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LM3642 Datasheet(PDF) 5 Page - Texas Instruments

Part # LM3642
Description  Synchronous Boost LED Flash Driver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3642 Datasheet(HTML) 5 Page - Texas Instruments

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LM3642
www.ti.com
SNVS891H – SEPTEMBER 2012 – REVISED SEPTEMBER 2015
6.5 Electrical Characteristics
MIN and MAX limits apply over the full operating ambient temperature range (
−40°C ≤ TA ≤ 85°C). Unless otherwise
specified, TA = 25°C, VIN = 3.6 V.
(1) (2)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CURRENT SOURCE SPECIFICATIONS
1-A flash, VOUT = 4 V
–6%
1.04
6%
A
1.5-A flash, VOUT = 4 V
–8%
1.5
8%
A
ILED
Current source accuracy
24-mA torch, VOUT = 4 V
–10%
24
10%
mA
(LM3642-LT)
48.4 mA Torch, VOUT = 4 V
–10%
48.4
10%
mA
ILED = 1.5 A
Flash
275
12%
Current source regulation
VHR
mV
voltage
ILED = 24 mA/48.4 mA
Torch
150
15%
ON threshold
–2.8%
5
2.2%
Output overvoltage protection
VOVP
V
trip point
OFF threshold
–2.7%
4.88
2.3%
STEP-UP DC-DC CONVERTER SPECIFICATIONS
RPMOS
PMOS switch on-resistance
IPMOS = 1 A
120
m
RNMOS
NMOS switch on-resistance
INMOS = 1 A
90
–17%
1.6
15%
ICL
Input current limit
A
–17%
1.88
15%
Input voltage flash monitor trip
VIVFM
–3.2%
2.9
3.2%
V
threshold
UVLO
Undervoltage threhold
Falling VIN
–4%
2.8
4%
V
ƒSW
Switching frequency
–9%
4
9%
MHz
IQ
Quiescent supply current
Device not switching pass mode
0.75
mA
ISB
Standby supply current
Device disabled 2.5 V
≤ VIN ≤ 5.5 V
1.6
4
µA
Flash-to-torch LED current
TX low to high
tTX
4
µs
settling time
ILED = 1.5 A to 24 mA/48.4 mA
STROBE, TX VOLTAGE SPECIFICATIONS
VIL
Input logic low
2.5 V
≤ VIN ≤ 5.5 V
0
0.4
V
VIH
Input logic high
2.5 V
≤ VIN ≤ 5.5 V
1.2
VIN
I2C-COMPATIBLE INTERFACE SPECIFICATIONS (SCL, SDA)
VIL
Input logic low
2.5 V
≤ VIN ≤ 5.5 V
0
0.4
V
VIH
Input logic high
2.5 V
≤ VIN ≤ 4.2 V
1.2
VIN
VOL
Output logic low
ILOAD = 3 mA
400
mV
(1)
All voltages are with respect to the potential at the GND pin.
(2)
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.
Copyright © 2012–2015, Texas Instruments Incorporated
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