LT1761ES5-1.5 Linear Technology, LT1761ES5-1.5 Datasheet - Page 16

• Manufacturer Part Number: LT1761ES5-1.5
• Description: 100mA/ Low Noise/ LDO Micropower Regulators in SOT-23
• Manufacturer: Linear Technology

RELATED PARTS
PACKAGE DESCRIPTIO
PART NUMBER
LT1120
LT1121
LT1129
LT1175
LT1521
LT1529
LT1762 Series
LT1763 Series
LTC1928
LT1962 Series
LT1963
LT1764
LTC3404
Burst Mode is a trademark of Linear Technology Corporation.
LT1761 Series
16
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 2 A. 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
(LTC DWG # 05-08-1633)
5-Lead Plastic SOT-23
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
S5 Package
DESCRIPTION
125mA Low Dropout Regulator with 20 A I
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 50 A I
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
(0.014 – 0.022)
NOTE:
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)
0.35 – 0.55
U
Dimensions in inched (millimeters) unless otherwise noted.
(0.102 – 0.118)
(0.059 – 0.069)
1.50 – 1.75
2.60 – 3.00
Q
Q
(0.004 – 0.008)
0.09 – 0.20
(NOTE 2)
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.
(0.00 – 0.006)
0.00 – 0.15
FIVE PLACES (NOTE 2)
(0.014 – 0.020)
0.35 – 0.50
COMMENTS
Includes 2.5V Reference and Comparator
30 A I
50 A Quiescent Current
45 A I
15 A I
500mV Dropout Voltage
25 A Quiescent Current, 20 V
30 A Quiescent Current, 20 V
Low Output Noise: 60 V
30 A Quiescent Current, 20 V
40 V
40 V
Burst Mode
100
90
80
70
60
50
40
30
20
10
0
RMS
RMS
0
Figure 6. Reverse Output Current
Q
Q
Q
T
V
CURRENT FLOWS
INTO OUTPUT PIN
V
(LT1761-BYP, -SD)
J
IN
OUT
, SOT-223 Package
, 0.26V Dropout Voltage, SOT-223 Package
, Reverse Battery Protection
LT1761-3
= 25 C
(0.035 – 0.057)
(0.035 – 0.051)
LT1761-2.8
1
, SOT-223 Package
, 340mV Dropout Voltage
= 0V
0.90 – 1.45
0.90 – 1.30
= V
LT1761-2.5
TM
2
ADJ
LT1761-2
Operation, Monolithic, 100% Duty Cycle
LT1761-1.8
OUTPUT VOLTAGE (V)
LT1761-1.5
3
4
(0.110 – 0.118)
1761fa LT/TP 0401 2K REV A • PRINTED IN USA
LT1761-5
2.80 – 3.00
5
(NOTE 3)
RMS
LINEAR TECHNOLOGY CORPORATION 1999
6
(100kHz BW)
(0.074)
RMS
RMS
RMS
1.90
REF
7
LT1761-BYP
LT1761-SD
LT1761-3.3
Noise
Noise
Noise
8
1761 F06
9
10
S5 SOT-23 0599
(0.037)
0.95
REF