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LM3646 Folha de dados(PDF) 5 Page - Texas Instruments

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Nome de Peças LM3646
Descrição Electrónicos  1.5A Synchronous Boost Converter with Dual High-Side Current Sources and I2CCompatible Interface
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM3646 Folha de dados(HTML) 5 Page - Texas Instruments

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LM3646
www.ti.com
SNVS962 – DECEMBER 2013
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
Conditions
Min
Typ
Max
Units
Current Source Specifications
ILED1/2
Current Source Accuracy
1.5A Flash, VOUT = 4V, LED1 or LED2
1.395
1.5
1.605
A
Active
(
−7%)
(+7%)
93.4 mA Torch, VOUT = 3.6V, LED1 or
84.06
93.4
102.74
mA
LED2 Active
(
−10%)
(+10%)
VOUT -
Current Source Regulation
ILED = 1.5A
Flash
250
280
mV
VLED1/2
(+12%)
ILED = 93.4 mA
Torch
150
172.5
(+15%)
Step-Up DC/DC Converter Specifications
ICL
Switch Current Limit
−15%
1.0
+15%
A
−10%
3.1
+10%
VOVP
Output Over-Voltage Protection Trip Point
ON Threshold
4.85
5.0
5.15
V
OFF Threshold
4.65
4.8
4.95
RPMOS
RPMOS Switch On-Resistance
IPMOS = 1A
85
m
RNMOS
NMOS Switch On-Resistance
INMOS = 1A
65
UVLO
Under Voltage Lockout Threshold
Falling VIN
2.74
2.8
2.85
V
VNTC-Trip
NTC Comparator Trip Threshold
−6%
600
+6%
mV
INTC
NTC Current
−6%
50
+6%
µA
VNTC-Open
NTC Open Trip Threshold
2.2
2.3
2.4
V
VNTC-Short
NTC Short Trip Threshold
75
100
125
mV
VIVFM
Input Voltage Flash Monitor Trip Threshold
−5%
2.9
+5%
V
fSW
Switching Frequency
2.8V
≤ VIN ≤ 4.8V
3.72
4
4.28
MHz
ISD
Shutdown Supply Current
Device Disabled, EN = 0V
0.1
1.3
µA
2.8V
≤ VIN ≤ 4.8V
ISB
Standby Supply Current
Device Disabled, EN = 1.8V
2.5
10
µA
2.8V
≤ VIN ≤ 4.8V
ENABLE, STROBE, TORCH, TX Voltage Specifications
VIL
Input Logic Low
2.8V
≤ VIN ≤ 4.2V
0
0.4
V
VIH
Input Logic High
1.2
VIN
I2C-Compatible Interface Specifications (SCL, SDA)
VIL
Input Logic Low
2.8V
≤ VIN ≤ 4.2V
0
0.4
V
VIH
Input Logic High
1.2
VIN
VOL
Output Logic Low
ILOAD = 1.5 mA
300
mV
tSCL
SCL Clock Period
1
µs
(1)
All voltages are with respect to the potential at the GND pin.
(2)
Min and Max limits are 100% production tested at an ambient temperature (TA) of 25 °C. Limits over the operating temperature range
are specified through correlation using Statistical Quality Control (SQC) methods. Unless otherwise specified, conditions for typical
specifications are: VIN = 3.6V and TA = +25°C.
Copyright © 2013, Texas Instruments Incorporated
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