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LM3643A Arkusz danych(PDF) 5 Page - Texas Instruments

Numer części LM3643A
Szczegółowy opis  Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

LM3643A Arkusz danych(HTML) 5 Page - Texas Instruments

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LM3643, LM3643A
www.ti.com
SNVS967A – AUGUST 2014 – REVISED NOVEMBER 2014
8.5 Electrical Characteristics
Typical limits tested at TA = 25°C. Minimum and maximum limits apply over the full operating ambient temperature range
(
−40°C ≤ TA ≤ 85°C). Unless otherwise specified, VIN = 3.6 V, HWEN = VIN.
(1) (2)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CURRENT SOURCE SPECIFICATIONS
VOUT = 4 V, flash code = 0x7F = 1.5 A
–7%
1.5
7%
A
flash
ILED1/2
Current source accuracy
VOUT = 4 V, torch code = 0x3F = 89.3 mA
–10%
89.3
10%
mA
torch
ILED1/2 = 729 mA
Flash
290
LED1 and LED2 current source
VHR
mV
regulation voltage
ILED1/2 = 179 mA
Torch
158
ON threshold
4.86
5
5.1
VOVP
V
OFF threshold
4.75
4.88
4.99
STEP-UP DC/DC CONVERTER SPECIFICATIONS
RPMOS
PMOS switch on-resistance
86
m
RNMOS
NMOS switch on-resistance
65
Reg 0x07, bit[0] = 0
–12%
1.9
12%
ICL
Switch current limit
A
Reg 0x07, bit[0] = 1
–12%
2.8
12%
UVLO
Undervoltage lockout threshold
Falling VIN
–2%
2.5
2%
V
VTRIP
NTC comparator trip threshold
Reg 0x09, bits[3:1] = '100'
–5%
0.6
5%
V
INTC
NTC current
–6%
50
6%
µA
Input voltage flash monitor trip
VIVFM
Reg 0x02, bits[5:3] = '000'
–3%
2.9
3%
V
threshold
IQ
Quiescent supply current
Device not switching pass mode
0.3
0.75
mA
Device disabled, HWEN = 0 V
ISD
Shutdown supply current
0.1
4
µA
2.5 V
≤ VIN ≤ 5.5 V
Device disabled, HWEN = 1.8 V
ISB
Standby supply current
2.5
10
µA
2.5 V
≤ VIN ≤ 5.5 V
HWEN, TORCH/TEMP, STROBE, TX VOLTAGE SPECIFICATIONS
VIL
Input logic low
0
0.4
2.5 V
≤ VIN ≤ 5.5 V
V
VIH
Input logic high
1.2
VIN
I2C-COMPATIBLE INTERFACE SPECIFICATIONS (SCL, SDA)
VIL
Input logic low
0
0.4
2.5 V
≤ VIN ≤ 4.2 V
V
VIH
Input logic high
1.2
VIN
VOL
Output logic low
ILOAD = 3 mA
400
mV
(1)
Minimum (Min) and Maximum (Max) limits are specified by design, test, or statistical analysis. Typical (typ.) numbers are not verified, but
do represent the most likely norm. Unless otherwise specified, conditions for typical specifications are: VIN = 3.6 V and TA = 25°C.
(2)
All voltages are with respect to the potential at the GND pin.
8.6 Timing Requirements
MIN
NOM
MAX
UNIT
t1
SCL clock period
2.4
µs
t2
Data in set-up time to SCL high
100
t3
Data out stable After SCL low
0
ns
t4
SDA low set-up time to SCL Low (start)
100
t5
SDA high hold time after SCL high (stop)
100
8.7 Switching Characteristics
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ƒSW
Switching frequency
2.5 V
≤ VIN ≤ 5.5 V
–6%
4
6%
MHz
Copyright © 2014, Texas Instruments Incorporated
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