF
C2
2.2µF
C3
2.2µF
30.1k
1%
24.3k
1%
ENM
ENC
C4
2.2µF
321023 TA01
MAIN CAM
V
BAT
(V)
3.0
EFFICIENCY (P
LED
/P
IN
) (%)
60
80
100
321023 TA01b
40
20
50
70
90
30
10
0
3.6 3.83.2 4.03.4
4.44.2
4 LEDs AT 9mA/LED
(TYP V
F
AT 9mA = 3V, NICHIA NSCW100)
T
A
= 25°C
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6411531.
LTC3210-2/LTC3210-3
2
321023fb
absoluTe MaxiMuM raTings
(Note 1)
The
l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
BAT
= 3.6V, C1 = C2 = C3 = C4 = 2.2µF, RM = 30.1k, RC = 24.3k,
ENM = high, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
BAT
Operating Voltage
l
2.9 4.5 V
I
VBAT
Operating Current I
CPO
= 0, 1x Mode, LSB Setting
I
CPO
= 0, 1.5x Mode
I
CPO
= 0, 2x Mode
0.4
2.5
4.5
mA
mA
mA
V
BAT
Shutdown Current ENM = ENC = Low
l
3 6 µA
MLED1, MLED2, MLED3 and MLED4 (LTC3210-2 Only) Current
LED
Current Ratio (I
MLED
/I
RM
) I
MLED
= Full Scale
l
481 525 589 A/A
LED Dropout Voltage Mode Switch Threshold, I
MLED
= Full Scale
75 mV
LED Current Matching Any Two Outputs 0.5 %
elecTrical characTerisTics
V
BAT
, CPO to GND ........................................ –0.3V to 6V
ENM, ENC ...................................–0.3V to (V
BAT
+ 0.3V)
I
CPO
(Note 2) ....................................................... 600mA
I
MLED1-4
.................................................................35mA
I
CLED
(Note 2)...................................................... 500mA
CPO Short-Circuit Duration .............................. Indefinite
Op
erating Temperature Range (Note 3) ...–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
16 15 14 13
5 6 7 8
TOP VIEW
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
9
10
17
11
12
4
3
2
1C1P
CPO
ENM
MLED1
GND
CLED
ENC
RC
C2P
V
BAT
C1M
C2M
MLED2
MLED3
MLED4
RM
T
JMAX
= 125°C, θ
JA
= 68°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
16 15 14 13
5 6 7 8
TOP VIEW
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
9
10
17
11
12
4
3
2
1C1P
CPO
ENM
MLED1
GND
CLED
ENC
RC
C2P
V
BAT
C1M
C2M
MLED2
MLED3
NC
RM
T
JMAX
= 125°C, θ
JA
= 68°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3210EUD-2#PBF LTC3210EUD-2#TRPBF LCHX
16-Lead
(3mm × 3mm)
Plastic QFN
–40°C to 85°C
LTC3210EUD-3#PBF LTC3210EUD-3#TRPBF LCHY
16-Lead
(3mm × 3mm)
Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For
more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC3210-2/LTC3210-3
3
321023fb
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.V
BAT
= 3.6V, C1 = C2 = C3 = C4 = 2.2µF, RM = 30.1k, RC = 24.3k,
ENM = high, unless otherwise noted.
Note 3: The LTC3210E-2/LTC3210E-3 are guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 4: 1.5x
mode output impedance is defined as (1.5V
BAT
– V
CPO
)/I
OUT
.
2x mode output impedance is defined as (2V
BAT
– V
CPO
)/I
OUT
.
Note 5: If
the part has been shut down then the initial enable time is about
100µs longer due to the bandgap enable time.
Note 1: Stresses
beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based
on long-term current density limitations. Assumes an
operating duty cycle of ≤10% under absolute maximum conditions
for durations less than 10 seconds. Maximum current for continuous
operation is 300mA.
PARAMETER CONDITIONS MIN TYP MAX UNITS
MLED Current, 5-Bit Linear DAC 1 ENM Strobe (FS)
31
ENM Strobes (FS/31)
20
0.640
mA
mA
CLED Current
LED
Current Ratio (I
CLED
/I
RC
) I
CLED
= Full Scale
l
6930 7700 8470 A/A
LED Dropout Voltage Mode Switch Threshold, I
CLED
= Full Scale 500 mV
CLED Current, 3-Bit Linear DAC 1 ENC Strobe (FS)
7
ENC Strobes (FS/7)
380
54
mA
mA
Charge Pump (CPO)
1x
Mode Output Voltage I
CPO
= 0mA V
BAT
V
1.5x Mode Output Voltage I
CPO
= 0mA 4.55 V
2x Mode Output Voltage I
CPO
= 0mA 5.05 V
1x Mode Output Impedance 0.55
Ω
1.5x
Mode Output Impedance V
BAT
= 3.4V, V
CPO
= 4.6V (Note 4) 3.15
Ω
2x
Mode Output Impedance V
BAT
= 3.2V, V
CPO
= 5.1V (Note 4) 3.95
Ω
CLOCK
Frequency
0.8 MHz
Mode Switching Delay 0.4 ms
CPO Short Circuit Detection
Threshold
Voltage
l
0.4 1.3 V
Test Current CPO = 0V, ENM = ENC = Low
l
10 30 mA
ENC, ENM
V
IL
l
0.4 V
V
IH
l
1.4 V
I
IH
ENM = ENC = 3.6V
l
10 15 20 µA
I
IL
ENM = ENC = 0V
l
–1 1 µA
ENC, ENM Timing
t
PW
Minimum Pulse Width
l
200 ns
t
SD
Low Time to Shutdown (ENC, ENM = Low)
l
50 150 250 µs
t
EN
Current Source Enable Time
(ENC, ENM = High) (Note 5)
l
50
150
250
µs
RM, RC
V
RM
, V
RC
l
1.16 1.20 1.24 V
I
RM
, I
RC
l
80 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3210EUD-3#PBF

Mfr. #:
Buy LTC3210EUD-3#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers MAIN/CAM LED Cntrs w/ 32-Step Brightness
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet