a8430 Allegro MicroSystems, Inc., a8430 Datasheet - Page 2

• Manufacturer Part Number: a8430
• Description: White Led Driver Constant Current Step-up Converter
• Manufacturer: Allegro MicroSystems, Inc.

Note 1. Measured with 4-layer PCB. Please refer to application note “Package Thermal Characteristics,“ for thermal perfor-
mance measurement for 3 mm x 3 mm MLP package for additional information.
ELECTRICAL CHARACTERISTICS
Input Voltage Range
Supply Current
Feedback Reference Voltage
Feedback Input Current
Switch Current Limit
Switch Frequency
Switch Maximum Duty Cycle
Switch Saturation voltage
Switch Leakage Current
Enable Input
Input Threshold Low
Input Threshold High
Input Leakage
VIN
EN
White LED Driver Constant Current Step-up Converter
Characteristics
Enable
1.25 V
V
REF
95 mV
FB
Leakage
Symbol
V
I
CE(SAT)
at T
V
SWLIM
I
F
V
V
A1
V
SUP
I
I
Functional Block Diagram
REF
D
FB
SW
SL
IN
IH
IL
A
= 25°C, V
–
Active: I
V
Shutdown (EN = 0 V)
–
–
–
–
–
–
–
–
–
I
IL
LOAD
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
R
C
C
IN
C
= 12 V
= 3 V (unless otherwise noted)
Test Conditions
LOAD
GND
Generator
Oscillator
1.2 MHz
Ramp
Σ
= 15 mA,
A2
R
S
Min.
2.5
0.8
1.5
86
85
–
–
–
–
–
–
–
–
Q
Typ.
300
350
2.5
0.1
1.2
95
20
90
–
–
–
–
–
Driver
Max.
104
3.5
1.6
0.4
10
75
1
5
–
–
–
–
1
A8430
SW
Units
MHz
mA
mV
mA
mV
µA
nA
µA
µA
%
V
V
V
2