LTC3454 datasheet(2/12 Pages) LINER

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LTC3454

3454fa

VIN, SW1, SW2, VOUT Voltage......................–0.3V to 6V

VC, EN1, EN2, ISET1, ISET2

Voltage.............................–0.3V to (VIN + 0.3V) or 6V

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

(Note 1)

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC3454EDD#PBF

LTC3454EDD#TRPBF

LBQX

10-Lead (3mm

× 3mm) Plastic DFN

–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/

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

TOP VIEW

DD PACKAGE

10-LEAD (3mm

3mm) PLASTIC DFN

SW1

VIN

VOUT

SW2

EN1

EN2

ISET1

ISET2

LED

TJMAX = 125°C, θJA = 40°C/W

EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 3.6V, RISET = 20.5k unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Voltage (VIN)

2.7

5.5

Input DC Supply Current

Normal Operation

Shutdown

UVLO

(Typicals at VIN = 3.6V, RISET1 = RISET2 = 20.5k)

2.7V ≤ VIN ≤ 5.5V (Note 4)

2.7V ≤ VIN ≤ 5.5V, VEN1 = VEN2 = 0V

VIN < UVLO Threshold, VEN1 = VEN2 = VIN

825

1200

μA

Undervoltage Lockout Threshold

VIN Rising

VIN Falling

1.75

2.05

1.90

2.3

VEN1, VEN2 DC Threshold for Normal Operation (VIH)

0.68

1.2

VEN1, VEN2 DC Threshold for Shutdown (VIL)

0.2

0.66

VEN1, VEN2 Input Current

–1

μA

ISET1 and ISET2 Servo Voltage

3.08k ≤ RISET1||RISET2 ≤ 20.5k

780

788

800

812

LED Output Current to Programming Current Ratio

ILED/(IISET1 + IISET2), ILED = 500mA (Note 5)

3725

3775

3850

3975

3925

mA/mA

LED Pin Voltage

ILED = 1A

105

Regulated Maximum VOUT

LED Pin Open, Programmed ILED = 1A

4.95

5.15

5.35

PMOS Switch RON

Switches A and D (VOUT = 3.6V)

170

mΩ

NMOS Switch RON

Switches B and C

130

mΩ

Forward Current Limit

Switch A

2.5

3.4

Reverse Current Limit

Switch D (VOUT = 3.6V)

275

PMOS Switch Leakage

Switches A, D

–1

μA

NMOS Switch Leakage

Switches B, C

–1

μA

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