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LM3639A Folha de dados(PDF) 4 Page - Texas Instruments

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Nome de Peças LM3639A
Descrição Electrónicos  Single Chip 40V Backlight 1.5A Flash LED Driver
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
Logo TI - Texas Instruments

LM3639A Folha de dados(HTML) 4 Page - Texas Instruments

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LM3639A
SNVS964 – MARCH 2013
www.ti.com
ELECTRICAL CHARACTERISTICS
(1) (2)
Limits in standard typeface are for TA = +25°C. Limits in boldface type apply over the full operating ambient temperature
range (
−40°C ≤ TA ≤ +85°C). Unless otherwise specified, VIN = 3.6V.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
VIN
Input Voltage Range
2.5
3.6
5.5
V
ISHDN
Shutdown Supply Current
Device Shutdown, EN = GND
1
3.5
µA
Device Disabled via I2C
ISB
Standby Supply Current
1
4
EN = VIN
Low Voltage Boost Specifications (Flash Driver)
750 mA Flash
−7%
1.5
+7%
A
Current Setting
28.125 mA Torch
IFLED1 + IFLED2
Current Source Accuracy
2.7V
≤ VIN ≤ 5.5V
Current Setting,
−10%
56.25
+10%
mA
per current
source
For 750 mA Flash Current Setting
315
VHR1, VHR2
Regulated Headroom Voltage
mV
For 28.125 mA Torch Current Setting
180
ON Threshold
4.87
5
5.10
Output Over-Voltage
VOVP
V
Protection Trip Point
OFF Threshold
4.71
4.88
4.98
RPMOS
PMOS Switch On-Resistance
IPMOS = 1A
85
m
RNMOS
NMOS Switch On-Resistance
INMOS = 1A
75
−12%
1.7
12%
−12%
1.9
12%
ICL
Switch Current Limit
VIN = 3.6V
A
−12%
2.5
12%
−12%
3.1
12%
Input Voltage Monitor
VIVM
VIN Falling
−4%
2.5
4%
V
Threshold
fSW
Switching Frequency
2.5V
≤ VIN ≤ 5.5V
3.64
4.00
4.36
MHz
Device Not Switching
IQ
Quiescent Supply Current
0.6
2
mA
Pass Mode, Backlight Disabled
Flash to Torch LED Current
TX low to High, ILED1,2 = 750 mA to
tTX
4
µs
Settling Time
23.44 mA
High Voltage Boost Specification (Backlight Driver)
Output Current Regulation
2.7V
≤ VIN ≤ 5.5V, Full Scale Current =
IBLED1, IBLED2
−7%
19
7%
mA
(BLED1 or BLED2)
19 mA, Brightness Register = 0xFF
BLED1 to BLED2 Current
2.7V
≤ VIN ≤ 5.5V, Full Scale Current =
IMATCH_HV
1
2.25
%
Matching(3)
19 mA, Brightness Register = 0xFF
Regulated Current Sink
VREG_CS
ILED = 19mA
400
Headroom Voltage
mV
Current Sink Minimum
VHR_MIN
ILED = 95% of ILED = 19 mA
130
Headroom Voltage
RDSON
NMOS Switch On Resistance
ISW = 500 mA
230
m
ICL_BOOST
NMOS Switch Current Limit
VIN = 3.6V
−10%
1
10%
A
ON Threshold, 2.7V
≤ VIN ≤ 5.5V,
38.4
40.0
41.4
Output Over-Voltage
OVP select bits = 11
VOVP
V
Protection
Hysteresis
1
2.5V
≤ VIN ≤ 5.5V,
fSW
Switching Frequency
Boost Frequency
465
500
535
kHz
Select Bit = '0'
DMAX
Maximum Duty Cycle
94
%
(1)
All voltages are with respect to the potential at the GND pin.
(2)
JESD ESD tests are applied at the ASIC level. The human body model is a 100 pF capacitor discharged through a 1.5 k
Ω resistor into
each pin. The machine model is a 200 pF capacitor discharged directly into each pin.
(3)
Matching (%)= 100 × (|(ILED1 - ILED2 )| / (ILED1 + ILED2))
4
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