View LT6650_321344.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LT6650 Micropower, 400mV Reference with Rail-to-Rail Buffer Amplifier in SOT-23
FEATURES
s s s
DESCRIPTIO
s s s s s s s
Low Quiescent Current 5.6A (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 Wide Operational Range -40C to 125C Externally Adjustable Output Voltage Low Profile 1mm 5-lead SOT-23 (ThinSOTTM) Package
The LT(R)6650 is a micropower, low voltage 400mV reference. Operating with supplies from 1.4V up to 18V, the device draws only 5.6A 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. The reference is postpackage-trimmed to increase the output accuracy. The output can sink and source 200A over temperature. Quiescent power dissipation is 28W. Stability is ensured with any output capacitor of 1F or higher. The LT6650 is the lowest voltage series reference available in the 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.
APPLICATIO S
s s s s s
Battery-Operated Systems Handheld Instruments Industrial Control Systems Data Acquisition Systems Negative Voltage References
TYPICAL APPLICATIO
VIN = 1.4V TO 18V IQ 6A
Battery-Powered 0.4V Reference
402
LT6650 Temperature Drift
TYPICAL LT6650 PART VIN = 5V NO LOAD SINK 200A 400 SOURCE -200A 399
REFERENCE VOLTAGE (mV)
4 IN VR = 400mV REFERENCE LT6650
401
+ -
OUT 5 VOUT 0.4V
GND 1F 2
FB 1 1F
398 -50 -30 -10 10 30 50 70 90 110 130 TEMPERATURE (C)
6650 TA01b
6650 TA01a
U
6650f
U
U
1
LT6650
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART NUMBER
TOP VIEW FB 1 GND 2 DNC* 3 4 IN 5 OUT
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 ............... -40C to 125C Specified Temperature Range LT6650CS5 ............................................. 0C to 70C LT6650IS5 ........................................... -40C to 85C LT6650HS5 (Note 3) ......................... -40C to 125C Maximum Junction Temperature .......................... 150C Storage Temperature Range (Note 4) ............................................. -65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
LT6650CS5 LT6650IS5 LT6650HS5 S5 PART MARKING LBDV
S5 PACKAGE 5-LEAD PLASTIC TSOT-23
TJMAX = 150C, JA = 230C/W
*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.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 5V, CIN = 1F, FB = OUT, no DC load, CL = 1F, unless otherwise noted.
SYMBOL VOUT PARAMETER Output Voltage (Notes 4, 5) CONDITIONS LT6650 LT6650CS5 LT6650IS5 LT6650HS5 VIN VOUT/VIN Operating Input Voltage Line Regulation 1.4V VIN 18V 1 150 LT6650CS5, LT6650IS5 LT6650HS5 VOUT/IOUT Load Regulation (Note 6) Sourcing from 0A to -200A
q q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN 398 -0.5 397 -0.75 396 -1 394 -1.5 1.4
TYP 400 400 400 400
MAX 402 0.5 403 0.75 404 1 406 1.5 18 6 900 7.5 1130 8.5 1280
UNITS mV % mV % mV % mV % V mV ppm/V mV ppm/V mV ppm/V mV ppm/mA mV ppm/mA mV ppm/mA mV ppm/mA ppm/C
6650f
-0.04 500
-0.2 2500 -0.4 5000 1 12500 2 20000
Sinking from 0A to 200A
q q
0.24 3000
TC
Output Voltage Temperature Coefficient (Note 10)
q
30
2
U
W
U
U
WW
W
LT6650
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 5V, CIN = 1F, FB = OUT, no DC load, CL = 1F, unless otherwise noted.
SYMBOL VDO PARAMETER Dropout Voltage (Note 7) CONDITIONS Referred to VIN = 1.8V, VOUT = 1.4V (RF = 100k, RG = 39.2k) VOUT = -0.1%, IOUT = 0A
q
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX
UNITS
75 165
q
100 150 250 350 -150 0
mV mV mV mV mV mV mA mA
VOUT = -0.1%, IOUT = -200A Sourcing VOUT = -0.1%, IOUT = 200A Sinking (Note 11)
q
-300 5 9 5.6
q
ISC IIN
Short-Circuit Output Current Supply Current
VOUT Shorted to GND VOUT Shorted to VIN
11 14 12 15 10 15 30
A A A A nA nA nA ms VP-P VRMS mV ppm mV ppm
VIN = 18V
q
5.9
IFB
FB Pin Input Current
VFB = VOUT = 400mV 1.2 LT6650CS5, LT6650IS5 LT6650HS5
q q
TON en VHYS
Turn-On Time Output Noise (Note 8) Hysteresis (Note 9)
CLOAD = 1F 0.1Hz 10Hz 10Hz 1KHz, IOUT = -200A Sourcing T = 0C to 70C T = -40C to 85C
q q q q
0.5 20 23 0.1 250 0.24 600
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 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 85C, it is recommended to enhance the stability margin by using an output capacitor greater than 10F or a series RC combination having a 100s equivalent time constant. See Application section for details. 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 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 7: Dropout Voltage is (VIN - VOUT) when VOUT falls to 0.1% below its nominal value at VIN = 1.8V. 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 25C, but the IC is cycled to 85C or -40C before a successive measurement. Hysteresis is roughly proportional to the square of the temperature change. 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 TYPICAL PERFOR A CE CHARACTERISTICS
Output Voltage Temperature Drift
404 403 402 OUTPUT VOLTAGE (mV) OUTPUT VOLTAGE (mV) 401 400 399 VIN = 18V 398 397 396 -60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
6650 G01
TYPICAL PART
SUPPLY CURRENT (A)
402 VIN = 1.4V
VIN = 5V
Supply Current vs Input Voltage
10 125C
OUTPUT VOLTAGE (mV)
8
402 TA = 125C 401 400 399 398 TA = -55C TA = 25C
OUTPUT VOLTAGE (mV)
SUPPLY CURRENT (A)
6
25C -55C
4
2
0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 INPUT VOLTAGE (V)
6650 G04
Load Regulation (Sourcing)
0 -10 OUTPUT VOLTAGE CHANGE (V) -20 -30 -40 -50 -60 -70 -80 -90 -100 10 100 OUTPUT CURRENT (A) 1000
6650 G07
TYPICAL PART VIN = 5V OUTPUT VOLTAGE CHANGE (V) 25C 125C -55C
800 700 600 500 400 300 200 100 0 10 100 OUTPUT CURRENT (A) 1000
6650 G08
INPUT-OUTPUT VOLTAGE (mV)
4
UW
(See Applications, Figure 1)
Output Voltage Temperature Drift
403 THREE PARTS VIN = 5V 10
Supply Current vs Input Voltage
8
125C
401
6 25C 4 -55C 2
400
399
398 -60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
6650 G02
0
0
2
4
6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
6650 G03
Line Regulation
404 403 404 403 402 401 400 399
Line Regulation
TA = -55C TA = 25C TA = 125C
2
4
6
10 12 14 8 INPUT VOLTAGE (V)
16
18
398 0.8
1.0
1.4 1.2 1.6 INPUT VOLTAGE (V)
1.8
2.0
6650 G06
6550 G05
Load Regulation (Sinking)
1000 900 TYPICAL PART VIN = 5V 500
Minimum Input-Output Voltage Differential (Sourcing)
VOUT = 1.425V - TYP (RF = 100k, RG = 39.2k) 0.1% VOUT
400 125C 300 25C -55C
-55C 25C 125C
200
100
0 10 100 OUTPUT CURRENT (A) 1000
6650 G09
6650f
LT6650 TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Input-Output Voltage Differential (Sinking)
0
INPUT-OUTPUT VOLTAGE (mV)
VOUT = 1.425V - TYP (RF = 100k, RG = 39.2k) 0.1% VOUT
OUTPUT CURRENT (mA)
-100 -55C -200 25C
10 8 6 4 125C 25C
OUTPUT CURRENT (mA)
-300
-400 125C -500 10 100 OUTPUT CURRENT(A) 1000
6650 G10
FB Pin Current vs FB Pin Voltage
10 VFB VOUT 8 CURRENT IS POSITIVE WHEN IT ENTERS THE DEVICE 6 FB PIN CURRENT (nA)
FB PIN CURRENT (nA)
4 2 0 -2 -4 -6 -8 -55C 125C
GAIN (dB)
25C 0.8 1.0
-10 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 FB PIN VOLTAGE (V)
Output Noise 0.1Hz to 10Hz
VIN = 5V
NOISE LEVEL (V/Hz)
15
INTEGRATED NOISE (VRMS)
OUTPUT NOISE (5V/DIV)
0
1
2
3
456 TIME (s)
7
UW
6650 G13
(See Applications, Figure 1) Output Short Circuit Current vs Input Voltage
14 12 25C 10 8 6 4 2 125C -55C OUTPUT SHORTED TO VIN
Output Short Circuit Current vs Input Voltage
14 12 OUTPUT SHORTED TO GND
-55C
2
0
2
4
6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
6650 G11
0
2
4
6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
6650 G12
FB Pin Current vs FB Pin Voltage
10 VFB VOUT CURRENT IS POSITIVE WHEN IT ENTERS THE DEVICE 125C 1
120 100 80 60 40 20
Gain and Phase vs Frequency
120 100 80 GAIN PHASE 60 40 20 0 -20 1 10 FREQUENCY (kHz) -40 100
6650 G15
PHASE (DEG)
0.1 25C 0.01 1 3 5 -55C 7 9 11 13 15 FB PIN VOLTAGE (V) 17 19
0 T = 25C A UNITY GAIN -20 R = 2k L CL = 1F -40 0.1 0.01
6650 G14
Output Voltage Noise Spectrum
20 VIN = 5V CL = 1F
100
Integrated Noise 10Hz to 1kHz
VIN = 5V CL = 1F IOUT = -200A
10 IOUT = 0A 5 IOUT = -40A 0 IOUT = -200A
10
8
9
10
10
100 1k FREQUENCY (Hz)
10k
6650 G17
1 10
100 FREQUENCY (Hz)
1k
6650 G18
6650 G16
6650f
5
LT6650 TYPICAL PERFOR A CE CHARACTERISTICS
Output Impedance vs Frequency
1000 IOUT = 0A RZ = 0 CL = 10F 100 CL = 1F 1000
OUTPUT IMPEDANCE ()
OUTPUT IMPEDANCE ()
100 CL = 10F CL = 47F 10 CL = 1F
OUTPUT IMPEDANCE ()
10
CL = 47F
1 10 100 1k 10k FREQUENCY (Hz) 100k
6650 G19
Power Supply Rejection Ratio vs Frequency
20
POWER SUPPLY REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
0 -10 -20 -30 -40 -50 -60 -70 -80 10 100 1k 10k FREQUENCY (Hz) 100k
6650 G22
0 -10 -20 -30 -40 -50 -60 -70 -80 10 100
CL = 10F CL = 1F
POWER SUPPLY REJECTION RATIO (dB)
IOUT = 0A 10 RZ = 0 CL = 10F CL = 1F
CL = 47F
Power Supply Rejection Ratio vs Frequency
POWER SUPPLY REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
CL = 1F
-20 -30 -40 -50 -60 -70 -80 10 100 CL = 47F
POWER SUPPLY REJECTION RATIO (dB)
IOUT = 0A 10 RZ = 0 C = 1F 0 RIN = 1k IN -10 CL = 10F -20 -30 -40 -50 -60 -70 -80 10 100 CL = 47F
20
1k 10k FREQUENCY (Hz)
6
UW
6650 G25
(See Applications, Figure 1)
Output Impedance vs Frequency
IOUT = -40A RZ = 0 1000
Output Impedance vs Frequency
IOUT = 0A CL * RZ = 100s CL = 1F 100 CL = 10F 10 CL = 47F
1 10 100 1k 10k FREQUENCY (Hz) 100k
6650 G20
1 10 100 1k 10k FREQUENCY (Hz) 100k
6650 G21
Power Supply Rejection Ratio vs Frequency
20 IOUT = -40A 10 RZ = 0 20
Power Supply Rejection Ratio vs Frequency
IOUT = 0A 10 CL * RZ = 100s 0 -10 -20 -30 -40 -50 -60 -70 -80 10 100 1k 10k FREQUENCY (Hz) 100k
6650 G24
CL = 47F
CL = 1F
CL = 10F CL = 47F
1k 10k FREQUENCY (Hz)
100k
6650 G23
Power Supply Rejection Ratio vs Frequency
IOUT = -40A 10 RZ = 0 C = 1F 0 RIN = 1k IN -10 CL = 10F 20 20
Power Supply Rejection Ratio vs Frequency
IOUT = 0A 10 CL * RZ = 100s C = 1F 0 RIN = 1k IN -10 -20 -30 -40 -50 -60 -70 -80 10 100 1k 10k FREQUENCY (Hz) 100k
6650 G27
CL = 10F
CL = 1F
CL = 1F
CL = 47F
100k
1k 10k FREQUENCY (Hz)
100k
6650 G26
6650f
LT6650
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. GND (Pin 2): Ground Connection. DNC (Pin 3): Do not connect. Connected internally for post package trim. This pin must be left unconnected. IN (Pin 4): Positive Supply. Bypassing with a 1F capacitor 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 1F or more. Higher load capacitance improves load transient response.
BLOCK DIAGRA
APPLICATIO S I FOR ATIO
Long Battery Life
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 external resistors to any voltage from 400mV to nearly the supply potential. Under no-load conditions, the LT6650 dissipates only 8W 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. Bypass and Load Capacitor The LT6650 voltage reference requires a 1F 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
U
W
W
U
U
U
U
U
IN 4
LT6650
VR = 400mV REFERENCE
+
5 OUT
DNC 3
-
1 FB 2 GND
6650 BD
functions. Output impedance can be reduced by DC loading of the output by 40A to 200A, and/or adding an RZ to the output capacitor for a 100s time constant as shown in Figure 1 and the Typical Performance Characteristics graphs. The LT6650 Voltage reference should have an input bypass capacitor of 0.1F or larger. When the circuit is
RIN VIN IN OUT
4 LT6650
5
VOUT CL
CIN
1 2 GND
6650 F01
FB RZ
Figure 1. LT6650 Input-Output Configuration
6650f
7
LT6650
APPLICATIO S I FOR ATIO
operated from a small battery or other relatively high impedance source, a minimum 1F capacitor is recommended. 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 Performance Characteristics graphs show performance as a function of several combinations of input and output capacitance. An input RC of 100ms or more is recommended (such as 5k and 22F) 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. 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 1F, RIN = 0, RZ = 0, and the output settles in approximately 0.5ms. Figure 4 shows
NOISY POWER BUS 33k
4.7k VIN 1N751 5V
6650 F02
1F
22F
Figure 2. High Noise-Immunity Input Network
VOUT 10mV/DIV AC
VIN 3V
0V 0.2ms/DIV
6650 F03
Figure 3. LT6650 Turn-On Characteristic
8
U
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 100A in Figure 5; sourcing current step between -100A and -200A in Figure 6; and sinking current
VIN 3V 2.5V VOUT 0.4V 0V 2ms/DIV
6650 F04
W
U
U
Figure 4. Output Response to 0.5V Input Step
VOUT 10mV/DIV SINKING SOURCING
IOUT 100A SINKING 100A SOURCING
6650 F05
Figure 5. Output Response to Bidirectional Load Step (100A to -100A)
IOUT -100A VOUT 0.4V 0V
6650 F06
-200A
Figure 6. Output Response to Current-Sourcing Load Step (-100A to -200A)
6650f
LT6650
APPLICATIO S I FOR ATIO
step between 100A and 200A in Figure 7. Load step settling 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 output and feedback pins may be tied together without any scale-setting components as shown in the front-page application circuit. Setting the output to any higher voltage is a simple matter of selecting two feedback resistors to configure the non-inverting gain of the internal operational 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: 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
VOUT 10mV/DIV AC
IOUT 200A 100A
6650 F07
Figure 7. Output Response to Current-Sinking Load Step (100A to 200A)
1k VS 4 IN 1F GND 2 LT6650 5 OUT FB 1
VOUT = 0.4V * (1 + RF/RG) 1nF RF 1F RG VOUT
6650 F08
Figure 8. Typical Configuration for Output Voltages Greater than 0.4V
U
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. Noise Reduction Capacitor In applications involving the use of resistive feedback for reference scaling, the intrinsic reference noise is amplified along with the DC level. To minimize noise amplification, the use of a 1nF feedback capacitor is recommended, as shown in Figure 8 and other circuits with scaling resistors. Shunt Reference Operation The circuits shown in Figure 9 and Figure 10 form adjustable shunt references. Along with the external bias resistor 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
VS RB 4 IN GND 2 LT6650 5 OUT FB 1 RG
6650 F09
W
U
U
VOUT = 0.4V * (1 + RF/RG) 1nF RF 10F VOUT
Figure 9. Typical Configuration of LT6650 as Adjustable Positive Shunt Reference
4 IN GND 2 RB -VS LT6650
5 OUT FB 1
1nF RF 10F RG VOUT VOUT = -0.4V * (1 + RF/RG)
6650 F10
Figure 10. Typical Configuration of LT6650 as Adjustable Negative Shunt Reference
6650f
9
LT6650
APPLICATIO S I FOR ATIO
VOUT. RB must be within the following range for proper operation (the optimal value depends greatly on the direction and magnitude of the load current): RB > |VS - VOUT|/(200A + 0.4/RG) RB < |VS - VOUT|/(15A + 0.4/RG) Hysteresis Due to various mechanical stress mechanisms inherent to integrated-circuit packaging, internal offsets may not precisely recover from variations that occur over temperature, and this effect is referred to as hysteresis. Proprietary manufacturing steps minimize this hysteresis, though some small residual error can occur. Hysteresis measurements 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 0C to 70C, while Figure 12 shows data for -40C to 85C cycling. Units were cycled several times over these temperature ranges and the largest changes are shown. As would be expected,
6 5
NUMBER OF UNITS
LIGHT COLUMNS 0C TO 25C DARK COLUMNS 70C TO 25C
4 3 2 1 0 -400
NUMBER OF UNITS
-200
200 400 0 DISTRIBUTION (ppm)
600
6650 F11
Figure 11. Worst-Case 0C to 70C Hysteresis
10
U
the parts cycled over the higher temperature extremes exhibit a broader hysteresis distribution. The worst hysteresis measurements indicate voltage shifts of less than 1000ppm (0.1%) from their initial value. Limits of Operation The LT6650 is a robust bipolar technology part. ESD clamp diodes are integrated into the design and are depicted in the Simplified Schematic for reference. 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 independently operate at up to 20V with respect to GND. The part does not include any over voltage protection mechanisms; therefore caution should be exercised to avoid inadvertent application of higher voltages in circuits involving high potentials.
7 6 5 4 3 2 1 0 -1000 -750 -500 -250 0 250 500 750 1000 DISTRIBUTION (ppm)
6650 F12
W
U
U
LIGHT COLUMNS -40C TO 25C DARK COLUMNS 85C TO 25C
Figure 12. Worst-Case -40C to 85C Hysteresis
6650f
LT6650
SI PLIFIED SCHE ATIC
5 IN
PACKAGE DESCRIPTIO
0.62 MAX
3.85 MAX 2.62 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.20 BSC 1.00 MAX 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
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.
U
W
W
IN
IN
4 OUT
IN
2 GND
1 FB
6650 SS
S5 Package 5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.95 REF 2.90 BSC (NOTE 4)
1.22 REF
1.4 MIN
2.80 BSC
1.50 - 1.75 (NOTE 4)
PIN ONE 0.30 - 0.45 TYP 5 PLCS (NOTE 3)
0.95 BSC
0.80 - 0.90 0.01 - 0.10
1.90 BSC
S5 TSOT-23 0302
6650f
11
LT6650
TYPICAL APPLICATIO
4 IN GND 2 LT6650
OUT FB
RELATED PARTS
PART NUMBER LT1790 LT1460 LT1461 LT1494/LT1495/ LT1496 LTC1540 LTC1798 LT6700 DESCRIPTION Micropower LDO Precision Reference Micropower Precision Reference Micropower LDO Low TC Precision Reference Single/Dual/Quad Micropower Op Amps Nanopower Comparator with Reference Micropower LDO Reference Micropower Dual Comparator with Reference COMMENTS 0.05% Max Sources/Sinks-Current Available in SOT-23 0.075% Max 10ppm/C Available in SOT-23 0.04% Max 3ppm/C 35A Supply Current 1.5A, VOS < 375V, IB < 1000pA 300nA, Available in 3mm x 3mm DFN Package 0.15% Max 6.5A Supply Current 6.5A, Choice of Polarities Available in SOT-23
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
U
Adjustable Micropower "Zener" 2-Terminal Reference
CATHODE 5 1 RG ANODE
6650 TA02
CATHODE
1nF RF 10F
=
1.4V VZ 18V 30A IZ 220A VZ = 0.4V * (1 + RF/RG) ANODE
6650f LT/TP 0504 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2003

▲Up To Search▲

Price & Availability of LT6650

	To Download LT6650 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .