A8500EECTR-T Allegro Microsystems Inc, A8500EECTR-T Datasheet - Page 4

• Manufacturer Part Number: A8500EECTR-T
• Description: IC,Laser Diode/LED Driver,LLCC,28PIN,PLASTIC
• Manufacturer: Allegro Microsystems Inc
• Type: Backlight, White LED, RGBr

Specifications of A8500EECTR-T

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 8
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: RGB, White LED
• Frequency: 2MHz
• Voltage - Supply: 4.2 V ~ 5.5 V
• Voltage - Output: 28V
• Mounting Type: Surface Mount
• Package / Case: 26-WFQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 25mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1204-2

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A8500
ELECTRICAL CHARACTERISTICS, valid at T
Input Voltage Range
Undervoltage Lockout Threshold
UVLO Hysteresis Window
Supply Current
APWM Frequency Range
Error Amplifier
Error Amplifier Open Loop Gain
Error Amplifier Unity Gain Bandwidth
Error Amplifier Transconductance
Error Amplifier Output Sink Current
Error Amplifier Output Source Current
Boost Controller
Switching Frequency
Minimum Switch Off-Time
Logic Input Levels (APWM , EN, MODE, PWM, SELx, and SKIP pins unless otherwise specified)
Input Voltage Level Low
Input Voltage Level High
Input Leakage Current (APWM, EN,
PWM, and SKIP pins)
Input Leakage Current (SELx pins)
Over Voltage Protection (OVP)
Output Overvoltage Rising Limit
OVP Sense Current
OVP Release Current
OVP Leakage Current
Boost Switch
Switch On Resistance
Switch Leakage Current
Switch Current Limit
Characteristics
V
Symbol
I
I
UGB
t
I
EAsource
R
I
V
OVPleak
UVLOhys
f
Gm
I
OFFmin
SELleak
I
I
V
I
SWleak
APWM
A
EAsink
I
I
OVPH
SWlim
OVPL
f
V
UVLO
V
ds(on)
SUP
V
Ileak
VEA
SW
OVP
IN
IH
IL
EA
EA
A
= –40°C to 85°C, typical values at T
V
Switching at no load
Shutdown EN = PWM = APWM = V
∆I
V
V
R
R
R
V
ROVP = 0 Ω
V
I
V
V
SW
IN
LED1-8
LED1-8
I(pin)
VOP
SW
SW
FSET
FSET
FSET
COMP
falling
= 1.5 A
= 5 V, T
= 21 V
= 21 V
= 5 V, T
= 13 kΩ, SKIP = V
= 32.4 kΩ, SKIP = V
= 26.1 kΩ, SKIP = V
= ±10 μA
= 1 V
= 0 V
A
Flexible WLED/RGB Backlight Driver
A
= 25°C
= 25°C
Test Conditions
IL

IH
IL

A
IL
, T
= 25°C, V
A
= 25°C
for Medium Size LCDs
IN
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
= 5 V, unless otherwise noted
Min.
4.2
1.8
1.5
1.8
20
28
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–280
Typ.
54.9
47.8
850
280
200
225
0.2
0.1
0.1
60
70
–
–
5
–
3
2
1
–
–
–
–
–
–
1
2
Max.
2000
100
5.5
2.2
0.4
34
4
–
–
1
–
–
–
–
–
–
–
–
–
1
–
–
–
–
1
–
–
Units
μA/V
MHz
MHz
MHz
kHz
kHz
mΩ
mA
μA
dB
μA
μA
μA
μA
μA
μA
μA
μA
μA
ns
V
V
V
V
V
V
A
4