LT1761-1.8(RevA) 데이터 시트보기 (PDF) - Linear Technology
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LT1761-1.8 Datasheet PDF : 16 Pages
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LT1761 Series
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when the
ADJ pin is at 7V. The 13V difference between output and
ADJ pin divided by the 5mA maximum current into the ADJ
pin yields a minimum top resistor value of 2.6k.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage or is left open
circuit. Current flow back into the output will follow the
curve shown in Figure 6.
When the IN pin of the LT1761-X is forced below the OUT
pin or the OUT pin is pulled above the IN pin, input current
will typically drop to less than 2µA. This can happen if the
input of the device is connected to a discharged (low
voltage) battery and the output is held up by either a
backup battery or a second regulator circuit. The state of
the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.
100
TJ = 25°C
90 VIN = 0V
CURRENT FLOWS
80 INTO OUTPUT PIN
70 VOUT = VADJ
(LT1761-BYP, -SD)
60
LT1761-1.5
50
LT1761-1.8
LT1761-2
40
LT1761-2.5
30 LT1761-2.8
LT1761-3
20
LT1761-BYP
LT1761-SD
10
LT1761-3.3
LT1761-5
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT VOLTAGE (V)
1761 F06
Figure 6. Reverse Output Current
PACKAGE DESCRIPTIO Dimensions in inched (millimeters) unless otherwise noted.
S5 Package
5-Lead Plastic SOT-23
(LTC DWG # 05-08-1633)
2.60 – 3.00
(0.102 – 0.118)
1.50 – 1.75
(0.059 – 0.069)
0.00 – 0.15
(0.00 – 0.006)
0.90 – 1.45
(0.035 – 0.057)
2.80 – 3.00
(0.110 – 0.118)
(NOTE 3)
0.35 – 0.55
(0.014 – 0.022)
0.09 – 0.20
0.35 – 0.50
0.90 – 1.30
(0.004 – 0.008)
(0.014 – 0.020) (0.035 – 0.051)
NOTE:
(NOTE 2)
FIVE PLACES (NOTE 2)
1. DIMENSIONS ARE IN MILLIMETERS
2. DIMENSIONS ARE INCLUSIVE OF PLATING
3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
4. MOLD FLASH SHALL NOT EXCEED 0.254mm
5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
1.90
(0.074)
REF
0.95
(0.037)
REF
S5 SOT-23 0599
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DESCRIPTION
125mA Low Dropout Regulator with 20µA IQ
150mA Micropower Low Dropout Regulator
700mA Micropower Low Dropout Regulator
500mA Negative Low Dropout Micropower Regulator
300mA Low Dropout Micropower Regulator with Shutdown
3A Low Dropout Regulator with 50µA IQ
150mA, Low Noise, LDO Micropower Regulator
500mA, Low Noise, LDO Micropower Regulator
Doubler Charge Pump with Low Noise Linear Regulator
300mA, Low Noise, LDO Micropower Regulator
1.5A, Low Noise, Fast Transient Response LDO
3A, Low Noise, Fast Transient Response LDO
High Efficiency Synchronous Step-Down Switching Regulator
Burst Mode is a trademark of Linear Technology Corporation.
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900q FAX:(408)434-0507 q www.linear-tech.com
COMMENTS
Includes 2.5V Reference and Comparator
30µA IQ, SOT-223 Package
50µA Quiescent Current
45µA IQ, 0.26V Dropout Voltage, SOT-223 Package
15µA IQ, Reverse Battery Protection
500mV Dropout Voltage
25µA Quiescent Current, 20µVRMS Noise
30µA Quiescent Current, 20µVRMS Noise
Low Output Noise: 60µVRMS (100kHz BW)
30µA Quiescent Current, 20µVRMS Noise
40µVRMS, SOT-223 Package
40µVRMS, 340mV Dropout Voltage
Burst ModeTM Operation, Monolithic, 100% Duty Cycle
1761fa LT/TP 0401 2K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1999
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