Features
LTC6255/LTC6256/LTC6257
6.5MHz, 65µA Power
Efficient Rail-to-Rail I/O
Op Amps
Description
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The LTC®6255/LTC6256/LTC6257 are single/dual/quad
operational amplifiers with low noise, low power, low
supply voltage, and rail-to-rail inputs and outputs. They
are unity gain stable with or without capacitive loads.
They feature 6.5MHz gain-bandwidth product, 1.8V/µs
slew rate while consuming only 65µA of supply current
per amplifier operating on supply voltages ranging from
1.8V to 5.25V. The combination of low supply current,
low supply voltage, high gain bandwidth product and low
noise makes the LTC6255 family unique among rail-to-rail
input/output op amps with similar supply current. These
operational amplifiers are ideal for low power and low
noise applications.
Gain Bandwidth Product: 6.5MHz
–3dB Bandwidth (AV = +1): 4.5MHz
Low Quiescent Current: 65µA
C-Load™ Op Amp Drives all Capacitive Loads
Offset Voltage: 350µV Maximum
Rail-to-Rail Input and Output
Supply Voltage Range: 1.8V to 5.25V
Input Bias Current: 50nA Maximum
CMRR/PSRR: 100dB/100dB
Shutdown Current: 7µA Maximum
Operating Temperature Range: –40°C to 125°C
Single in 6-Lead TSOT-23, 2mm × 2mm DFN Packages
Dual in 8-Lead MS8, MS10, TS0T-23, 2mm × 2mm
DFN, 2mm × 2mm Thin DFN Packages
n Quad in MS16 Package
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For applications that require power-down, the LTC6255
and LTC6256 in S6 and MS10 packages offer shutdown
which reduces the current consumption to 7µA maximum.
Applications
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The LTC6255 family can be used as plug-in replacements
for many commercially available op amps to reduce power
and improve input/output range and performance.
Micropower Active Filters
Portable Instrumentation
Battery or Solar Powered Systems
Automotive Electronics
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Over-The-Top and C-Load are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Typical Application
LTC6255 Driving LTC2361 ADC
Low Power, Low Distortion ADC Driver
0
3.3V
–20
+
LTC6255
–
324Ω
1%
470pF
NPO
VDD
AIN
VREF
LTC2361
GND
–30
CS
SDO
SCK
OVDD
MAGNITUDE (dB)
3.3V
VIN
5mV TO 2V
VIN = –1dBFS, 5kHz
fS = 125kSps
SNR = 72.5dB
SFDR = 89dB
tACQ = 5µs
tCONV = 3µs
–10
–40
–50
–60
–70
–80
10k
1%
625567 TA01a
6.34k, 1%
–90
–100
22pF
ISUPPLY = 540µA TOTAL AT 125kSps
–110
0
10
20
30
40
FREQUENCY (kHz)
50
60
625567 TA01b
625567fd
For more information www.linear.com/LTC6255
1
LTC6255/LTC6256/LTC6257
Absolute Maximum Ratings
(Note 1)
Supply Voltage: V+ – V–............................................5.5V
Input Voltage ................................... V– – 0.2 to V+ + 0.2
Input Current: +IN, –IN, SHDN (Note 2)...............±10mA
Output Current: OUT............................................ ±20mA
Output Short-Circuit Duration (Note 3)............ Indefinite
Operating Temperature Range (Note 4)
LTC6255C/LTC6256C/LTC6257C.........–40°C to 85°C
LTC6255I/LTC6256I/LTC6257I............–40°C to 85°C
LTC6255H/LTC6256H/LTC6257H......–40°C to 125°C
Specified Temperature Range (Note 5)
LTC6255C/LTC6256C/LTC6257C............. 0°C to 70°C
LTC6255I/LTC6256I/LTC6257I............–40°C to 85°C
LTC6255H/LTC6256H/LTC6257H......–40°C to 125°C
Maximum Junction Temperature.......................... 150°C
Storage Temperature Range...................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
S6, TS8, MS8, MS only.........................................300°C
Pin Configuration
TOP VIEW
2
+INA
3
V–
4
–
+
9
V–
V+
7
OUTB
6
–INB
V– 2
5
+INB
+IN 3
6 V+
OUT 1
4 –IN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 150°C, qJA = 192°C/W (NOTE 6)
KC PACKAGE
8-LEAD (2mm × 2mm × 0.6mm) PLASTIC UTDFN
TJMAX = 125°C, qJA = 89°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS V–, MUST BE SOLDERED TO PCB
TOP VIEW
1
2
3
4
8
7
6
5
–
+
+
–
OUTA
–INA
+INA
V–
5 SHDN
+
–
–INA
TOP VIEW
8
TOP VIEW
V+
OUTB
–INB
+INB
OUTA
–INA
+INA
V–
1
2
3
4
–
+
8
7
6
5
+
–
1
+
–
OUTA
V+
OUTB
–INB
+INB
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, qJA = 163°C/W (NOTE 6)
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
TJMAX = 150°C, qJA = 195°C/W (NOTE 6)
TOP VIEW
1
2
3
4
5
–
+
+
–
OUTA
–INA
+INA
V–
SHDNA
10
9
8
7
6
OUTA
–INA
+INA
V+
+INB
–INB
OUTB
NC
V+
OUTB
–INB
+INB
SHDNB
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, qJA = 160°C/W (NOTE 6)
1
2
3
4
5
6
7
8
–INA 2
+INA 3
V– 4
V+ 1
7 OUTB
+IN 2
6 –INB
V– 3
5 +INB
DC PACKAGE
8-LEAD (2mm × 2mm × 0.8mm) PLASTIC DFN
TJMAX = 125°C, qJA = 102°C/W (NOTE 6)
EXPOSED PAD (PIN 9) IS V–, MUST BE SOLDERED TO PCB
2
+
–
OUTD
–IND
+IND
V–
+INC
–INC
OUTC
NC
TOP VIEW
8 V+
9
V–
+
–
16
15
14
13
12
11
10
9
MS PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 150°C, qJA = 125°C/W (NOTE 6)
TOP VIEW
OUTA 1
–
+
+
–
TOP VIEW
6 OUT
7
V–
5 –IN
4 SHDN
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, qJA = 102°C/W (NOTE 6)
EXPOSED PAD (PIN 7) IS V–, MUST BE SOLDERED TO PCB
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Order Information
Lead Free Finish
TAPE AND REEL (MINI)
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC6255CS6#TRMPBF
LTC6255CS6#TRPBF
LTFFT
6-Lead Plastic TSOT-23
0°C to 70°C
LTC6255IS6#TRMPBF
LTC6255IS6#TRPBF
LTFFT
6-Lead Plastic TSOT-23
–40°C to 85°C
LTC6255HS6#TRMPBF
LTC6255HS6#TRPBF
LTFFT
6-Lead Plastic TSOT-23
–40°C to 125°C
LTC6255CDC#TRMPBF
LTC6255CDC#TRPBF
LFFV
6-Lead (2mm × 2mm × 0.8mm) Plastic DFN
0°C to 70°C
LTC6255IDC#TRMPBF
LTC6255IDC#TRPBF
LFFV
6-Lead (2mm × 2mm × 0.8mm) Plastic DFN
–40°C to 85°C
LTC6256CTS8#TRMPBF
LTC6256CTS8#TRPBF
LTFFW
8-Lead Plastic TSOT-23
0°C to 70°C
LTC6256ITS8#TRMPBF
LTC6256ITS8#TRPBF
LTFFW
8-Lead Plastic TSOT-23
–40°C to 85°C
LTC6256HTS8#TRMPBF
LTC6256HTS8#TRPBF
LTFFW
8-Lead Plastic TSOT-23
–40°C to 125°C
LTC6256CKC#TRMPBF
LTC6256CKC#TRPBF
DXYT
8-Lead (2mm × 2mm × 0.6mm) Plastic UTDFN
0°C to 70°C
LTC6256IKC#TRMPBF
LTC6256IKC#TRPBF
DXYT
8-Lead (2mm × 2mm × 0.6mm) Plastic UTDFN
–40°C to 85°C
LTC6256CDC#TRMPBF
LTC6256CDC#TRPBF
LGVP
8-Lead (2mm × 2mm × 0.8mm) Plastic DFN
0°C to 70°C
LTC6256IDC#TRMPBF
LTC6256IDC#TRPBF
LGVP
8-Lead (2mm × 2mm × 0.8mm) Plastic DFN
–40°C to 85°C
LTC6256CMS8#PBF
LTC6256CMS8#TRPBF
LTDXW
8-Lead Plastic MSOP
0°C to 70°C
LTC6256IMS8#PBF
LTC6256IMS8#TRPBF
LTDXW
8-Lead Plastic MSOP
–40°C to 85°C
LTC6256CMS#PBF
LTC6256CMS#TRPBF
LTDXX
10-Lead Plastic MSOP
0°C to 70°C
LTC6256IMS#PBF
LTC6256IMS#TRPBF
LTDXX
10-Lead Plastic MSOP
–40°C to 85°C
LTC6257CMS#PBF
LTC6257CMS#TRPBF
6257
16-Lead Plastic MSOP
0°C to 70°C
LTC6257IMS#PBF
LTC6257IMS#TRPBF
6257
16-Lead Plastic MSOP
–40°C to 85°C
LTC6257HMS#PBF
LTC6257HMS#TRPBF
6257
16-Lead Plastic MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
–40°C to 125°C
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
5V Electrical Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 5V, VCM = VOUT = VSUPPLY/2, CL = 10pF, VSHDN is unconnected.
SYMBOL PARAMETER
VOS
Input Offset Voltage
CONDITIONS
VCM
MIN
TYP
MAX
UNITS
–350
–700
100
l
350
700
µV
µV
–350
–700
100
l
350
700
µV
µV
= V– + 0.3V (PNP Region)
VCM = V+ – 0.3V (NPN Region)
VOS TC
IB
Input Offset Voltage Drift
Input Bias Current (Note 7)
VCM = V– + 0.3V, V+ – 0.3V
VCM
Input Offset Current
–50
–75
–5
50
75
nA
nA
–50
–75
5
l
50
75
nA
nA
–20
–35
2
l
20
35
nA
nA
–20
–35
2
l
20
35
nA
nA
VCM = V– + 0.3V
VCM = V+ – 0.3V
en
µV/°C
l
VCM = V+ – 0.3V
IOS
1.5
l
= V– + 0.3V
Input Voltage Noise Density
f = 1kHz
20
nV/√Hz
Input Noise Voltage
f = 0.1Hz to 10Hz
2.5
µVP-P
625567fd
For more information www.linear.com/LTC6255
3
LTC6255/LTC6256/LTC6257
5V Electrical Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 5V, VCM = VOUT = VSUPPLY/2, CL = 10pF, VSHDN is unconnected.
SYMBOL PARAMETER
CONDITIONS
in
Input Current Noise Density
RIN
Input Resistance
CIN
Input Capacitance
CMRR
Common Mode Rejection Ratio
f = 1kHz, VCM = 0V to 4V (PNP Input)
f = 1kHz, VCM = 4V to 5V (NPN Input)
Differential
Common Mode
Differential
Common Mode
VCM = 0.3V to 3.5V
IVR
PSRR
AV
Input Voltage Range
Power Supply Rejection Ratio
Large Signal Gain
Output Swing Low (Input Overdrive 30mV).
Measured from V–
VCM = 0.4V, VS Ranges from 1.8V to 5V
VOUT = 0.5V to 4.5V, RLOAD = 100k
IS
Supply Current per Amplifier
5.1
100
200
50
6
10
l
30
l
24
30
l
75
l
l
l
17
8
57
42
65
l
ISHDN
Shutdown Pin Current
VIL
VIH
tON
tOFF
BW
GBW
SHDN Input Low Voltage
SHDN Input High Voltage
Turn-On Time
Turn-Off Time
–3dB Closed Loop Bandwidth
Gain-Bandwidth Product
VSHDN = 0.6V
VSHDN = 1.5V
Disable
Enable
SHDN Toggle from 0V to 5V
SHDN Toggle from 5V to 0V
AV = 1
f = 200kHz
Settling Time, 0.5V to 4.5V, Unity Gain
SR
Slew Rate
FPBW
THD+N
Full Power Bandwidth (Note 8)
Total Harmonic Distortion and Noise
ILEAK
Output Leakage Current in Shutdown
4
0.1%
0.01%
AV = –1, VOUT = 0.5V to 4.5V, CLOAD = 10pF,
RF = RG = 10kΩ
4VP-P
f = 500Hz, AV = 2, RL = 4kΩ, VOUTP-P = 1V
VIN = 2.25V to 2.75V
VSHDN = 0V, VOUT = 0V
VSHDN = 0V, VOUT = 5V
85
100
7
12
l –1400 –1000
l –900 –500
0.6
l
l
l
tS
25
35
30
40
75
95
55
60
80
90
150
170
35
6
Supply Current in Shutdown
MAX
380
850
1
10
0.4
0.3
100
l
ISOURCE = 1mA
Output Short-Circuit Current
l
No Load
ISOURCE = 100µA
ISC
l
TYP
l
ISINK = 1mA
Output Swing High (Input Overdrive 30mV).
Measured from V+
l
75
71
–0.1
82
78
50
28
25
8
No Load
ISINK = 100µA
VOH
l
l
VOUT = 0.5V to 4.5V, RLOAD = 10k
VOL
MIN
l
1.5
2.5
2
1.0
0.75
50
20
4.5
6.5
4
6
1.8
140
0.0022
93
l
l
–400
–400
400
400
UNITS
fA/√Hz
fA/√Hz
MΩ
MΩ
pF
pF
dB
dB
V
dB
dB
V/mV
V/mV
V/mV
V/mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
µA
µA
µA
µA
nA
nA
V
V
µs
µs
MHz
MHz
MHz
µs
µs
V/µs
V/µs
kHz
%
dB
nA
nA
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
1.8V Electrical Characteristics
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 1.8V, VCM = VOUT = 0.4V, CL = 10pF, VSHDN is
unconnected.
SYMBOL PARAMETER
VOS
Input Offset Voltage
CONDITIONS
VCM
MIN
TYP
MAX
UNITS
–350
–700
100
l
350
700
µV
µV
–350
–700
100
l
350
700
µV
µV
= V– + 0.3V
VCM = V+ – 0.3V
VOS TC
IB
Input Offset Voltage Drift
Input Bias Current (Note 7)
VCM = V– + 0.3V, V+ – 0.3V
VCM
Input Offset Current
–50
–75
–8
50
75
nA
nA
–50
–75
5
l
50
75
nA
nA
–20
–35
2
l
20
35
nA
nA
–20
–35
2
l
20
35
nA
nA
VCM = V– + 0.3V
VCM = V+ – 0.3V
en
Input Voltage Noise Density
f = 1kHz, VCM = 0.4V
µV/°C
l
VCM = V+ – 0.3V
IOS
1.5
l
= V– + 0.3V
21
nV/√Hz
Input Noise Voltage
f = 0.1Hz to 10Hz
2.5
µVP-P
in
Input Current Noise Density
f = 1kHz, VCM = 0V to 0.8V (PNP Input)
f = 1kHz, VCM = 1V to 1.8V (NPN Input)
580
870
fA/√Hz
fA/√Hz
RIN
Input Resistance
Differential
Common Mode
1
10
MΩ
MΩ
CIN
Input Capacitance
Differential
Common Mode
0.4
0.3
pF
pF
CMRR
Common Mode Rejection Ratio
VCM = 0.2V to 1.6V
90
dB
dB
IVR
Input Voltage Range
PSRR
Power Supply Rejection Ratio
AV
Large Signal Gain
l
74
67
l
–0.1
100
l
82
78
dB
dB
30
17
110
l
V/mV
V/mV
15
5
50
l
V/mV
V/mV
VCM = 0.4V, VS Ranges from 1.8V to 5V
VOUT = 0.5V to 1.3V, RLOAD = 100k
VOUT = 0.5V to 1.3V, RLOAD = 10k
VOL
Output Swing Low (Input Overdrive 30mV),
Measured from V–
No Load
1.9
6
35
40
mV
mV
10
40
45
mV
mV
30
75
90
mV
mV
l
ISINK = 100µA
l
ISINK = 1mA
l
V
625567fd
For more information www.linear.com/LTC6255
5
LTC6255/LTC6256/LTC6257
1.8V Electrical Characteristics
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. VSUPPLY = 1.8V, VCM = VOUT = 0.4V, CL = 10pF, VSHDN is
unconnected.
SYMBOL PARAMETER
VOH
Output Swing High (Input Overdrive 30mV),
Measured from V+
CONDITIONS
MIN
No Load
TYP
MAX
24
55
60
mV
mV
30
65
75
mV
mV
75
135
150
mV
mV
l
ISOURCE = 100µA
l
ISOURCE = 1mA
l
ISC
IS
Output Short-Circuit Current
UNITS
12
3
17
l
53
35
60
l
68
83
µA
µA
1.4
2.0
3.0
µA
µA
Supply Current per Amplifier
Supply Current in Shutdown
l
ISHDN
Shutdown Pin Current
VSHDN = 0.5V
VSHDN = 1.3V
l
l
VIL
SHDN Input Low Voltage
Disable
l
VIH
SHDN Input High Voltage
Enable
l
tON
Turn-On Time
SHDN Toggle From 0V to 1.8V
150
µs
tOFF
Turn-Off Time
SHDN Toggle From 1.8V to 0V
50
µs
4
MHz
6
MHz
MHz
4
6
µs
µs
BW
–3dB Closed Loop Bandwidth
AV = 1
GBW
Gain-Bandwidth Product
f = 200kHz
l
TS
Settling Time, 0.3V to 1.5V, Unity Gain
0.1%
0.01%
SR
Slew Rate
AV = –1, VOUT = 0.3V to 1.5V, CLOAD = 10pF
l
FPBW
Full Power Bandwidth (Note 8)
1.2VP-P
THD+N
Total Harmonic Distortion and Noise
f = 500Hz, AV = 2, RL = 4kΩ, VOUTP-P = 1V
VIN = 0.25V to 0.75V
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: The inputs are protected by back-to-back diodes as well as ESD
protection diodes to each power supply. If the differential input voltage
exceeds 3.6V or the input extends more than 500mV beyond the power
supply, the input current should be limited to less than 10mA.
Note 3: A heat sink may be required to keep the junction temperature
below the absolute maximum rating when the output is shorted
indefinitely.
Note 4: The LTC6255C/LTC6256C/LTC6257C and LTC6255I/LTC6256I/
LTC6257I are guaranteed functional over the temperature range of –40°C
to 85°C. The LTC6255H/LTC6256H/LTC6257H are guaranteed functional
over the temperature range of –40°C to 125°C.
6
–480
–160
mA
mA
–350
–40
nA
nA
0.5
1.3
2.4
1.8
0.9
0.75
V
V
1.5
V/µs
V/µs
400
kHz
0.006
84
%
dB
Note 5: The LTC6255C/LTC6256C/LTC6257C are guaranteed to meet
the specified performance from 0°C to 70°C. The LTC6255C/LTC6256C/
LTC6257C are designed, characterized and expected to meet specified
performance from –40°C to 85°C but are not tested or QA sampled at
these temperatures. The LTC6255I/LTC6256I/LTC6257I are guaranteed
to meet specified performance from –40°C to 85°C. The LTC6255H/
LTC6256H/LTC6257H are guaranteed to meet specified performance
from –40°C to 125°C.
Note 6: Thermal resistance varies with the amount of PC board metal
connected to the package. The specified values are for short traces
connected to the leads.
Note 7: The input bias current is the average of the currents through the
positive and negative input pins.
Note 8: Full power bandwidth is calculated from the slew rate FPBW =
SR/π • VP-P.
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Typical Performance Characteristics
Input VOS Histogram
140
VS = ±2.5V
VCM = 0V
NUMBER OF UNITS
100
50
100
80
60
40
20
0
–1000
20
500
0
–1000
1000
–600
625567 G01
500
H-GRADE
INDUSTRIAL
COMMERCIAL
16
VS = ±2.5V
VCM = 0V
10
8
–200
200
VOS (µV)
600
625567 G03
VOS vs Common Mode
Voltage
500
VCM = 0.4V
300
300
200
200
100
100
0
–100
0
–100
6
–200
–200
4
–300
–300
2
–400
–400
0
–3.5
–500
1.8
–2.5
–1.5
–0.5 0 0.5
DISTRIBUTION (µV/°C)
1.5
2.3
2.8
3.3
3.8
4.3
SUPPLY VOLTAGE (V)
100
INPUT BIAS CURRENT (nA)
0
–5
–55°C, 25°C
125°C
–10
–15
–20
–25
100
40
20
+IN
–20
–IN
–40
–60
–80
–5 –4 –3 –2 –1 0 1
IOUT (mA)
2
3
4
5
625567 G07
–100
4
3
5
625567 G06
VS = 1.8V, 0V
80
60
0
2
Input Bias Current vs Common
Mode Voltage
VS = 5V, 0V
80
10
1
VCM (V)
Input Bias Current vs Common
Mode Voltage
VOS vs IOUT
15
0
625567 G05
VS = ±2.5V
20 VCM = 0V
5
–500
4.8
INPUT BIAS CURRENT (nA)
25
VS = 5V, 0V
400
625567 G04
VOS (mV)
1000
625567 G02
VOS vs Supply Voltage (25°C)
400
VOS (µV)
12
0
VOS (µV)
VOS TC (–40°C to 125°C)
18
14
–500
300
VS = ±2.5V
250
VCM = 0V
200
150
100
50
0
–50
–100
–150
–200
–250
–300
–350
–400
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
VOS (µV)
NUMBER OF UNITS
150
VOS vs Temperature
VS = ±2.5V
VCM = 2.2V
120
200
VOS (µV)
Input VOS Histogram
VOS (µV)
250
60
40
20
+IN
0
–IN
–20
–40
–60
–80
0
1
2
3
VCM (V)
4
5
625567 G08
–100
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
VCM (V)
625567 G09
625567fd
For more information www.linear.com/LTC6255
7
LTC6255/LTC6256/LTC6257
Typical Performance Characteristics
Input Bias Current
vs Supply Voltage
50
15
10
5
0
–5
+IN
–10
–15
–IN
–20
100
VS = ±2.5V
40
30
20
10
0
–10
–20
VCM = –2V
–30
–50
–40
4.8
10
60
TEMPERATURE (°C)
60
VS = 1.8V, 0V
40
20
0
–40
–15
10
35
60
85
TEMPERATURE (°C)
110
–0.05
–0.10
–0.15
–0.20
–0.25
125°C, VS = 5V
85°C, VS = 5V
25°C, VS = 5V
–40°C, VS = 5V
–0.30
–0.35
0
1
2
3
LOAD CURRENT (mA)
4
MAXIMUM SINKING CURRENT (mA)
MAXIMUM SOURCING CURRENT (mA)
100
VCM = 0.4V
50
125°C
40
–40°C
30
20
25°C
10
0
1.8
2.3
2.8 3.3 3.8 4.3
SUPPLY VOLTAGE (V)
5
0.5
4.8
625567 G16
90
0.3
0.2
0.1
0
0
1
2
3
LOAD CURRENT (mA)
4
5
625567 G15
0.1Hz to 10Hz Output
Voltage Noise
5
VS = ±2.5V
4 VCM = 0V
AV = 1
3
VCM = 0.4V
80
70
–40°C
60
50
25°C
40
30
20
2
1
0
–1
–2
–3
125°C
10
0
1.8
5
125°C, VS = 1.8V
125°C, VS = 5V
85°C, VS = 1.8V
85°C, VS = 5V
25°C, VS = 1.8V
25°C, VS = 5V
–40°C, VS = 1.8V
–40°C, VS = 5V
0.4
Output Short-Circuit Current
vs Supply Voltage (Sinking)
60
4
625567 G14
Output Short-Circuit Current
vs Supply Voltage (Sourcing)
70
2
3
SUPPLY VOLTAGE (V)
Output Saturation Voltage
vs Load Current (Output Low)
125°C, VS = 1.8V
85°C, VS = 1.8V
25°C, VS = 1.8V
–40°C, VS = 1.8V
625567 G13
80
1
625567 G12
Output Saturation Voltage
vs Load Current (Output High)
SATURATION VOLTAGE FROM TOP RAIL (V)
SUPPLY CURRENT (µA)
VS = 5V, 0V
0
625567 G11
0
VCM = 0.4V
80
8
–40°C
40
0
110
SATURATION VOLTAGE FROM BOTTOM RAIL (V)
2.8
3.8
SUPPLY VOLTAGE (V)
Supply Current vs Temperature
90
25°C
60
20
625567 G10
100
125°C
–40
–25
1.8
100
VCM = 0.4V
80
VCM = 2V
SUPPLY CURRENT (µA)
VCM = 0.4V
INPUT BIAS CURRENT (nA)
INPUT BIAS CURRENT (nA)
20
NOISE VOLTAGE (µV)
25
Supply Current vs Supply Voltage
per Channel
Input Bias Current vs Temperature
2.3
2.8
3.3
3.8
4.3
SUPPLY VOLTAGE (V)
–4
4.8
625567 G17
–5
0
2
4
6
TIME (s)
8
10
625567 G18
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
300
VS = ±2.5V
VCM = 0V
250
200
150
100
50
0
1
10
100
1k
FREQUENCY (Hz)
10k
100k
Wide Band Noise Voltage Density
vs Frequency
VS = ±2.5V
70 VCM = 0V
60
50
40
30
20
10
0
0
2M
4M
FREQUENCY (Hz)
1
VS = ±0.9V
VCM = 0V
AV = 2
RG = RF = 10kΩ
1
10
AMPLITUDE (dB)
THD+N (%)
500Hz
0.001
0.01
0.1
VOUTP-P (V)
625567 G22
150
2.5
–110
20
0
–140
–10
–150
5.5
625567 G25
–160
10M
100k
1M
FREQUENCY (Hz)
625567 G24
Power Supply Rejection Ratio
vs Frequency
150
VS = ±2.5V
VCM = 0V
V+, VS = 1.8V, 0V
V+, VS = 5V, 0V
V–, VS = 1.8V, 0V
V–, VS = 5V, 0V
100
50
V – = 0V
0.5 S
VSTEP = VS+ – 1V
AV = 1
RF = RG = 10kΩ
0
1.5
2.5
3.5
4.5
VS+, SUPPLY VOLTAGE (V)
–130
PSSR (dB)
FALLING
–120
MAGNITUDE
10
625567 G23
CMMR (dB)
SLEW RATE (V/µs)
1.0
–100
30
100
1.5
–70
–90
PHASE
40
–20
10k
1
–60
–80
50
2.0
RISING
10k
VS = ±2.5V
VCM = 0V
Common Mode Rejection Ratio
vs Frequency
Slew Rate vs Supply Voltage
1k
100
FREQUENCY (Hz)
PHASE
VOUTP-P (V)
0
60
0.01
10
5
70
1kHz
1
10
Gain and Phase vs Frequency
VS = ±2.5V
VCM = 0V
AV = 2
RF = RG = 10kΩ
500Hz
0.1
15
80
0.1
THD+N (%)
0.1
0.001
0.01
20
625567 G21
Total Harmonic Distortion
and Noise
1kHz
VS = ±2.5V
VCM = 0V
625567 G20
Total Harmonic Distortion
and Noise
0.01
25
6M
625567 G19
1
Input Noise Current vs Frequency
80
INPUT REFERRED NOISE CURRENT (pA/√Hz)
Noise Voltage Density
vs Frequency
INPUT REFERRED NOISE VOLTAGE DENSITY (nV/√Hz)
INPUT REFERRED NOISE VOLTAGE DENSITY (nV/√Hz)
Typical Performance Characteristics
0
50
1k
10k
1M
100k
FREQUENCY (Hz)
10M
625567 G26
0
0.001 0.01
0.1
1
10 100
FREQUENCY (Hz)
1k
10k
625567 G27
625567fd
For more information www.linear.com/LTC6255
9
LTC6255/LTC6256/LTC6257
Typical Performance Characteristics
Capacitive Load Handling
Overshoot vs Capacitive Load
Large-Signal Response
16
6
0.5
0
–0.5
–10
4
2
–2.0
1
10
–2.5
100
CLOAD (nF)
0
–0.01
20
40
60
TIME (µs)
80
0.04
–0.5
–1.5
–0.03
–2.0
–0.04
0
20
40
60
TIME (µs)
80
VS = 1.8V, 0V
70 VCM = 0.4V
100
AV = 1
0.1
1
10
100
FREQUENCY (Hz)
1k
10k
625567 G34
10
0
200
400
600
TIME (µs)
800
60
625567 G33
90
VS = 5V, 0V
80 VCM = 0.4V
125°C
–40°C
50
25°C
40
30
20
0
1000
Supply Current vs SHDN Pin
Voltage
10
0.1
–0.05
80
SUPPLY CURRENT (µA)
OUTPUT IMPEDANCE (Ω)
100
625567 G32
VS = ±2.5V
VCM = 0V
0.01
0.01
0
–0.02
–2.5
VS = ±2.5V
AV = 1
CLOAD = 100nF
–0.01
Supply Current vs SHDN Pin
Voltage
1
100
0.01
–1.0
Output Impedance vs Frequency
10
80
0.02
0
100
AV = 10
60
40
TIME (µs)
0.03
VS = ±2.5V
AV = 1
CLOAD = 100nF
625567 G31
1000
20
Small-Signal Response
2.0
0.5
CLOAD = 10pF
CLOAD = 100pF
CLOAD = 1nF
CLOAD = 10nF
0
0
625567 G30
0.05
1.5
VOLTAGE (V)
VOLTAGE (V)
0.01
–0.04
–0.9
100
2.5
1.0
–0.03
80
Large-Signal Response
0.02
–0.02
40
60
TIME (ms)
VOLTAGE (V)
0.03
20
625567 G29
VS = ±0.9V
AV = 1
RLOAD = 10kΩ
0.04
0
CLOAD = 10pF
CLOAD = 100pF
CLOAD = 1nF
CLOAD = 10nF
–0.6
625567 G28
Small-Signal Response
0.05
–0.3
SUPPLY CURRENT (µA)
0.1
0
CLOAD = 10pF
CLOAD = 100pF
CLOAD = 1nF
CLOAD = 10nF
–1.5
VS = ±0.9V
AV = 1
RLOAD = 10kΩ
0.3
VOLTAGE (V)
1.0
8
0.6
VS = ±2.5V
AV = 1
RLOAD = 10kΩ
1.5
10
–0.05
0.9
2.0
VOLTAGE (V)
OVERSHOOT (%)
VS = ±2.5V
14 VCM = 0V
AV = 1
V = ±2V
12 IN
0
0.01
Large-Signal Response
2.5
–40°C
70
25°C
60
125°C
50
40
30
20
10
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
VSHDN (V)
625567 G35
0
0
0.2
0.4
0.6 0.8 1.0
VSHDN (V)
1.2
1.4
1.6
625567 G36
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Pin Functions
V–: Negative Power Supply. It is normally tied to ground.
It can also be tied to a voltage other than ground as long
as the voltage between V+ and V– is from 1.8V to 5.25V.
If it is not connected to ground, bypass it with a capacitor
of 0.1µF as close to the part as possible.
–IN: Inverting Input of the Amplifier. Voltage range of this
pin can go from V– – 0.1V to V+ + 0.1V.
+IN: Non-Inverting Input of Amplifier. This pin has the
same voltage range as –IN.
V+: Positive Power Supply. Typically the voltage is from
1.8V to 5.25V. Split supplies are possible as long as the
voltage between V+ and V– is between 1.8V and 5.25V. A
bypass capacitor of 0.1µF as close to the part as possible
should be used between power supply pins or between
supply pins and ground.
SHDN: Active Low Shutdown. Shutdown threshold is 0.6V
above negative rail. If left unconnected, the amplifier will
be on.
OUT: Amplifier Output. The voltage range extends to within
millivolts of each supply rail.
Simplified Schematic
V+
R6
5M
+
R3
V+
I2
R5
Q15
V–
ESDD1
R4
+
ESDD2
C2
I1
Q12
Q11
ESDD5
Q13
+IN
SHDN
LOGIC
D6
D8
D5
D7
Q5
Q4
–IN
ESDD4
V–
Q3
+
VBIAS
Q1
CC
Q2
ESDD3
Q9
V–
BUFFER AND
OUTPUT BIAS
Q10
V+
OUT
I3
ESDD6
Q8
Q16
C1
Q17
Q18
Q19
Q7
Q14
Q6
R1
V–
R2
625567 F01
Figure 1. LTC6255/LTC6256/LTC6257 Simplified Schematic
625567fd
For more information www.linear.com/LTC6255
11
LTC6255/LTC6256/LTC6257
Operation
The LTC6255 family input signal range extends beyond
the negative and positive power supplies. The output can
even extend all the way to the negative supply with the
proper external pull-down current source. Figure 1 depicts
a Simplified Schematic of the amplifier. The input stage
is comprised of two differential amplifiers, a PNP stage
Q1/Q2 and NPN stage Q3/Q4 that are active over different
ranges of common mode input voltage. The PNP stage
is active between the negative power supply to approximately 1V below the positive supply. As the input voltage
approaches the positive supply, transistor Q5 will steer the
tail current I1 to the current mirror Q6/Q7, activating the
NPN differential pair and the PNP pair becomes inactive
for the remaining input common mode range. Also for the
input stage, devices Q17, Q18 and Q19 act to cancel the
bias current of the PNP input pair. When Q1/Q2 is active,
the current in Q16 is controlled to be the same as the
current Q1/Q2. Thus, the base current of Q16 is normally
equal to the base current of the input devices of Q1/Q2.
Similar circuitry (not shown) is used to cancel the base
current of Q3/Q4. The buffer and output bias stage uses
a special compensation technique to take full advantage
of the process technology to drive high capacitive loads.
The common emitter topology of Q14/Q15 enables the
output to swing from rail to rail.
Applications Information
Low Supply Voltage and Low Power Consumption
Low Input Referred Noise
The LTC6255 family of operational amplifiers can operate
with power supply voltages from 1.8V to 5.25V. Each amplifier draws only 65µA. The low supply voltage capability
and low supply current are ideal for portable applications.
The LTC6255 family provides a low input referred noise
of 20nV/√Hz at 1kHz. The noise density will grow slowly
with the frequency in wideband range. The average noise
voltage density over 3MHz range is less than 24nV/√Hz.
The LTC6255 family is ideal for low noise and low power
signal processing applications.
High Capacitive Load Driving Capability and Wide
Bandwidth
The LTC6255 family is optimized for wide bandwidth
low power applications. They have an extremely high
gain-bandwidth to power ratio and are unity gain stable.
When the load capacitance increases, the increased capacitance at the output pushed the non-dominant pole
to lower frequency in the open loop frequency response,
worsening the phase and gain margin. They are designed
to directly drive up to 100nF capacitive load in unity gain
configuration (see Typical Performance Characteristics,
Capacitive Load Handling). Higher gain configurations
tend to have better capacitive drive capability than lower
gain configurations due to lower closed loop bandwidth
and hence higher phase margin.
12
Low Input Offset Voltage
The LTC6255 family has a low offset voltage of 350μV
maximum which is essential for precision applications. The
offset voltage is trimmed with a proprietary trim algorithm
to ensure low offset voltage over the entire common mode
voltage range.
Low Input Bias Current
The LTC6255 family uses a bias current cancellation circuit
to compensate for the base current of the input transistors.
When the input common mode voltage is within 200mV
of either rail, the bias cancellation circuit are no longer active. For common mode voltages ranging from 0.2V above
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Applications Information
the negative supply to 0.2V below the positive supply, the
low input bias current allows the amplifiers to be used in
applications with high resistance sources.
Ground Sensing and Rail to Rail Output
The LTC6255 family has excellent output drive capability,
delivering over 10mA of output drive current. The output
stage is a rail-to-rail topology that is capable of swinging to
within 30mV of either rail. If output swing to the negative
rail is required, an external pull down resistor to a negative
supply can be added. For 5V/0V op amp supplies, a pull
down resistor of 2.1k to –2V will allow a ‘true zero’ output
swing. In this case, the output can swing all the way to
the bottom rail while maintaining 80dB of open loop gain.
Since the inputs can go 100mV beyond either rail, the op
amp can easily perform ‘true ground’ sensing.
The maximum output current is a function of total supply
voltage. As the supply voltage to the amplifier increases,
the output current capability also increases. Attention must
be paid to keep the junction temperature of the IC below
150°C when the output is in continuous short-circuit. The
output of the amplifier has reverse-biased diodes connected to each supply. The output should not be forced
more than 0.5V beyond either supply, otherwise current
will flow through these diodes.
Input Protection and Output Overdrive
To prevent breakdown of the input transistors, the input
stages are protected against a large differential input
voltage by two pairs of back-to-back diodes, D5 to D8. If
the differential input voltage exceeds 1.4V, the current in
these diodes must be limited to less than 10mA. These
amplifiers are not intended for open loop applications such
as comparators. When the output stage is overdriven,
internal limiting circuitry is activated to improve overdrive
recovery. In some applications, this circuitry may draw as
much as 1mA supply current.
Supply Voltage Ramping
Fast ramping of the supply voltage can cause a current
glitch in the internal ESD protection circuits. Depending on
the supply inductance, this could result in a supply voltage transient that exceeds the maximum rating. A supply
voltage ramp time of greater than 1ms is recommended.
Feedback Components
Care must be taken to ensure that the pole formed by the
feedback resistors and the parasitic capacitance at the
inverting input does not degrade stability. For example, in
a gain of +2 configuration with gain and feedback resistors of 10k, a poorly designed circuit board layout with
parasitic capacitance of 5pF (part +PC board) at the amplifier’s inverting input will cause the amplifier to oscillate
due to a pole formed at 3.2MHz. An additional capacitor
of 5pF across the feedback resistor as shown in Figure 2
will eliminate any ringing or oscillation.
Shutdown
The single and dual versions have SHDN pins that can
shut down the amplifier to less than 7µA supply current.
The SHDN pin voltage needs to be within 0.6V of V– for
the amplifier to shut down. During shutdown, the output
will be in high output resistance state, which is suitable
for multiplexer applications. When left floating, the SHDN
pin is internally pulled up to the positive supply and the
amplifier remains enabled.
5pF
10k
–
10k
LTC6255
CPAR
+
VIN
VOUT
625567 F02
Figure 2.
ESD
The LTC6255 family has reverse-biased ESD protection
diodes on all inputs and output as shown in Figure 1.
625567fd
For more information www.linear.com/LTC6255
13
LTC6255/LTC6256/LTC6257
Typical Applications
Frequency Response of 40dB
Gain Amplifier
200kHz 130µA Gain-of-100 Amplifier
50
40
0.9V
30
+
20
1/2 LTC6256
+
–
1/2 LTC6256
GAIN (dB)
VIN
VOUT
–
–0.9V
10
0
–10
–20
90.9k
10k
90.9k
10k
–30
–40
625567 F03a
–50
10
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
625567 F03b
Figure 3. Gain of 100 Amplifier (3dB Bandwidth of 200kHz on 130µA Supply Current)
LTC6255 Very Low Power 2nd Order Lowpass Filter
Figure 5 with the equations to calculate the RC components
for cutoff frequencies up to 100kHz for a Butterworth or a
Bessel approximation (a Bessel lowpass filter has very low
transient response overshoot). In addition the equations
for a 4th order lowpass filter are provided to calculate the
RC components for two cascaded 2nd order sections.
The LTC6256 circuit shown in Figure 4 is a 2nd order,
100kHz, Butterworth lowpass filter. The filter’s differential
output maximizes the dynamic range in very low voltage
operation. A general 2nd order lowpass circuit is shown in
A, 1.8V, 140µA, 100kHz, Lowpass Filter
(Single-Ended Input and Differential Output)
2.49k
VIN
2.49k
2
1000pF
3
1.8V
100k
100k
–
+
2.49k
8
1/2 LTC6256
0
2.49k
100pF
10k
6
VOUT–
0.1µF
1
6
5
–
1/2 LTC6256
+
–6
7
VOUT+
4
GAIN (dB)
1.8V
Frequency Response
–12
–18
–24
–30
–36
10µF
625567 F04a
–42
10k
100k
FREQUENCY (Hz)
1M
625567 F04b
Figure 4
14
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Typical Applications
Table 1.
V+ 0.1µF
R2
R1
VIN
fO AND Q VALUES
C2
R3
C1
10µF
–
3
+
V+
1
LTC6255
5
2
100k
2nd Order Lowpass
6
4
SHDN
100k
625567 F05
VOUT
Butterworth
fO = f–3dB
Q = 0.707
Bessel
fO = 1.274 • f–3dB
Q = 0.577
Butterworth
fO = f–3dB
fO = f–3dB
Q = 0.541
Q = 1.307
Bessel
fO = 1.419 • f–3dB
fO = 1.591 • f–3dB
Q = 0.522
Q = 0.806
4th Order Lowpass
Figure 5
2µs Rise Time Analog 1A Pulsed LED Current Driver
RC Component Equations
⎛
C2 ⎞
1− ⎜1− 4 Q2 [Gain+ 1] ⎟
⎝
C1 ⎠
R2 =
4 π Q fO C2
R3 =
1
2
4 π R2 C1 C2 fO
Gain =
R1=
2
R2
R1
R2
Gain
C1> 4 Q2 (Gain+ 1) C2
Maximum f–3dB = 100kHz and
Maximum Gain =
100kHz
f –3dB
Figure 6 shows the LTC6255 applied as a fast, efficient
analog LED current driver. High power LEDs are used in
applications ranging from brake lights to video projectors.
Most LED applications pulse the LEDs for the best efficiency,
and many applications take advantage of control of both
pulse width and analog current amplitude.
In order to extend the circuit’s input range to accommodate
5V output DACs, the input voltage is initially divided by
50 through the R1:R2 divider. The reduced step is applied
to the LTC6255 non inverting input, and LTC6255 output
rises until MOSFETs Q1 through Q3 begin to turn on,
increasing the current in their drains and therefore the
LED. The amount of current is sensed on R3, and fed back
to the LTC6255 inverting input through R5. The loop is
compensated by R5 and C1, with R4 distancing the gate
capacitance from the op amp output for the best time
domain response. 10% to 90% rise time was measured
at 2µs on a 10mA to 1A pulse. Starting at 0 current there
is an additional delay of 2.7µs.
It may seem strange to use a micropower op amp in a
high current LED application, but it can be justified by the
low duty cycles encountered in LED drive applications. A
one amp LED is quite bright even when driven at 1% or
even 0.1% duty cycles and these constitute 10mA and
1mA average current levels respectively, in which case
the supply current of the op amp becomes noticeable. The
LTC6255 combines 6.5MHz of gain-bandwidth product and
1.8V/μs slew rate on a supply current budget of only 65µA.
625567fd
For more information www.linear.com/LTC6255
15
LTC6255/LTC6256/LTC6257
Typical Applications
When VIN is at 0V, the op amp supply current is nominally
65µA, but the 450µV maximum input offset may appear
across R3 inducing a 4.5mA current in the LED. Some applications want a guaranteed zero LED current at VIN = 0, and
this is the purpose of RUP. RUP forces 5µA reverse current
through R5 creating a negative 1.2mV output offset at R3.
This guarantees a zero LED current, but note that the op
amp supply current rises from 65µA to a still respectable
650µA in this case due to internal protection circuitry for
the output stage. For reduced current, the LTC6255 can
be shut down, but the output becomes high impedance
and may leak high which will turn on the MOSFETs and
LED hard. Adding pull-down resistor RSD ensures that the
LTC6255 output goes low when shutting down.
2µs Rise Time Analog 1A Pulsed LED Current Driver
VIN
R1
9.76k
R2
200Ω
5V
RUP
1M**
+
–
5V
ILED = VIN • 200mA/V
5V
SHDN
LTC6255
LED
OSRAM
LRW5SM
ILED
R4
51Ω
C1
220pF
Q1
Q2
Q3
Q1 TO Q3
MOSFETs
3× 2N7000
RSD
100k* R5
240Ω
* RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL.
** RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL.
STANDBY SUPPLY CURRENT WITH VIN = 0: 65µA RUP OPEN
650µA RUP INSTALLED
10% TO 90% RISE TIME: 10mA TO 1A, 2µs
0mA TO 1A, ADD 2.7µs DELAY
R3
0.1Ω
100mW
625567 F06
Figure 6. LTC6255 Applied as a LED Current Driver with 2µs Rise Time
VIN
10mA TO 1A
0mA TO 1A
(EXTRA DELAY)
625567 F07
Figure 7. Time Domain Response Showing 2µs Rise Time. Top Waveform
Is VIN. Middle Waveform Is the 10mA to 1A Step Measured at R3, then the
0mA to 1A Step Showing Extra 2.7µs Delay When Recovering From 0mA
16
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
KC Package
8-Lead Plastic UTDFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1749 Rev Ø)
1.37 ±0.05
0.70 ±0.05
2.55 ±0.05
0.64 ±0.05
1.15 ±0.05
PACKAGE
OUTLINE
0.25 ±0.05
0.45 BSC
1.35 REF
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.115
TYP 5
R = 0.05
TYP
2.00 ±0.10
2.00 ±0.10
1.37 ±0.10
8
0.40 ±0.10
PIN 1 NOTCH
R = 0.20 OR
0.25 × 45°
CHAMFER
0.64 ±0.10
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
(KC8) UTDFN 0107 REVØ
4
0.125 REF
0.55 ±0.05
0.00 – 0.05
1
0.23 ±0.05
0.45 BSC
1.35 REF
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
625567fd
For more information www.linear.com/LTC6255
17
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
18
0.01 – 0.10
1.00 MAX
1.90 BSC
S6 TSOT-23 0302 REV B
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
TS8 Package
8-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1637 Rev A)
0.40
MAX
2.90 BSC
(NOTE 4)
0.65
REF
1.22 REF
1.4 MIN
3.85 MAX 2.62 REF
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.22 – 0.36
8 PLCS (NOTE 3)
0.65 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
1.95 BSC
TS8 TSOT-23 0710 REV A
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
625567fd
For more information www.linear.com/LTC6255
19
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev G)
0.889 ±0.127
(.035 ±.005)
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.65
(.0256)
BSC
0.42 ± 0.038
(.0165 ±.0015)
TYP
8
7 6 5
0.52
(.0205)
REF
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
DETAIL “A”
1
2 3
4
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
PLANE
0.22 – 0.38
(.009 – .015)
TYP
0.65
(.0256)
BSC
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS8) 0213 REV G
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
20
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661 Rev F)
0.889 ±0.127
(.035 ±.005)
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
3.00 ±0.102
(.118 ±.004)
(NOTE 3)
0.50
0.305 ±0.038
(.0197)
(.0120 ±.0015)
BSC
TYP
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
10 9 8 7 6
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
DETAIL “A”
0.497 ±0.076
(.0196 ±.003)
REF
0° – 6° TYP
GAUGE PLANE
1 2 3 4 5
0.53 ±0.152
(.021 ±.006)
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.86
(.034)
REF
1.10
(.043)
MAX
0.17 – 0.27
(.007 – .011)
TYP
0.50
(.0197)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS) 0213 REV F
625567fd
For more information www.linear.com/LTC6255
21
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
MS Package
16-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1669 Rev A)
0.889 ±0.127
(.035 ±.005)
5.10
(.201)
MIN
3.20 – 3.45
(.126 – .136)
4.039 ±0.102
(.159 ±.004)
(NOTE 3)
0.50
(.0197)
BSC
0.305 ±0.038
(.0120 ±.0015)
TYP
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
DETAIL “A”
3.00 ±0.102
(.118 ±.004)
(NOTE 4)
4.90 ±0.152
(.193 ±.006)
0° – 6° TYP
0.280 ±0.076
(.011 ±.003)
REF
16151413121110 9
GAUGE PLANE
0.53 ±0.152
(.021 ±.006)
DETAIL “A”
0.18
(.007)
SEATING
PLANE
1.10
(.043)
MAX
0.17 – 0.27
(.007 – .011)
TYP
1234567 8
0.50
(.0197)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
22
0.86
(.034)
REF
0.1016 ±0.0508
(.004 ±.002)
MSOP (MS16) 0213 REV A
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
DC6 Package
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703 Rev B)
0.70 ±0.05
2.55 ±0.05
1.15 ±0.05 0.61 ±0.05
(2 SIDES)
PACKAGE
OUTLINE
0.25 ±0.05
0.50 BSC
1.42 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
R = 0.125
TYP
0.56 ±0.05
(2 SIDES)
0.40 ±0.10
4
6
2.00 ±0.10
(4 SIDES)
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
PIN 1 NOTCH
R = 0.20 OR
0.25 × 45°
CHAMFER
R = 0.05
TYP
0.200 REF
0.75 ±0.05
3
(DC6) DFN REV B 1309
1
0.25 ±0.05
0.50 BSC
1.37 ±0.05
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
625567fd
For more information www.linear.com/LTC6255
23
LTC6255/LTC6256/LTC6257
Package Description
Please refer to http://www.linear.com/product/LTC6255#packaging for the most recent package drawings.
DC8 Package
8-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1719 Rev A)
0.70 ±0.05
2.55 ±0.05
1.15 ±0.05 0.64 ±0.05
(2 SIDES)
PACKAGE
OUTLINE
0.25 ±0.05
0.45 BSC
1.37 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.05
TYP
2.00 ±0.10
(4 SIDES)
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
R = 0.115
TYP
5
8
0.40 ±0.10
0.64 ±0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
0.25 × 45°
CHAMFER
(DC8) DFN 0409 REVA
4
0.200 REF
1
0.23 ±0.05
0.45 BSC
0.75 ±0.05
1.37 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
24
625567fd
For more information www.linear.com/LTC6255
LTC6255/LTC6256/LTC6257
Revision History
REV
DATE
DESCRIPTION
A
9/10
Revised AV Conditions in 5V Electrical Characteristics and 1.8V Electrical Characteristics sections
B
9/11
PAGE NUMBER
4, 5
Revised IS MAX values in 5V Electrical Characteristics section
4
Revised ISC MIN values in 1.8V Electrical Characteristics section
6
Updated the Features and Description sections.
Added C-, H-, and I-grades to the Absolute Maximum Ratings and Order Information sections.
Updated 5V and 1.8V Electrical Characteristics sections.
1
2, 3
3 to 6
Revised the title of curve G32 in the Typical Performance Characteristics section.
8
Revised Figure 6 in the Typical Applications section.
17
Revised the Typical Application drawing on the back page.
24
C
7/15
Added 2mm × 2mm × 0.8mm DFN package
2, 3, 24
D
11/15
Added 2mm × 2mm × 0.8mm DFN package for LTC6255
2, 3, 23
625567fd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection
of its circuits
as described
herein will not infringe on existing patent rights.
For more
information
www.linear.com/LTC6255
25
LTC6255/LTC6256/LTC6257
Typical Application
2µs Rise Time Analog 1A Pulsed LED Current Driver.
LTC6255 Applied as a LED Current Driver with 2µs Rise Time
VIN
R1
9.76k
+
R2
200Ω
5V
–
RUP
1M**
5V
ILED = VIN • 200mA/V
5V
SHDN
LTC6255
C1
220pF
LED
OSRAM
LRW5SM
ILED
R4
51Ω
Q1
Q2
VIN
Q3
Q1 TO Q3
MOSFETs
3× 2N7000
RSD
100k* R5
240Ω
* RSD GUARANTEES LED OFF WHEN OP AMP SHDN. OTHERWISE OPTIONAL.
** RUP FORCES LED COMPLETELY OFF WHEN VIN = 0. OTHERWISE OPTIONAL.
STANDBY SUPPLY CURRENT WITH VIN = 0: 65µA RUP OPEN
650µA RUP INSTALLED
10% TO 90% RISE TIME: 10mA TO 1A, 2µs
0mA TO 1A, ADD 2.7µs DELAY
Time Domain Response Showing 2µs Rise Time. Top
Waveform Is VIN. Middle Waveform Is the 10mA to 1A Step
Measured at R3, then the 0mA to 1A Step Showing Extra
2.7µs Delay When Recovering From 0mA
10mA TO 1A
R3
0.1Ω
100mW
0mA TO 1A
(EXTRA DELAY)
625567 TA02b
625567 TA02a
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
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LTC6248
180MHz GBW, 1mA, 500μV VOS, RR In/Out, 2.5V to 5.25V, 90V/µs
Slew Rate
LT1498/LT1499
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LTC6081/LTC6082
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Amplifiers
3.6MHz GBW, 330μA, 70μV VOS, RR In/Out, 2.7V to 5.5V, 100dB CMRR
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LTC2052
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LTC1050/LTC1051/ Precision Zero-Drift, Operational Amplifierwith Internal
LTC1052
Capacitors
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120dB CMRR, 125dB PSRR
LTC6084/LTC6085
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1.5MHz GBW, 110μA, 750μV VOS, RR In/Out, 2.5V to 5.5V
LT1783
1.25MHz, Over-The-Top® Micropower, Rail-to-Rail Input
and Output Op Amp in SOT-23
1.25MHz GBW, 300μA, 800μV VOS, RR In/Out, 2.5V to 18V
LT1637/LT1638/
LT1639
1.1MHz, 0.4V/μs Over-The-Top Micropower, Rail-to-Rail
Input and Output Op Amps
1.1MHz GBW, 250μA, 350μV VOS, RR In/Out, 2.7V to 44V, 110dB CMRR
LTC2054/LTC2055
Single/Dual Micropower Zero-Drift Operational Amplifiers
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LT6010/LT6011/
LT6012
135μA, 14nV/√Hz, Rail-to-Rail Output Precision Op Amp
with Shutdown
330kHz GBW, 135μA, 35μV VOS, V– + 1.0V to V+ – 1.2V In, RR Out,
2.7V to 36V
LT1782
Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and 200kHz GBW, 55μA, 800μV VOS, RR In/Out, 2.5V to 18V
Output Op Amp
LT1636
Over-The-Top, Micropower Rail-to-Rail, Input and Output
Op Amp
200kHz GBW, 50μA, 225μV VOS, RR In/Out, 2.7V to 44V, –40°C to 125°C
LT1490A/LT1491A
Dual/Quad Over-The-Top, Micropower Rail-to-Rail Input
and Output Op Amps
200kHz GBW, 50μA, 500μV VOS, RR In/Out, 2V to 44V
LT2178/LT2179
17μA Max, Dual and Quad, Single Supply, Precision
Op Amps
85kHz GBW, 17μA, 70μV VOS, RR In/Out, 5V to 44V
LT6000/LT6001/
LT6002
Single, Dual and Quad, 1.8V, 13μA Precision Rail-to-Rail
Op Amps
50kHz GBW, 16μA , 600μV VOS(MAX), RR In/Out, 1.8V to 18V
26 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LTC6255
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com/LTC6255
625567fd
LT 1115 REV D • PRINTED IN USA
® LINEAR TECHNOLOGY CORPORATION 2010
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