time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
1
IS31LT3354
PIN CONFIGURATION
Package
Pin Configuration (Top view)
SOT23-5
PIN DESCRIPTION
Pin Name
NO. Description
GATE
1
Output gate driver for an external NMOSFET
GND
2
Ground (0V)
Multi-function On/Off and brightness control pin:
* Leave floating for normal operation.(V
ADJ
= V
REF
= 1.2V giving nominal average output current
I
OUT nom
=0.1/R
S
)
* Drive to voltage below 0.2V to turn off output current
ADJ
3
* Drive with DC voltage (0.3V<V
ADJ
<1.2V) to adjust output current from 25% to 100% of I
OUTnom
* Drive with PWM signal to adjust output current.
* When driving the ADJ pin above 1.2V, the current will be clamped to 100% brightness
automatically.
Connect resistor R
S
from this pin to V
IN
to define nominal average output current I
OUTnom
I
SENSE
4
=0.1/R
S
Input voltage (6V to 40V). Decouple to ground with 1μF or higher X7R ceramic capacitor close
V
IN
5
to device
ORDERING INFORMATION
INDUSTRIAL RANGE: -40°C TO +85°C
Order Part No.
IS31LT3354–STLS2-TR
Package
SOT23-5, Lead-free
QTY/Reel
3000
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
2
IS31LT3354
ABSOLUTE MAXIMUM RATINGS
(NOTE 1)
Symbol Parameter
V
IN
V
ISENSE
V
GATE
V
ADJ
P
tot
T
OP
T
ST
T
j MAX
R
JA
Input voltage
I
SENSE
voltage
GATE pin voltage
Adjust pin input voltage
Power dissipation
Operating temperature
Storage temperature
Junction temperature
Junction to ambient
ESD Susceptibility (human body model)
Rating
-0.3V to +50V
V
IN
+0.3V to V
IN
-5V ,V
IN
>5V
V
IN
+0.3V to -0.3V,V
IN
<5V
-0.3V to +6V
-0.3V to +6V
600mW @SOT23-5
-40 to 85°C
-55 to 150°C
150°C
108°C/W @SOT23-5
4kV
ELECTRICAL CHARACTERISTICS
T
A
= 25°C
(Note 2)
Symbol
V
IN
I
INQoff
I
INQon
V
SENSE
V
SENSEHYS
I
SENSE
V
REF
V
ADJ
V
ADJoff
V
ADJon
R
ADJ
Parameter
Input voltage
Quiescent supply current with output off
Quiescent supply current with output
switching
Mean current sense threshold voltage
Sense threshold hysteresis
I
SENSE
pin input current
Internal reference voltage
External control voltage range on ADJ pin for
dc brightness control
DC voltage on ADJ pin to switch chip from
active (on) state to quiescent (off) state
DC voltage on ADJ pin to switch chip from
quiescent (off) state to active (on) state
Resistance between ADJ pin and V
REF
V
ADJ
falling
V
ADJ
rising
V
SENSE
= 0.1V
Measured on ADJ pin
with pin floating
0.3
0.15
0.2
0.2
0.25
500
ADJ pin grounded
ADJ pin floating
91
Conditions
Min.
6
80
95
450
96
±15
8
1.2
1.2
0.25
0.3
10
Typ.
Max.
40
110
600
101
Unit
V
μA
μA
mV
%
μA
V
V
V
V
KΩ
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
3
IS31LT3354
ELECTRICAL CHARACTERISTICS
T
A
= 25°C, V
IN
= 12V (Note 3)
Symbol Parameter
I
source
Gate sourcing current
I
sink
Gate sinking current
D
PWM(LF)
Brightness control range at low
frequency PWM signal
Conditions
Min.
Typ.
80
100
1200:1
Max.
Unit
mA
mA
PWM frequency =100Hz PWM
amplitude=5V,Vin=15V,
L=27uH, Driving 1 LED
PWM frequency =10KHz PWM
amplitude=5V,Vin=15V,
L=27uH, Driving 1 LED
ADJ pin floating
L=100μH (0.82Ω) I
OUT
=350mA
@ V
LED
=3.4V Driving 1 LED
D
PWM(HF)
Brightness control range at low
frequency PWM signal
13:1
f
SW
T
ONmin
T
OFFmin
f
SWmax
D
SW
T
PD
T
SD
T
SD-HYS
Operating frequency
Minimum switch ‘ON’ time
Minimum switch ‘OFF’ time
Recommended maximum
operating frequency
Recommended duty cycle range
of output switch at f
SWmax
Internal comparator propagation
delay
Thermal shutdown temperature
Thermal shutdown hysteresis
154
200
200
1
0.3
0.7
50
140
20
0.9
KHz
ns
ns
MHz
ns
°C
°C
Notes:
1. Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is
not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2. All parts are production tested at T
A
= 25°C. Other temperature limits are guaranteed by design
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