900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LT1579 Datasheet

300mA Dual Input Smart Battery Backup Regulator

No Preview Available !

FEATURES
s Maintains Output Regulation with Dual Inputs
s Dropout Voltage: 0.4V
s Output Current: 300mA
s 50µA Quiescent Current
s No Protection Diodes Needed
s Two Low-Battery Comparators
s Status Flags Aid Power Management
s Adjustable Output from 1.5V to 20V
s Fixed Output Voltages: 3V, 3.3V and 5V
s 7µA Quiescent Current in Shutdown
s Reverse-Battery Protection
s Reverse Current Protection
s Remove, Recharge and Replace Batteries Without
Loss of RegulationDaisy-Chained Control Outputs
U
APPLICATIONS
s Dual Battery Systems
s Battery Backup Systems
s Automatic Power Management for
Battery-Operated Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V Dual Battery Supply
IN1
+
1µF 2.7M
LBI1
OUT
1M LT1579-5
+ IN2
1µF 2.7M
LBI2
1M
SS
SHDN
LBO1
LB02
BACKUP
DROPOUT
BIASCOMP
GND
5V
+ 300mA
4.7µF
TO
POWER
MANAGEMENT
0.01µF
1579 TA01
LT1579
300mA Dual Input Smart
Battery Backup Regulator
DESCRIPTION
The LT®1579 is a dual input, single output, low dropout
regulator. This device is designed to provide an
uninterruptible output voltage from two independent input
voltage sources on a priority basis. All of the circuitry
needed to switch smoothly and automatically between
inputs is incorporated.
The LT1579 can supply 300mA of output current from
either input at a dropout voltage of 0.4V. Quiescent current
is 50µA, dropping to 7µA in shutdown. Two comparators
are included to monitor input voltage status. Two addi-
tional status flags indicate which input is supplying power
and provide an early warning against loss of output
regulation when both inputs are low. A secondary select
pin is provided so that the user can force the device to
switch from the primary input to the secondary input.
Internal protection circuitry includes reverse-battery pro-
tection, current limiting, thermal limiting and reverse-
current protection.
The device is available in fixed output voltages of 3V, 3.3V
and 5V, and as an adjustable device with a 1.5V reference
voltage. The LT1579 regulators are available in narrow
16-lead SO and 16-lead SSOP packages with all features,
and in SO-8 with limited features.
Automatic Input Switching
12
10 VIN1 SWITCHOVER
8 POINT
VIN2 = 10V
ILOAD = 50mA
80
6 IIN1
IIN2 60
4 40
2 20
00
5.05
5.00
4.95
0 2 4 6 8 10 12 14 16 18 20
TIME (ms)
1578 TA02
1


Linear Technology Electronic Components Datasheet

LT1579 Datasheet

300mA Dual Input Smart Battery Backup Regulator

No Preview Available !

LT1579
ABSOLUTE MAXIMUM RATINGS
Power Input Pin Voltage ...................................... ±20V*
Output Pin Voltage
Fixed Devices............................................. 6.5V, – 6V
Adjustable Device ............................................ ±20V*
Output Pin Reverse Current .................................... 5mA
ADJ Pin Voltage .............................................. 2V, – 0.6V
ADJ Pin Current ...................................................... 5mA
Control Input Pin Voltage ............................ 6.5V, – 0.6V
Control Input Pin Current ....................................... 5mA
BIASCOMP Pin Voltage ............................... 6.5V, – 0.6V
BIASCOMP Pin Current .......................................... 5mA
Logic Flag Output Voltage ............................ 6.5V, – 0.6V
Logic Flag Input Current ......................................... 5mA
Output Short-Circuit Duration .......................... Indefinite
Storage Temperature Range ................. – 65°C to 150°C
Operating Junction Temperature Range .... 0°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
*For applications requiring input voltage ratings greater than 20V,
consult factory.
PACKAGE/ORDER I FOR ATIO
GND 1
POWER
INPUTS
VIN1 2
VIN2 3
SS 4
CONTROL SHDN 5
INPUTS LBI1 6
LBI2 7
GND 8
TOP VIEW
16 GND
15 OUT
14 BACKUP
13 DROPOUT LOGIC
12 LBO1
OUTPUTS
11 LBO2
10 BIASCOMP
9 GND
ORDER PART
NUMBER
LT1579CGN-3
LT1579CGN-3.3
LT1579CGN-5
LT1579CS-3
LT1579CS-3.3
LT1579CS-5
GND 1
POWER
INPUTS
VIN1 2
VIN2 3
SS 4
CONTROL SHDN 5
INPUTS LBI1 6
LBI2 7
GND 8
TOP VIEW
16 GND
15 OUT
14 ADJ
13 BACKUP
12 LBO1
11 LBO2
LOGIC
OUTPUTS
10 BIASCOMP
9 GND
ORDER PART
NUMBER
LT1579CGN
LT1579CS
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
SEE APPLICATION INFORMATION SECTION
TJMAX = 125°C, θJA = 95°C/W (GN)
TJMAX = 125°C, θJA = 68°C/W (S)
GN PART MARKING
15793
157933
15795
GN PACKAGE
S PACKAGE
16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SO
SEE APPLICATION INFORMATION SECTION
TJMAX = 125°C, θJA = 95°C/W (GN)
TJMAX = 125°C, θJA = 68°C/W (S)
GN PART MARKING
1579
TOP VIEW
ORDER PART
NUMBER
POWER
INPUTS
CONTROL
INPUT
VIN1
VIN2
SHDN
GND
1
2
3
4
8 OUT
7 BACKUP LOGIC
6 DROPOUT OUTPUTS
5 BIASCOMP
LT1579CS8-3
LT1579CS8-3.3
LT1579CS8-5
S8 PACKAGE
8-LEAD PLASTIC SO
SEE APPLICATION INFORMATION SECTION
TJMAX = 125°C, θJA = 90°C/W
S8 PART MARKING
15793
157933
15795
TOP VIEW
POWER
INPUTS
CONTROL
INPUT
VIN1
VIN2
SHDN
GND
1
2
3
4
8 OUT
7 ADJ
LOGIC
6 BACKUP OUTPUT
5 BIASCOMP
S8 PACKAGE
8-LEAD PLASTIC SO
SEE APPLICATION INFORMATION SECTION
TJMAX = 125°C, θJA = 90°C/W
ORDER PART
NUMBER
LT1579CS8
S8 PART MARKING
1579
Consult factory for Industrial and Military grade parts.
2


Part Number LT1579
Description 300mA Dual Input Smart Battery Backup Regulator
Maker Linear Technology
PDF Download

LT1579 Datasheet PDF






Similar Datasheet

1 LT1571 Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag
Linear Technology
2 LT1572 100kHz/ 1.25A Switching Regulator with Catch Diode
Linear Technology
3 LT1573 Low Dropout PNP Regulator Driver
Linear Technology
4 LT1575 Ultrafast Transient Response/ Low Dropout Regulators Adjustable and Fixed
Linear Technology
5 LT1576 1.5A/ 200kHz Step-Down Switching Regulator
Linear Technology
6 LT1576-5 1.5A/ 200kHz Step-Down Switching Regulator
Linear Technology
7 LT1577 Ultrafast Transient Response/ Low Dropout Regulators Adjustable and Fixed
Linear Technology
8 LT1578 1.5A/ 200kHz Step-Down Switching Regulator
Linear Technology
9 LT1578-2.5 1.5A/ 200kHz Step-Down Switching Regulator
Linear Technology





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy