SC658 Datasheet, PDF (3/22 Pages) Semtech Corporation – Backlight Driver for 4 LEDs with SemPulseTM Interface

SC658
Absolute Maximum Ratings
Recommended Operating Conditions
IN, OUT (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to +6.0
C1+, C2+ (V). . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to (V_OUT+ 0.3)
Pin Voltage — All Other Pins (V). . . . . . . . . -0.3 to (V_IN+ 0.3)
OUT Short Circuit Duration. . . . . . . . . . . . . . . .Continuous
ESD Protection Level⁽¹⁾ (kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ambient Temperature Range (°C). . . . . . . . . -40 ≤ T_A ≤ +85
Input Voltage (V) . . . . . . . . . . . . . . . . . . . . . . . 2.9 ≤ V_IN ≤ 5.5
Output Voltage (V) . . . . . . . . . . . . . . . . . . . . .2.5 ≤ V_OUT ≤ 5.25
Voltage Difference between any two LEDs (V). . ∆V_F < 1.0⁽²⁾
Thermal Information
Thermal Resistance, Junction to Ambient⁽³⁾ (°C/W) . . 127
Maximum Junction Temperature (°C). . . . . . . . . . . . . . . +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114
(2) ∆V_F(max) = 1.0V when V_IN = 2.9V, higher V_IN supports higher ∆V_F(max)
(3) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB per JESD51 standards.
Electrical Characteristics
Unless otherwise noted, T_A = +25°C for Typ, -40°C to +85°C for Min and Max, T_J(MAX) = 125°C, V_IN = 3.7 V, C_IN= C₁= C₂= C_OUT = 2.2µF (ESR = 0.03Ω)⁽¹⁾
Parameter
Symbol
Conditions
Min Typ Max Units
Shutdown Current
I_Q(OFF)
0.1
2
µA
Total Quiescent Current
Maximum Total Output Current
Backlight Current Setting
Backlight Current Matching
Backlight Current Accuracy
All
outputs
disabled,
SPIF
=
V (2)
IN
60
100
µA
Charge pump enabled, 1x Mode, all LEDs on,
1.4
I_BLn = 0.5mA
I_Q
Charge pump in 1x mode, 2.9V <V_IN < 4.2V, all LEDs
4.2
mA
on, I_BLn = 25mA
Charge pump in 1.5x, 2x mode, 2.9V <V_IN < 4.2V, all
5.3
LEDs on, I_BLn = 25mA
I_OUT(MAX)
V_IN > 2.9V, sum of all active LED currents,
100
V_OUT(MAX) = 4.2V
mA
I_BLn
Nominal setting for BL1 thru BL4
0
25
mA
I_BL-BL
I_BLn = 12mA⁽³⁾
-3.5 ±0.5 +3.5
%
I_{BL_ACC}
I_BLn = 12mA
-8 ±1.5 +8
%