LM3555TLE Datasheet, PDF (5/33 Pages) Texas Instruments – LM3555 Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interface

LM3555
www.ti.com
SNVS594E – JANUARY 2009 – REVISED NOVEMBER 2011
Electrical Characteristics
Limits in standard typeface are for T_A = +25°C. Limits in boldface type apply over the full operating ambient temperature
range (−30°C ≤ T_A ≤ +85°C). Unless otherwise specified: V_IN = 3.6V.^{(1) (2)}
Symbol
Parameter
Conditions
Min
Typ
Max
Units
CURRENT AND VOLTAGE SPECIFICATIONS
50.7
(-15.5%)
60
67.2
(+12%)
I_LED-OUT Flash LED Accuracy
2.7V ≤ V_IN ≤ 5.5V
V_OUT = 6.5V,
V_LED = 6.2V
69.8
(-12.8%)
80
86.4
(+8.0%)
mA
304
(-5%)
320
336
(+5%)
(%)
475
(-5%)
500
535
(+7%)
(-20.4%) 2.5 mA (+33.6%)
I_IND-OUT
Indicator LED Current
Accuracy
2.7V ≤ V_IN ≤ 5.5V
V_IND = 2.0V (Indicator Mode)
(-20.4%) 5.0mA (+33.8%)
%
(-20.3%) 7.5mA (+33.7%)
(-20.2%) 10.0mA (+33.4%)
V_CSH
Current Source
Headroom Voltage
2.7V ≤ V_IN ≤ 5.5V
300
350
mV
V_OVP
Over-Voltage Protection
Range
2.7V ≤ V_IN ≤ 5.5V
Trip Point (Rising)
9.22
9.5
9.96
V
Hysteresis
0.4
V_OUT
Output Voltage Range (V_LED x N_LED) + V_CSH
Upper Range
Lower Range
8.5
V
2.8
I_SD
Shutdown Current
2.7V ≤ V_IN ≤ 5.5V
I_SB
Standby Current
2.7V ≤ V_IN ≤ 5.5V
I_Q
Operating Quiescent
Current
2.7V ≤ V_IN ≤ 5.5V
Part Switching
0.75
µA
1.1
4.3
µA
3.5
mA
V_REF
Reference Voltage for
LED Detection
V_IN = 3.6V (No Offset)
4.35
V
V_IND
IND OVP
Indicator Fault Voltages
IND Short
2.571
V
0.842
UVLO
Under-Voltage Lock Out Falling V_IN
UVLO_HYST UVLO Hysteresis
Rising V_IN
2.35
2.4
2.43
V
60
70
85
mV
Current Limit Register
value = 00
1.183
1.250
1.550
I_LIM
Peak Current Limit
2.7V ≤ V_IN ≤ 5.5V
(3)
Current Limit Register
value = 01
1.417
1.500
1.781
A
Current Limit Register
value = 10
1.512
1.750
2.025
Current Limit Register
value = 11
OSCILLATOR AND TIMING SPECIFICATIONS (NON-I²C INTERFACE TIMING)
1.805
2.000
2.267
f_SW
Switching Frequency
2.7V ≤ V_IN ≤ 5.5V
1.91
(−4.5%)
2.0
2.15
(+7.5%)
MHz
t_HW
t_RU
t_RD
t_TORCH-DG
Hardware Flash Timeout
Current Ramp-Up Time
Current Ramp Down
Time
Torch Deglitching Time
Default Timer
I_LED = 0mA to I_LED = Fullscale,
V_OUT = 6.5V, V_LED = 6.2V
I_LED = Fullscale to I_LED = 0 mA
V_OUT = 6.5V, V_LED = 6.2V
850
msec
0.6
1.0
msec
0.2
0.5
msec
6.3
9
11.7
msec
(1) Min and Max limits are guaranteed by design, test, or statistical analysis. Typical (Typ) numbers are not guaranteed, but do represent
the most likely norm. Unless otherwise specified, conditions for Typical specifications are: V_IN = 3.6V and T_A = 25°C.
(2) Switching disabled.
(3) T_A (min) = 0°C to account for self-heating. Current Limit specification uses V_IN (Max) = 4.0V to account for the input voltage range where
current limit could be reached based upon the maximum application specifications for output voltage and diode current. Operation above
4.0V and up to 5.5V is allowed and should not reach current limit.
Copyright © 2009–2011, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Links: LM3555