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DC2422A-A

P1-P3P4-P6P7-P9P10-P12P13-P14
4
dc2422af
DEMO MANUAL DC2422A-A,
DC2422A-B, DC2422A-C
OPTIONAL INDUCTOR DCR CURRENT SENSING
Table 3. Optional Inductor DCR Current Sensing
CONFIGURATION
CHANNEL1 RS1 R39 R40 C15 R51 R53 R62
CHANNEL2 RS2 R80 R81 C56 R89 R90 R91
Current Sense Resistor (Default) Ref. Sch. Ref. Sch. Ref. Sch. Ref. Sch. OPEN OPEN OPEN
Inductor DCR Current Sensing 0Ω Copper OPEN OPEN Calculated Value from Data Sheet 0Ω
Low Quiescent Current Applications and Measurement
The typical quiescent current (I
Q
) of the LTC7812 controller
is 28µA in sleep mode as specified in the LTC7812 data
sheet. However, the input current of the DC2422A 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
the board. Refer to Table 4 for the low input quiescent
current setup.
Table 4. Low Input Quiescent Current Configuration
Reference Designator R46 R92
Function PGOOD1 OV2
Stuffing Option OPEN OPEN
Figure 3. DC2422A-A V
OUT1
Typical Efficiency vs Load Current
Figure 4b. DC2422A-B Partially Regulated V
OUT
Figure 4a. DC2422A-B V
OUT1
Typical FCM Efficiency vs Load Current
I
OUT
(A)
0.1
EFFICIENCY (%)
100
90
80
70
60
50
40
30
1
dc2422a F03
10
V
IN
= 8V BURST
V
IN
= 36V BURST
V
IN
= 8V FCM
V
IN
= 36V FCM
V
OUT1
= 12V EFFICIENCY
V
OUT1
V
OUT
= V
IN
V
BUCK
V
BOOST
16V
BUCK
ACTIVE
BOOST
ACTIVE
PASS-THRU
WIRE MODE
10V
dc2422a F04b
V
IN
I
OUT
(A)
0.1
EFFICIENCY (%)
100
90
80
70
60
50
40
30
1
dc2422a F04a
10
V
IN
= 12V
V
IN
= 8V
V
IN
= 36V
5
dc2422af
DEMO MANUAL DC2422A-A,
DC2422A-B, DC2422A-C
OPTIONAL INDUCTOR DCR CURRENT SENSING
Figure 5. DC2422A-C V
BUS
Typical Efficiency vs Load Current
Figure 7. DC2422A-A V
OUT1
Voltage Ripple at V
IN
= 8V
Figure 9. DC2422A-A V
OUT1
2A – 4A – 2A
Load Transient at V
IN
= 8V
Figure 6. DC2422A-C V
OUT1
Typical Efficiency vs Load Current
Figure 8. DC2422A-A V
OUT1
Voltage Ripple at V
IN
= 36V
Figure 10. DC2422A-A V
OUT1
2A – 4A – 2A
Load Transient at V
IN
= 36V
I
OUT
(A)
0.1
EFFICIENCY (%)
100
90
80
70
95
85
75
65
60
55
50
1
dc2422a F05
10
PULSE SKIP
BURST
FCM
V
IN
= 8V, V
BUS
= 12V EFFICIENCY
20mV/DIV
20MHz BW
5µs/DIV
dc2422 F07
20mV/DIV
20MHz BW
200µs/DIV
dc2422 F09
20mV/DIV
50mV/DIV
I
OUT
(A)
0.1
EFFICIENCY (%)
100
90
80
70
60
50
40
30
1
dc2422a F06
10
V
IN
= 8V BURST
V
IN
= 36V BURST
V
IN
= 8V FCM
V
IN
= 36V FCM
V
OUT1
= 5V EFFICIENCY
6
dc2422af
DEMO MANUAL DC2422A-A,
DC2422A-B, DC2422A-C
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC2422A-A Required Circuit Components
1 1 CIN1 CAP, 33µF, 63V, 20%, ELEC SUN ELEC. 63HVH33M
2 1 COUT1 CAP, 100µF, 50V, 20%, ELEC PANASONIC, EEHZA1H101P
3 6 CIN2, CIN3, CIN4, COUT6, COUT8, C59, C80 CAP, 10µF, X7R, 50V, 10%, 1210 AVX, 12105C106KAT2A
4 1 COUT4 CAP, 4.7µF, X7R, 16V, 20%, 1206 TDK, C3216X7R1C475M
5 2 COUT5, COUT11 CAP, 150µF, 16V, 20% 7343 PANASONIC, 16TQC150MYF
6 5 C4, C17, C21, C47, C52 CAP, 0.1µF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E104K
7 2 C5, C51 CAP, 4.7µF, X5R, 50V, 10%, 0805 TDK, C2012X5R1H475K125AB
8 4 C15, C53, C56, C62 CAP, 1nF, X7R, 50V, 10%, 0603 AVX, 06035C102KAT2A
9 1 C43 CAP, 68pF, NPO, 50V, 10%, 0603 AVX, 06035A680KAT2A
10 1 C44 CAP, 2.2nF, X7R, 50V, 10%, 0603 AVX, 06035C222KAT2A
11 1 C54 CAP, 10nF, X7R, 50V, 10%, 0603 TDK, C1608X7R1H103K
12 1 C61 CAP, 1µF, X5R, 25V, 20%, 0603 TDK, C1608X5R1E105M
13 1 C64 CAP, 4.7µF X5R, 10V, 20%, 0603 AVX, 0603ZD475MAT2A
14 2 D1, D2 DIODE, SCHOTTKY, 40V, 3A, SOD323 CENTRAL SEMI, CMDSH-4E
15 0 D3 DIODE, SCHOTTKY, 40V, 3A, SMB DIODES INC, B340B-13-F OPTION
16 0 L1 IND, 4.7µH COILCRAFT, XAL7070-472
17 0 L2 IND, 1.0µH COILCRAFT, XAL7070-102
18 2 Q1, Q2 XSTR, N-CHANNEL MOSFET INFINEON, BSC093N04LS
19 2 Q21, Q22 XSTR, N-CHANNEL MOSFET INFINEON, BSC027N04LS
20 1 RS1 RES., SENSE, 0.003Ω, 1/2W, 1%, 2010 VISHAY, WSL20103L000FEA
21 2 RS2, RS3 RES., SENSE, 0.004Ω, 1/2W, 1%, 2010 VISHAY, WSL20104L000FEA
22 1 R33 RES., 35.7k, 1/10W, 1%, 0603 VISHAY, CRCW060335K7FKEA
23 1 R35 RES., 15k, 1/10W, 5%, 0603 VISHAY, CRCW060315K0JNEA
24 1 R43 RES., 499k, 1/10W, 1%, 0603 VISHAY, CRCW0603499KFKEA
25 3 R46, R48, R92 RES., 100k, 1/10W, 5%, 0603 VISHAY, CRCW0603100KJNEA
26 1 R75 RES., 3.6k, 1/10W, 1%, 0603 VISHAY, CRCW06033K60FKEA
27 1 R78 RES., 549k, 1/10W, 1%, 0603 VISHAY, CRCW0603549KFKEA
28 1 R79 RES., 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA
29 1 R81 RES., 100Ω, 1/10W, 5%, 0603 VISHAY, CRCW0603100RJNEA
30 1 R86 RES., 2.2Ω, 1/10W, 5%, 0603 VISHAY, CRCW06032R20JNEA
31 1 U1 IC, LOW I
Q
, 38V BOOST + BUCK
SYNCHRONOUS CONTROLLER
LINEAR TECH. LTC7812EUH#PBF
P1-P3P4-P6P7-P9P10-P12P13-P14

DC2422A-A

Mfr. #:
Buy DC2422A-A
Manufacturer:
Analog Devices Inc.
Description:
Power Management IC Development Tools LTC7812EUH Demo Board - 4V ? VIN ? 36V;
Lifecycle:
New from this manufacturer.
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