LTC3453 Datasheet, PDF (2/12 Pages) Linear Technology – Synchronous Buck-Boost High Power White LED Driver

LTC3453
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN, PV_IN, SW1, SW2, V_OUT Voltage ............ –0.3V to 6V
LED1 to LED4 Voltage ...... –0.3V to (V_OUT + 0.3V) or 6V
V_C, EN1, EN2,
I_SET1, I_SET2 Voltage .......... –0.3V to (V_IN + 0.3V) or 6V
LED1 to LED4 Peak Current ................................ 250mA
Storage Temperature Range .................. –65°C to 125°C
Operating Temperature Range (Note 2) ... –40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
16 15 14 13
V_IN 1
12 V_C
EN1 2
11 EN2
17
I_SET1 3
10 I_SET2
LED1 4
9 LED4
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 40°C/W, θ_JC = 2.6°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER UF PART MARKING
LTC3453EUF
3453
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C, V_IN = V_OUT = 3.6V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Supply Voltage
● 2.7
Input DC Supply Current
Normal Operation
Shutdown
UVLO
2.7V ≤ V_IN ≤ 5.5V, R_ISET1||R_ISET2 = 51.1k, I_LEDx = 0 (Note 4)
2.7V ≤ V_IN ≤ 5.5V; V_EN1 = V_EN2 = 0V
V_IN < UVLO Threshold
Undervoltage Lockout Threshold
V_IN Rising
V_IN Falling
●
1.6
EN1,2 DC Threshold for Normal Operation 2.7V ≤ V_IN ≤ 5.5V, V_EN1,2 Rising
●
EN1,2 DC Threshold for Shutdown (I_LEDx = 0) 2.7V ≤ V_IN ≤ 5.5V, V_EN1,2 Falling
EN1,2 Input Current
V_EN1,2 = 3.6V
● 0.2
● –1
I_SET1,2 Servo Voltage
LED Output Current Ratio
R_ISET1,2 = 4.12k, 0°C ≤ T_A ≤ 85°C
R_ISET1,2 = 4.12k, –40°C ≤ T_A ≤ 85°C
I_LED/(I_SET1 + I_SET2), I_LEDx = 75mA, V_LEDx = 300mV,
2.7V ≤ V_IN ≤ 5.5V
788
● 780
365
● 357
LED Output Current Matching
(MAX – MIN)/[(MAX + MIN)/2] • 100%, I_LEDx = 75mA
V_LEDx = 300mV
LED Pin Drain Voltage
I_LEDx = 75mA
Regulated Maximum V_OUT
PMOS Switch R_ON
V_LEDx = 0V
Switches A and D, @ 100mA
● 4.4
NMOS Switch R_ON
Switches B and C, @ 100mA
Forward Current Limit
Switch A
1125
0.6
6
3
2
1.9
0.65
0.63
800
800
384
384
2
130
4.5
0.3
0.25
1612
5.5
V
1
mA
18
µA
5
µA
2.3
V
V
1
V
V
1
µA
812
mV
812
mV
403 mA/mA
403 mA/mA
6
%
mV
4.6
V
Ω
Ω
2100
mA
Reverse Current Limit
Switch D
200
mA
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