LTM4600HVEV#PBF Linear Technology, LTM4600HVEV#PBF Datasheet - Page 18

• Manufacturer Part Number: LTM4600HVEV#PBF
• Description: IC DC/DC UMODULE 10A 104-LGA
• Manufacturer: Linear Technology
• Series: µModuler
• Type: Point of Load (POL) Non-Isolatedr

Specifications of LTM4600HVEV#PBF

• Design Resources: LTM4600HV Spice Model
• Output: 0.6 ~ 5 V
• Number Of Outputs: 1
• Power (watts): 50W
• Mounting Type: Surface Mount
• Voltage - Input: 4.5 ~ 28 V
• Package / Case: 104-LGA
• 1st Output: 0.6 ~ 5 VDC @ 10A
• Size / Dimension: 0.59" L x 0.59" W x 0.11" H (15mm x 15mm x 2.8mm)
• Power (watts) - Rated: 50W
• Operating Temperature: -40°C ~ 85°C
• Efficiency: 92%
• Dc To Dc Converter Type: Step Down
• Pin Count: 104
• Input Voltage: 28V
• Output Voltage: 0.6 to 5V
• Switching Freq: 850KHz
• Output Current: 10A
• Package Type: LGA
• Output Type: Adjustable
• Switching Regulator: Yes
• Mounting: Surface Mount
• Input Voltage (min): 4.5V
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• 3rd Output: -
• 2nd Output: -
• Lead Free Status / Rohs Status: Compliant

APPLICATIO S I FOR ATIO
LTM4600HV
t
band.
Using the frequency = (I
I
calculated from 12V input was 103μA, so a resistor from
f
57μA, sets the adequate I
range for the higher duty cycle conversion of 12V to
5V. Input voltage range is limited to 9V to 16V. Higher
input voltages can be used without the 15k on f
inductor ripple current gets too high above 16V, and the
400ns minimum off-time is limited below 9V.
Equations for setting frequency for 5V to 3.3V:
18
ON
ON
ADJ
t
t
I
frequency = (I
DC = duty cycle, duty cycle is (V
t
switching period; t
ON
OFF
ON
S
and t
= (1MHz • 2.4V • 10pF) • (1/0.41) ≅ 58μA. I
to ground = (0.7V/15k) = 46μA. 103μA – 46μA =
= t
= 0.41 • 1μs ≅ 410ns
= (V
= 1μs – 410ns ≅ 590ns
OFF
ON
IN
+ t
are above the minimums with adequate guard
– 0.7V)/110k; I
OFF
, t
ON
U
ON
/[2.4V • 10pF]) • DC = 1.07MHz;
S
= on-time, t
= 1/frequency
ON
ON
5V TO 3.3V AT 8A WITH f
LTM4600HV MINIMUM ON-TIME = 100ns
LTM4600HV MINIMUM OFF-TIME = 400ns
U
/[2.4V • 10pF]) • DC, solve for
RUN/SOFT-START
C3
10μF
25V
current for proper frequency
ON
= 39μA
4.5V TO 7V
C1
10μF
25V
OUT
W
OFF
/V
= off-time of the
ADJ
IN
= 30.1k
)
EXTV
FCB
RUN/SS
COMP
CC
ON
SGND
U
V
LTM4600HV
IN
ADJ
current
. The
5V to 3.3V at 8A
PGND
f
ADJ
PGOOD
V
V
30.1k
OSET
SV
C1, C3: TDK C3216X5R1E106MT
C2: TAIYO YUDEN, JMK316BJ226ML
C4: SANYO POSCAP, 6TPE330MIL
4600 F22
OUT
R1
IN
t
~450kHz frequency or 2.22μs period is chosen for 5V to
3.3V. Frequency range is about 450kHz to 650kHz from
4.5V to 7V input.
t
band.
Using the frequency = (I
I
calculated from 5V input was 39μA, so a resistor from f
to ground = (0.7V/30.1k) = 23μA. 39μA – 23μA = 16μA,
sets the adequate I
for the higher duty cycle conversion of 5V to 3.3V. Input
voltage range is limited to 4.5V to 7V. Higher input voltages
can be used without the 30.1k on f
current gets too high above 7V, and the 400ns minimum
off-time is limited below 4.5V.
OFF
ON
ON
t
t
t
ON
ON
OFF
and t
= (450kHz • 2.4V • 10pF) • (1/0.66) ≅ 16μA. I
OPEN DRAIN
must be greater than 400ns, or t
= DC • t
= 0.66 • 2.22μs ≅ 1.46μs
= 2.22μs – 1.46μs ≅ 760ns
OFF
C5
100pF
are above the minimums with adequate guard
3.3V AT 8A
R2
22.1k
1%
S
ON
C2
22μF
EFFICIENCY = 94%
current for proper frequency range
ON
+
/[2.4V • 10pF]) • DC, solve for
C4
330μF
6.3V
ADJ
. The inductor ripple
S
– t
ON
> 400ns.
ON
current
4600hvfc
ADJ