LM3561 Datasheet, PDF (5/36 Pages) Texas Instruments – LM3561 Synchronous Boost Converter with 600mA High Side LED Driver and I 2 C-Compatible Interface

Absolute Maximum Ratings (Note 1, Note
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V_IN, V_SW, V_OUT
V_SCL, V_SDA, V_HWEN, V_STROBE, V_TX1,
V_TX2, V_LED, V_LEDI/NTC
Continuous Power Dissipation(Note 3)
Junction Temperature (T_J-MAX)
Storage Temperature Range
Maximum Lead Temperature
(Soldering)
-0.3V to 6V
-0.3V to (V_IN
+0.3V) w/ 6.0V
max
Internally Limited
+150°C
-65°C to +150°C
(Note 4)
Operating Ratings (Note 1, Note 2)
V_IN
Junction Temperature (T_J)
Ambient Temperature (T_A)
(Note 5)
2.5V to 5.5V
-40°C to +125°C
-40°C to +85°C
Thermal Properties
Junction-to-Ambient Thermal
Resistance (θ_JA), TMD12
Package(Note 6)
68°C/W
ESD Caution Notice National Semiconductor recommends that all integrated circuits be handled with appropriate
ESD precautions. Failure to observe proper ESD handling techniques can result in damage to the device.
Electrical Characteristics
Limits in standard typeface are for T_A = +25°C. Limits in boldface type apply over the full operating ambient temperature range
(-40°C ≤ T_A ≤ +85ºC). Unless otherwise specified, V_IN = 3.6V, V_HWEN = V_IN. (Note 2, Note 7)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Current Source Specifications
600mA Flash LED
-40C ≤ T_A ≤
Setting, V_OUT = 4.5V, _+85C
-5%
600
+6%
I_LED
Current Source Accuracy ^{3V ≤ V}IN ^{≤ 4.2V}
T_A = +25C
-3%
600
+6%
mA
18mA Torch Current Setting, V_OUT = 4.5V,
3V ≤ V_IN ≤ 4.2V
-10%
18
+10%
V_HR
Current Source Regulation
Voltage (V_OUT - V_LED)
600mA setting, V_OUT = 4.5V
240
mV
Step-Up DC/DC Converter Specifications
V_OVP
Output Over-Voltage
On Threshold
Protection Trip Point(Note
8)
Off Threshold
4.90
5
5.05
V
4.88
R_PMOS
PMOS Switch On-
Resistance
I_PMOS = 500mA
270
mΩ
R_NMOS
NMOS Switch On-
Resistance
I_NMOS = 500mA
250
mΩ
Flash Duration
Register Bit [5] = 0.88
1
1.12
I_CL
Switch Current Limit(Note
9)
3.0V ≤ V_IN ≤ 4.2V
0
Flash Duration
A
Register Bit [5] = 1.35
1.5
1.65
'1'
I_{OUT_SC}
Output Short Circuit
Current Limit
V_OUT < 2.3V
200
mA
I_LED/NTC Indicator Current
Indicator Register = 0xFF, V_LEDI/NTC = 2V,
2.7V ≤ V_IN ≤ 4.2V
16
18
20
mA
Configuration Register 1 Bit [4] = '1', 3.0V
V_TRIP
Comparator Trip Threshold _{≤ VIN ≤ 4.2V}
0.97
1
1.03
V
f_SW
Switching Frequency
2.7V ≤ V_IN ≤ 5.5V
1.8
2
2.2
MHz
t_{TIMEOUT(Note Timeout Duration}
10), (Note 11)
2.7V ≤ V_IN ≤ 5.5V
-10
+10
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