LTC3452 Datasheet, PDF (2/16 Pages) Linear Technology – Synchronous Buck-Boost MAIN/CAMERA White LED Driver

LTC3452
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN, PV_IN, SW1, SW2, V_OUT Voltage ........... – 0.3V to 6V
LED_L1 to LED_L5 Voltage ... – 0.3V to (V_OUT + 0.3V) or 6V
LED_H1, LED_H2 Voltage ..... – 0.3V to (V_OUT + 0.3V) or 6V
V_C, EN_L, EN_H,
I_SETL, I_SETH Voltage ............ – 0.3V to (V_IN + 0.3V) or 6V
LED_L1 to LED_L5 Current ....................................... 50mA
LED_H1, LED_H2 Current ....................................... 250mA
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range ................ – 65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
20 19 18 17 16
V_IN 1
EN_L 2
I_SETL 3
LED_L1 4
LED_L2 5
15 V_C
14 EN_H
21
13 I_SETH
12 LED_H2
11 GND
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm × 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 40°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER UF PART MARKING
LTC3452EUF
3452
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 specifications which apply over the full operating temperature range, otherwise specifications are T_A = 25°C.
V_IN = PV_IN = V_OUT = 3.6V unless otherwise specified. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
Input Supply Voltage (V_IN)
● 2.7
5.5
Input DC Supply Current
Normal Operation
Shutdown
UVLO
2.7V ≤ V_IN ≤ 5.5V, R_ISETL = R_ISETH = 51.1k, I_LEDx = 0 (Note 4)
2.7V ≤ V_IN ≤ 5.5V, V_ENL = V_ENH = 0V
V_IN < UVLO Threshold
0.6
1
6.5 18
3
5
Undervoltage Lockout Threshold
V_IN Rising
V_IN Falling
●
2.0 2.3
1.6 1.87
EN_L,H DC Threshold for Normal Operation (V_IH) 2.7V ≤ V_IN ≤ 5.5V, V_ENL,H Rising
●
0.54 1.2
EN_L,H DC Threshold for Shutdown (I_LEDx = 0)
(V_IL)
2.7V ≤ V_IN ≤ 5.5V, V_ENL,H Falling
● 0.2 0.52
EN_L,H Input Current (I_IH, I_IL)
2.7V ≤ V_IN ≤ 5.5V
● –1
1
EN_L PWM Frequency
2.7V ≤ V_IN ≤ 5.5V (Note 5)
● 10
I_SETL,H Servo Voltage
R_ISETL = R_ISETH = 20k
788 800 812
● 780 800 812
LED_Hx Output Current Ratio (I_LEDHx/I_SETH)
I_LEDHx = 100mA, V_LEDHx = 300mV
730 768 806
● 714 768 806
LED_Hx Output Current Matching
LED_Hx Pin Voltage
(Max – Min)/[(Max + Min)/2] • 100%, I_LEDHx = 100mA,
V_LEDHx = 300mV, 2.7V ≤ V_IN ≤ 5.5V
I_LEDHx = 100mA
1
6
250
UNITS
V
mA
µA
µA
V
V
V
V
µA
kHz
mV
mV
mA/mA
mA/mA
%
mV
3452f
2