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DC356A

P1-P3P4-P6P7-P9P10-P10
1
DEMO MANUAL DC355/DC356
NO-DESIGN SWITCHER
LT1959 Monolithic 4A Switcher
5V to 15V Input
1.8V Output
Demonstration circuits DC355 and DC356 are complete
DC/DC step-down regulators using the LT
®
1959 constant
frequency, high efficiency converter in 7-pin DD (DC356)
and SO-8 (DC355) packages. These circuits are primarily
used in personal computers, disk drives, portable
handheld devices and, in larger systems, as local onboard
regulators. High frequency switching allows the use of
small inductors, making this all surface mount solution
ideal for space conscious systems.
, LTC and LT are registered trademarks of Linear Technology Corporation.
DC355 Component Side DC356 Component Side
T
A
= 25°C, V
IN
= 5V, I
LOAD
= 2A, V
OUT
= 1.8V, SHDN and SYNC pins open, unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage (Note 1) 1.75 1.8 1.85 V
Maximum I
LOAD
(Note 2) 4.3 A
Input Voltage Range 4.5 15 V
Switching Frequency 460 500 540 kHz
Output Ripple Voltage 25 mV
P-P
Line Regulation 5V to 15V 4 mV
Load Regulation I
LOAD
= 10mA to 4A 10 mV
SHDN Lockout Threshold 2.3 2.38 2.46 V
SHDN Shutdown Threshold 0.15 0.37 0.6 V
Synchronization Range DC355 Only 580 1000 kHz
Supply Current SHDN = 0V 20 µA
Note 1: Output voltage variations include ±1% tolerance of feedback
divider network.
Note 2: For DC355, additional thermal restrictions apply.
DESCRIPTIO
U
PERFOR A CE SU ARY
UW
WW
BOARD PHOTOS
2
NO-DESIGN SWITCHER
DEMO MANUAL DC355/DC356
TYPICAL PERFOR A CE CHARACTERISTICS
UW
1.8V Output Efficiency Temperature Rise vs Load Current
PACKAGE A D SCHE ATIC DIAGRA SM
WUW
+
BOOST
D1
MBRD835L
D3*
MMBD914LT1
D2*
OPTIONAL
L1
6.8µH
U1
LT1959CS8
E6
SYNC
*MOVE D3 TO POSITION D2
FOR OUTPUT VOLTAGES >3.3V
C5
100µF
10V
+
C3
10µF
25V
R2
1.21k
1%
R3
2.49k
1%
+
C7
OPTIONAL
E5
V
OUT
3.3V/4A
E4
GND
C4
1µF
10V
SW
SYNC
V
IN
2
4
DC355 SCHEM
5
R1
3.3k
E1
V
IN
5V TO 15V
E2
SHDN
E3
GND
C2
3.3nF
C1
OPTIONAL
8
7
1
6
3
SHDN
FB
V
C
GND
+
C6
0.47µF
10V
+
BOOST
D1
MBRD835L
D3*
MMBD914LT1
D2*
OPTIONAL
L1
6.8µH
U1
LT1959CR
*MOVE D3 TO POSITION D2
FOR OUTPUT VOLTAGES >3.3V
C5
100µF
10V
+
C3
10µF
25V
R2
1.21k
1%
R3
2.49k
1%
+
C7
OPTIONAL
E5
V
OUT
3.3V/4A
E4
GND
C4
1µF
10V
SWV
IN
6
4
DC356 SCHEM
1
R1
3.3k
E1
V
IN
5V TO 15V
E2
SHDN
E3
GND
C2
3.3nF
C1
OPTIONAL
35
2
7
SHDN
FB
V
C
GND
+
C6
0.47µF
10V
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
V
IN
BOOST
FB
GND
V
SW
SYNC
SHDN
V
C
DC355
DC356
LT1959CS8
FB
BOOST
V
IN
GND
V
SW
SYNC OR SHDN
V
C
R PACKAGE
7-LEAD PLASTIC DD PAK
FRONT VIEW
TAB
IS
GND
7
6
5
4
3
2
1
LT1959CR
LOAD CURRENT (A)
0
90
85
80
75
70
65
60
3
DC355/356 TA01
12 4
5V
IN
12V
IN
EFFICIENCY (%)
LOAD CURRENT (A)
0
80
100
DC355
DC356
120
3
DC355/356 TA02
60
40
12 4
20
0
DIE TEMPERATURE RISE (°C)
V
IN
= 5V
V
OUT
= 1.8V
3
DEMO MANUAL DC355/DC356
NO-DESIGN SWITCHER
PARTS LISTS
REFERENCE
DESIGNATOR QUANTITY PART NUMBER DESCRIPTION VENDOR TELEPHONE
C1 0 Optional Capacitor
C2 1 08055C332MAT2S 3300pF 50V X7R Chip Capacitor AVX (843) 946-0362
C3 1 GRM235Y5V106Z 10µF 25V Y5V Chip Capacitor Murata (770) 436-1300
C4 1 0805ZC105MAT2S 1µF 10V X7R Chip Capacitor AVX (843) 946-0362
C5 1 TPSD107M010R0080 100µF 10V TPS Tantalum Capacitor AVX (207) 282-5111
C6 1 0603ZG474MAT3S 0.47µF 10V Y5V Chip Capacitor AVX (843) 946-0362
C7 1 Optional Capacitor
D1 1 MBRD835L SMT Diode ON Semiconductor (602) 244-6600
D2 1 MMBD914LT1 1N914 Diode ON Semiconductor (602) 244-6600
D3 1 Optional Diode
E1 to E6 6 2501-2 Pad Turret Mill-Max (516) 922-6000
R1 1 CR10-332JM 3.3k 1/8W 5% Chip Resistor AAC (714) 255-9186
R2 1 CR10-1821F-T 1.82k 1/8W 1% Chip Resistor AAC (714) 255-9186
R3 1 CR10-4991F-T 4.99k 1/8W 1% Chip Resistor AAC (800) 508-1521
L1 1 DO3316P-682 6.8µH 20% Inductor Coilcraft (847) 639-6400
U1 1 LT1959CS8 SO-8 Linear IC LTC (408) 432-1900
DC355
REFERENCE
DESIGNATOR QUANTITY PART NUMBER DESCRIPTION VENDOR TELEPHONE
C1 0 Optional Capacitor
C2 1 08055C332MAT2S 3300pF 50V X7R Chip Capacitor AVX (843) 946-0362
C3 1 GRM235Y5V106Z 10µF 25V Y5V Chip Capacitor Murata (770) 436-1300
C4 1 0805ZC105MAT2S 1µF 10V X7R Chip Capacitor AVX (843) 946-0362
C5 1 TPSD107M010R0080 100µF 10V TPS Tantalum Capacitor AVX (207) 282-5111
C6 1 0603ZG474MAT3S 0.47µF 10V Y5V Chip Capacitor AVX (843) 946-0362
C7 1 Optional Capacitor
D1 1 MBRD835L SMT Diode ON Semiconductor (602) 244-6600
D2 1 MMBD914LT1 1N914 Diode ON Semiconductor (602) 244-6600
D3 1 Optional Diode
E1 to E6 6 2501-2 Pad Turret Mill-Max (516) 922-6000
R1 1 CR10-332JM 3.3k 1/8W 5% Chip Resistor AAC (714) 255-9186
R2 1 CR10-1821F-T 1.82k 1/8W 1% Chip Resistor AAC (714) 255-9186
R3 1 CR10-4991F-T 4.99k 1/8W 1% Chip Resistor AAC (800) 508-1521
L1 1 DO3316P-682 6.8µH 20% Inductor Coilcraft (847) 639-6400
U1 1 LT1959CR 7-Pin DD Pak Linear IC LTC (408) 432-1900
DC356
P1-P3P4-P6P7-P9P10-P10

DC356A

Mfr. #:
Buy DC356A
Manufacturer:
Analog Devices Inc.
Description:
Power Management IC Development Tools LT1959CR - 4.5A Switch, 500kHz Step-Down
Lifecycle:
New from this manufacturer.
Delivery:
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