LTC3207-1_15 Datasheet, PDF (6/20 Pages) Linear Technology – 600mA Universal Multi-Output LED/CAM Driver

LTC3207/LTC3207-1
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted
CAM Pin Dropout Voltage
vs CAM Pin Current
500
V_BAT = 3.6V
400
300
200
100
0
50 100 150 200 250 300 350 400
CAM PIN CURRENT (mA)
3207 G16
ULED Pin Dropout Voltage
vs ULED Pin Current
180
V_BAT = 3.6V
160
140
120
100
80
60
40
20
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
ULED PIN CURRENT (mA)
3207 G19
ULED Pin Current
vs ULED Pin Voltage
30
V_BAT = 3.6V
25
20
15
10
5
0
0.00
0.06 0.12 0.18 0.24 0.30
ULED PIN VOLTAGE (V)
3207 G17
CAM Efficiency vs V_BAT Voltage
100
90
80
70
60
50
40
30
20 _{300mA LED CURRENT}
10 ^{(TYP V}F ^{AT 300mA = 3.6V,}
AOT-2015HPW)
0
3.0 3.5 4.0 4.5
V_BAT VOLTAGE (V)
5.0 5.5
3207 G20
ULED Current vs Input Code
28
24
20
16
12
8
4
0
0 1 0A 13 1C 25 2E 37 3F
INPUT CODE (HEX)
3207 G18
12-LED ULED Display Efficiency
vs V_BAT Voltage
100
90
80
70
60
50
40
30
20 _{12 LEDS AT 15mA/LED}
10 ^{(TYP V}F ^{AT 15mA = 3.2V,}
NICHIA NSCW100)
0
3.0 3.5 4.0 4.5
V_BAT VOLTAGE (V)
5.0 5.5
3207 G21
PIN FUNCTIONS
CPO (Pin 1): Output of the Charge Pump. Used to power
all LEDs. A 4.7µF X5R or X7R ceramic capacitor should
be connected to ground.
ULED1-ULED12 (Pins 2-6,12-18): Current Source Outputs
for Driving LEDs. The LED current can be set from 0mA
to 27.5mA in 64 steps via software control and internal
6-bit linear DAC. Each output can be disabled by setting
the associated data register REG1 to REG12 low. ULED1
to ULED12 can also be used as I²C controlled open-drain
general purpose outputs. Connect unused outputs to
ground.
6
CAM (Pin 7): Current Source Output for the CAM Display
White LED. The LED on the CAM display can be set from
0mA to 425mA in 16 steps via software control and in-
ternal 4-bit linear DAC. Two 4-bit registers are available.
One is used to program the high camera current and the
second the low camera current. These registers can be
selected via the serial port or the CAMHL pin. The output
can be disabled by setting data in REG13 low. A safety
timer will disable the output after two seconds whenever
the high camera current mode is selected (see Applica-
tions Information).
3207fc