LT6650CS5 [Linear]
Micropower, 400mV Reference with Rail-to-Rail Buffer Amplifier in SOT-23; 微功耗, 400mV的具有轨到轨缓冲放大器,采用SOT -23参考型号: | LT6650CS5 |
厂家: | Linear |
描述: | Micropower, 400mV Reference with Rail-to-Rail Buffer Amplifier in SOT-23 |
文件: | 总12页 (文件大小:441K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT6650
Micropower, 400mV
Reference with Rail-to-Rail
Buffer Amplifier in SOT-23
U
DESCRIPTIO
FEATURES
The LT®6650 is a micropower, low voltage 400mV refer-
ence. Operating with supplies from 1.4V up to 18V, the
device draws only 5.6µA typical, making it ideal for low
voltage systems as well as handheld instruments and
industrial control systems. With only two resistors the
internal buffer amplifier can scale the 400mV reference to
any desired value up to the supply voltage.
■
Low Quiescent Current 5.6
µ
A (typical)
■
Wide Supply Range: 1.4V to 18V
■
400mV Reference ±1% Maximum Accuracy Over
Temperature at 5V
■
■
■
■
■
■
■
Rail-to-Rail Buffer Amplifier
0.5% 400mV Maximum Initial Accuracy at 5V
Shunt Configurable
Sinks and Sources Current
The reference is postpackage-trimmed to increase the
output accuracy. The output can sink and source 200µA
over temperature. Quiescent power dissipation is 28µW.
Stability is ensured with any output capacitor of 1µF or
higher.
Wide Operational Range –40°C to 125°C
Externally Adjustable Output Voltage
Low Profile 1mm 5-lead SOT-23
(ThinSOT™) Package
U
TheLT6650isthelowestvoltageseriesreferenceavailable
in the 5-lead SOT-23 package.
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Battery-Operated Systems
ThinSOT is a trademark of Linear Technology Corporation.
■
Handheld Instruments
■
Industrial Control Systems
■
Data Acquisition Systems
■
Negative Voltage References
U
TYPICAL APPLICATIO
Battery-Powered 0.4V Reference
LT6650 Temperature Drift
402
V
= 1.4V TO 18V
IN
TYPICAL LT6650 PART
IN
V
= 5V
I
Q
≈ 6µA
4
NO LOAD
401
400
399
398
LT6650
IN
SINK 200µA
V
R
= 400mV
REFERENCE
+
–
V
OUT
SOURCE –200µA
0.4V
OUT
FB
5
1
GND
2
1µF
1µF
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
6650 TA01a
6650 TA01b
6650f
1
LT6650
W W U W
U
W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
NUMBER
Total Supply Voltage (VIN to GND)........................... 20V
FB Voltage (Note 2) ....................... 20V to (GND – 0.3V)
Output Voltage (OUT) .................... 20V to (GND – 0.3V)
Output Short Circuit Duration .......................... Indefinite
FB Input Current ................................................... 10mA
Operating Temperature Range ............... –40°C to 125°C
Specified Temperature Range
LT6650CS5 ............................................. 0°C to 70°C
LT6650IS5........................................... –40°C to 85°C
LT6650HS5 (Note 3) ......................... –40°C to 125°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range
TOP VIEW
LT6650CS5
LT6650IS5
LT6650HS5
FB
GND
1
2
3
5
4
OUT
IN
DNC*
S5 PART
MARKING
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 230°C/W
LBDV
*Do Not Connect
The temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Note 4) ............................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ELECTRICAL CHARACTERISTICS
otherwise noted.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
V
= 5V, C = 1µF, FB = OUT, no DC load, C = 1µF, unless
IN
IN
L
SYMBOL
V
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage (Notes 4, 5)
LT6650
398
–0.5
400
402
0.5
mV
%
OUT
LT6650CS5
LT6650IS5
LT6650HS5
●
●
397
–0.75
400
400
400
403
0.75
mV
%
●
●
396
–1
404
1
mV
%
●
●
394
–1.5
406
1.5
mV
%
V
Operating Input Voltage
Line Regulation
1.4
18
V
IN
∆V /∆V
1.4V ≤ V ≤ 18V
OUT
IN
IN
1
150
6
900
mV
ppm/V
LT6650CS5, LT6650IS5
LT6650HS5
●
●
7.5
1130
mV
ppm/V
●
●
8.5
1280
mV
ppm/V
∆V /∆I
OUT OUT
Load Regulation (Note 6)
Sourcing from 0µA to –200µA
–0.04
500
–0.2
2500
–0.4
5000
mV
ppm/mA
mV
●
●
ppm/mA
Sinking from 0µA to 200µA
0.24
3000
1
mV
ppm/mA
mV
12500
2
20000
●
●
ppm/mA
T
Output Voltage Temperature
Coefficient (Note 10)
●
30
ppm/°C
C
6650f
2
LT6650
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C.
otherwise noted.
The ● denotes the specifications which apply over the full operating
V
= 5V, C = 1µF, FB = OUT, no DC load, C = 1µF, unless
IN
IN
L
SYMBOL
∆V
PARAMETER
CONDITIONS
Referred to V = 1.8V, V = 1.4V
OUT
MIN
TYP
MAX
UNITS
Dropout Voltage (Note 7)
DO
IN
(R = 100k, R = 39.2k)
F
G
∆V
= –0.1%, I
= 0µA
75
100
150
mV
mV
OUT
OUT
OUT
OUT
OUT
OUT
●
●
●
∆V
∆V
= –0.1%, I
= –0.1%, I
= –200µA Sourcing
165
250
350
mV
mV
= 200µA Sinking (Note 11)
–300
–150
0
mV
mV
I
I
Short-Circuit Output Current
Supply Current
V
V
Shorted to GND
5
9
mA
mA
SC
IN
OUT
OUT
Shorted to V
IN
5.6
11
14
µA
µA
●
●
V
V
= 18V
5.9
12
15
µA
µA
IN
I
FB Pin Input Current
= V
= 400mV
FB
FB
OUT
1.2
0.5
10
15
30
nA
nA
nA
LT6650CS5, LT6650IS5
LT6650HS5
●
●
T
Turn-On Time
C
= 1µF
LOAD
ms
ON
e
Output Noise (Note 8)
0.1Hz ≤ ƒ ≤ 10Hz
10Hz ≤ ƒ ≤ 1KHz, I
20
23
µV
P-P
n
= –200µA Sourcing
µV
RMS
OUT
V
Hysteresis (Note 9)
∆T = 0°C to 70°C
●
●
●
●
0.1
250
0.24
600
mV
ppm
mV
HYS
∆T = –40°C to 85°C
ppm
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 6: Load regulation is measured on a pulse basis from no load to the
specified load current. Output changes due to die temperature change
must be taken into account separately.
Note 2: The FB pin is protected by an ESD diode to the ground. If the FB
input voltage exceeds –0.3V below ground, the FB input current should be
limited to less than 10mA. If the FB input voltage is greater than 5V, the FB
input current is expected to meet specified performance from Typical
Performance Characteristics but is not tested or QA sampled at this
voltage.
Note 3: If the part is operating at temperatures above 85°C, it is
recommended to enhance the stability margin by using an output
capacitor greater than 10µF or a series RC combination having a 100µs
equivalent time constant. See Application section for details.
Note 7: Dropout Voltage is (V – V ) when V falls to 0.1% below its
OUT
IN
OUT
nominal value at V = 1.8V.
IN
Note 8: Peak-to-Peak noise is measured with a single pole highpass filter
at 0.1Hz and a 2-pole lowpass filter at 10Hz. The unit is enclosed in a still
air environment to eliminate thermocouple effects on the leads. The test
time is 10 seconds.
Note 9: Hysteresis in the output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C, but the IC is
cycled to 85°C or –40°C before a successive measurement. Hysteresis is
roughly proportional to the square of the temperature change.
Note 4: If the part is stored outside of the specified temperature range, the
output voltage may shift due to hysteresis.
Note 5: ESD (Electrostatic Discharge) sensitive devices. Extensive use of
ESD protection devices are used internal to the LT6650; however, high
electrostatic discharge can damage or degrade the device. Use proper ESD
handling precautions.
Note 10: Temperature coefficient is measured by dividing the change in
output voltage by the specified temperature range.
Note 11: This feature guarantees the shunt mode operation of the device.
6650f
3
LT6650
U W
TYPICAL PERFOR A CE CHARACTERISTICS (See Applications, Figure 1)
Output Voltage Temperature
Drift
Output Voltage Temperature
Drift
Supply Current vs Input Voltage
404
403
402
401
400
399
398
397
396
403
402
401
400
399
398
10
8
TYPICAL PART
THREE PARTS
V
= 5V
IN
125°C
6
V
= 1.4V
IN
25°C
4
2
0
–55°C
V
= 18V
IN
V
= 5V
IN
–60 –40 –20
0
20 40 60 80 100 120
–60 –40 –20
0
20 40 60 80 100 120
0
2
4
6
8
10 12 14 16 18 20
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
6650 G01
6650 G02
6650 G03
Supply Current vs Input Voltage
Line Regulation
Line Regulation
10
8
404
403
402
401
400
399
398
404
403
402
401
400
399
398
125°C
T
A
= 125°C
6
25°C
T
= –55°C
A
–55°C
4
2
0
T
= –55°C
A
T
A
= 25°C
T
= 125°C
T
= 25°C
A
A
12 14
INPUT VOLTAGE (V)
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
2
4
6
8
10
16 18
0.8
1.0
1.2
1.4
1.6
1.8
2.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
6650 G04
6550 G05
6650 G06
Minimum Input-Output Voltage
Differential (Sourcing)
Load Regulation (Sourcing)
Load Regulation (Sinking)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
1000
900
800
700
600
500
400
300
200
100
0
500
400
300
200
100
0
TYPICAL PART
= 5V
TYPICAL PART
= 5V
V
= 1.425V - TYP (RF = 100k, RG = 39.2k)
OUT
OUT
V
V
IN
0.1% V
IN
25°C
125°C
125°C
25°C
–55°C
–55°C
25°C
125°C
–55°C
10
100
OUTPUT CURRENT (µA)
1000
10
100
OUTPUT CURRENT (µA)
1000
10
100
OUTPUT CURRENT (µA)
1000
6650 G07
6650 G08
6650 G09
6650f
4
LT6650
U W
TYPICAL PERFOR A CE CHARACTERISTICS (See Applications, Figure 1)
Minimum Input-Output Voltage
Differential (Sinking)
Output Short Circuit Current vs
Input Voltage
Output Short Circuit Current vs
Input Voltage
0
–100
–200
–300
–400
–500
14
12
10
8
14
12
10
8
V
= 1.425V - TYP (RF = 100k, RG = 39.2k)
OUT
OUTPUT SHORTED TO GND
OUTPUT SHORTED TO V
OUT
IN
0.1% V
25°C
125°C
–55°C
–55°C
25°C
125°C
25°C
6
6
4
4
–55°C
125°C
2
2
10
100
1000
0
2
4
6
8
10 12 14 16 18 20
0
2
4
6
8
10 12 14 16 18 20
OUTPUT CURRENT(µA)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
6650 G10
6650 G11
6650 G12
FB Pin Current vs FB Pin Voltage
FB Pin Current vs FB Pin Voltage
Gain and Phase vs Frequency
10
1
120
100
80
120
100
80
10
8
V
≠ V
OUT
V
≠ V
OUT
FB
FB
CURRENT IS POSITIVE WHEN
IT ENTERS THE DEVICE
CURRENT IS POSITIVE WHEN
IT ENTERS THE DEVICE
6
125°C
4
60
60
GAIN
125°C
2
PHASE
40
40
0
–2
–4
–6
–8
–10
20
20
0.1
0.01
0
0
T
= 25°C
–55°C
25°C
A
UNITY GAIN
25°C
–20
–40
–20
–40
R
C
= 2k
= 1µF
L
L
–55°C
0.4 0.6
–0.6 –0.4 –0.2
0
0.2
0.8 1.0
0.01
0.1
1
10
100
1
3
5
7
9
11 13 15 17 19
FB PIN VOLTAGE (V)
FREQUENCY (kHz)
FB PIN VOLTAGE (V)
6650 G14
6650 G15
6650 G13
Output Noise 0.1Hz to 10Hz
Output Voltage Noise Spectrum
Integrated Noise 10Hz to 1kHz
100
20
V
= 5V
V
C
= 5V
IN
V
C
= 5V
IN
= 1µF
IN
= 1µF
L
L
I
= –200µA
OUT
15
10
5
10
I
= –200µA
OUT
I
= 0µA
OUT
I
= –40µA
OUT
1
10
0
0
1
2
3
4
5
6
7
8
9
10
100
FREQUENCY (Hz)
1k
10
100
1k
10k
FREQUENCY (Hz)
TIME (s)
6650 G17
6650 G18
6650 G16
6650f
5
LT6650
U W
TYPICAL PERFOR A CE CHARACTERISTICS (See Applications, Figure 1)
Output Impedance vs Frequency
Output Impedance vs Frequency
Output Impedance vs Frequency
1000
100
10
1000
100
10
1000
100
10
I
= 0µA
I
= –40µA
I
= 0µA
L Z
OUT
Z
OUT
Z
OUT
R
= 0Ω
R
= 0Ω
C • R = 100µs
C
= 1µF
L
C
= 10µF
L
C
= 1µF
L
C
= 10µF
C
= 1µF
L
L
C
= 10µF
L
C
= 47µF
L
C
= 47µF
L
C
= 47µF
L
1
1
1
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
6650 G19
6650 G20
6650 G21
Power Supply Rejection Ratio vs
Frequency
Power Supply Rejection Ratio vs
Frequency
Power Supply Rejection Ratio vs
Frequency
20
10
20
10
20
10
I
= 0µA
I
= –40µA
I
= 0µA
Z
OUT
Z
OUT
= 0Ω
OUT
C • R = 100µs
L
R
= 0Ω
R
Z
C
= 10µF
L
0
0
0
C
= 1µF
L
C
= 10µF
C = 1µF
L
L
–10
–20
–30
–40
–50
–60
–70
–80
–10
–20
–30
–40
–50
–60
–70
–80
–10
–20
–30
–40
–50
–60
–70
–80
C
= 47µF
L
C
= 1µF
L
C
= 10µF
L
C
= 47µF
C = 47µF
L
L
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
6650 G22
6650 G23
6650 G24
Power Supply Rejection Ratio vs
Frequency
Power Supply Rejection Ratio vs
Frequency
Power Supply Rejection Ratio vs
Frequency
20
10
20
10
20
10
I
= 0µA
I
= –40µA
I
= 0µA
OUT
Z
IN
OUT
Z
IN
OUT
L
IN
R
= 0Ω
R
= 0Ω
C
C
• R = 100µs
Z
C
R
= 1µF
= 1k
C
R
= 1µF
= 1k
= 1µF
= 1k
0
0
0
R
IN
IN
IN
–10
–20
–30
–40
–50
–60
–70
–80
–10
–20
–30
–40
–50
–60
–70
–80
–10
–20
–30
–40
–50
–60
–70
–80
C
= 10µF
L
C
= 1µF
C
= 10µF
C = 10µF
L
L
L
C
= 1µF
L
C
= 1µF
L
C
= 47µF
L
C
= 47µF
L
C
= 47µF
L
10
100
1k
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
6650 G25
6650 G26
6650 G27
6650f
6
LT6650
U
U
U
PI FU CTIO S
FB (Pin 1): Resistor Divider Feedback Pin. Connect a
resistor divider from OUT to GND and the center tap to FB.
This pin sets the output potential.
IN(Pin4):PositiveSupply.Bypassingwitha1µFcapacitor
is recommended if the output loading changes.
OUT (Pin 5): Reference Output. The output sources and
sinks current. It is stable with any load capacitor with a
total capacitance of 1µF or more. Higher load capacitance
improves load transient response.
GND (Pin 2): Ground Connection.
DNC(Pin3):Donotconnect.Connectedinternallyforpost
package trim. This pin must be left unconnected.
W
BLOCK DIAGRA
IN
4
LT6650
V
= 400mV
R
+
REFERENCE
5
1
OUT
FB
–
DNC
3
2
6650 BD
GND
U
W U U
APPLICATIO S I FOR ATIO
Long Battery Life
functions. Output impedance can be reduced by DC load-
ing of the output by 40µA to 200µA, and/or adding an RZ
totheoutputcapacitorfora100µstimeconstantasshown
in Figure 1 and the Typical Performance Characteristics
graphs.
The LT6650 is a micropower, adjustable reference which
operates from supply voltages ranging from 1.4V to 18V.
The series regulated output may be configured with exter-
nal resistors to any voltage from 400mV to nearly the
supply potential. Under no-load conditions, the LT6650
dissipates only 8µW when operating on a 1.4V supply.
Other operating configurations allow the LT6650 to be
used as a micropower positive or negative adjustable
shunt reference from 1.4V to 18V.
The LT6650 Voltage reference should have an input by-
pass capacitor of 0.1µF or larger. When the circuit is
R
IN
IN
C
OUT
FB
V
IN
4
5
1
V
OUT
C
LT6650
2
IN
L
Bypass and Load Capacitor
R
Z
The LT6650 voltage reference requires a 1µF or greater
output capacitance for proper operation. This capacitance
may be provided by either a single capacitor connected
between OUT and GND or formed by the aggregate of
several capacitors that may be serving other decoupling
6650 F01
GND
Figure 1. LT6650 Input-Output Configuration
6650f
7
LT6650
U
W U U
APPLICATIO S I FOR ATIO
operated from a small battery or other relatively high
impedance source, a minimum 1µF capacitor is recom-
mended. PSRR can be significantly enhanced by adding a
low-pass RC filter on the input, with a time-constant of
1ms or higher, as shown in Figure 1. The Typical Perfor-
mance Characteristics graphs show performance as a
function of several combinations of input and output
capacitance.
the same circuit responding to input transients of 0.5V,
settling in about 0.3ms. Figures 5 through 7 show the
same circuit responding to various load steps: changes
between ±100µA in Figure 5; sourcing current step be-
tween –100µA and –200µA in Figure 6; and sinkingcurrent
VIN
3V
2.5V
An input RC of 100ms or more is recommended (such as
5k and 22µF) when output transients must be minimized
in the face of high supply noise, such as in automotive
applications. Figure 2 shows an input filter structure that
effectively eliminates supply transients from affecting the
output. With this extra input decoupling and the LT6650
operating normally from a 12V bus, 50V transients induce
less than <0.5% VOUT perturbations.
VOUT
0.4V
0V
2ms/DIV
6650 F04
Figure 4. Output Response to ±0.5V Input Step
Figure 3 shows the turn-on response time for the circuit in
Figure 1. The input voltage steps from 0V to 3V, and the
output is configured to produce 400mV. Input bypass and
output load capacitance are 1µF, RIN = 0Ω, RZ = 0Ω, and
the output settles in approximately 0.5ms. Figure 4 shows
VOUT
10mV/DIV
SINKING
SOURCING
IOUT
100µA
SINKING
NOISY
POWER BUS
100µA
SOURCING
33k
4.7k
V
IN
6650 F05
1N751
5V
1µF
22µF
Figure 5. Output Response to Bidirectional Load Step
6650 F02
(100µA to –100µA)
Figure 2. High Noise-Immunity Input Network
VOUT
10mV/DIV
VIN
3V
AC
IOUT
–100µA
–200µA
VOUT
0.4V
0V
0V
6650 F06
0.2ms/DIV
6650 F03
Figure 6. Output Response to Current-Sourcing Load Step
Figure 3. LT6650 Turn-On Characteristic
(–100µA to –200µA)
6650f
8
LT6650
U
W U U
APPLICATIO S I FOR ATIO
stepbetween100µAand200µAinFigure7.Loadstepsettling
contribution <0.15%). Since the VOUT error distribution
increases at twice the resistor tolerance, high accuracy
resistors or resistor networks are recommended. The
output voltage may be set to any level from 400mV up to
350mV below the supply voltage with source or sink
capability.
occurs in about 0.5ms or less (to ±0.2%).
Output Adjustment
If the LT6650 is to be used as a 400mV reference, then the
outputandfeedbackpinsmaybetiedtogetherwithoutany
scale-setting components as shown in the front-page
applicationcircuit.Settingtheoutputtoanyhighervoltage
is a simple matter of selecting two feedback resistors to
configurethenon-invertinggainoftheinternaloperational
amplifier, as shown in Figure 8. A feedback resistor RF is
connected between the OUT pin and the FB pin, and a gain
resistor RG is connected from the FB pin to GND. The
resistor values are related to the output voltage by the
following relationship:
Noise Reduction Capacitor
In applications involving the use of resistive feedback for
referencescaling, theintrinsicreferencenoiseisamplified
along with the DC level. To minimize noise amplification,
the use of a 1nF feedback capacitor is recommended, as
showninFigure8andothercircuitswithscalingresistors.
Shunt Reference Operation
The circuits shown in Figure 9 and Figure 10 form adjust-
ableshuntreferences.Alongwiththeexternalbiasresistor
RB, the LT6650 provides positive or negative reference
operation for outputs between 1.4V and 18V (positive or
negative). Just like a Zener diode, a supply VS is required,
somewhat higher in magnitude than the desired reference
RF = RG • (VOUT – 0.4)/(0.4 – IFB • RG)
The IFB term represents the FB pin bias current, and can
generally be neglected when RG is 100k or less. For
RG ≤ 20k, even worst-case IFB can be neglected (error
V
S
VOUT
10mV/DIV
AC
R
B
V
= 0.4V • (1 + R /R )
F G
OUT
V
OUT
1nF
4
5
R
R
F
IN
OUT
1
IOUT
10µF
FB
LT6650
GND
2
200µA
G
100µA
6650 F09
6650 F07
Figure 7. Output Response to Current-Sinking Load Step
Figure 9. Typical Configuration of LT6650 as Adjustable Positive
Shunt Reference
(100µA to 200µA)
1nF
4
5
V
= 0.4V • (1 + R /R )
F G
1k
OUT
R
R
F
IN
OUT
V
V
OUT
S
1
1nF
10µF
4
5
FB
LT6650
R
R
F
IN
OUT
GND
2
1
G
1µF
1µF
FB
LT6650
V
OUT
GND
2
G
V
= –0.4V • (1 + R /R )
F G
OUT
R
B
6650 F08
–V
S
6650 F10
Figure 8. Typical Configuration for Output Voltages
Greater than 0.4V
Figure 10. Typical Configuration of LT6650 as Adjustable
Negative Shunt Reference
6650f
9
LT6650
U
W U U
APPLICATIO S I FOR ATIO
VOUT. RB must be within the following range for proper
operation (the optimal value depends greatly on the direc-
tion and magnitude of the load current):
the parts cycled over the higher temperature extremes
exhibit a broader hysteresis distribution. The worst hys-
teresis measurements indicate voltage shifts of less than
1000ppm (0.1%) from their initial value.
RB > |VS – VOUT|/(200µA + 0.4/RG)
RB < |VS – VOUT|/(15µA + 0.4/RG)
Limits of Operation
The LT6650 is a robust bipolar technology part. ESD
clamp diodes are integrated into the design and are
depictedintheSimplifiedSchematicforreference. Diodes
are included between the GND pin and the IN, OUT, and FB
pins to prevent reverse voltage stress on the device.
Unusual modes of operation that forward-bias any these
diodes should limit current to 10mA to avoid permanent
damage to the device. The LT6650 is fabricated using a
relatively high-voltage process, allowing any pin to inde-
pendently operate at up to 20V with respect to GND. The
part does not include any over voltage protection mecha-
nisms; therefore caution should be exercised to avoid
inadvertent application of higher voltages in circuits in-
volving high potentials.
Hysteresis
Due to various mechanical stress mechanisms inherent to
integrated-circuit packaging, internal offsets may not pre-
cisely recover from variations that occur over tempera-
ture,andthiseffectisreferredtoashysteresis.Proprietary
manufacturing steps minimize this hysteresis, though
some small residual error can occur. Hysteresis measure-
ments for the LT6650 can be seen in Figures 11 and 12.
Figure 11 presents the worst-case data taken on parts
subjected to thermal cycling between 0°C to 70°C, while
Figure 12 shows data for –40°C to 85°C cycling. Units
were cycled several times over these temperature ranges
andthelargestchangesareshown. Aswouldbeexpected,
6
7
LIGHT COLUMNS 0°C TO 25°C
DARK COLUMNS 70°C TO 25°C
LIGHT COLUMNS –40°C TO 25°C
DARK COLUMNS 85°C TO 25°C
6
5
5
4
3
2
1
0
4
3
2
1
0
–400
–200
0
200
400
600
–1000–750 –500 –250
0
250 500 750 1000
DISTRIBUTION (ppm)
DISTRIBUTION (ppm)
6650 F11
6650 F12
Figure 11. Worst-Case 0°C to 70°C Hysteresis
Figure 12. Worst-Case –40°C to 85°C Hysteresis
6650f
10
LT6650
W
W
SI PLIFIED SCHE ATIC
5
IN
IN
IN
4
OUT
IN
2
GND
FB
1
6650 SS
U
PACKAGE DESCRIPTIO
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 TSOT-23 0302
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
6650f
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT6650
U
TYPICAL APPLICATIO
Adjustable Micropower “Zener” 2-Terminal Reference
CATHODE
CATHODE
1nF
4
5
R
R
F
IN
OUT
FB
1
1.4V ≤ V ≤ 18V
Z
10µF
LT6650
=
30µA ≤ I ≤ 220µA
Z
V
= 0.4V • (1 + R /R )
GND
2
Z
F
G
G
ANODE
ANODE
6650 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1790
Micropower LDO Precision Reference
Micropower Precision Reference
0.05% Max Sources/Sinks-Current Available in SOT-23
0.075% Max 10ppm/ºC Available in SOT-23
0.04% Max 3ppm/ºC 35µA Supply Current
LT1460
LT1461
Micropower LDO Low TC Precision Reference
Single/Dual/Quad Micropower Op Amps
LT1494/LT1495/
LT1496
1.5µA, V < 375µV, I < 1000pA
OS B
LTC1540
LTC1798
LT6700
Nanopower Comparator with Reference
Micropower LDO Reference
300nA, Available in 3mm × 3mm DFN Package
0.15% Max 6.5µA Supply Current
Micropower Dual Comparator with Reference
6.5µA, Choice of Polarities Available in SOT-23
6650f
LT/TP 0504 1K • PRINTED IN USA
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2003
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