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LT1573CS8-2.8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
13
LT1573
sn1573 1573fas
equals the resistance of R
B1
, R
B2
, ..., and R
Bn
in parallel,
and the resistance R
D
equals the resistance of R
D1
, R
D2
, ...,
and R
Dn
in parallel.
Voltage Feedback Resistor Divider Table
Voltage feedback resistor divider is provided for conve-
nience for the most possibly used output voltages in
Table 4.
Table 4. LT1573 Output Feedback Divider Resistance
OUTPUT R1 (
Ω
)
VOLTAGE (V) R2 (
Ω
) (NEAREST 1%)
1.5 1k 187
1.8 1k 422
2.0 1k 576
2.2 1k 732
2.5 1k 976
2.8 1k 1210
3.0 1k 1370
3.3 1k 1620
3.5 1k 1780
3.8 1k 2000
4.0 1k 2150
4.5 1k 2550
5.0 1k 2940
COMP
V
OUT
FB
LATCH
LT1573
+
C
TIME
0.5µF
C
OUT2
C
OUT1
C
C
100pF
V
IN
5V
R
C
1k
1/8W
R
D
24Ω
1/2W
V
OUT
3.3V
GND
1573 TA01
R
B
50Ω
1/8W
R1
1.6k
1/8W
R2
1k
1/8W
LOAD
+ +
Q
OUT
MOTOROLA
D45H11
C
OUT1
= 24 × 1µF SURFACE MOUNT CERAMIC CAPACITOR
(FOR T < 45°C, C
OUT1
= 24 × 1µF Y5V CERAMIC SURFACE MOUNT CAPACITORS,
FOR T > 45°C, C
OUT1
= 24 × 1µF X7R CERAMIC SURFACE MOUNT CAPACITORS)
PLACE C
OUT1
IN THE MICROPROCESSOR SOCKET CAVITY
C
IN
, C
OUT2
= 220µF SURFACE MOUNT TANTALUM CAPACITOR
C
TIME
= 0.5µF FOR 100ms TIME OUT AT ROOM TEMPERATURE
SHDN (ACTIVE HIGH) PIN SHOULD BE TIED TO GROUND IF IT IS NOT USED
C
IN
5V
V
IN
DRIVE
SHDN
GND
+
3.3V/5A Microprocessor Supply
APPLICATIO S I FOR ATIO
WUUU
TYPICAL APPLICATIO S
U
14
LT1573
sn1573 1573fas
COMP
V
OUT
FB
LATCH
LT1573
+
C
TIME
0.5µF
C
OUT
V
IN
6V to 9V
R
D
130Ω
1/2W
V
OUT
5V
GND
1573 TA03
R
B
200Ω
1/8W
R1
2.94k
1/8W
R2
1k
1/8W
LOAD
+
MOTOROLA
D45H11
C
IN
= 150µF (SANYO SURFACE MOUNT ELECTROLYTIC, 10V, PART #10CV150BS)
OR 10µF LOW ESR TANTALUM CAPACITOR
C
OUT
=47µF (SANYO SURFACE MOUNT ELECTROLYTIC, 25V, PART #25CV47BS)
OR 150µF (SANYO SURFACE MOUNT ELECTROLYTIC, 10V, PART #10CV150BS)
C
TIME
= 0.5µF FOR 100ms TIME OUT AT ROOM TEMPERATURE
SHDN (ACTIVE HIGH) PIN SHOULD BE TIED TO GROUND IF IT IS NOT USED
C
IN
V
IN
DRIVE
SHDN
GND
+
COMP
V
OUT
FB
LATCH
LT1573
+
C
TIME
0.5µF
C
OUT2
C
OUT1
C
C
30pF
V
IN
3.3V
R
C
1k
1/8W
R
D
39Ω
1/2W
V
OUT
2.5V
GND
1573 TA02
R
B
200Ω
1/8W
R1
976Ω
1/8W
R2
1k
1/8W
LOAD
+ +
Q
OUT
MOTOROLA
D45H11
C
IN
= 22µF SURFACE MOUNT TANTALUM CAPACITOR
C
OUT1
= 10µF SURFACE MOUNT CERAMIC CAPACITOR
C
OUT2
= 15µF SURFACE MOUNT TANTALUM CAPACITOR
C
TIME
= 0.5µF FOR 100ms TIME OUT AT ROOM TEMPERATURE
SHDN (ACTIVE HIGH) PIN SHOULD BE TIED TO GROUND IF IT IS NOT USED
C
IN
V
IN
DRIVE
SHDN
GND
+
3.3V to 2.5/2A Voltage Regulator
5V/2A Output from 6V to 9V Wall Adapter Input
TYPICAL APPLICATIO S
U
15
LT1573
sn1573 1573fas
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3.3V to 2.85V/1A Voltage Regulator
High Efficiency 2.5V to 1.5V Converter at 6A Output Current
COMP
V
OUT
FB
LATCH
LT1573
+
C
TIME
0.5µF
C
OUT
V
IN
3.3V
R
D
91Ω
1/2W
V
OUT
2.85V
GND
1573 TA04
R
B
200Ω
1/8W
R1
1.24k
1/8W
R2
1k
1/8W
LOAD
+
MOTOROLA
D45H11
C
IN
,
C
OUT
= AVX 100µF/10V SURFACE MOUNT TANTALUM CAPACITOR
C
TIME
= 0.5µF FOR 100ms TIME OUT AT ROOM TEMPERATURE
SHDN (ACTIVE HIGH) PIN SHOULD BE TIED TO GROUND IF IT IS NOT USED
C
IN
V
IN
DRIVE
SHDN
GND
+
COMP
V
OUT
FB
LATCH
LT1573
+
C
TIME
0.5µF
C
OUT
V
IN2
3V
TO 7V
R
D
6Ω
1/2W
V
OUT
1.5V
V
IN1
2.5V
GND
1573 TA05
R
B
200Ω
1/8W
R1
186Ω
1/8W
R2
1k
1/8W
LOAD
MOTOROLA
D45H11
C
IN1
,
C
OUT
= AVX 100µF/10V SURFACE MOUNT TANTALUM CAPACITOR
C
IN2
= AVX 15µF/10V SURFACE MOUNT TANTALUM CAPACITOR
C
TIME
= 0.5µF FOR 100ms TIME OUT AT ROOM TEMPERATURE
SHDN (ACTIVE HIGH) PIN SHOULD BE TIED TO GROUND IF IT IS NOT USED
C
IN2
V
IN
DRIVE
SHDN
GND
+ +
C
IN1
+
TYPICAL APPLICATIO S
U
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1573CS8-2.8#PBF

Mfr. #:
Buy LT1573CS8-2.8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators Low Dropout Reg Driver 2.8V
Lifecycle:
New from this manufacturer.
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