A6274-1 Datasheet PDF - Allegro MicroSystems
| Part Number | A6274-1 | |
| Description | Linear Current Regulator and Controller | |
| Manufacturers | Allegro MicroSystems | |
| Logo |  |
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A6274, A6274-1
A6284, A6284-1
Linear Current Regulator and Controller
for Automotive LED Arrays
FEATURES AND BENEFITS
• Six LED current sinks rated up to 60 mA (A6274) or
120 mA (A6284)
• Total LED drive current—up to 360 mA or 720 mA
• Wide input voltage range of 5 to 42 V for start/stop, cold-
crank, and load-dump requirements
• Low-dropout voltage—drives two series WLEDs from
7 V input
• Gate driver for external ballast P-MOSFET
• LEDs combined in two groups with separate ENx and
ISETx
• LED current level set by external reference resistors
• Internal or external PWM dimming
• Controlled output drivers slew during PWM for lower
EMI
• Fault detection features: LED string open, LED pin
short-to-ground, single LED short, VOUT short-to-
ground, VIN overvoltage, and thermal protection
• Input supply and temperature-based derating
• Automotive K-temperature range (–40°C to 150°C)
PACKAGES:
20-Pin eTSSOP (LP) with Exposed Thermal Pad
AEC-Q100 qualified
DESCRIPTION
The A6274 and A6284 are programmable linear current
regulator ICs for driving automotive LED arrays. The LED
current is programmed by external resistors. These devices
sink up to 60 mA (A6274) or 120 mA (A6284), from each of
six LED pins, to drive strings of high-brightness LEDs. LED
pins can be paralleled to drive even higher current LED strings.
Current settings are typically accurate to 2%, while typical
matching between LED strings is 0.8%.
LED light output can be adjusted by PWM dimming. The ICs
provide an internal PWM dimming circuit that is programmed
by external resistors for PWM frequency and duty cycle. It
can also accept an external PWM signal. Multiple ICs can be
configured in parallel for larger lighting systems. An internal
FULL (VDR > 3.6 V) option is provided to override the PWM-
dimming ratio for full LED current.
LED current derating with temperature and programmable
VIN levels allows operation over a wide range of operating
conditions.
Continued on next page...
APPLICATIONS
• Automotive rear combination light
• DRL/position
• General automotive lighting
Not to scale
Q1
C2
DIM
FULL
D1
D2
D3 C1
R1
C5
EN1
EN2
R2
R3 R4
FFn
R6
R5
R7
R8
R9
C3
GATE COMP OUT
VIN LED1
LED2
EN1 LED3
EN2 LED4
BIAS A6274-84 LED5
VTH
LED6
FFn GND
DR
PWMIN
ISET1
ISET2
C4
A6274-84-DS, Rev. 1
Figure 1: Typical Application Diagram for “-1” Latching Version
|
| |
 
A6274, A6274-1
A6284, A6284-1
Linear Current Regulator and Controller
for Automotive LED Arrays
ELECTRICAL CHARACTERISTICS: Valid at VIN = 14 V, VENx = 3.3 V; ● indicates specifications across the full operating temperature
range with TJ = –40°C to 150°C; other specifications are at TJ = 25°C, unless noted otherwise. Refer to Figure 1 for typical application circuit.
Characteristics
Symbol
Test Conditions
Min. Typ.
Max.
Unit
INPUT SPECIFICATIONS
Operating Input Voltage Range
Input Quiescent Current 1
Input Sleep Supply Current 1
INTERNAL BIAS CIRCUIT
VIN
IQ
IQSLEEP
VENx = high, FULL mode
VEN1 = VEN2 = 0 V; VDR = VBIAS
●5
–
●–
–
–
–
42 V
6 mA
6 μA
BIAS Pin Voltage
VBIAS
BIAS Pin Dropout
VBIASDROP
VBIAS Undervoltage Release Threshold
VBIASSTART
VBIAS Undervoltage Lockout Stop Threshold
VBIASSTOP
P-CHANNEL MOSFET DRIVER SPECIFICATION
IBIAS = 0 to 7 mA, 5.6 V ≤ VIN ≤ 18 V
Minimum voltage drop across VIN and
BIAS pins. IBIAS < 7 mA, VIN = 5 V
VIN rising
VIN falling
● 4.75
–
●–
●–
5
0.3
–
–
5.25
–
4.6
4.2
V
V
V
V
GATE Sink Current 1
GATE Maximum Voltage (w.r.t. VIN)
GATE Minimum Voltage (w.r.t. VIN)
PMOS Detect Threshold
IGATE(SINK)
VGATE(MAX)
VGATE(MIN)
VGATE(PMOS)
Due to on-chip current limit, 10 V < VIN < 18 V
Due to on-chip current limit, VIN = 5 V
VIN – VGATE, VLEDx = 0.3 V
VIN – VGATE, VLEDx = 1 V
Voltage measured (VIN – VGATE) at end of
startup to detect PMOS connected
4–
– mA
2–
– mA
8 10 12
V
– 130 360 mV
– 600
–
mV
LEDx CURRENT DRIVER SPECIFICATION
LEDx Regulation Voltage 2a
VLEDreg
A6274; not in derating
A6284; not in derating
●–
●–
0.4 0.7
0.55 0.85
V
V
LEDx Accuracy 3
LEDx Matching 4
Maximum LEDx Current
ErrLEDx
Measured at ILED(MAX), LEDx mismatch < 0.5 V,
5 V < VIN < 18 V, TJ = 0°C to 150°C
– 2 3.5
ΔILEDx
ISET2 connected to BIAS; compared to
average ILEDx, measured at ILED(MAX), LEDx ●
mismatch < 1 V, 5 V < VIN < 18 V
–
0.8
3
ILED(MAX)
A6274
A6284
●–
●–
60
120
–
–
%
%
mA
mA
Minimum LEDx Current
ILED(MIN)
A6274
A6284
– 6 – mA
– 12 – mA
Maximum LED Current, ISETx Pin Short-to-
Ground 2
A6274
ILED(ISETshrt) A6284
– 66
– 129
–
–
mA
mA
LED Current Ramp Time
ISETx to ILEDx Gain
tRAMP
gILED
ILEDx 10% to 90% and 90% to 10%
A6274
A6284
–8
– 248
– 492
–
–
–
μs
A/A
A/A
ISETx Voltage Level
VISET
0.015 mA ≤ IISETx ≤ 0.3 mA
– 1.2
–
V
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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| Information | Total 24 Pages | |
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| Download | [ A6274-1.PDF Datasheet ] | |
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