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LT3476 Datasheet(PDF) 3 Page - Analog Devices

Part # LT3476
Description  I2C Programmable Quad Monolithic Boost LED Driver
PDF  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3476 Datasheet(HTML) 3 Page - Analog Devices

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LT3966
3
Rev. 0
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
EN/UVLO Bias Current Low
EN/UVLO = 1.15V
2
µA
EN/UVLO Bias Current High
EN/UVLO = 1.3V
10
100
nA
LDO Regulator
INTVCC Regulation Voltage
IINTVCC = –1mA, Not Switching
l
2.9
3
3.1
V
INTVCC Line Regulation
3V ≤ VIN ≤ 60V
0.03
%/V
INTVCC Load Regulation
–20mA ≤ IINTVCC ≤ 0mA, Not Switching
0.04
%/mA
INTVCC Undervoltage Lockout
INTVCC Falling
l
2.6
2.7
2.8
V
INTVCC Undervoltage Lockout Hysteresis
INTVCC Rising
75
mV
INTVCC Current Limit
VIN = 12V, INTVCC = 2.8V
36
mA
INTVCC Dropout Voltage
VIN = 3V, IINTVCC = –15mA
320
mV
Analog-to-Digital Converter
Converter Resolution
8
Bits
Converter Full-Scale Voltage
1.266
1.275
1.284
V
Converter LSB Size
4.95
5
5.05
mV
Conversion Time (tCONV)
Rt = 100kΩ, MPHASE = 0, AUTO = 0
20
µs
EXT1, EXT2 Input Impedance
VEXT1 = VEXT2 = 1V
10
100
MΩ
EXT1, EXT2 Internal Voltage Clamp
IEXT1 = IEXT2 = 100μA
l
1.4
1.7
1.9
V
EXT1, EXT2 Internal Voltage Clamp Impedance VEXT1 = VEXT2 = 2V to 5.5V
2.2
kΩ
Channel 1–4 LED Current Sense Amplifiers
ISP Common Mode Voltage Range
l
3
55
V
Full-Scale Current Sense Threshold
(VISP–VISN)
ISP = 55V, CTRL/PWM =1.5V, ADIM[7:0] = 0xFF
ISP = 3V, CTRL/PWM = 1.5V, ADIM[7:0] = 0xFF
l
l
242
242
250
250
255
255
mV
mV
Externally Adjusted Half-Scale Threshold
(VISP–VISN)
ISP = 55V, CTRL/PWM = 0.7V, ADIM[7:0] = 0xFF
ISP = 3V, CTRL/PWM = 0.7V, ADIM[7:0] = 0xFF
l
l
122
122
125
125
128
128
mV
mV
Externally Adjusted 1/10th Scale Threshold
(VISP–VISN)
ISP = 55V, CTRL/PWM = 0.3V, ADIM[7:0] = 0xFF
ISP = 3V, CTRL/PWM = 0.3V, ADIM[7:0] = 0xFF
l
l
20
20
25
25
31
31
mV
mV
Internally Adjusted Half-Scale Threshold
(VISP–VISN)
ISP = 55V, CTRL/PWM = 1.5V, ADIM[7:0] =
0x7F
ISP = 3V, CTRL/PWM = 1.5V, ADIM[7:0] = 0x7F
l
l
121
121
125
125
129
129
mV
mV
Internally Adjusted 1/10th Scale Threshold
(VISP–VISN)
ISP = 55V, CTRL/PWM = 1.5V, ADIM[7:0] =
0x19
ISP = 3V, CTRL/PWM = 1.5V, ADIM[7:0] = 0x19
l
l
20
20
25
25
31
31
mV
mV
Overcurrent Protection Threshold (VISP–VISN) ISP = 60V
370
mV
C/10 Threshold
ISP = 60V
14
22
30
mV
ISP/ISN Input Bias Current (Combined)
CTRL/PWM = 3V (Active), ISP = ISN = 55V
CTRL/PWM = 0V (Standby), ISP = ISN = 55V
440
13
17
µA
µA
PWM Threshold
CTRL/PWM Falling
l
90
103
115
mV
The l denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = 12V unless otherwise noted.



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