LM3553 Datasheet, PDF (4/26 Pages) National Semiconductor (TI) – 1.2A Dual Flash LED Driver System with I2C Compatible

LM3553
SNVS414B – FEBRUARY 2008 – REVISED MAY 2013
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Electrical Characteristics
Limits in standard typeface are for T_A = +25°C. Limits in boldface type apply over the full operating junction temperature range
(-30°C ≤ T_J ≤ +125°C). Unless otherwise noted: V_IN = 3.6V, R_SET = 16.5kΩ, V_D1 = V_D2 = 500mV, VFB bit = '0', FEN = '0', TX =
'0', Flash Current Level = Full-Scale. ^(1)(2)(3)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I_LED-SUM
Flash LED Current:
I_D1+ I_D2
Flash Mode
VDX = Regulation Voltage
Flash Mode
VDX = Regulation Voltage
RSET = 13.7kΩ
930
1020
1110
mA
1200
I_LED-IND
VM_REG
Indicator Current Level
Output Voltage Regulation in
Voltage Mode
Indicator Mode
VM = '1', EN1 = EN0 = '0'
No Load
20
mA
4.65
4.98
5.30
V
I_Q
Quiescent Supply Current
V_D1,D2 = 0V
(Switching)
1.0
1.2
mA
I_SD
I_Dx / I_SET
Shutdown Supply Current
LED Current to Set Current
Ratio
Device Disabled
I_Dx= 500mA
3.8
6.0
µA
6770
A/A
V_SET
V_D1,D2
I_SET Pin Voltage
Current Sink Regulation
Voltage
VFB Bit = '0'
VFB Bit = '1'
1.24
V
450
mV
350
I_Dx-MATCH
R_DSON
I_CL
Current Sink Matching
NMOS Switch Resistance
NMOS Switch Current Limit
VDX = Regulation Voltage
OCL Bit = '0'
OCL Bit = '1'
2
%
0.25
Ω
2.2
2.5
2.8
A
1.53
1.70
1.87
I_L-SW
SW Pin Leakage Current
Switch Off, V_SW=3.6V, OVP
Mode = '0'
10
nA
I_L-Dx
V_OVP
D1, D2 Pin Leakage
Output Over-Voltage
Protection Trip Point
VDx = 3.5V
OVP Mode = '1'
OVP Mode = '0'
10
nA
18.00
18.90
19.65
V
5.4
5.6
5.85
OVP_Hyst
Over-Voltage Protection
Hysteresis
OVP to Normal Operation
OVP Mode = '1'
OVP Mode = '0'
1.6
V
0.6
I_L-OVP
f_SW
t_FD-MIN
D_MAX
D_MIN
Th_TX,F-EN
OVP Pin Leakage Current
Switching Frequency
Minimum Flash Duration Step
Maximum Duty Cycle
Minimum Duty Cycle
TX, F_EN Pin Threshold
V_OVP=3.6V
t_FD-MIN = 16 ÷ f_SW
On
Off
10
nA
1.0
1.2
1.35
MHz
12.8
µsec.
92
%
6
%
1.0
VIN
V
0
0.6
Multi-Function Pin (M/F) Voltage Specifications
V_M/F
Multi-Function Pin Threshold
Voltages
Input Logic High "1"
Input Logic Low "0"
0.94
0
VIN
V
0.64
V_OL
Output Logic Low "0"
I_LOAD = 4.2mA,
GPIO Mode
I²C Compatible Voltage Specifications (SCL, SDIO, VIO)
400
mV
VIO
Serial Bus Voltage Level
1.45
VIN
V
V_IL
Input Logic Low "0"
V_IH
Input Logic High "1"
V_OL
Output Logic Low "0"
VIO = 3.0V
VIO = 3.0V
I_LOAD = 3.7mA
0
0.55 × VIO
0.38 ×VIO
V
VIO
V
400
mV
(1) All voltages are with respect to the potential at the GND pin.
(2) Min and Max limits are specified by design, test, or statistical analysis. Typical (Typ) numbers represent the most likely norm. Unless
otherwise specified, conditions for Typ specifications are: V_IN = 3.6V and T_A = 25ºC.
(3) All testing for the LM3553 is done open-loop.
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