DC2435A - Demo Manual

DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
LTC7813EUH
4V to 56V VIN, Step-Up/Step-Down
Power Supply
Description
Demonstration circuit DC2435A is a step-up/down supply featuring the LTC®7813EUH. The LTC7813 is a high
performance dual output (buck and boost) synchronous
DC/DC switching regulator controller. The board has three
different configurations:
DC2435A-A: Regulated output voltage of 24 Volt
DC2435A-B: Narrowed output voltage between 20V and
28V
DC2435A-C:Dual output voltages of 24V (Boost VBUS
channel) and 5V (Buck VOUT1 channel)
The circuit enables a drop-in layout where the total circuit
area is only 1½" by 1½". The LTC7813EUH is in a 32-lead
exposed pad QFN package.
The main features of the board include rail tracking (buck
channel only), an internal 5V linear regulator for bias,
separate RUN pins for each output and a Mode selector
that allows the converter to run in CCM, pulse-skipping
or Burst Mode operation. Synchronization to an external
clock is also possible.
Performance Summary
The LTC7813 buck input is supplied from the Boost output
for the DC2435A-A and DC2435A-B only. With this boostthen-buck topology, the buck outputs maintain regulation
over the entire input range of 4V to 56V, making it suitable
for automotive or other battery fed applications where low
quiescent current is important.
The DC2435A-B is designed such that VOUT is partially
regulated between 20V and 28V for higher efficiency
(Figure 5a), reduced power loss, and switching noise.
When VIN is between 20V and 28V, it operates in passthru mode with the boost synchronous FET fully on and
the buck in drop-out with >99% duty cycle. When VIN is
below 20V, the boost is activated and when VIN is above
28V, the buck is activated as shown in Figure 5b.
The LTC7813 data sheet gives a complete description of
the part, operation and application information and must
be read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2435A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Specifications are at TA = 25°C
Table 1
SYMBOL
PARAMETER
VIN
VOUT1
Input Supply Range
Output1 Voltage Range
VBUS
fSW
CONDITIONS
-A
-B
-C
MIN
VIN = 4V* – 56V, IOUT1 = 0A to 5A#
VBUS Voltage Range (-C only)
VIN < 24V
Typical Free Running Switching Frequency Efficiency
See Figures 4, 5, 6 and 7 for
-A
VIN = 14V, VOUT1 = 24V, IOUT1 = 5A
VIN = 48V, VOUT1 = 24V, IOUT1 = 5A
efficiency curves
-B
VIN = 14V, VOUT1 = 20V, IOUT1 = 5A
VIN = 24V, VOUT1 = 24V, IOUT1 = 5A
VIN = 48V, VOUT1 = 28V, IOUT1 = 5A
-C
VIN = 14V, VBUS = 24V, IBUS = 3A
VIN = 14V, VOUT1 = 5V, IOUT1 = 8A
VIN = 48V, VOUT1 = 5V, IOUT1 = 8A
# IOUT1 starts to de-rate when VIN < 14V.
* VIN needs to be > 8V to start up.
4
23.5
19
4.9
23.5
200
TYP
24
5**
24
94.6
96.9
96.3
98.5
97.3
97.1
92.8
88.9
MAX
UNITS
56
24.5
28.6
5.1
24.5
kHz
V
V
V
V
V
%
%
%
%
%
%
%
%
** VOUT1 follows VIN when VIN < 5V.
dc2435af
1
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Demo Board Options
Figure 1. DC2435A/LTC7813 Demo Board Options
Quick Start Procedure
DC2435A is easy to set up to evaluate the performance of
the LTC7813EUH. Refer to Figure 2 for proper measurement equipment setup and follow the procedure below:
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the VIN
or VOUT and GND terminals or directly across relevant
capacitor. See Figure 3 for proper scope probe technique.
1. Place jumpers in the following positions:
JP1ON
JP2ON
JP3FCM
2. With power off, connect the input power supply to VIN
and GND.
2
3. Turn on the power at the input.
NOTE: Make sure that the input voltage is higher than
8V and does not exceed 56V.
4. Check for the proper output voltages for different
boards.
-A:VOUT1 = 23.5V to 24.5V,
-B: 19V < VOUT1 < 28.6V,
-C:VOUT1 = 4.9V to 5.1V;
VBUS = 23.5V to 24.5V (VIN < 24V)
NOTE: If there is no output, temporarily disconnect
the load to make sure that the load is not set too high.
5. Once the proper output voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage, efficiency
and other parameters.
dc2435af
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Quick Start Procedure
-­‐ A IOUT V -­‐ + Load + IOUT -­‐ A
Load + -­‐ V
+ A IIN + Vin supply -­‐ + V
-­‐ -­‐ + Figure 2. Proper Measurement Equipment Setup
+
VOUT
–
COUT
GND
Figure 3. Measuring Input or Output Ripple Across Terminals or Directly Across Ceramic Capacitor
dc2435af
3
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Frequency Synchronization and Mode Selection
DC2435A’s mode selector allows the converter to run in
forced continuous operation, pulse skip operation, Burst
Mode or be synchronizing to an external clock by changing
the position of JP3.
Table 2. Mode Selection and Synchronized Operation Options
CONFIGURATION
JP3
Forced Continuous Operation
FCM
Pulse-Skipping Operation
PS/Sync
Synchronized to External Clock Applied to CLKIN Pin
PS/Sync
Burst Mode Operation
Burst
Rail Tracking
DC2435A is configured for an on board soft start circuit.
The soft start ramp rate can be adjusted by changing the
value of C47. DC2435A can also be modified to track an
external reference. Refer to Table 3 for tracking options
and to the data sheet for more details.
Table 3. VOUT1 Tracking Options
CONFIGURATION
R34
R37
C47
TRK/SS1
TURRET
Soft-Start Without
Tracking (Default)
OPEN
OPEN
0.1µF
OPEN
Resistor
Divider
OPEN
External
Reference
VOUT1 Tracking Scaled
External Reference
Optional Inductor DCR Current Sensing
DC2435A provides an optional circuit for Inductor DCR
Current Sensing. Inductor DCR Current Sensing uses the
DCR of the inductor to sense the inductor current instead
of discrete sense resistors. The advantages of DCR sensing
are lower cost, reduced board space and higher efficiency,
but the disadvantage is a less accurate current limit. If
DCR sensing is used, be sure to select an inductor current
with a sufficiently high saturation current or use an iron
powder type material.
Refer to Table 4 for Optional Inductor DCR Current Sensing
setup and to the data sheet for more details.
Table 4. Optional Inductor DCR Current Sensing
CHANNEL 1
CONFIGURATION
Current Sense Resistor (Default)
Inductor DCR Current Sensing
CHANNEL 2
RS1
R39
R40
C15
R51
R53
R62
RS2
R80
R81
C56
R89
R90
R91
Ref. Sch.
Ref. Sch.
Ref. Sch.
Ref. Sch.
OPEN
OPEN
OPEN
0Ω Copper
OPEN
OPEN
Calculated Value from Data Sheet
0Ω
Low Quiescent Current Applications and Measurement
The typical quiescent current (IQ) of the LTC7813 controller
is 29µA in sleep mode as specified in the LTC7813 data
sheet. However, the input current of the DC2435A board
can be higher than this value because of additional circuit
outside of the IC. To reduce the total input current, large
value FB divider resistors should be used. In addition, some
of the optional pull-up resistors should be removed from
4
the board. Refer to Table 5 for the low input quiescent
current setup.
Table 5. Low Input Quiescent Current Configuration
Reference Designator
Function
Stuffing Option
R46
PGOOD1
OPEN
dc2435af
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
100
95
EFFICIENCY (%)
90
85
80
75
70
VIN = 48V, BURST
VIN = 14V, BURST
VIN = 48V, FCM
VIN = 14V, FCM
65
60
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
IOUT (A)
DC2435A F04
Figure 4. DC2435A-A VOUT1 Typical Efficiency vs Load Current
100
VOUT1
VOUT = VIN
95
VBUCK
EFFICIENCY (%)
90
85
80
VBOOST
75
70
VIN = 14V
VIN = 24V
VIN = 48V
65
60
BUCK
ACTIVE
PASS-THRU
“WIRE MODE”
BOOST
ACTIVE
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
IOUT (A)
20V
VIN
28V
DC2435A F05b
DC2435A F05a
Figure 5a. DC2435A-B VOUT1 Typical
Efficiency vs Load Current
Figure 5b. DC2435A-B VOUT1 Operating
Modes vs VIN
Figure 5.
100
100
90
95
EFFICIENCY (%)
EFFICIENCY (%)
80
90
85
80
70
0
0.5
1
1.5
IOUT (A)
2
2.5
60
50
40
Burst Mode
PULSE-SKIPPING
FCM
75
70
VIN = 14V, BURST
VIN = 14V, FCM
VIN = 48V, BURST
VIN = 48V, FCM
30
3
DC2435A F06
Figure 6. DC2435A-C VBUS Typical
Efficiency vs Load Current (VIN = 14V)
20
0
1
2
3
4
5
IOUT (A)
6
7
8
9
DC2435A F07
Figure 7. DC2435A-C VOUT1 Typical
Efficiency vs Load Current
dc2435af
5
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
20MHz BW
20MHz BW
20mV/DIV
20mV/DIV
10µs/DIV
DC2435A F08
10µs/DIV
Figure 8. DC2435A-A VOUT1 Voltage
Ripple at VIN = 14V
Figure 9. DC2435A-A VOUT1 Voltage
Ripple at VIN = 48V
20MHz BW
20MHz BW
200mV/DIV
200mV/DIV
100µs/DIV
DC2435A F10
Figure 10. DC2435A-A VOUT1 0A to 2.5A
Load Transient at VIN = 14V
6
DC2435A F09
100µs/DIV
DC2435A F11
Figure 11. DC2435A-A VOUT1 0A to 2.5A
Load Transient at VIN = 48V
dc2435af
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Parts List
ITEM
QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2435A-A
Required Circuit Components
1
2
CIN1, COUT1
CAP, 33µF, 63V, 20%, ELEC
SUN ELEC. 63HVH33M
2
1
COUT2
CAP, 100µF, 63V, 20%, ELEC
UNITED CHEMI CON,
EMZA630ADA101MJA0G
3
6
CIN2, CIN3, CIN4, COUT6, COUT8, C80 CAP, 4.7µF, X7R, 100V, 10%,1210
MURATA, GRM32ER72A475KE14L
4
2
COUT4, C5
CAP, 2.2µF, X7R, 100V,10%,1206
MURATA, GRM31CR72A225KA73L
5
2
COUT5, COUT11
CAP, 68µF, 35V, 20%, D8
PANASONIC, EEHZA1V680XP
6
5
C4, C17, C21, C47, C52
CAP, 0.1µF, X7R, 25V ,10%, 0603
TDK, C1608X7R1E104K
7
3
C15, C56, C62
CAP, 1nF, X7R, 50V,10%,0603
AVX, 06035C102KAT2A
8
1
C43
CAP, 68pF, NPO, 50V, 10%,0603
AVX, 06035A680KAT2A
9
1
C44
CAP, 4.7nF, X7R, 50V,10%,0603
AVX, 06035C472KAT2A
10
1
C49
CAP, 47pF X7R, 50V, 5%, 0603
AVX, 06035A470JAT2A
11
1
C53
CAP, 820pF X7R, 50V, 5%, 0603
AVX, 06035A821JAT2A
12
1
C54
CAP, 27nF, X7R, 50V,10%, 0603
AVX, 06035C273KAT2A
13
1
C61
CAP, 1µF, X5R, 25V, 20%, 0603
TDK, C1608X5R1E105M
14
2
C64, C81
CAP, 4.7µF X5R,10V, 20%, 0603
AVX, 0603ZD475MAT2A
15
1
L1
IND, 22µH
COILCRAFT, SER1390-223MLD
16
1
L2
IND, 15µH
COILCRAFT, XAL1510-153MED
17
1
Q1
XSTR, N-CHANNEL MOSFET
INFINEON, BSC123N08NS3G
18
1
Q2
XSTR, N-CHANNEL MOSFET
INFINEON, BSC042NE7NS3G
19
1
Q21
XSTR, N-CHANNEL MOSFET
INFINEON, BSC026N08NS5
20
1
Q22
XSTR, N-CHANNEL MOSFET
INFINEON, BSC072N08NS5
21
1
R33
RES., 11.5kΩ,1/10W, 1%, 0603
VISHAY, CRCW060311K5FKEA
22
1
R35
RES., 7.5kΩ,1/10W, 1%, 0603
VISHAY, CRCW06037K5FKEA
23
2
R43, R78
RES., 332kΩ,1/10W, 1%, 0603
VISHAY, CRCW0603332KFKEA
24
2
R46, R48
RES., 100kΩ,1/10W, 5%, 0603
VISHAY, CRCW0603100KJNEA
25
1
R72
RES., 37.4kΩ,1/10W, 1%, 0603
VISHAY, CRCW060337K4FKEA
26
1
R75
RES., 3.6kΩ,1/10W, 1%, 0603
VISHAY, CRCW06033K60FKEA
27
1
R79
RES., 14.7kΩ,1/10W, 1%, 0603
VISHAY, CRCW060314K7FKEA
28
1
R81
RES., 100Ω,1/10W, 5%, 0603
VISHAY, CRCW0603100RJNEA
29
1
R86
RES., 2.2Ω,1/10W, 5%, 0603
VISHAY, CRCW06032R20JNEA
30
1
R92
RES., 90.9kΩ,1/10W, 1%, 0603
VISHAY, CRCW060390K9FKEA
31
1
RS1
RES., SENSE, 0.008Ω,1/2W, 1%, 2010
VISHAY, WSL20108L000FEA18
32
1
RS2
RES., SENSE, 0.006Ω,1/2W, 1%, 2010
VISHAY, WSL20106L000FEA18
33
1
U1
IC, LOW IQ, 60V BOOST + BUCK SYNCHRONOUS
CONTROLLER
LINEAR TECH. LTC7813EUH#PBF
Additional Demo Board Circuit Components
1
0
C1, C2, C3, CIN5, C6, C59, C68
CAP, OPTION, 1210
OPTION
2
0
C36
CAP, OPTION, 1206
OPTION
3
0
C7, C39, C40, C51, C66, C67, C73, C74, CAP, OPTION, 0805
C78, C79
OPTION
4
0
C55, C57, C60, C63, C65, C77
OPTION
CAP, OPTION, 0603
dc2435af
7
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Parts List
ITEM
QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
5
0
D3
DIODE, OPTION, SMB
OPTION
6
0
D4
DIODE, OPTION, SOD323
OPTION
7
0
L3
IND, OPTION
OPTION
8
0
Q9, Q11, Q18, Q19
XSTR, OPTION, N-CHANNEL MOSFET
OPTION
9
11
R34, R36, R39, R40, R70, R80, R95,
R96, R103, R105, R108
RES., 0Ω, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
10
0
R37, R51, R53, R55, R62, R85, R89,
R90, R91, R93, R94, R104, R106,
R107, R109, R110, R111
RES., OPTION, 0603
OPTION
11
0
R82
RES., OPTION, 1206
OPTION
12
0
R100
RES., OPTION, 0805
OPTION
13
0
R101
RES., OPTION, 2010
OPTION
14
1
R102
RES., 0Ω, 2010
VISHAY, CRCW20100000Z0EF
15
0
RS3
RES., SENSE, OPT, 2010
OPTION
Hardware: For Demo Board Only
1
14
E1-E14
TURRET
MILL-MAX, 2501-2-00-80-00-00-07-0
2
2
JP1, JP2
CONN., HEADER, 1×3, 2mm
WURTH ELEKTRONIK, 620-003-111-21
3
1
JP3
CONN., HEADER, 2×3, 2mm
WURTH ELEKTRONIK, 620-006-211-21
4
3
XJP1, XJP2, XJP3
SHUNT, 2mm
WURTH ELEKTRONIK, 608-002-134-21
5
6
J1, J2, J3, J4, J5, J6
JACK, BANANA
KEYSTONE, 575-4
6
0
J9, J10
PAD
NONE
7
4
STANDOFF, SNAP ON
KEYSTONE, 8832
DC2435A-B
1
2
CIN1, COUT1
CAP, 33µF, 63V, 20%, ELEC
SUN ELEC. 63HVH33M
2
1
COUT2
CAP, 100µF, 63V, 20%, ELEC
UNITED CHEMI CON,
EMZA630ADA101MJA0G
3
6
CIN2, CIN3, CIN4, COUT6, COUT8, C80 CAP, 4.7µF, X7R, 100V, 10%,1210
MURATA, GRM32ER72A475KE14L
4
2
COUT4, C5
CAP, 2.2µF, X7R, 100V,10%,1206
MURATA, GRM31CR72A225KA73L
5
2
COUT5, COUT11
CAP, 68µF, 35V, 20%, D8
PANASONIC, EEHZA1V680XP
6
5
C4, C17, C21, C47, C52
CAP, 0.1µF, X7R, 25V ,10%, 0603
TDK, C1608X7R1E104K
7
3
C15, C56, C62
CAP, 1nF, X7R, 50V,10%,0603
AVX, 06035C102KAT2A
8
1
C43
CAP, 68pF, NPO, 50V, 10%,0603
AVX, 06035A680KAT2A
9
1
C44
CAP, 4.7nF, X7R, 50V,10%,0603
AVX, 06035C472KAT2A
10
1
C49
CAP, 47pF X7R, 50V, 5%, 0603
AVX, 06035A470JAT2A
11
1
C53
CAP, 820pF X7R, 50V, 5%, 0603
AVX, 06035A821JAT2A
12
1
C54
CAP, 27nF, X7R, 50V,10%, 0603
AVX, 06035C273KAT2A
13
1
C61
CAP, 1µF, X5R, 25V, 20%, 0603
TDK, C1608X5R1E105M
14
2
C64, C81
CAP, 4.7µF X5R,10V, 20%, 0603
AVX, 0603ZD475MAT2A
15
1
L1
IND, 22µH
COILCRAFT, SER1390-223ML
16
1
L2
IND, 15µH
COILCRAFT, XAL1510-153MED
17
1
Q1
XSTR, N-CHANNEL MOSFET
INFINEON, BSC123N08NS3G
18
1
Q2
XSTR, N-CHANNEL MOSFET
INFINEON, BSC042NE7NS3G
19
1
Q21
XSTR, N-CHANNEL MOSFET
INFINEON, BSC026N08NS5
8
dc2435af
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Parts List
ITEM
QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
20
1
Q22
XSTR, N-CHANNEL MOSFET
INFINEON, BSC072N08NS5
21
1
R33
RES., 9.76kΩ,1/10W, 1%, 0603
VISHAY, CRCW06039K76FKEA
22
1
R35
RES., 7.5kΩ,1/10W, 1%, 0603
VISHAY, CRCW06037K5FKEA
23
2
R43, R78
RES., 332kΩ,1/10W, 1%, 0603
VISHAY, CRCW0603332KFKEA
24
2
R46, R48
RES., 100kΩ,1/10W, 5%, 0603
VISHAY, CRCW0603100KJNEA
25
1
R72
RES., 37.4kΩ,1/10W, 1%, 0603
VISHAY, CRCW060337K4FKEA
26
1
R75
RES., 3.6kΩ,1/10W, 1%, 0603
VISHAY, CRCW06033K60FKEA
27
1
R79
RES., 21kΩ,1/10W, 1%, 0603
VISHAY, CRCW060321K0FKEA
28
1
R81
RES., 100Ω,1/10W, 5%, 0603
VISHAY, CRCW0603100RJNEA
29
1
R86
RES., 2.2ΩS,1/10W, 5%, 0603
VISHAY, CRCW06032R20JNEA
30
1
R92
RES., 90.9kΩ,1/10W, 1%, 0603
VISHAY, CRCW060390K9FKEA
31
1
RS1
RES., SENSE, 0.008Ω,1/2W, 1%, 2010
VISHAY, WSL20108L000FEA18
32
1
RS2
RES., SENSE, 0.006Ω,1/2W, 1%, 2010
VISHAY, WSL20106L000FEA18
33
1
U1
IC, LOW IQ, 60V BOOST + BUCK SYNCHRONOUS
CONTROLLER
LINEAR TECH. LTC7813EUH#PBF
Additional Demo Board Circuit Components
1
0
C1, C2, C3, CIN5, C6, C59, C68
CAP., OPTION, 1210
OPTION
2
0
C36
CAP,. OPTION, 1206
OPTION
3
0
C7, C39, C40, C51, C66, C67, C73, C74, CAP., OPTION, 0805
C78, C79
OPTION
4
0
C55, C57, C60, C63, C65, C77
CAP., OPTION, 0603
OPTION
5
0
D3
DIODE, OPTION, SMB
OPTION
6
0
D4
DIODE, OPTION, SOD323
OPTION
7
0
L3
IND., OPTION
OPTION
8
0
Q9, Q11, Q18, Q19
XSTR, OPTION, N-CHANNEL MOSFET
OPTION
9
11
R34, R36, R39, R40, R70, R80, R95,
R96, R103, R105, R108
RES., 0Ω, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
10
0
R37, R51, R53, R55, R62, R85, R89,
R90, R91, R93, R94, R104, R106,
R107, R109, R110, R111
RES., OPTION, 0603
OPTION
11
0
R82
RES., OPTION, 1206
OPTION
12
0
R100
RES., OPTION, 0805
OPTION
13
0
R101
RES., OPTION, 2010
OPTION
14
1
R102
RES., 0Ω, 2010
VISHAY, CRCW20100000Z0EF
15
0
RS3
RES., SENSE, OPT, 2010
OPTION
Hardware: For Demo Board Only
1
14
E1-E14
TURRET
MILL-MAX, 2501-2-00-80-00-00-07-0
2
2
JP1, JP2
CONN., HEADER, 1×3, 2mm
WURTH ELEKTRONIK, 620-003-111-21
3
1
JP3
CONN., HEADER, 2×3, 2mm
WURTH ELEKTRONIK, 620-006-211-21
4
3
XJP1, XJP2, XJP3
SHUNT, 2mm
WURTH ELEKTRONIK, 608-002-134-21
5
6
J1, J2, J3, J4, J5, J6
JACK, BANANA
KEYSTONE, 575-4
6
0
J9, J10
PAD
NONE
7
4
STANDOFF, SNAP ON
KEYSTONE, 8832
dc2435af
9
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Parts List
ITEM
QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2435A-C
1
2
CIN1, COUT1
CAP, 33µF, 63V, 20%, ELEC
SUN ELEC. 63HVH33M
2
1
COUT2
CAP, 100µF, 63V, 20%, ELEC
UNITED CHEMI CON,
EMZA630ADA101MJA0G
3
6
CIN2, CIN3, CIN4, COUT6, COUT8, C80 CAP, 4.7µF, X7R, 100V, 10%,1210
MURATA, GRM32ER72A475KE14L
4
2
COUT4, C5
CAP, 2.2µF, X7R, 100V,10%,1206
MURATA, GRM31CR72A225KA73L
5
2
COUT5, COUT11
CAP, 68µF, 35V, 20%, D8
PANASONIC, EEHZA1V680XP
6
5
C4, C17, C21, C47, C52
CAP, 0.1µF, X7R, 25V ,10%, 0603
TDK, C1608X7R1E104K
7
3
C15, C56, C62
CAP, 1nF, X7R, 50V,10%,0603
AVX, 06035C102KAT2A
8
1
C43
CAP, 68pF, NPO, 50V, 10%,0603
AVX, 06035A680KAT2A
9
1
C44
CAP, 4.7nF, X7R, 50V,10%,0603
AVX, 06035C472KAT2A
10
1
C49
CAP, 47pF X7R, 50V, 5%, 0603
AVX, 06035A470JAT2A
11
1
C53
CAP, 820pF X7R, 50V, 5%, 0603
AVX, 06035A821JAT2A
12
1
C54
CAP, 27nF, X7R, 50V,10%, 0603
AVX, 06035C273KAT2A
13
1
C61
CAP, 1µF, X5R, 25V, 20%, 0603
TDK, C1608X5R1E105M
14
2
C64, C81
CAP, 4.7µF X5R,10V, 20%, 0603
AVX, 0603ZD475MAT2A
15
1
L1
IND, 10µH
COILCRAFT, SER1390-103ML
16
1
L2
IND, 15µH
COILCRAFT, XAL1510-153MED
17
1
Q1
XSTR, N-CHANNEL MOSFET
INFINEON, BSC123N08NS3G
18
1
Q2
XSTR, N-CHANNEL MOSFET
INFINEON, BSC042NE7NS3G
19
1
Q21
XSTR, N-CHANNEL MOSFET
INFINEON, BSC026N08NS5
20
1
Q22
XSTR, N-CHANNEL MOSFET
INFINEON, BSC072N08NS5
21
1
R33
RES., 63.4kΩ,1/10W, 1%, 0603
VISHAY, CRCW060363K4FKEA
22
1
R35
RES., 4.99kΩ,1/10W, 1%, 0603
VISHAY, CRCW06034K99FKEA
23
2
R43, R78
RES., 332kΩ,1/10W, 1%, 0603
VISHAY, CRCW0603332KFKEA
24
2
R46, R48
RES., 100kΩ,1/10W, 5%, 0603
VISHAY, CRCW0603100KJNEA
25
1
R72
RES., 37.4kΩ,1/10W, 1%, 0603
VISHAY, CRCW060337K4FKEA
26
1
R75
RES., 3.6kΩ,1/10W, 1%, 0603
VISHAY, CRCW06033K60FKEA
27
1
R79
RES., 17.4kΩ,1/10W, 1%, 0603
VISHAY, CRCW060317K4FKEA
28
1
R81
RES., 100Ω,1/10W, 5%, 0603
VISHAY, CRCW0603100RJNEA
29
1
R86
RES., 2.2Ω,1/10W, 5%, 0603
VISHAY, CRCW06032R20JNEA
30
1
R92
RES., 90.9kΩ,1/10W, 1%, 0603
VISHAY, CRCW060390K9FKEA
31
1
RS1
RES., SENSE,0.008Ω,1/2W, 1%, 2010
VISHAY, WSL20108L000FEA18
32
1
RS2
RES., SENSE, 0.010Ω,1/2W, 1%, 2010
VISHAY, WSL201010L000FEA18
33
1
U1
IC, LOW IQ, 60V BOOST + BUCK SYNCHRONOUS
CONTROLLER
LINEAR TECH. LTC7813EUH#PBF
Additional Demo Board Circuit Components
1
0
C1, C2, C3, CIN5, C6, C59, C68
CAP, OPTION, 1210
OPTION
2
0
C36
CAP, OPTION, 1206
OPTION
3
0
C7, C39, C40, C51, C66, C67, C73, C74, CAP, OPTION, 0805
C78, C79
OPTION
4
0
C55, C57, C60, C63, C65, C77
OPTION
10
CAP, OPTION, 0603
dc2435af
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Parts List
ITEM
QTY REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
5
0
D3
DIODE, OPTION, SMB
OPTION
6
0
D4
DIODE, OPTION, SOD323
OPTION
7
0
L3
IND, OPTION
OPTION
8
0
Q9, Q11, Q18, Q19
XSTR, OPTION, N-CHANNEL MOSFET
OPTION
9
11
R34, R36, R39, R40, R70, R80, R95,
R96, R103, R105, R108
RES., 0Ω, 1/10W, 0603
VISHAY, CRCW06030000Z0EA
10
0
R37, R51, R53, R55, R62, R85, R89,
R90, R91, R93, R94, R104, R106,
R107, R109, R110, R111
RES., OPTION, 0603
OPTION
11
0
R82
RES., OPTION, 1206
OPTION
12
0
R100
RES., OPTION, 0805
OPTION
13
1
R101
RES., 0Ω, 2010
VISHAY, CRCW20100000Z0EF
14
0
R102
RES., OPTION, 2010
OPTION
15
0
RS3
RES., SENSE, OPT, 2010
OPTION
Hardware: For Demo Board Only
1
14
E1-E14
TURRET
MILL-MAX, 2501-2-00-80-00-00-07-0
2
2
JP1, JP2
CONN., HEADER, 1×3, 2mm
WURTH ELEKTRONIK, 620-003-111-21
3
1
JP3
CONN., HEADER, 2×3, 2mm
WURTH ELEKTRONIK, 620-006-211-21
4
3
XJP1, XJP2, XJP3
SHUNT, 2mm
WURTH ELEKTRONIK, 608-002-134-21
5
6
J1, J2, J3, J4, J5, J6
JACK, BANANA
KEYSTONE, 575-4
6
0
J9, J10
PAD
NONE
7
4
STANDOFF, SNAP ON
KEYSTONE, 8832
dc2435af
11
D
C
B
A
OFF
ON
E11
OFF
ON
E10
E12
E9
E8
JP2
3
2
1
RUN2
JP1
3
2
1
RUN1
0
R34
VIN
VIN
VOUT1
R37
OPT
*
0
R36
R33
C60
OPT
C77
OPT
R111
OPT
R110
OPT
R46
100K
INTVCC
C49
47pF
1
2
VBUS
R43
332K
VIN
1. ALL RESISTORS AND CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
RUN2
RUN1
PGOOD1
TRACK / SS1
FREQ
CLKIN
ASSY VOUT1
‐A
24V/5A
‐B
28V
‐C
5V/8A
*
332K
R78
OPT
*
820pF
R35
68pF
VBUS
28V
20V
24V
0
R108
C47
0.1uF
27nF
C54
C53
C43
R107
OPT
INTVCC
0
R70
C55
R72
37.4K
R94
OPT
INTVCC
R33
11.5K
9.76K
63.4K
11
4
RUN2 17
R79
14.7K
21K
17.4K
3
14
23
3
20
5
19
6
RUN1 16
C52
0.1uF
SS2
SS1
R75
3.6K
ITH2
ITH1
C44
4.7nF
*
R79
VFB2
VFB1
9
10
JP3
R35
7.5K
7.5K
4.99K
GND
VPRG2
RUN2
RUN1
PGOOD1
SS2
TRK/SS1
ITH2
ITH1
VFB2
VFB1
FREQ
BURST
PS/SYNC
FCM
R80
0
1nF
R81
100
OPT
C63
BG2
TG2
SW2
BOOST2
EXTVCC
SENSE1-
SENSE1+
BG1
SW1
BOOST1
TG1
VBIAS
DRVCC
ILIM
DRVUV
DRVSET
R48
100K
INTVCC
4
4
R101 R102 RS2
L1
OPT
0
6m 22uH
OPT
0
6m 22uH
0
OPT 10m 10uH
C64
4.7uF
C56
U1
LTC7813EUH
6
4
2
PLLIN/MODE
5
3
1
MODE
INTVCC
INTVCC 15
E7
PGND
33
3
SENSE2+
S2+ 12
2
SENSE213
S2-
BOOST1
S1-
8
TG2
29
BG2
SW2
30
27
BOOST2
28
EXTVCC
S1+
7
25
BG1
31
1
32
INTVCC
INTVCC
R39
0
0
R95
4.7uF
0
R40
0
C21
0.1uF
5
R102
*
2010
OPT
C57
VIN
6
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
LT
DL
PCB DES.
7
+
TECHNOLOGY
CIN4
4.7uF
100V
1210
VIN
+
CIN1
33uF
63V
J2
J1
J6
VIN
VIN+
GND
GND
E2
VIN-
GND
4V -56V
E1
E6
VBUS
GND
GND
*
VOUT1
VBUS
E4
E5
+ COUT2
100uF
63V
J5
C36
OPT
1206
J4
VOUT1
*
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
CIN5
OPT
1210
33uF
63V
COUT11
68uF
35V
+ COUT1
+
J3
E3
SHT 2
DL
APPROVED
DATE:
N/A
SIZE
7
IC NO.
8
SHEET 1
LTC7813EUH
DEMO CIRCUIT 2435A
Thursday, December 10, 2015
2
OF 2
REV.
WIDE INPUT SYNCHRONOUS STEP UP/DOWN SUPPLY
TITLE: SCHEMATIC
VBUS
COUT5
68uF
35V
COUT8
4.7uF
100V
1210
CIN3
4.7uF
100V
1210
COUT6
4.7uF
100V
1210
COUT4
2.2uF
100V
1206
VOUT1
VBUS_
BG2
TG2
BG1
S2-
VL2-
TG1
S2+
S1-
VSW2
VL1-
12/10/15
DATE
8
S1+
SHT 2
PRODUCTION
SHT 2
REVISION HISTORY
DESCRIPTION
VSW1
C78
OPT
0805
CIN2
4.7uF
100V
1210
C5
2.2uF
100V
1206
0.008
C6
OPT
1210
APPROVALS
RS3
OPT
2
-
C79
OPT
0805
REV
ECO
RS1
C59
OPT
1210
*
VL1-
RS2
C3
OPT
1210
L1 *
C51
OPT
16V
0805
APP ENG.
VL2-
C2
OPT
1210
VSW1
15uH
R82
OPT
L2
CUSTOMER NOTICE
VSW2
C1
OPT
1210
Q2
BSC042NE7NS
C7
OPT
0805
*
2010
R101
VBUS
6
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
4
4
4
Q1
BSC123N08NS
Q22
BSC072N08NS
4
Q21
BSC026N08NS
C4
0.1uF
1nF
C15
INTVCC
C81
R96
0.1uF
C17
TG1
VBIAS
R104 OPT
R103 0
R106 OPT
R105 0
R92 90.9k
R109 OPT
2
26
24
18
21
22
C62
1nF
INTVCC
5
5
6
7
8
1
2
3
5
6
7
8
1
2
3
5
6
7
8
1
2
3
5
6
7
8
12
1
2
3
1
D
C
B
A
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Schematic Diagram
dc2435af
VIN
E13
C39
OPT
0805
SGND
EXTVCC
E14
C40
OPT
0805
R55
OPT
EXTVCC
C73
OPT
0805
VBUS
C61
1uF
OPT
R93
2
C74
OPT
0805
D4
OPT
S1-
VSW1
1
VOUT1
SHT 1
SHT 1
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
VSW1
BG1
SHT 1
SHT 1
BG1
VSW1
TG1
4
4
Q19
OPT
OPT
R62
VIN VBUS
S1-
R53
OPT
VL1-
S1+
Q18
OPT
VIN
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
L3
SCALE = NONE
DL
LT
APPROVALS
BG2
VSW2
TG2
OPT
4
Q9
OPT
OPT
R91
TECHNOLOGY
4
C67
OPT
0805
S2+
R90
OPT
C68
OPT
1210
VL2-
S2-
D3
OPT
GND
VIN_EMI
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Q11
OPT
VBUS
J10
J9
VL2- SHT 1
S2- SHT 1
DATE:
N/A
SIZE
IC NO.
Thursday, December 10, 2015
SHEET 2
LTC7813EUH
DEMO CIRCUIT 2435A
2
OF 2
REV.
WIDE INPUT SYNCHRONOUS STEP UP/DOWN SUPPLY
TITLE: SCHEMATIC
BG2
VSW2
SHT 1
OPT
0805
TG2
SHT 1
OPT
R89
OPT
C65
R100
VSW2
SHT 1
C66
OPT
0805
SHT 1 S2+
SHT 1 VSW2
C80
4.7uF
100V
1210
VL1- SHT 1
S1+ SHT 1
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
TG1
SHT 1
SHT 1
2.2
OPT
R86
R85
VBUS_
OPT
R51
VBIAS
VSW1
WHEN DCR SENSING IS IMPLEMENTED,SHORT RS1 & RS2.
REMOVE R30, R29, R80 & R81.STUFF R62 AND R91 WITH 0 OHMS.
CALCULATE R51, R53 & C15 AND R89, R90 & C56 PER THE DATA SHEET.
ALSO REFER TO QSG FOR EXAMPLE.
NOTE:
5
6
7
8
1
2
3
5
6
7
8
1
2
3
5
6
7
8
1
2
3
5
6
7
8
1
2
3
1
2
OPTIONAL DCR SENSING
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
Schematic Diagram
dc2435af
13
DEMO MANUAL DC2435A-A/
DC2435A-B/DC2435A-C
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
14 Linear Technology Corporation
dc2435af
LT 0516 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
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