LTC3454 Linear Technology, LTC3454 Datasheet - Page 2

• Manufacturer Part Number: LTC3454
• Description: 1A Synchronous Buck-Boost High Current LED Driver
• Manufacturer: Linear Technology

ABSOLUTE AXI U RATI GS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3454 is guaranteed to meet specifi cations from 0°C to
70°C. Specifi cations over the –40°C to 85°C operating temperature range
are assured by design, characterization and correlation with statistical
process controls.
LTC3454
(Note 1)
V
V
LED Peak Current ...................................................1.25A
Storage Temperature Range ...................–65°C to 125°C
Operating Temperature Range (Note 2) ...–40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
2
PARAMETER
Input Supply Voltage (V
Input DC Supply Current
Undervoltage Lockout Threshold
V
V
V
I
LED Output Current to Programming Current Ratio
LED Pin Voltage
Regulated Maximum V
PMOS Switch R
NMOS Switch R
Forward Current Limit
Reverse Current Limit
PMOS Switch Leakage
NMOS Switch Leakage
Oscillator Frequency
Soft-Start Time
SET1
EN1
EN1
EN1
IN
C
, EN1, EN2, I
Voltage .............................–0.3V to (V
Normal Operation
Shutdown
UVLO
, SW1, SW2, V
, V
, V
, V
and I
EN2
EN2
EN2
SET2
DC Threshold for Normal Operation (V
DC Threshold for Shutdown (V
Input Current
Servo Voltage
ON
ON
SET1
OUT
W
OUT
IN
, I
)
SET2
Voltage ...................... –0.3V to 6V
W W
IL
)
IH
)
IN
+ 0.3V) or 6V
U
CONDITIONS
(Typicals at V
2.7V ≤ V
2.7V ≤ V
V
V
V
3.08k ≤ R
I
I
LED Pin Open, Programmed I
Switches A and D (V
Switches B and C
Switch A
Switch D (V
Switches A, D
Switches B, C
LED
LED
IN
IN
IN
A
= 25°C, V
< UVLO Threshold; V
Rising
Falling
/(I
= 1A
ISET1
IN
IN
The
ISET1
≤ 5.5V (Note 4)
≤ 5.5V; V
+ I
OUT
IN
●
ISET2
IN
||R
= 3.6V, R
= 3.6V)
denotes the specifi cations which apply over the full operating
= 3.6V, R
ISET2
), I
EN1
OUT
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LED
Note 3: T
dissipation PD according to the following formula:
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: This parameter is tested using a feedback loop which servos V
to 1.8V.
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
≤ 20.5k
= V
ORDER PART NUMBER
= 3.6V)
ISET1
EN1
T
= 500mA (Note 5)
J
EN2
ISET
= T
= V
LED
= R
J
A
LTC3454EDD
= 0V
EN2
is calculated from the ambient temperature T
= 20.5k unless otherwise noted. (Note 2)
+ (PD • θ
= 1A
ISET2
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
= V
= 20.5k)
IN
JA
I
I
10-LEAD (3mm × 3mm) PLASTIC DFN
SET1
SET2
EN1
EN2
LED
°C/W).
http://www.linear.com/leadfree/
T
JMAX
1
2
3
4
5
●
●
●
●
●
●
●
●
= 125°C, θ
DD PACKAGE
TOP VIEW
11
3725
3775
MIN
1.75
4.95
780
788
2.7
0.2
2.5
0.9
–1
–1
–1
JA
= 40°C/W
U
DD PART MARKING
www.DataSheet4U.com
10
9
8
7
6
3850
3850
SW1
V
V
V
SW2
2.05
1.90
0.68
0.66
5.15
TYP
825
800
800
105
170
130
275
200
3.4
1.0
IN
C
OUT
0
5
LBQX
W
A
1200
3975
3925
MAX
and power
5.35
1.15
812
812
5.5
2.3
1.2
10
1
1
1
1
mA/mA
mA/mA
UNITS
U
3454f
MHz
C
mΩ
mΩ
mV
mV
mV
mA
µA
µA
µA
µA
µA
µA
µs
V
V
V
V
V
V
A