PRODUCT DATASHEET
AAT1239-1
SwitchReg
TM
Electrical Characteristics
1
T
A
= -40°C to +85°C unless otherwise noted. Typical values are at 25°C, V
IN
= 3.6V.
Symbol
Power Supply
PV
IN
, V
IN
V
OUT(MAX)
I
Q
I
SHDN
I
OUT
ΔV
LINEREG(FB)
/ΔV
IN
R
DS(ON) L
R
DS(ON) IN
T
SS
V
OVP
I
LIMIT
T
SD
T
HYS
SEL, EN/SET
V
SEL(L)
V
SEL(H)
V
EN/SET(L)
V
EN/SET(H)
T
EN/SET (LO)
T
EN/SET(HI)
T
OFF
T
LAT
I
EN/SET
AAT1239-1
V
FB
FB Pin Regulation
V
IN
= 2.7V to 5.5V, SEL = GND,
EN/SET = DATA16
V
IN
= 2.7V to 5.5V, SEL = HIGH,
EN/SET = HIGH
0.085
0.54
0.1
0.6
1.115
V
0.66
40V Step-Up Converter for 4 to 10 White LEDs
Description
Input Voltage Range
Maximum Output Voltage
Operating Current
Shutdown Current
Maximum Continuous Output
Current
2
Line Regulation
Low Side Switch On Resistance
Input Disconnect Switch
On Resistance
Soft-Start Time
Over-Voltage Protection Threshold
Over-Voltage Hysteresis
N-Channel Current Limit
T
J
Thermal Shutdown Threshold
T
J
Thermal Shutdown Hysteresis
SEL Threshold Low
SEL Threshold High
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
EN/SET High Time
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
Conditions
Min
2.7
Typ
Max
5.5
40
70
1.0
30
Units
V
V
μA
μA
mA
%
mΩ
mΩ
μs
SEL = GND, FB = 0.1V
EN/SET = GND
2.7V < V
IN
< 5.5V, V
OUT
= 40V
V
IN
= 2.7V to 5.5V, V
FB
= 0.6V
0.7
135
180
From Enable to Output Regulation;
V
FB
= 300mV
V
OUT
Rising
V
OUT
Falling
400
1.1
1.2
100
2.5
140
15
1.3
V
mV
A
°C
°C
V
V
V
V
μs
μs
μs
μs
μA
0.4
1.4
0.4
V
EN/SET
V
EN/SET
V
EN/SET
V
EN/SET
V
EN/SET
<
>
<
>
=
0.6V
1.4V
0.6V
1.4V
5V V
IN
= 5V
1.4
0.3
75
75
500
500
1
-1
1. Specification over the -40°C to +85°C operating temperature range is assured by design, characterization, and correlation with statistical process controls.
2. Maximum continuous output current increases with reduced output voltage, but may vary depending on operating efficiency and thermal limitations.
4
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1239-1.2008.10.1.2
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