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LTM4600HVMPV#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
LTM4600HV
10
4600hvfe
For more information www.linear.com/LTM4600HV
down when Q
DOWN
is on and Q
UP
is off. If the output
voltage V
O
needs to be margined up/down by ±M%, the
resistor values of R
UP
and R
DOWN
can be calculated from
the following equations:
(R
SET
R
UP
) • V
O
•(1
+
M%)
(R
SET
R
UP
)+100kΩ
= 0.6V
R
SET
• V
O
•(1– M%)
R
SET
+(100kΩ R
DOWN
)
= 0.6V
Input Capacitors
The LTM4600HV µModule should be connected to a low
ac-impedance DC source. High frequency, low ESR input
capacitors are required to be placed adjacent to the mod
-
ule. In Figure 21, the bulk input capacitor C
IN
is selected
for its ability to handle the large RMS current into the
converter. For a buck converter, the switching duty-cycle
can be estimated as:
D =
V
O
V
IN
Without considering the inductor current ripple, the RMS
current of the input capacitor can be estimated as:
I
CIN(RMS)
=
I
O(MAX)
η%
• D • (1−D)
In the above equation, η% is the estimated efficiency of
the power module. C1 can be a switcher-rated electrolytic
aluminum capacitor, OS-CON capacitor or high volume
ceramic capacitors. Note the capacitor ripple current
ratings are often based on only 2000 hours of life. This
makes it advisable to properly derate the input capacitor,
or choose a capacitor rated at a higher temperature than
required. Always contact the capacitor manufacturer for
derating requirements over temperature.
In Figure 21, the input capacitors are used as high fre
-
quency input
decoupling capacitors. In a typical 10A
output application, 1-2 pieces of very low ESR X5R or
X7R (for extended temperature range), 10µF ceramic
capacitors are recommended. This decoupling capacitor
should be placed directly adjacent the module input pins
The typical LTM4600HV application circuit is shown in
Figure 21. External component selection is primarily de
-
termined by t
he maximum load current and output voltage.
Output Voltage Programming and Margining
The PWM controller of the LTM4600HV has an internal
0.6V±1% reference voltage. As shown in the block dia
-
gram, a 100
k/0.5% internal feedback resistor connects
V
OUT
and V
OSET
pins. Adding a resistor R
SET
from V
OSET
pin to SGND pin programs the output voltage:
V
O
= 0.6V •
100k
+
R
SET
R
SET
Table 1 shows the standard values of 1% R
SET
resistor
for typical output voltages:
Table 1.
R
SET
(kΩ)
Open 100 66.5 49.9 43.2 31.6 22.1 13.7
V
O
(V)
0.6 1.2 1.5 1.8 2 2.5 3.3 5
Voltage margining is the dynamic adjustment of the output
voltage to its worst case operating range in production
testing to stress the load circuitry, verify control/protec
-
tion functionality of the board and improve the system
reliability. Figure 2 shows how to implement margining
function with the LTM4600HV. In addition to the feedback
resistor R
SET
, several external components are added.
Turn off both transistor Q
UP
and Q
DOWN
to disable the
margining. When Q
UP
is on and Q
DOWN
is off, the output
voltage is margined up. The output voltage is margined
Figure 2. LTM4600HV Margining Implementation
PGND SGND
4600hv F02
LTM4600HV
V
OUT
V
OSET
R
SET
R
UP
Q
UP
100k
2N7002
R
DOWN
Q
DOWN
2N7002
applicaTions inForMaTion
LTM4600HV
11
4600hvfe
For more information www.linear.com/LTM4600HV
in the PCB layout to minimize the trace inductance and
high frequency AC noise.
Output Capacitors
The LTM4600HV is designed for low output voltage ripple.
The bulk output capacitors C
OUT
is chosen with low enough
effective series resistance (ESR) to meet the output voltage
ripple and transient requirements. C
OUT
can be low ESR
tantalum capacitor, low ESR polymer capacitor or ceramic
capacitor (X5R or X7R). The typical capacitance is 200µF
if all ceramic output capacitors are used. The internally
optimized loop compensation provides sufficient stability
margin for all ceramic capacitors applications. Additional
output filtering may be required by the system designer,
if further reduction of output ripple or dynamic transient
spike is required. Refer to Table 2 for an output capaci
-
tance matrix for each output voltage droop, peak to peak
deviation and recovery time during a 5A/µs transient with
a specific output capacitance.
Fault Conditions: Current Limit and Over current
Foldback
The LTM4600HV has a current mode controller, which
inherently limits the cycle-by-cycle inductor current not
only in steady state operation, but also in transient.
To further limit current in the event of an over load condition,
the LTM4600HV provides foldback current
limiting. If the
output voltage falls by more than 50%, then the maximum
output current is progressively lowered to about one sixth
of its full current limit value.
V
IN
to V
OUT
Step-Down Ratios
There are restrictions in the maximum V
IN
to V
OUT
step
down ratio that can be achieved for a given input voltage.
These constraints are shown in V
IN
to V
OUT
Step-Down
Ratio in the Typical Performance Characteristics section.
Note that additional thermal derating may apply. See the
Thermal Considerations and Output Current Derating sec
-
tions of this data sheet.
Soft-Start and Latchoff with the RUN/SS pin
The
RUN/SS pin provides a means to shut down the
LTM4600HV as well as a timer for soft-start and over-
current latchoff. Pulling the RUN/SS pin below 0.8V puts
the LTM4600HV into a low quiescent current shutdown
(I
Q
≤ 75µA). Releasing the pin allows an internal 1.2µA
current source to charge up the timing capacitor C
SS
.
Inside LTM4600HV, there is an internal 1000pF capacitor
from RUN/SS pin to ground. If RUN/SS pin has an external
capacitor C
SS_EXT
to ground, the delay before starting is
about:
t
DELAY
=
1.5V
1.2µA
•(C
SS _ EXT
+1000pF)
When the voltage on RUN/SS pin reaches 1.5V, the
LTM4600HV internal switches are operating with a clamp-
ing of
the maximum output inductor current limited by
the
RUN/SS pin total soft-start capacitance. As the RUN/
SS pin voltage rises to 3V, the soft-start clamping of the
inductor current is released.
applicaTions inForMaTion
LTM4600HV
12
4600hvfe
For more information www.linear.com/LTM4600HV
Table 2. Output Voltage Response Versus Component Matrix *(Refer to Figure 21)
TYPICAL MEASURED VALUES
C
OUT1
VENDORS PART NUMBER C
OUT2
VENDORS PART NUMBER
TDK C4532X5R0J107MZ (100µF,6.3V) SANYO POSCAP 6TPE330MIL (330µF, 6.3V)
TAIYO YUDEN JMK432BJ107MU-T ( 100µF, 6.3V) SANYO POSCAP 2R5TPE470M9 (470µF, 2.5V)
TAIYO YUDEN JMK316BJ226ML-T501 ( 22µF, 6.3V) SANYO POSCAP 4TPE470MCL (470µF, 4V)
TAIYO YUDEN JMK316BJ226ML-T501 ( 22µF, 6.3V) SANYO POSCAP 6TPD470M (470µF, 6.3V)
V
OUT
(V)
C
IN
(CERAMIC)
C
IN
(BULK)
C
OUT1
(CERAMIC)
C
OUT2
(BULK)
C
COMP
C3 V
IN
(V)
DROOP
(mV)
PEAK
TO PEAK
(mV)
RECOVER
Y TIME
(µs)
LOAD
STEP
(A/µs)
1.2
2
× 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 5 35 68 25 5
1.2 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 2.5V NONE 100pF 5 35 70 20 5
1.2 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 5 40 80 20 5
1.2 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 5 49 98 20 5
1.2 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 12 35 68 25 5
1.2 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 2.5V NONE 100pF 12 35 70 20 5
1.2 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 12 40 80 20 5
1.2 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 12 49 98 20 5
1.5 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 5 36 75 25 5
1.5 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 2.5V NONE 100pF 5 37 79 20 5
1.5 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 5 44 84 20 5
1.5 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 5 61 118 20 5
1.5 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 12 36 75 25 5
1.5 2 × 10µF 35V 150µF 35V 1 × 100µ
F 6.3V 470µF 2.5V
NONE 100pF 12 37 79 20 5
1.5 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 12 44 89 20 5
1.5 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 12 54 108 20 5
1.8 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 5 40 81 30 5
1.8 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 2.5V NONE 100pF 5 44 88 20 5
1.8 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 5 46 91 20 5
1.8 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 5 62 128 20 5
1.8 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 12 40 81 30 5
1.8 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 2.5V NONE 100pF 12 44 85 20 5
1.8 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 12 44 91 20 5
1.8 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 12 62 125 20 5
2.5 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 4V NONE 100pF 5 48 103 30 5
2.5 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 5 56 113 30 5
2.5 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 5 57 116 30 5
2.5 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 5 60 115 25 5
2.5 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 4V NONE 100pF 12 48 103 30 5
2.5 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 12 51
102 30 5
2.5 2 × 10µF 35V
150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 12 56 113 30 5
2.5 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 12 70 159 25 5
2.5 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 6.3V NONE 100pF 24 56 112 30 5
2.8 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 6.3V NONE 100pF 24 50 100 30 5
3.3 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 7 64 126 30 5
3.3 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 4V NONE 100pF 7 66 132 30 5
3.3 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 7 82 166 35 5
3.3 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 7 100 200 25 5
3.3 2 × 10µF 35V 150µF 35V 1 × 100µF 6.3V 470µF 4V NONE 100pF 12 52 106 30 5
3.3 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 4V NONE 100pF 12 64 129 35 5
3.3 2 × 10µF 35V 150µF 35V 2 × 100µF 6.3V 330µF 6.3V NONE 100pF 12 64 126 30 5
3.3 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 12 76 144 25 5
3.3 2 × 10µF 35V 150µF 35V 3 × 22µF 6.3V 470µF 6.3V NONE 100pF 24 74 149 30 5
5 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 15 188 375 25 5
5 2 × 10µF 35V 150µF 35V 4 × 100µF 6.3V NONE NONE 100pF 20 159 320 25 5
*X7R is recommended for extended temperature range.
applicaTions inForMaTion
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LTM4600HVMPV#PBF

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Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 28V, 10A Step-down Module Regulator
Lifecycle:
New from this manufacturer.
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