LTC3220E/LTC3220E-1 ........................ –40°C to 85°C
LTC3220I/LTC3220I-1 ........................ –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
28 27 26 25 24 23 22
ULED1 1
ULED2 2
ULED3 3
ULED4 4
ULED5 5
ULED6 6
ULED7 7
PF PACKAGE
28-LEAD UTQFN (4mm
4mm)
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3220EPF#PBF
LTC3220EPF-1#PBF
LTC3220IPF#PBF
LTC3220IPF-1#PBF
TAPE AND REEL
LTC3220EPF#TRPBF
LTC3220EPF-1#TRPBF
LTC3220IPF#TRPBF
LTC3220IPF-1#TRPBF
PART MARKING*
3220T
2201T
3220T
2201T
PACKAGE DESCRIPTION
28-Lead UTQFN (4mm
×
4mm)
28-Lead UTQFN (4mm
×
4mm)
28-Lead UTQFN (4mm
×
4mm)
28-Lead UTQFN (4mm
×
4mm)
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard 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 full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, DV
CC
= 3V,
RST
= high, C1 = C2 = C3 = 2.2μF C4 = 4.7μF
,
,
unless otherwise noted.
SYMBOL
PARAMETER
V
IN
Operating Voltage
I
VIN
Operating Current
CONDITIONS
l
ELECTRICAL CHARACTERISTICS
MIN
2.9
TYP
580
2.4
3.2
1
MAX
5.5
I
CPO
= 0, 1x Mode
I
CPO
= 0, 1.5x Mode
I
CPO
= 0, 2x Mode
l
DV
CC
UVLO Threshold
DV
CC
Operating Voltage
V
IN
UVLO Threshold
1.5
1.5
5.5
UNITS
V
μA
mA
mA
V
V
V
32201fc
2
LTC3220/LTC3220-1
The
l
denotes the specifications which apply over the full operating
,
,
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, DV
CC
= 3V,
RST
= high, C1 = C2 = C3 = 2.2μF C4 = 4.7μF
unless otherwise noted.
SYMBOL
PARAMETER
V
IN
Shutdown Current
DV
CC
Shutdown Current
Universal LED Current, 6-Bit Linear DACs, ULED = 1V
Full-Scale LED Current
Minimum (I
LSB
) LED Current Step
Minimum Programmable Current
LED Current Matching
LED Dropout Voltage
Blink Rate Period
ULED Up/Down Gradation Ramp Times
CONDITIONS
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
3.2
MAX
7
1
22
UNITS
μA
μA
mA
mA
mA
%
mV
Sec
Sec
Sec
Sec
Sec
Sec
Sec
Sec
mV
μs
Ω
Ω
Ω
V
V
MHz
V
mA
V
V
μA
μA
V
ns
kHz
μs
μs
μs
μs
18
Gradation Period
V
OL
General Purpose Output Mode (GPO)
LED Turn-On Delay
Charge Pump (CPO)
1x Mode Output Impedance
1.5x Mode Output Impedance
2x Mode Output Impedance
CPO Regulation Voltage
Clock Frequency
CPO Short-Circuit Detection
Threshold Voltage
Test Current
SDA, SCL,
RST
V
IL
V
IH
I
IH
I
IL
Digital Output Low (SDA)
V
OL
RST
Timing
Reset Pulse Duration
Serial Port Timing (Notes 6, 7)
Clock Operating Frequency
f
SCL
Bus Free Time Between Stop and Start
t
BUF
Condition
Hold Time After (Repeated) Start Condition
t
HD,STA
Repeated Start Condition Setup Time
t
SU,STA
Stop Condition Setup Time
t
SU,STO
ULED Data Register Programmed to
0b00000001
Any Two Outputs, 50% of FS
I
LED
= FS
REG19, D4 = 0
REG19, D4 = 1
REG19, D1 = 1, D2 = 0
REG19, D1 = 0, D2 = 1
REG19, D1 = 1, D2 = 1
REG19, D1 = 1, D2 = 0
REG19, D1 = 0, D2 = 1
REG19, D1 = 1, D2 = 1
I
OUT
= 1mA, Single Output Enabled
From Stop Bit, Part Enabled
20
0.314
0.395
1.5
120
1.25
2.5
0.24
0.48
0.96
0.313
0.625
1.25
5
4
0.6
3.6
4.1
4.5
5.03
0.85
0.410
0.820
1.640
V
IN
= 3V, V
CPO
= 4.2V (Note 5)
V
IN
= 3V, V
CPO
= 4.8V (Note 5)
1.5x Mode, I
CPO
= 20mA
2x Mode, I
CPO
= 20mA
l
l
0.65
0.4
10
1.05
1.3
30
0.3 • DV
CC
1
1
0.4
CPO = 0V
l
l
l
SDA, SCL,
RST
= DV
CC
SDA, SCL,
RST
= 0V
I
PULLUP
= 3mA
0.7 • DV
CC
l
–1
l
–1
l
0.12
20
400
1.3
0.6
0.6
0.6
32201fc
3
LTC3220/LTC3220-1
The
l
denotes the specifications which apply over the full operating
,
,
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V, DV
CC
= 3V,
RST
= high, C1 = C2 = C3 = 2.2μF C4 = 4.7μF
unless otherwise noted.
SYMBOL
t
HD,DAT(OUT)
t
HD,DAT(IN)
t
SU,DAT
t
LOW
t
HIGH
t
f
t
r
t
SP
PARAMETER
Data Hold Time
Input Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Clock Data Fall Time
Clock Data Rise Time
Spike Supression Time
CONDITIONS
MIN
0
0
100
1.3
0.6
20
20
TYP
MAX
900
UNITS
ns
ns
ns
μs
μs
ns
ns
ns
ELECTRICAL CHARACTERISTICS
300
300
50
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:
Based on long term current density limitations.
Note 3:
The LTC3220E/LTC3220E-1 are guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3220I/LTC3220I-1
are guaranteed to meet performance specifications over the full –40°C to
125°C operating temperature range.
Note 4:
These devices include overtemperature protection that is intended
to protect the devices during momentary overload conditions. Junction
temperatures will exceed 125°C when overtemperature protection is
active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
我最近在《华尔街日报》看到一篇题为“我们需要能维修自己的电子小玩意儿的权利(We need the right to repair our gadgets)”的文章(参考原文：)，作者对于众多电子产品看来是“有计画的废弃(planned obsolescence)”之现象非常愤怒，认为大众应该要求电子产品可以被维修。 但实际的情况是，举例来说，家家都有的电视机如果故障了，修理费用可能...[详细]
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