LTM4605EV#PBF Linear Technology, LTM4605EV#PBF Datasheet - Page 12
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LTM4605EV#PBF
Manufacturer Part Number
LTM4605EV#PBF
Description
IC DC/DC UMODULE 5A 141-LGA
Manufacturer
Linear Technology
Series
µModuler
Type
Point of Load (POL) Non-Isolatedr
Datasheet
1.LTM4605EVPBF.pdf
(26 pages)
Specifications of LTM4605EV#PBF
Design Resources
LTM4605 Spice Model
Output
0.8 ~ 16 V
Number Of Outputs
1
Power (watts)
80W
Mounting Type
Surface Mount
Voltage - Input
4.5 ~ 20V
Package / Case
141-LGA
1st Output
0.8 ~ 16 VDC @ 5A
Size / Dimension
0.59" L x 0.59" W x 0.11" H (15mm x 15mm x 2.8mm)
Power (watts) - Rated
80W
Operating Temperature
-40°C ~ 85°C
Efficiency
98%
Dc To Dc Converter Type
Non-Inverting/Inverting/Step Up/Step Down
Pin Count
141
Input Voltage
20V
Output Voltage
0.8 to 16V
Switching Freq
170 TO 440KHz
Output Current
12/5A
Package Type
LGA
Output Type
Adjustable
Switching Regulator
Yes
Load Regulation
0.5%
Line Regulation
0.02%
Mounting
Surface Mount
Input Voltage (min)
4.5V
Operating Temperature Classification
Industrial
No. Of Outputs
1
Supply Voltage Range
4.5V To 20V
No. Of Pins
141
Operating Temperature Range
-40°C To +85°C
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
3rd Output
-
2nd Output
-
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
APPLICATIONS INFORMATION
LTM4605
R
R
Since the maximum inductor valley current at buck mode
is much lower than the inductor peak current at boost
mode, different sensing resistors are suggested to use
in buck and boost modes.
The current comparator threshold sets the peak of the
inductor current in boost mode and the maximum inductor
valley current in buck mode. In boost mode, the allowed
maximum average load current is:
where ΔI
In buck mode, the allowed maximum average load cur-
rent is:
The maximum current sensing R
mode is:
The maximum current sensing R
mode is:
A 20% to 30% margin on the calculated sensing resistor is
usually recommended. Please refer to Table 3 for the rec-
ommended sensing resistors for different applications.
Soft-Start
The SS pin provides a means to soft-start the regulator.
A capacitor on this pin will program the ramp rate of the
output voltage. A 1.7μA current source will charge up the
external soft-start capacitor. This will control the ramp of
12
SENSE
SENSE
I
I
R
R
2 • I
OUT(MAX,BOOST)
OUT(MAX,BUCK)
SENSE(MAX,BOOST)
SENSE(MAX,BUCK)
OUT(MAX,BOOST)
is chosen based on the required inductor current.
Selection and Maximum Output Current
L
is peak-to-peak inductor ripple current.
2 • 160mV • V
=
=
R
130mV
=
⎛
⎜
⎝
SENSE
=
• V
160mV
R
2 • I
SENSE
OUT
OUT(MAX,BUCK)
IN
+
+ ΔI
2 • 130mV
ΔI
−
2
SENSE
SENSE
L
ΔI
L
2
• V
L
⎞
⎟ •
⎠
IN
value for the boost
value for the buck
V
V
OUT
– ΔI
IN
L
the internal reference and the output voltage. The total
soft-start time can be calculated as:
When the RUN pin falls below 1.6V, then soft-start pin is
reset to allow for proper soft-start control when the regula-
tor is enabled again. Current foldback and force continuous
mode are disabled during the soft-start process. The soft-
start function can also be used to control the output ramp
up time, so that another regulator can be easily tracked.
Do not apply more than 6V to the SS pin.
Run Enable
The RUN pin is used to enable the power module. The pin
can be driven with a logic input, and not exceed 6V.
The RUN pin can also be used as an undervoltage lockout
(UVLO) function by connecting a resistor from the input
supply to the RUN pin. The equation:
Power Good
The PGOOD pin is an open drain pin that can be used to
monitor valid output voltage regulation. This pin monitors
a ±7.5% window around the regulation point, and tracks
with margining.
COMP Pin
This pin is the external compensation pin. The module
has already been internally compensated for most output
voltages. A spice model is available for other control loop
optimization.
Fault Conditions: Current Limit and Overcurrent
Foldback
LTM4605 has a current mode controller, which inherently
limits the cycle-by-cycle inductor current not only in steady
state operation, but also in transient. Refer to Table 3.
To further limit current in the event of an overload condi-
tion, the LTM4605 provides foldback current limiting. If the
t
V _UVLO =
SOFTSTART
=
R + 100k
2.4V • C
100k
1.7μA
• 1.6V
SS
4605fc