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LTM8003 데이터시트(PDF) 14 Page - Linear Technology

부품명 LTM8003
상세설명  40VIN, 3.5A Step-Down Silent Switcher 關Module Regulator
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTM8003 데이터시트(HTML) 14 Page - Linear Technology

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LTM8003
14
8003fc
For more information www.linear.com/LTM8003
PIN FUNCTIONS
GND(Bank1,A1,A6):TietheseGNDpinstoalocalground
plane below the LTM8003 and the circuit components.
In most applications, the bulk of the heat flow out of the
LTM8003 is through these pads, so the printed circuit
design has a large impact on the thermal performance of
the part. See the PCB Layout and Thermal Considerations
sections for more details.
VIN (Bank 2): VIN supplies current to the LTM8003’s in-
ternal regulator and to the internal power switch. These
pins must be locally bypassed with an external, low ESR
capacitor; see Table 1 for recommended values.
VOUT (Bank 3): Power Output Pins. Apply the output filter
capacitor and the output load between these pins and
GND pins.
BIAS (Pins G1, G2): The BIAS pin connects to the internal
power bus. Connect to a power source greater than 3.2V
and less than 18V. If VOUT is greater than 3.2V, connect
this pin there. If the output voltage is less, connect this to a
voltage source above 3.2V. Decouple this pin with at least
1µF if the voltage source for BIAS is remote. If unused or
generating a negative output, tie BIAS to LTM8003 GND.
RUN (Pins B5, B6): Pull the RUN pin below 0.9V to shut
down the LTM8003. Tie to 1.06V or more for normal
operation. If the shutdown feature is not used, tie this
pin to the VIN pin.
RT (Pins A4, A5): The RT pin is used to program the
switchingfrequencyoftheLTM8003byconnectingaresis-
tor from this pin to ground. The Applications Information
section of the data sheet includes a table to determine the
resistancevaluebasedonthedesiredswitchingfrequency.
Minimize capacitance at this pin. Do not drive this pin.
SYNC (Pins A2, B2): External clock synchronization input
and operational mode. This pin programs four different
operating modes:
1. Burst Mode®. Tie this pin to ground for Burst Mode
operationatlowoutputloads—thiswillresultinultralow
quiescent current.
2. Pulse-skipping mode. Float this pin for pulse-skipping
mode. This mode offers full frequency operation down
to low output loads before pulse skipping occurs.
3. Spread spectrum mode. Tie this pin high (between
2.9V and 4.2V) for pulse-skipping mode with spread
spectrum modulation.
4. Synchronizationmode.Drivethispinwithaclocksource
tosynchronizetoanexternalfrequency.Duringsynchro-
nization the part will operate in pulse-skipping mode.
PG (Pin B1, C1): The PG pin is the open-collector output
of an internal comparator. PG remains low until the FB
pin voltage is within about 10% of the final regulation
CISPR25 Class 5 Peak Radiated
DC2416A Demo Board, VOUT = 5V
Spread Spectrum Enabled
CISPR25 Class 5 Average Radiated
DC2416A Demo Board, VOUT = 5V
Spread Spectrum Enabled
fSW = 2MHz
IOUT = 3.5A
FREQUENCY (MHz)
0
200
400
600
800
1000
–10
0
10
20
30
40
50
8053 G91
VERTICAL POLARIZATION
fSW = 2MHz
IOUT = 3.5A
FREQUENCY (MHz)
0
200
400
600
800
1000
–10
0
10
20
30
40
50
8053 G92
TYPICAL PERFORMANCE CHARACTERISTICS T
A = 25°C, unless otherwise noted.


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