LTC1771IS8 Linear Technology, LTC1771IS8 Datasheet - Page 13

• Manufacturer Part Number: LTC1771IS8
• Description: IC CTRLR DC/DC STEPDOWN HE 8SOIC
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1771IS8

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.23 ~ 18 V
• Current - Output: 5A
• Voltage - Input: 2.8 ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -

APPLICATIO S I FOR ATIO
With a 0.05
increasing the 0.5V Schottky diode dissipation to 1W.
C
temperature. C
TYPICAL APPLICATIO S
IN
is chosen for a RMS current rating of at least 1A at
OUT
sense resistor I
is chosen with an ESR of 0.05 for low
U
C
C
D1: MICROSEMI UPS5817
L1: SUMIDA CDRH6D38-220
C
C
D1: MICROSEMI UPS5817
L1: SUMIDA CR75-220
IN
OUT
220pF
IN
OUT
330pF
: AVX TPSC336M016R0300
U
: AVX TPSD226M025R0200
: SANYO POSCAP 6TPB150M
: SANYO POSCAP 6TPB150M
10k
1M
1%
10k
1%
1M
Low Dropout 5V/2A Regulator with Burst Mode Operation Disabled
0.01 F
0.01 F
SC(AVG)
3.3V to 2.5V/1A Regulator with Burst Mode Operation Enabled
U
1
2
3
4
W
1
2
3
4
RUN/SS
I
V
GND
TH
RUN/SS
I
V
GND
FB
TH
FB
= 2A will result,
LTC1771
LTC1771
1.02M
3.09M
5pF
1%
15pF
1%
SENSE
PGATE
MODE
SENSE
PGATE
MODE
U
V
V
IN
IN
8
7
6
5
8
7
6
5
1000pF
1000pF
output ripple. The output voltage ripple due to ESR is
approximately:
V
Si6447DQ
Si3443DV
ORIPPLE
D1
D1
R
0.05
R
22 H
SENSE
0.1
22 H
SENSE
L1
L1
(R
ESR
+
+
)( I
+
+
C
22 F
25V
C
150 F
6.3V
L
C
33 F
16V
C
150 F
6.3V
IN
2
OUT
) = 0.05 (0.89A
IN
OUT
1771 TA04
1771 TA01
V
5.5V
TO 18V
V
5V
2A
V
2.5V
1A
V
3.3V
TO 12V
IN
OUT
IN
OUT
P-P
LTC1771
) = 45mV
13
P-P