ltc3207euf-trpbf Linear Technology Corporation, ltc3207euf-trpbf Datasheet - Page 6

• Manufacturer Part Number: ltc3207euf-trpbf
• Description: 600ma Universal Multi-output Led/cam Driver
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
LTC3207/LTC3207-1
TYPICAL PERFORMANCE CHARACTERISTICS
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 I
general purpose outputs. Connect unused outputs to
ground.
6
180
160
140
120
100
500
400
300
200
100
80
60
40
20
0
0
50
0
ULED Pin Dropout Voltage
vs ULED Pin Current
CAM Pin Dropout Voltage
vs CAM Pin Current
V
V
BAT
2 4
BAT
100
= 3.6V
= 3.6V
6
ULED PIN CURRENT (mA)
CAM PIN CURRENT (mA)
150
8
10 12
200
14 16
250
18
300
20
22
350
24
2
3207 G19
3207 G16
C controlled open-drain
26
400
28
100
30
25
20
15
10
90
80
70
60
50
40
30
20
10
5
0
0
0.00
3.0
CAM Effi ciency vs V
ULED Pin Current
vs ULED Pin Voltage
V
300mA LED CURRENT
(TYP V
AOT-2015HPW)
BAT
= 3.6V
0.06
3.5
F
AT 300mA = 3.6V,
ULED PIN VOLTAGE (V)
V
BAT
0.12
4.0
VOLTAGE (V)
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).
0.18
4.5
BAT
Voltage
0.24
5.0
3207 G17
3207 G20
T
A
0.30
5.5
= 25°C unless otherwise noted
100
28
24
16
12
20
90
80
70
60
50
40
30
20
10
0
8
4
0
3.0
0
12-LED ULED Display Effi ciency
vs V
ULED Current vs Input Code
12 LEDS AT 15mA/LED
(TYP V
NICHIA NSCW100)
1
BAT
3.5
F
0A
Voltage
AT 15mA = 3.2V,
INPUT CODE (HEX)
V
BAT
13
4.0
VOLTAGE (V)
1C
4.5
25
2E
5.0
37
3207 G18
3207 G21
3207fc
3F
5.5