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LTC1798CS8-5#TRPBF [Linear]

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LTC1798CS8-5#TRPBF
型号： LTC1798CS8-5#TRPBF
厂家： Linear    Linear
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LTC1798 Series  
Micropower Low  
Dropout References  
U
DESCRIPTIO  
FEATURES  
The LTC®1798/LTC1798-2.5/LTC1798-3/LTC1798-4.1/  
LTC1798-5aremicropowerbandgapreferencesthatcom-  
bine high accuracy and low drift with very low supply  
currentandsmallpackagesize.Thecombinationofultralow  
quiescent current and low dropout voltage of only 200mV  
(max) makes them ideal for battery-powered equipment.  
The output voltage is set by an external resistor divider for  
the adjustable LTC1798.  
■
200mV Max Dropout at 10mA Output Current  
■
4µA Typical Quiescent Current  
■
0.15% Max Initial Accuracy  
■
No Output Capacitor Required  
■
Output Sources 10mA, Sinks 2mA  
■
40ppm/°C Max Drift  
■
Voltage Options: 2.5V, 3V, 4.1V, 5V and Adjustable  
U
This series of references uses curvature compensation to  
obtain low temperature coefficient and trimmed thin-film  
resistors to achieve high output accuracy. These refer-  
ences can source up to 10mA and sink up to 2mA, making  
them ideal for precision regulator applications. They are  
stable without an output bypass capacitor, but are also  
stablewithcapacitanceupto1µF.Thisfeatureisimportant  
incriticalapplicationswherePCboardspaceisapremium  
and fast settling is demanded.  
APPLICATIO S  
■
Battery-Powered Systems  
■
Handheld Instruments  
■
Precision Power Supplies  
A/D and D/A Converters  
■
The LTC1798 series references provided power dissipa-  
tion advantages over shunt references. In addition to  
supply current, shunt references must also idle the entire  
load current to operate.  
The LTC1798 series is available in the SO-8 package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
LTC1798-2.5 Temperature Drift  
4
2.5V Battery-Powered Reference  
3
2
LTC1798-2.5  
6
2
2.7V  
TO 12.6V  
IN  
2.5V  
OUT  
1
0.1µF  
0
GND  
4
1798 TA01  
–1  
–2  
–3  
–4  
–40 –20  
0
20  
40  
60  
80 100  
TEMPERATURE (°C)  
1798 TA02  
1
LTC1798 Series  
W W  
U W  
U
W
U
ABSOLUTE AXI U RATI GS  
PACKAGE/ORDER I FOR ATIO  
(Note 1)  
ORDER PART  
Supply Voltage ....................................................... 13V  
Input Voltages .......................................... –0.3v to 13V  
Output Voltages ........................................ –0.3V to 13V  
Output Short-Circuit Duration.......................... Indefinite  
Operating Temperature Range  
(Note 2) ........................................... –40°C to 100°C  
Specified Temperature Range..................... 0°C to 70°C  
Storage Temperature Range (Note 3) ... –65°C to 150°C  
Lead Temperature (Soldering, 10 sec)................. 300°C  
NUMBER  
TOP VIEW  
*DNC  
IN  
1
2
3
4
8
7
6
5
DNC*  
DNC*  
OUT  
LTC1798CS8  
LTC1798CS8-2.5  
LTC1798CS8-3  
LTC1798CS8-4.1  
LTC1798CS8-5  
**DNC/FB  
GND  
DNC*  
S8 PACKAGE  
8-LEAD PLASTIC SO  
S8 PART MARKING  
TJMAX = 125°C, θJA = 190°C/W  
1798  
* CONNECTED INTERNALLY. DO NOT  
CONNECT EXTERNAL CIRCUITRY TO  
THESE PINS  
** DNC FOR LTC1798-2.5/LTC1798-3/  
LTC1798-4.1/LTC1798-5, FB FOR LTC1798  
179825  
17983  
179841  
17985  
Consult factory for parts specified with wider operating temperature range.  
U
AVAILABLE OPTIO S  
PACKAGE TYPE  
SO-8 (S8)  
OUTPUT  
VOLTAGE  
(V)  
TEMPERATURE  
RANGE  
TEMPERATURE  
COEFFICIENT  
(ppm/°C)  
ACCURACY  
(%)  
(°C)  
ORDER NUMBER  
LTC1798CS8-2.5  
LTC1798CS8-3  
LTC1798CS8-4.1  
LTC1798CS8-5  
LTC1798CS8  
PART MARKING  
179825  
17983  
2.5  
0 to 70  
0 to 70  
0 to 70  
0 to 70  
0 to 70  
0.15  
0.15  
0.15  
0.15  
0.4  
40  
40  
40  
40  
40  
3
4.096  
5
179841  
17985  
Adjustable  
1798  
ELECTRICAL CHARACTERISTICS  
The ● denotes specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C.  
VIN = VOUT(NOMINAL) + 0.2V, IOUT = 0mA unless otherwise noted. FB = OUT for the LTC1798.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
V
Input Voltage Range  
Input Current  
●
●
12.6  
V
IN  
I
FB = OUT for LTC1798  
4.0  
6.5  
8.5  
µA  
µA  
IN  
V
Output Voltage (Note 4)  
LTC1798, FB = OUT  
LTC1798 ADJ  
LTC1798-2.5  
LTC1798-3  
LTC1798-4.1  
2.3755  
– 0.4  
2.4963  
2.9955  
4.090  
2.385  
2.3945  
0.4  
2.5037  
3.0045  
4.102  
5.0075  
0.15  
V
%
V
V
V
OUT  
2.5  
3
4.096  
5
LTC1798-5  
LTC1798 All Fixed Options  
4.9925  
–0.15  
V
%
2
LTC1798 Series  
ELECTRICAL CHARACTERISTICS  
The ● denotes specifications which apply over the full specified temperature range, otherwise specifications are at TA = 25°C.  
VIN = VOUT(NOMINAL) + 0.2V, IOUT = 0mA unless otherwise noted. FB = OUT for the LTC1798.  
SYMBOL  
PARAMETER  
CONDITIONS  
MIN  
TYP  
8
MAX  
UNITS  
ppm  
e
Output Voltage Noise (Note 5)  
Output Voltage Temp Coefficient (Note 6)  
Line Regulation  
0.1Hz ≤ f ≤ 10Hz  
n
P-P  
TC  
T
≤ T ≤ T  
●
●
●
15  
40  
120  
0.3  
ppm/°C  
ppm/V  
mV/mA  
MIN  
J
MAX  
V
V
/V  
V
= (V  
IN  
+ 0.2V) to 12.6V  
30  
OUT IN  
OUT(NOMINAL)  
/I  
Load Regulation (Note 7)  
Sourcing 0mA to 10mA  
Sinking 0mA to 2mA  
0.1  
1.75  
OUT OUT  
4.0  
6.5  
mV/mA  
mV/mA  
●
I
Short-Circuit Output Current  
Dropout Voltage (Note 8)  
Output Hysteresis (Note 9)  
FB Pin Input Current  
V
V
Shorted to GND  
20  
2
40  
4
mA  
mA  
SC  
OUT  
OUT  
Shorted to V  
IN  
∆V  
I
I
= 0, ∆V ≤ 0.1%  
OUT  
●
●
100  
200  
mV  
mV  
DO  
OUT  
OUT  
= 10mA, ∆V  
≤ 0.1%  
OUT  
V
∆T = –40°C to 85°C  
∆T = 0°C to 70°C  
200  
50  
ppm  
ppm  
HYST  
I
LTC1798, OUT = FB  
10  
nA  
FB  
Note 6: Temperature coefficient is the change in output voltage divided by  
the nominal output voltage divided by the specified temperature range.  
Note 1: Absolute Maximum Ratings are those values beyond which the life  
of the device may be impaired.  
Note 7: 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 LTC1798 is guaranteed functional over the operating  
temperature range of –40°C to 100°C.  
Note 3: If the part is stored outside of the specified operating temperature  
Note 8: Dropout voltage is (V – V ) when V falls to 0.1% below its  
range, the output may shift due to hysteresis.  
IN  
OUT  
OUT  
nominal value at V = V  
+ 0.5V.  
IN  
OUT  
Note 4: ESD (Electostatic Discharge) sensitive device. Extensive use of  
ESD protection devices are used internal to the LTC1798, however, high  
electrostatic discharge can damage or degrade the device. Use proper ESD  
handling precautions.  
Note 5: Peak-to-peak noise is measured with a single pole highpass filter  
at 0.1Hz and 2-pole lowpass filter at 10Hz.  
Note 9: Hysteresis in 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 hot or cold before successive measurements. Hysteresis is not  
normally a problem for operational temperature excursions where the  
instrument might be stored at high or low temperature.  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
LTC1798-2.5* Dropout Voltage  
vs Output Source Current  
LTC1798-2.5*  
Input Current vs Temperature  
LTC1798 Series Output Short-  
Circuit Current vs Temperature  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
8
7
6
5
4
3
2
1
0
70  
60  
50  
40  
30  
20  
10  
5
V
= 2.7V  
T
V
= 25°C  
A
OUTPUT  
SHORTED  
TO GND  
T
A
= 25°C  
IN  
= V  
+ 0.2V  
IN  
OUT(NOM)  
OUTPUT  
SHORTED  
TO V  
IN  
0
0
0.1  
1
10  
100  
–50 –25  
0
25 50 75 100 125 150  
TEMPERATURE (°C)  
1798 G02  
–50 –25  
0
25 50 75 100 125 150  
TEMPERATURE (°C)  
1798 G03  
OUTPUT SOURCE CURRENT (mA)  
1798 G01  
*Similar performance characteristics can be expected for all voltage options.  
3
LTC1798 Series  
U W  
TYPICAL PERFOR A CE CHARACTERISTICS  
LTC1798-2.5* Output Short-Circuit  
Current vs Input Voltage  
LTC1798-2.5* Output Short-Circuit  
Current vs Input Voltage  
LTC1798 Series  
Load Regulation  
25  
20  
15  
10  
5
42  
5
4
T = 25°C  
A
T
= 25°C  
A
V
= V  
+ 0.2V  
OUTPUT SHORTED  
IN  
OUT(NOM)  
TO V  
3
IN  
SINKING  
2
1
SOURCING  
0
–1  
–2  
–3  
–4  
–5  
T
= 25°C  
A
OUTPUT SHORTED  
TO GND  
0
41  
2
6
8
10  
12  
14  
2
6
8
10  
12  
14  
0
0.1  
1
10  
100  
4
4
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
OUTPUT CURRENT (mA)  
1798 G06  
1258-G04  
1798 G05  
LTC1798-2.5*  
Output Voltage vs Input Voltage  
LTC1798-2.5*  
Input Current vs Input Voltage  
LTC1798-2.5 PSRR vs Frequency  
2.5010  
2.5005  
2.5000  
2.4995  
7
60  
50  
40  
30  
20  
10  
0
T
= 25°C  
T
= 25°C  
A
V
IN  
= 2.7V  
A
6
5
4
2
6
8
10  
12  
14  
2
6
8
10  
12  
14  
4
4
10  
100  
1k  
10k  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
FREQUENCY (Hz)  
1798 G09  
1798 G07  
1798 G08  
LTC1798-5 Input Current vs Input  
Voltage in Dropout  
LTC1798-2.5 Input Current vs Input  
Voltage in Dropout  
LTC1798-2.5 0.1Hz to 10Hz Noise  
1400  
1200  
1000  
800  
600  
400  
200  
0
250  
200  
150  
100  
50  
V
IN  
= 2.7V  
T
= –55°C  
A
T
T
= 25°C  
A
T
T
= 25°C  
A
A
T
= 125°C  
A
= 125°C  
A
5µV/DIV  
= –55°C  
0
1SEC/DIV  
0
1
2
3
4
5
6
7
8
9
10  
0
0.5  
1
1.5  
2
2.5  
3
3.5  
4
4.5  
5
1798 G10  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
1798 G11  
1798 G12  
4
LTC1798 Series  
U
U
U
PI FU CTIO S  
DNC (Pins 1, 5, 7, 8): Do Not Connect. Connected  
internally for post package trim. These pins must be left  
unconnected.  
R1+ R2  
VOUT = 2.385V  
;
R1 is connected from OUT  
R2  
to FB and R2 from FB to GND. Selecting R2 ≥ 10k will  
make IOUT < 250µA.  
IN (Pin 2): Positive Supply. Bypassing with a 0.1µF  
capacitor is recommended if the output loading changes.  
(VOUT + 0.2V) ≤ VIN ≤ 12.6V.  
GND (Pin 4): Negative Supply or Ground Connection.  
OUT (Pin 6): Reference Output. The output can source up  
to10mAandsinkupto2mA.Itisstablewithoutputbypass  
capacitor ranging from 0µF to 1µF.  
DNC (Pin 3): (LTC1798-2.5/LTC1798-3/LTC1798-4.1/  
LTC1798-5) Do Not Connect. Connected internally for  
post package trim. This pin must be left unconnected.  
FB (Pin 3): (LTC1798) Resistor Divider Feedback Pin.  
ConnectaresistordividerfromOUTtoGNDandthecenter  
tap to FB. This pin sets the output potential.  
W
BLOCK DIAGRA  
2
IN  
+
OUT  
R1  
6
–
2.385V  
FB 3 (LTC1798)  
R2  
GND  
4
1798 BD  
NOTE: R1 AND R2 ARE NOT CONNECTED FOR LTC1798  
5
LTC1798 Series  
U
W
U U  
APPLICATIO S I FOR ATIO  
Longer Battery Life  
capacitance is required, a resistor in series with the  
capacitor is recommended to reduce the output ringing.  
Figure 2 illustrates the use of a damping resistor for  
capacitive loads greater than 1µF. Figure 3 shows the  
resistor and capacitor values required to achieve critical  
damping.  
Series references have an advantage over shunt style  
references. Tooperate, shuntreferencesrequirearesistor  
between the power supply and the output. This resistor  
must be chosen to supply the maximum current that is  
demanded by the circuit being regulated. When the circuit  
beingcontrolledisnotoperatingatthismaximumcurrent,  
the shunt reference must always sink this current, result-  
ing in high power dissipation and short battery life.  
LTC1798-5  
5.2V  
2
6
IN  
5V  
TO  
OUT  
C
12.6V  
OUT  
TheLTC1798serieslowdropoutreferencesdonotrequire  
a current setting resistor and can operate with any supply  
voltage from (VOUT(NOMINAL) + 0.2V) to 12.6V. When the  
circuitry being regulated does not demand current, the  
LTC1798 series reduces its dissipation and battery life is  
extended. If the reference is not delivering load current it  
dissipates only 10.8µW when operating on a 2.7V supply  
for LTC1798-2.5, yet the same connection can deliver  
10mA of load current when demanded.  
>1µF  
GND  
4
0.1µF  
DAMPING RESISTOR  
<1k  
1798 F02  
Figure 2. Adding a Damping Resistor with  
Output Capacitors Greater Than 1µF  
10k  
1k  
Output Bypass Capacitor  
The LTC1798 series is designed to be stable with or  
without capacitive loads. With no capacitive load, the  
referenceisidealforfastsettlingapplications,orwherePC  
board space is at a premium.  
100  
10  
In applications with significant output loading changes,  
an output bypass capacitor of up to 1µF can be used to  
improve the output transient response. Figure 1 shows  
the response of the reference to a 1mA to 0µA load step  
with a 1µF output capacitor. If more than 1µF of output  
1
10  
100  
1000  
OUTPUT CAPACITOR VALUE (µF)  
1798 F03  
Figure 3. Damping Resistance vs Output Capacitor Value  
1mA  
IOUT  
1mA  
IOUT  
0mA  
0mA  
VOUT  
100mV/DIV  
VOUT  
100mV/DIV  
10ms/DIV  
0.5ms/DIV  
1798 F01a  
1798 F01b  
Figure 1. Reference Output Load Transient Response, 1µF Output Capacitor  
6
LTC1798 Series  
U
W U U  
APPLICATIO S I FOR ATIO  
Internal P-Channel Pass Transistor  
These references consume only 4µA of quiescent current  
underlightandheavyloadsaswellasindropout;whereas,  
PNP-based references waste considerable amounts of  
current when the pass transistor is saturated. In addition,  
the LTC1798 series provides a lower dropout voltage  
(200mV max) than PNP-based references.  
TheLTC1798seriesfeaturesaninternalP-channelMOSFET  
pass transistor. This provides several advantages over  
similar designs using a PNP bipolar pass transistor.  
U
PACKAGE DESCRIPTIO  
Dimensions in inches (millimeters) unless otherwise noted.  
S8 Package  
8-Lead Plastic Small Outline (Narrow 0.150)  
(LTC DWG # 05-08-1610)  
0.189 – 0.197*  
(4.801 – 5.004)  
7
5
8
6
0.150 – 0.157**  
(3.810 – 3.988)  
0.228 – 0.244  
(5.791 – 6.197)  
1
3
4
2
0.010 – 0.020  
(0.254 – 0.508)  
× 45°  
0.053 – 0.069  
(1.346 – 1.752)  
0.004 – 0.010  
(0.101 – 0.254)  
0.008 – 0.010  
(0.203 – 0.254)  
0°– 8° TYP  
0.016 – 0.050  
(0.406 – 1.270)  
0.050  
(1.270)  
BSC  
0.014 – 0.019  
(0.355 – 0.483)  
TYP  
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH  
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE  
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD  
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE  
SO8 1298  
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.  
7
LTC1798 Series  
U
TYPICAL APPLICATIO S  
Micropower Low Dropout Negative Reference  
Supply Splitter  
0.2V ≤ V ≤ 8.5V  
CC  
2
IN  
LTC1798-2.5  
2.5V  
VIRTUAL  
GROUND  
6
2
6
V
= 5V  
IN  
OUT  
OUT LTC1798-3  
CC  
0.1µF  
0.1µF  
8
0.1µF  
GND  
4
2
3
GND  
4
–
1
1798 TA04  
V
OUT  
= –3V  
1/2 LTC1542  
+
1798 TA03  
4
V
SS  
= –4V  
Low Power, Low Voltage Supply Reference for LTC1096L  
1µF  
MPU  
1
2
3
4
8
7
6
5
CS/  
V
CC  
SHDN  
SERIAL DATA LINK  
(MICROWIRETM AND  
SPI COMPATIBLE)  
+IN  
ANALOG INPUT  
0V TO 3V RANGE  
CLK  
LTC1096L  
–IN  
D
OUT  
SERIAL DATA LINK  
GND  
V
REF  
6
OUT  
V
IN  
4
2
GND  
IN  
3.2V TO  
12.6V  
0.1µF  
LTC1798-3  
1798 TA05  
MICROWIRE is a trademark of National Semiconductor Corporation.  
RELATED PARTS  
PART NUMBER  
DESCRIPTION  
COMMENTS  
LT®1389  
Nanopower Precision Shunt Voltage Reference  
800nA Quiescent Current, 0.05% Max, 10ppm/°C Max Drift  
1.25V and 2.5V Versions, SO-8 Package  
LT1634  
LT1460  
LT1461  
LT1790  
Micropower Precision Shunt Voltage Reference  
Micropower Series Reference  
0.05% Max, 25ppm/°C Max Drift, 1.25V, 2.5V, 4.096V and 5V Outputs  
0.075% Max, 10ppm/°C Max Drift, 2.5V, 5V and 10V Outputs  
0.04% Max, 3ppm/°C Max Drift, 35µA Quiescent Current  
0.05% Max, 10ppm/°C Max, 2.5V, 60µA Supply  
Micropower Precision Series Voltage Reference  
SOT-23, LDO Precision Micropower Reference  
1798fa LT/LCG 1100 2K REV A • PRINTED IN USA  
LINEAR TECHNOLOGY CORPORATION 1999  
LinearTechnology Corporation  
1630 McCarthy Blvd., Milpitas, CA 95035-7417  
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com  

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SI9137DB

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9137LG

 Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications

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SI9122E

 500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers

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