LM3555TLE Datasheet, PDF (6/33 Pages) Texas Instruments – LM3555 Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interface

LM3555
SNVS594E – JANUARY 2009 – REVISED NOVEMBER 2011
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Electrical Characteristics (continued)
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
CONTROL INTERFACE VOLTAGE SPECIFICATIONS
V_I2C/EN
I²C/EN Pin Voltage
Threshold
2.7V ≤ V_IN ≤ 5.5V
Simple Mode
I²C Mode
1.26
0.54
V
Low-Level Threshold
V_IL
Voltage (SCL/EN1 and 2.7V ≤ V_IN ≤ 5.5V
SDA/EN2)
0.54
V
High-Level Threshold
V_IH
Voltage (SCL/EN1 and 2.7V ≤ V_IN ≤ 5.5V
SDA/EN2)
1.26
V
Low-Level Output
V_OL
Threshold Limit
(SDA/EN2)
I_LOAD = 3mA
0.4
V
CONTROL INTERFACE TIMING SPECIFICATIONS
T_I2C-Start I²C Logic Startup Time I²C/EN going high
f_SCL
SCL Clock Frequency
t_I2C
I²C Hang-Up Tie
t_LOW
Low Period of SCL Clock
t_HIGH
High Period of SCL Clock
t_HD-STA
Hold Time (repeated)
START Condition
250
500
µsec
400
kHz
35
msec
1.3
µsec
0.6
µsec
0.6
µsec
t_SU-STA
Setup time for a repeated
START condition
0.6
µsec
t_HD-DAT
t_SU-DAT
t_R
Data Hold Time
Data Setup Time
Rise Time for SCL and
SDA
0
µsec
100
nsec
300
nsec
t_F
Fall Time for SCL and
SDA
300
nsec
t_SU-STO
Setup Time for Stop
Condition
0.6
µsec
t_BUF
Bus Free Time between
Stop and Start Condition
1.3
µsec
t_VD-DAT
t_VD-ACK
Data Valid Time
Data Valid Acknowledge
Time
0.9
µsec
0.9
µsec
C_B
Capacitive Load for Each
Bus Line
20+0.1xC
B
400
pF
6
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