DEMO MANUAL DC140
DESIGN-READY SWITCHERS
LTC1436-PLL 2-Output
Synchronous Buck Converter
with Versatile Frequency Controller
DESCRIPTIO
Demonstration circuit DC140 is a 2-output, general pur-
pose evaluation platform intended to demonstrate the
many functions of the LTC
®
1436-PLL and to make it easy
to implement circuit changes. The switching frequency of
the LTC1436-PLL can be synchronized to an external
clock frequency or modulated to reduce EMI by decreas-
ing the average power of the switching harmonics. The
high efficiency, constant-frequency advantages of the
Adaptive Power
TM
output stage can be observed under
light load conditions. The enable and soft start features of
the LTC1436-PLL can also be observed, along with a
power-on reset (POR) signal for the main output.
PERFOR A CE SU
PARAMETER
Input Voltage Range
Output Voltage
TYPICAL PERFOR A CE CHARACTERISTICS A D BOARD PHOTO
Efficiency
100
95
90
EFFICIENCY (%)
CONTINUOUS
INDUCTOR
CURRENT
TRANSITION
REGION
85
80
75
70
65
60
55
50
1
ADAPTIVE
POWER MODE
V
IN
= 10V
V
O
= 5V
f
≈
170kHz
1A
3.2A
10
100
LOAD CURRENT (mA)
DC140 TA01
U
WW
U W
U
DC140 is intended for users with noise-sensitive applica-
tions where conducted and radiated emissions are impor-
tant design considerations. These applications include
radio, cell-phone and other wireless communication prod-
ucts. Two versions of DC140 are available; they differ only
in the magnitude of the second output voltage. Both
versions provide 5V at 3A on the main output. The second
output is derived from the main 5V output and postregulated
by an internal auxiliary linear regulator. Version A pro-
vides a second output voltage of 3.3V at 0.1A, whereas
version B provides a second output of 12V at 0.1A.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
U W
ARY
Operating Temperature Range 0°C to 50°C
VALUE
5.5V to 28V
4.9V to 5.1V
3.13V to 3.47V
11.4V to 12.6V
CONDITIONS
Maximum Input Voltage (Limited by External MOSFETs)
Main Output, 5V
3.3V Output (Version A)
12V Output (Version B)
Component Side
1
DEMO MANUAL DC140
DESIGN-READY SWITCHERS
PERFOR A CE SU
PARAMETER
Output Voltage Ripple
Line Regulation
Load Regulation
Frequency
Supply Current
Shutdown Current
PACKAGE DIAGRA
2
WW
W
U W
ARY
Operating Temperature Range 0°C to 50°C
VALUE
60mV
P-P
20mV
P-P
20mV
P-P
±5mV
40mV
170kHz
320µA
16µA
CONDITIONS
5V Output, 3A Load, 10MHz Bandwidth Limited
3.3V Output, 0.1A Load, 10MHz Bandwidth Limited
12V Output, 0.1A Load, 10MHz Bandwidth Limited
V
IN
= 6V to 20V, 5V Output
I
O
= 0A to 3A, 5V Output
Typical Free-Running Frequency, C
OSC
= 68pF
Typical, V
IN
= 15V, Both Outputs On (No Load)
Typical, V
IN
= 15V, RUN/SS = 0V
TOP VIEW
PLL LPF 1
C
OSC
2
RUN/SS 3
I
TH
4
SFB 5
SGND 6
V
PROG
7
V
OSENSE
8
SENSE
–
9
SENSE
+
10
AUXON 11
AUXFB 12
24 PLLIN
23 POR
22 BOOST
21 TGL
20 SW
19 TGS
18 V
IN
17 INTV
CC
16 BG
15 PGND
14 EXTV
CC
13 AUXDR
GN PACKAGE
24-LEAD PLASTIC SSOP
(150 MIL SSOP)
LTC1436CGN-PLL
J1-1
J1-6
SGND
J1-4 J1-5
PLLIN POR
E6
GND
+
C3
R1
47k
R3
510Ω
22µF
35V
22µF
35V
+
C4
R2
10k
C2
0.01µF
R15
10k
JP1
1
PLL LPF
C
OSC
RUN/SS
C8
0.1µF
T1-7 CONNECTION OPEN
ON THIS BOARD VERSION
T1
10µH
R6
0.025Ω
Q2
IRLML2803
D3
MBR0540T1
5
6
TP2
D2
OPEN
D1
OPEN
BOOST
22
1
POR
23
2
Q1-1
Si4936DY
PLLIN
24
2
3
R4
10Ω
7
8
C5
68pF
C6, 0.1µF
R5, 10k
4
I
TH
TGL
21
SCHE ATIC DIAGRA S
C7
47pF
+
JP3
5
SFB
SGND
V
PROG
V
OSENSE
SENSE –
BG
PGND
15
C17
0.1µF
SENSE +
16
4
Q1-2
Si4936DY
D4
MBRS140T3
3
C18
4.7µF
16V
INTV
CC
17
V
IN
18
TGS
19
SW
6
7
8
9
20
JP4
10k
U1
LTC1436-PLL
C10
OPEN
JP2
E7
V
OUT
5V
3A
JP5
JP6
C14
100µF
10V
+
R7
OPEN
C11
OPEN
C12, 100pF
+
C21
+
C13
100µF
10V
R8
OPEN
47µF
6.3V
C16
OPEN
10
+
C15
0.001µF
AUXON
AUXFB
AUXDR
TP1
JP7
13
EXTV
CC
14
11
12
E8
GND
JP8
R10
10Ω
R9
10Ω
JP9
JP10
JP11
D5
MMSD4148T1
R12
20k
1%
R13
35.7k
C19
47pF
R11
47k
C20
4.7µF
16V
R14
OPEN
Q3
MMBT2907LT1
E9
AUXOUT
3.3V
0.1A
E10
GND
DC140 • F01
DEMO MANUAL DC140
DESIGN-READY SWITCHERS
3
Figure 1. DC140A-A, 5V, 3A and 3.3V, 0.1A Outputs
W
C9
330pF
W
C1
0.001µF
J1-3
PLL LPF
J1-2
RUN
E5
V
IN
5.5V TO 28V
+
R2
10k
R1
47k
R3
510Ω
C2
0.01µF
22µF
35V
22µF
35V
R15
10k
JP1
1
PLL LPF
C
OSC
RUN/SS
C8
0.1µF
7
1
20
2
Q2
IRLML2803
D3
MBR0540T1
5
6
C14
100µF
10V
TP2
R6
0.025Ω
5
19
18
17
16
4
Q1-2
Si4936DY
3
C17
0.1µF
D4
MBRS140T3
15
D2
MMSZ5252BT1
T1
10µH
10
BOOST
22
1
D1
MBRS140T3
POR
23
2
Q1-1
Si4936DY
PLLIN
24
2
3
R4
10Ω
7
8
C5
68pF
C6, 0.1µF
C7, 47pF
4
I
TH
TGL
3
4
21
C9
330pF
R5, 10k
+
C10
3.3µF
35V
JP2
DESIGN-READY SWITCHERS
SCHE ATIC DIAGRA S
JP3, 90.9k
5
SFB
U1
LTC1436-PLL
TGS
V
IN
INTV
CC
BG
PGND
EXTV
CC
AUXDR
TP1
JP7
13
14
SGND
V
PROG
V
OSENSE
SENSE –
SENSE +
AUXON
AUXFB
C18
4.7µF
16V
SW
6
7
8
9
10
DEMO MANUAL DC140
JP4
E7
V
OUT
5V
3A
JP5
JP6
+
R7
OPEN
C11
OPEN
C12, 100pF
+
C21
+
C13
100µF
10V
R8
OPEN
47µF
6.3V
C16
OPEN
+
C15
0.001µF
11
12
E8
GND
JP8
R10
10Ω
R9
10Ω
JP9
JP10
JP11
D5
MMSD4148T1
R12
OPEN
C19
OPEN
R11
47k
R13
0Ω
C20
4.7µF
16V
Q3
MMBT2907LT1
E9
AUXOUT
12V
0.1A
R14
1M
1%
E10
GND
DC140 • F02
Figure 2. DC140A-B, 5V, 3A and 12V, 0.1A Outputs
W
W
4
J1-4 J1-5
PLLIN POR
E6
GND
E5
V
IN
6V TO 28V
J1-1
J1-6
SGND
C1
0.001µF
J1-3
PLL LPF
J1-2
RUN
+
C3
+
C4
+
DEMO MANUAL DC140
DESIGN-READY SWITCHERS
PARTS LIST
REFERENCE
DESIGNATOR
C1, C15
C2
C3, C4
C5
C6, C8, C17
C7, C19
C9
C12
C13, C14
C18, C20
C21
D3
D4
D5
E5 to E10
J1
JP1, JP2,
JP6 to JP8,
JP10
Q1
Q2
Q3
R1, R11
R2, R5,
R15, JP4
R3
R4, R9, R10
R6
R12
R13
T1
TP1, TP2
DC140A-A
PART NUMBER
08055C102KAT1A
08055C103KAT1A
T495X226M035AS
08055A680KAT1A
08055G104ZAT1A
08055A470KAT1A
08055A331KAT1A
08055A101KAT1A
TPSD107M010R0065
T494A475M016AS
EEFCDOJ470R
MBR0540T1
MBRS140T3
MMSD4148T1
2501-2
3801-06G2
CJ21-000J-T
DESCRIPTION
0.001µF 50V 10% X7R Chip Capacitor
0.01µF 50V 10% X7R Chip Capacitor
22µF 35V 20% Tantalum Capacitor
68pF 50V 10% NPO Chip Capacitor
0.1µF 50V – 20% 80% Chip Capacitor
47pF 50V 10% NPO Chip Capacitor
330pF 50V 10% NPO Chip Capacitor
100pF 50V 10% NPO Chip Capacitor
100µF 10V 20% Tantalum Capacitor
4.7µF 16V 20% Tantalum Capacitor
47µF 6.3V Polymer Capacitor
Schottky Diode
Schottky Diode
Diode
Terminal Turret
Pin Header 0.100 (1x6) Connector
Shunt Chip 0805
VENDOR
AVX
AVX
KEMET
AVX
AVX
AVX
AVX
AVX
AVX
KEMET
Panasonic
Motorola
Motorola
Motorola
Mill-Max
COMM CON
AVX
TELEPHONE
(843) 946-0362
(843) 946-0362
(408) 986-0424
(843) 946-0362
(843) 946-0362
(843) 946-0362
(843) 946-0362
(843) 946-0362
(843) 946-0690
(408) 986-0424
(201) 348-7522
(800) 441-2447
(800) 441-2447
(800) 441-2447
(516) 922-6000
(626) 301-4200
(843) 946-0362
QUANTITY
2
1
2
1
3
2
1
1
2
2
1
1
1
1
6
1
6
1
1
1
2
4
1
3
1
1
1
1
2
Si4936DY
IRLML2803
MMBT2907LT1
CR21-473J-T
CR21-103J-T
CR21-511J-T
CR21-100J-T
LR2010-01-R025F
CR21-2002F-T
CR21-3572F-T
CDRH125-100
1425-2
Dual N-Channel MOSFET
N-Channel MOSFET
Transistor PNP
47k 0.1W 5% Chip Resistor
10k 0.1W 5% Chip Resistor
510Ω 0.1W 5% Chip Resistor
10Ω 0.1W 5% Chip Resistor
0.025Ω 0.5W 1% Chip Resistor
20k 0.1W 1% Chip Resistor
35.7k 0.1W 1% Chip Resistor
10µH Inductor
Micro Pin Terminal
Siliconix
IR
Motorola
AVX
AVX
AVX
AVX
IRC
AVX
AVX
Sumida
Keystone
(800) 554-5565
(310) 322-3331
(800) 441-2447
(843) 946-0524
(843) 946-0524
(843) 946-0524
(843) 946-0524
(512) 992-7900
(843) 946-0524
(843) 946-0524
(847) 956-0666
(718) 956-8900
(408) 432-1900
U1
1
LTC1436CGN-PLL
I.C. LTC1436-PLL
LTC
Note: Part locations for C10, C11, C16, D1, D2, JP3, JP5, JP9, JP11, R7, R8 and R14 are not used on this assembly.
5
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