Short Circuit Duration ............................. Indefinite
Lead Temperature (Soldering, 10 sec)................... 300°C
Operating Junction Temperature Range (Notes 3, 4)
(E-Grade/I-Grade) .................................. –40 to 125°C
(H-Grade) ............................................... –40 to 150°C
(MP-Grade) ............................................ –55 to 150°C
Storage Temperature Range ......................–65 to 150°C
17
MSE PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
JA
= 40°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3246EMSE#PBF
LTC3246IMSE#PBF
LTC3246HMSE#PBF
LTC3246MPMSE#PBF
TAPE AND REEL
LTC3246EMSE#TRPBF
LTC3246IMSE#TRPBF
LTC3246HMSE#TRPBF
http://www.linear.com/product/LTC3246#orderinfo
PART MARKING*
3246
3246
3246
3246
PACKAGE DESCRIPTION
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
LTC3246MPMSE#TRPBF
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult ADI Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, C
FLY
= 2.2µF, C
OUT
= 10µF, unless otherwise noted.
SYMBOL
V
IN
V
UVLO
I
VIN
V
HIGH
V
LOW
I
LOW
I
HIGH
V
OUTS_5
V
OUTS_3
V
ADJ
PARAMETER
Operating Input Voltage Range
V
IN
Undervoltage Lockout Threshold
V
IN
Quiescent Current
Shutdown
CP Enabled, Output in Regulation
SEL1, SEL2 Input Voltage
SEL1, SEL2 Input Voltage
SEL1, SEL2 Input Current
SEL1, SEL2 Input Current
VOUTS/ADJ Regulation Voltage
SEL1 = 0V, SEL2 = V
IN
VOUTS/ADJ Regulation Voltage
SEL1 = V
IN
, SEL2 = V
IN
VOUTS/ADJ Regulation Voltage
SEL1 = V
IN
, SEL2 = 0V
V
PIN
= 0V
V
PIN
= 38V
2.7V < V
IN
< 38V (Notes 5, 6)
2.7V < V
IN
< 38V (Notes 5, 6)
2.7V < V
IN
< 38V (Notes 5, 6)
SEL1 = SEL2 = 0V
SEL1 = V
IN
and/or SEL2 = V
IN
, RSTI = 5V
l
l
l
l
ELECTRICAL CHARACTERISTICS
(Note 5)
CONDITIONS
l
l
MIN
2.7
TYP
2.35
1.5
20
1.1
MAX
38
2.7
3
30
1.6
1
2
5.2
3.43
UNITS
V
V
µA
µA
V
V
µA
µA
0.4
–1
0.5
4.8
3.17
1.08
0.8
0
1
Charge Pump Operation
l
l
l
V
V
V
3246fa
1.11
1.14
2
For more information
www.linear.com/LTC3246
LTC3246
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, CFLY = 2.2µF, C
OUT
= 10µF, unless otherwise noted.
SYMBOL
I
ADJ
I
OUT_SCKT
R
OUT
V
OUT_OV_RST
V
OUT_UV_RST
V
OUT_PD
V
OUT_RIPPLE
PARAMETER
VOUTS/ADJ Input Current
SEL1 = SEL2 = V
IN
I
VOUT
Short Circuit Foldback Current
Charge Pump Output Impedance
V
OUT
= 0V
2:1 Step-Down Mode
1:1 Step-Down Mode, V
IN
= 5.5V
1:2 Step-Up Mode, V
IN
= 3V, V
OUT
≥ 3.3V (Note 6)
% of Final Regulation Voltage at Which
V
OUT
Rising Makes
RST
Go Low
V
OUT
Falling Makes
RST
Go Hi-Z
% of Final Regulation Voltage at Which
V
OUT
Rising Makes
RST
Go Hi-Z
V
OUT
Falling Makes
RST
Go Low
SEL1 = SEL2 = 0V
C
OUT
= 10µF
C
OUT
= 22µF
V
RT
= 0.3V
V
RT
= 1.3V
V
RT
= V
BIAS
V
RT
Rising
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
MIN
–50
TYP
0
250
1
1.2
4
109
108.5
97.5
95
100
50
25
MAX
+50
UNITS
nA
mA
l
l
l
l
l
8
111.5
%
%
%
%
k
mV
mV
–4.2
4.2
1
2.65
1.27
1
1
270
28
40
0.4
1
2.2
68
220
µA
µA
µA
V
V
V
µA
µA
ms
ms
µs
V
µA
s
ms
ms
ms
ms
V
V
1
1
µA
µA
ns
3246fa
V
OUT
Overvoltage Reset
V
OUT
Undervoltage Reset
V
OUT
Pull-Down in Shut Down
V
OUT
Ripple Voltage
106
93
99
Reset Timer Control Pin (RT)
I
RT(UP)
I
RT(DOWN)
I
RT(INT)
V
RT(INT)
V
RSTI_H
V
RSTI_L
I
RSTI_H
I
RSTI_L
Reset Timing
t
RST(INT)
t
RST(EXT)
t
RSTIL
V
OL(RST)
I
OH(RST)
t
WDU(INT)
t
WDL(INT)
t
WDR(EXT)
t
WDU(EXT)
t
WDL(EXT)
V
IH
V
OL
I
IH
I
IL
t
PW(WDI)
Internal Reset Timeout Period
Adjustable Reset Timeout Period
RSTI Low to
RST
Asserted
Output Voltage Low
RST
RST
Output Voltage High Leakage
Internal Watchdog Upper Boundary
Internal Watchdog Lower Boundary
External Watchdog Timeout Period
External Watchdog Upper Boundary
External Watchdog Lower Boundary
WDI Input High Voltage
WDI Input Low Voltage
WDI Input High Current
WDI Input Low Current
Input Pulsewidth
V
WDI
= 38V
V
WDI
= 0V
I
RST
= 2mA
V
RST
= 5V
V
WT
= V
BIAS
V
WT
= V
BIAS
C
WT
= 2.2nF
V
RT
= V
BIAS
C
RT
= 2.2nF
l
l
RT Pull-Up Current
RT Pull-Down Current
Internal RT Detect Current
RT Internal Timer Threshold
RSTI Input High Voltage
RSTI Input Low Voltage
RSTI Input High Current
RSTI Input Low Current
–2
2
2.0
–3.1
3.1
0.4
2.4
1.22
Reset Timer Input (RSTI)
l
l
1.04
–1
–1
150
14
5
1.2
0
0
200
21
20
0.1
RSTI = 5V
RSTI = 0V
l
l
Reset Output (RST)
l
l
–1
1.2
37.5
100
0
1.6
50
160
Watchdog Timing
l
l
l
l
l
t
WDR(EXT)
• (128/129)
t
WDR(EXT)
• (5/129)
1.1
0.4
–1
–1
400
0.8
0
0
1.6
Watchdog Timer Input (WDI)
l
l
l
l
l
For more information
www.linear.com/LTC3246
3
LTC3246
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, CFLY = 2.2µF, C
OUT
= 10µF, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
–2
2
2
TYP
MAX
–4.2
4.2
1
2.65
Watchdog Timer Control Pin (WT)
I
WT(UP)
I
WT(DOWN)
I
WT(INT)
V
WT(INT)
WT Pull-Up Current
WT Pull-Down Current
Internal WT Detect Current
WT Internal Timer Threshold
V
WT
= 0.3V
V
WT
= 1.3V
V
WT
= V
BIAS
V
WT
Rising
l
l
l
l
ELECTRICAL CHARACTERISTICS
UNITS
µA
µA
µA
V
–3.1
3.1
0.4
2.2
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All voltages are referenced to GND unless otherwise specified.
Note 3:
The LTC3246E is guaranteed to meet performance specifications
from 0°C to 85°C operating junction temperature. Specifications over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3246I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LTC3246H is guaranteed over the –40°C to 150°C
operating junction temperature range. The LTC3246MP is guaranteed and
tested over the –55°C to 150°C operating junction temperature range.
High junction temperatures degrade operating lifetimes; operating lifetime
is derated for junction temperatures greater than 125°C. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
The junction temperature (T
J
, in °C) is calculated from the ambient
temperature (T
A
, in °C) and power dissipation (P
D
, in watts) according to
the formula:
T
J
= T
A
+ (P
D
•
JA
), where
JA
(in °C/W) is the package thermal
impedance.
Note 4:
This IC has overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperatures
will exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
may impair device reliability.
Note 5:
The maximum operating junction temperature of 150°C must
be followed. Certain combinations of input voltage, output current and
ambient temperature will cause the junction temperature to exceed 150°C
and must be avoided. See Thermal Management section for information on
calculating maximum operating conditions.
Note 6:
The LTC3246 will attempt to regulate the output voltage under
all load conditions, but like any regulator, the output will drop out if
inadequate supply voltage exists for the load. See V
OUT
Regulation section
for calculating available load current at low input operating voltages. Also
see “Boost Output Impedance at Dropout vs Temperature” for typical
impedance values at output voltages less than 3.3V.
1、引言 汽车污染是当前人们最为关心和急需解决的重要课题之一。作为汽车排气污染物的检测的重要方法,简易瞬态工况法（VMAS法，IG法）可以统计排放总质量，监控车辆的真实排放情况，设备成本不高，测量比较准确，与新车认证检测结果具有相关性，可以检测NO相关因子等一系列优点，成为人们研究的热点。VMAS（Vehicle Mass Analysis System）检测方法在美国和欧洲都有很好的应用基础，...[详细]
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