LP8860-Q1 Datasheet, PDF (9/112 Pages) Texas Instruments – Low-EMI, High-Performance 4-Channel LED Driver for Automotive Lighting

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LP8860-Q1
SNVSA21C – MAY 2014 – REVISED DECEMBER 2015
Current Sinks Electrical Characteristics (continued)
Limits apply over the full ambient temperature range –40°C ≤ T_A ≤ 125°C. Unless otherwise specified: V_DD = 3.3 V, V_IN = 12
V, EN/VDDIO = 3.3 V, L = 22 μH, C_IN = 2 × 10 μF ceramic and 33 μF electrolytic, C_OUT = 2 × 10 μF ceramic and 33 μF
electrolytic, C_VDD = 1 μF, C_CPUMP = 10 μF, Q = IPD25N06S4L-30-ND, D = SS5P10-M3/86A.
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
ƒ_{LED_PWM}
LED PWM output frequency PWM_FREQ[3:0] = 0000b
for display mode
PWM_FREQ[3:0] = 1111b
4883
39 063
Hz
ƒ_PWM
t_{PWM MIN}
PWM input frequency
Minimum on and off time for
PWM input
BRT_MODE[1:0] = 00, 01 and 10
100
500 Hz
400
ns
I_DIM
Dimming ratio (input
resolution)
External 100 Hz PWM
SPI or I²C control
13 000:1
16
bit
PWM_RES
ΔI_OUT
V_SAT
ƒ_{LED_PWM} = 5 kHz, ƒ_OSC = 5 MHz
ƒ_{LED_PWM}= 10 kHz, ƒ_OSC = 5 MHz
PWM output resolution, PWM
control for BRT_MODE[1:0] =
00, 01, and 10 (without
dithering)
ƒ_{LED_PWM} = 20 kHz, ƒ_OSC = 5 MHz
ƒ_{LED_PWM} = 40 kHz, ƒ_OSC = 5 MHz
ƒ_{LED_PWM} = 5 kHz, ƒ_OSC = 40 MHz
ƒ_{LED_PWM} = 10 kHz, ƒ_OSC = 40 MHz
ƒ_{LED_PWM} = 20 kHz, ƒ_OSC = 40 MHz
ƒ_{LED_PWM} = 40 kHz, ƒ_OSC = 40 MHz
Individual output current
adjustment range
DRV_OUTx_CORR[3:0] = 1111
DRV_OUTx_CORR[3:0] = 0000
Saturation voltage⁽²⁾
I_OUT = 150 mA
DRV_LED_FAULT_THR[1:0] = 00
10
9
8
7
13
12
11
10
–7.4%
6.5%
0.5
3.6
bits
0.75 V
V_{SHORT_FAULT_TH LED short detection threshold} ^{DRV_LED_FAULT_THR[1:0] = 01}
R
DRV_LED_FAULT_THR[1:0] = 10
3.6
V
6.9
DRV_LED_FAULT_THR[1:0] = 11
10.6
(2) Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at 1 V.
6.7 Boost Converter Characteristics
Limits apply over the full ambient temperature range – 40°C ≤ T_A ≤ 125°C. Unless otherwise specified: V_DD = 3.3 V, V_IN = 12
V, EN/VDDIO = 3.3 V, L = 22 μH, C_IN = 2 × 10 μF ceramic and 33-μF electrolytic, C_OUT = 2 × 10 μF ceramic and 33-μF
electrolytic, C_VDD = 1 μF, C_CPUMP = 10 μF, Q = IPD25N06S4L-30-ND, D = SS5P10-M3/86A.
PARAMETER
TEST CONDITIONS
MIN
TYP MAX UNIT
I_LOAD
V_OUT/V_IN
ƒ_SW
Maximum continuous load
current
Conversion ratio
V_IN = 6 V, V_BOOST = 48 V (ƒ_SW = 303 kHz)
V_IN = 3 V, V_BOOST = 30 V (ƒ_SW = 1.1 MHz)
V_IN = 3 V, V_BOOST = 30 V (ƒ_SW = 2.2 MHz)
Switching frequency (central
frequency if spread spectrum
is enabled)
BOOST_FREQ = 000
BOOST_FREQ = 001
BOOST_FREQ = 010
BOOST_FREQ = 011
BOOST_FREQ = 100
BOOST_FREQ = 101
BOOST_FREQ = 110
BOOST_FREQ = 111
600
150
100
–7%
100
200
303
400
629
800
1100
2200
mA
10
7% kHz
t_BOOST
START-UP
Start-up time ⁽¹⁾
50
ms
(1) Start-up time is measured from the moment the boost is activated until the V_OUT crosses 90% of its initial voltage value.
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