DEMO MANUAL DC1453A
LTM4619EV: 4.5V-28V,
Dual 4A Step-Down µModule
Regulator
DESCRIPTION
Demonstration circuit 1453A features the LTM
®
4619EV, the
high input voltage, high efficiency, high density, dual 4A
step-down power module. Derating is necessary for certain
V
IN
, V
OUT
, and thermal conditions. The two outputs are
interleaved with 180° phase to minimize the input ripple
and reduce the input capacitors. A minimum design only
requires the bulk input and output capacitors and voltage
setting resistors. The LTM4619EV features output voltage
tracking, power good indicator, RUN pin control, clock
synchronization and soft-start programming. Protection
features include foldback current limiting and overvolt-
age protection. Burst Mode
®
operation or pulse skipping
mode can be selected for better light load efficiency. The
LTM4619 data sheet must be read in conjunction with
this demo manual for working on or modifying the demo
circuit 1453A.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage V
OUT1
, V
OUT2
Maximum Continuous Output Current
Default Operating Frequency
Efficiency of Channel 1
Efficiency of Channel 2
CONDITION
(T
A
= 25°C)
VALUE
4.5V to 28V
3.3V ±2%, 1.8V ±2%
Derating Is Necessary for Certain V
IN
, V
OUT
, and Thermal Conditions,
See Datasheet for Details.
JP2 on the 500kHz position.
V
IN
= 12V, V
OUT1
= 3.3V, I
OUT1
= 4A, Switching Frequency = 500kHz.
V
IN
= 12V, V
OUT2
= 1.8V, I
OUT2
= 4A, Switching Frequency = 500kHz.
4A
DC
for V
OUT1
, V
OUT2
500kHz
89.4%, See Figure 3
84.1% See Figure 3
BOARD PHOTO
dc1453af
1
DEMO MANUAL DC1453A
QUICK START PROCEDURE
Demonstration circuit 1453A is an easy way to evaluate the
LTM4619. If V
IN
is always below 5.5V, stuff a 0Ω resistor
at R16. Do not stuff R16 if V
IN
is higher than 5.5V. Please
refer to Figure 1 for proper measurement equipment setup
and follow the procedure below:
1. Place jumpers in the following positions for a typical
3.3V and 1.8V application:
MODE/
CLK SEL.
CCM
RUN1
On
FREQUENCY
500kHz
TRACK1
Soft-Start
RUN2
On
TRACK2
Soft-Start
3. Turn on the power at the input. The output voltage
between V
O1+
and V
O1–
should be 3.3V ±2%, and the
voltage between V
O2+
and V
O2–
should be 1.8V ±2%.
4. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
To measure input and output ripple, please refer to Fig-
ure 2 for proper setup. Keep in mind at high switching
frequencies and/or high input voltages, lower output
voltage may not regulate properly due to the minimum
on time of the regulator. Refer to the data sheet for more
details.
5. For output voltage tracking during start-up and shut-
down, set jumpers JP3 and JP4 to EXT SIGNAL and
apply a valid voltage signal to E8 and E10.
6. To synchronize the switching frequency to an external
clock set jumper JP2 in the EXT. CLK position and the
jumper JP1 in the BURST MODE / EXT. CLK position.
Apply a valid clock signal on the CLK SYNC test point.
2. With power off, preset the loads to 0A and V
IN
supply
to be less than 28V. Connect the input power supply,
load and meters as shown in Figure 1.
0A ~ 4A
LOAD
+
–
0A ~ 4A
LOAD
–
–
+
+
–
+
INPUT OR OUTPUT CAPACITOR
Figure 2. Proper Scope Probe Placement
for Measuring Input or Output Ripple
+
–
–
+
–
+
V
IN
Figure 1. Test Setup of DC1453A
dc1453af
2
DEMO MANUAL DC1453A
QUICK START PROCEDURE
3.3V V
OUT1
Efficiency at 500kHz Frequency
100
6V
IN
90
80
EFFICIENCY (%)
70
60
50
40
30
CCM
BURST
PS
0
1
3
2
LOAD CURRENT (A)
4
dc1453 F03a
1.8V V
OUT2
Efficiency at 500kHz Frequency
100
90
6V
IN
12V
IN
80
EFFICIENCY (%)
70
60
50
40
30
CCM
BURST
PS
0
1
3
2
LOAD CURRENT (A)
4
dc1453 F03b
12V
IN
28V
IN
28V
IN
Figure 3. Measured Efficiency for Two Outputs on DC1453A
V
OUT1
(100mV/DIV)
V
OUT2
(200mV/DIV)
I
OUT1
(4A/DIV)
I
OUT2
(4A/DIV)
dc1453 F04
dc1453 F05
V
IN
= 12V
V
OUT1
= 3.3V
CONTINUOUS CURRENT MODE (CCM)
0A TO 4A LOAD STEP ON V
OUT1
C
OUT1
= 100μF CERAMIC (1210, X5R, 6.3V) +
22μF CERAMIC (1206, X5R, 6.3V)
V
IN
= 12V
V
OUT2
= 1.8V
CONTINUOUS CURRENT MODE (CCM)
0A TO 4A LOAD STEP ON V
OUT2
C
OUT2
= 100μF CERAMIC (1210, X5R, 6.3V) +
22μF CERAMIC (1206, X5R, 6.3V)
Figure 4. Measured Load Transient Response for V
OUT1
Figure 5. Measured Load Transient Response for V
OUT2
dc1453af
3
DEMO MANUAL DC1453A
PARTS LIST
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
1
2
QUANTITY
1
2
2
2
2
1
2
1
1
1
1
1
1
1
0
REFERENCE
C8
C2, C3
C17, C20
C22, C23
C10, C13
C12
C25, C26
R2
R1
R3
R15
R4
U1
C30
C1, C4-C7, C9, C11,
C12, C14, C16-C18,
C19, C21, C24,
C27-C29
R7
R5, R6, R10
R8, R12
R9, R11, R13, R14,
R16
E1-E12
4 Corners
JP3, JP5, JP6
JP1, JP2
JP4
JP1-JP6
J1-J6
PART DESCRIPTION
Capacitor, Alum, 150μF 35V
,
Capacitor, X5R, 10μF 35V, 1206
,
Capacitor, X5R, 22μF 6.3V, 1206
,
Capacitor, X5R, 100μF 6.3V, 1210
,
Capacitor, NPO, 10pF 50V, 0603
,
Capacitor, NPO, 47pF 50V, 0603
,
Capacitor, X7R, 0.1μF 50V, 0603
,
Resistor, Chip, 2k, 1/10W, 5%
Resistor, Chip, 6.34k, 1/10W, 1%
Resistor, Chip, 19.1k, 1/10W, 1%
Resistor, Chip, 100k, 1/10W, 5%
Resistor, Chip, 48.7k, 1/10W, 1%
I.C., Dual 4A Step-Down Module
Capacitor, X5R, 1μF
,
35V, 0603
OPT
MANUFACTURER, PART NUMBER
Sanyo, 35CE150AX
Taiyo Yuden, GMK316BJ106MA-T
Taiyo Yuden, JMK316BJ226ML-T
Taiyo Yuden, JMK325BJ107MM-T
AVX, 06035A100KAT2A
AVX, 06035A470KAT2A
TDK, C1608X7R1H104K
Vishay, CRCW06032K00JKEA
Vishay, CRCW06036K34FKEA
Vishay, CRCW060319K1FKEA
Vishay, CRCW0603100KJNEA
Vishay, CRCW060348K7FKEA
Linear, Technology LTM4619EV LGA
Taiyo Yuden, GMK107BJ105KA-T
OPT
Required Circuit Components:
Additional Demo Board Circuit Components:
3
4
5
6
1
3
2
0
Resistor, Chip, 19.1k, 1/10W, 1%
Resistor, Chip, 60.4k, 1/10W, 1%
Resistor, Chip, 48.7k, 1/10W, 1%
OPT
Vishay, CRCW060319K1FKEA
Vishay, CRCW060360K4FKEA
Vishay, CRCW060348K7FKEA
OPT
Hardware for Demo Board Only:
1
2
3
4
5
6
7
12
4
3
2
1
6
6
Testpoint, Turret, 0.094"
Stand-Off, Nylon, 0.5"
Header, 3-Pin, 1-Row, 0.079CC
Header, 4-Pin, 1-Row, 0.079CC
Header, 3-Pin, 2-Row, 0.079CC
Shunt, 0.079" Center
Banana Jack
Mill-Max, 2501-2-00-80-00-00-07-0
Keystone, 8833 (SNAP ON)
Samtec, TMM-103-02-L-S
Samtec, TMM-104-02-L-S
Samtec, TMM-103-02-L-D
Samtec, 2SN-BK-G
Keystone, 575-4
dc1453af
4
A
B
C
D
E
E1
CLK SYNC
INTVCC
INTVCC
4
VIN
E2
VIN
C1
Opt.
0603
JP1
MODE / CLK SEL.
1
PULSE SKIP
2
BURST MODE / EXT. CLK
3
4
CCM
4
J1
J1
J2
J3
J10
J11
J12
K1
K2
K3
K4
K9
K10
K11
K12
L1
L2
L3
L4
L5
L8
L9
L10
L11
L12
M1
M2
M3
M4
M5
M6
M7
M8
M9
M10
M11
M12
F6
H8
C6 ,C7,C28
Opt.
1210
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
C30
1uF
35V
VIN
4.5V - 28V
+
150uF
FREQ
VFB2
COMP2
C12
47pF
0603
L6
C13
10pF
0603
C14
Opt.
0603
R4
48.7K
1%
K6
R1
6.34K
1%
J8
R2
2K
C8
C4 ,C5
Opt.
1206
GND
INTVCC
C29
Opt.
0603
J2
35V
Oscon
C2 ,C3
10uF
35V
1206
JP2
FREQUENCY
1
780KHz
2
EXT. CLK
3
4
500KHz
GND
K7
VFB1
COMP1
R3
19.1K
1%
L7
C11
Opt.
0603
C9
Opt.
0603
C10
10pF
0603
SCHEMATIC DIAGRAM
VO1+
E4
MODE_PLLIN
E3
E5
VOUT2
J4
C18,C19
Opt.
1206
C23
C20
22uF
6.3V
1206
C24
VOUT1
VO2+
J3
C15
Opt.
1206
VOUT1
3.3V / 4A
Max
+
Opt.
+
100uF
C21
C22
C16
Opt.
1210
+
100uF
+
Opt.
6.3V
1210
6.3V
Poscap
J6
E7
VOUT2
1.8V / 4A
Max
GND
VO2-
3
GND
J5
6.3V
Poscap
6.3V
1210
C17
22uF
6.3V
1206
3
VO1-
E6
JP3
TRACK1
K8
TRACK1
TRACK2
SW2
RUN2
EXTVCC
J4
J5
pad
H3
U1
LTM4619EV
K5
A10
A11
A12
B10
B11
B12
C10
C11
C12
D10
D11
D12
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT1
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
VOUT2
A1
A2
A3
B1
B2
B3
C1
C2
C3
D1
D2
D3
R6
60.4K
1%
EXT. SIGNAL
VOUT1
TRACK1
H10
SW1
RUN1
PGOOD
J9
H5
C25
0.1uF
0603
pad
E8
SOFT START
1
2
3
SW1
SW2
R7
19.1K
1%
TRACK VOUT1
SOFT START
EXT. SIGNAL
VIN
R9
Opt.
0603
JP4
TRACK2
1
3
5
2
4
6
R5
60.4K
1%
VIN
C26
0.1uF
0603
JP5
RUN2
ON
OFF
R13
Opt.
0603
R12
48.7K
1%
1
2
3
R10
60.4K
1%
E10
R8
48.7K
1%
SGND
R11
Opt.
0603
H6
H7
J6
J7
SGND
SGND
SGND
SGND
E9
JP6
RUN1
ON
TRACK2
INTVCC
OFF
R14
Opt.
0603
A4
A5
A6
A7
A8
A9
PGND
PGND
PGND
PGND
PGND
PGND
1
2
3
2
2
R15
100K
E12
C27
Opt.
0603
EXTVCC
PGOOD
E11
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
H12
H11
H9
H4
H2
H1
G12
G11
G10
G9
G8
G7
G6
G5
G4
G3
G2
G1
VIN
R16
Opt.
0603
INTVCC
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.
B4
B5
B6
B7
B8
B9
C4
C5
C6
C7
C8
C9
D4
D5
D6
D7
D8
D9
E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
E11
E12
F1
F2
F3
F4
F5
F7
F8
F9
F10
F11
F12
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
_
_
For 4.5V < VIN < 5.5V Stuff 0 Ohm
1
Customer Notice
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA. 95035
Phone (408) 432-1900
Fax (408) 434-0507
Title
Size
Date:
www.linear.com
1
LTM4619EV
4.5V - 28V, Dual 4A Step-Down
Document Number
Module
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.
This Circuit Is Proprietary To Linear Technology And
Supplied For Use With Linear Technology Parts.
B
C
D
Demo Circuit 1453A
Wednesday, April 22, 2009
Sheet
E
Rev.
A
1
of
1
A
DEMO MANUAL DC1453A
dc1453af
5
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