參數(shù)資料
型號(hào)： LTM4600IV
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 17 A SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, BGA104
封裝： 15 X 15 MM, 2.8 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-104
文件頁(yè)數(shù)： 21/24頁(yè)
文件大?。?/td> 351K
代理商： LTM4600IV
PRERELEASE
LTM4600
6
4600p
PI FU CTIO S
UU
U
VIN (Bank 1): Power Input Pins. Apply input voltage
between these pins and GND pins. Recommend placing
input decoupling capacitance directly between VIN pins
and GND pins.
FADJ (Pin A15): An internal resistor from VIN to this pin
sets the one-shot timer current, thereby setting the switch-
ing frequency.
SVIN (Pin A17): Supply Pin for Internal PWM Controller.
Leave this pin open or add additional decoupling capaci-
tance.
EXTVCC (Pin A19): External 5V supply pin for controller.
If left open, the internal 5V linear regulator will power the
controller and MOSFET drivers. For high input voltage
applications, connecting this pin to an external 5V will
reduce the power loss in the power module. The EXTVCC
voltage should never be higher than VIN.
VOSET (Pin A21): The Negative Input of The Error Am-
plier. Internally, this pin is connected to VOUT with a
100k precision resistor. Different output voltages can be
programmed with additional resistors between the VOSET
and SGND pins.
COMP (Pin B23): Current Control Threshold and Error
Amplier Compensation Point. The current comparator
threshold increases with this control voltage. The voltage
ranges from 0V to 2.4V with 0.8V corresponding to zero
sense voltage (zero current).
SGND (Pin D23): Signal Ground Pin. All small-signal
components should connect to this ground, which in turn
connects to PGND at one point.
RUN/SS (Pin F23): Run and Soft-Start Control. Forcing
this pin below 0.8V will shut down the power supply.
Inside the power module, there is a 1000pF capacitor
which provides approximately 0.7ms soft-start time with
200F output capacitance. Additional soft-start time can
be achieved by adding additional capacitance between
the RUN/SS and SGND pins. The internal short-circuit
latchoff can be disabled by adding a resistor between this
pin and the VIN pin. This resistor must supply a minimum
5A pull up current.
FCB (Pin G23): Forced Continuous Input. Grounding this
pin enables forced continuous mode operation regardless
of load conditions. Tying this pin above 0.63V enables
discontinuous conduction mode to achieve high efciency
operation at light loads. There is an internal 4.75K resistor
between the FCB and SGND pins.
PGOOD (Pin J23): Output Voltage Power Good Indicator.
When the output voltage is within 10% of the nominal
voltage, the PWRGD is open drain output. Otherwise, this
pin is pulled to ground.
PGND (Bank 2): Power ground pins for both input and
output returns.
VOUT (Bank 3): Power Output Pins. Apply output load
between these pins and GND pins. Recommend placing
High Frequency output decoupling capacitance directly
between these pins and GND pins.
(See Package Description for Pin Assignment)
E
C
A
RUN/SS
FCB
PGOOD
VIN
BANK 1
PGND
BANK 2
VOUT
BANK 3
COMP
SGND
EXTV
CC
V
OSET
F
ADJ
SV
IN
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4600 PN01
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