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LTM4602 Datasheet(PDF) 6 Page - Linear Technology

Part # LTM4602
Description  6A High Effi ciency DC/DC 關Module
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

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LTM4602
6
4602fa
VIN (Bank 1): Power Input Pins. Apply input voltage be-
tween these pins and PGND pins. Recommend placing
input decoupling capacitance directly between VIN pins
and PGND pins.
fADJ (Pin A15): A 110k resistor from VIN to this pin sets
the one-shot timer current, thereby setting the switching
frequency. The LTM4602 switching frequency is typically
850kHz. An external resistor to ground can be selected to
reduce the one-shot timer current, thus lower the switching
frequency to accommodate a higher duty cycle step down
requirement. See the applications section.
SVIN(PinA17):SupplyPinforInternalPWMController.Leave
this pin open or add additional decoupling capacitance.
EXTVCC (Pin A19): External 5V supply pin for controller. If
left open or grounded, 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 Amplifier.
Internally,thispinisconnectedtoVOUTwitha100kprecision
resistor. Different output voltages can be programmed with
additional resistors between the VOSET and SGND pins.
COMP (Pin B23): Current Control Threshold and Error
Amplifier 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
200μF 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 pullup resistor must supply a minimum
5μA 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 efficiency
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 PGOOD 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 PGND pins. Recommend placing
High Frequency output decoupling capacitance directly
between these pins and PGND 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
TOP VIEW
35
24
79
68
11
13
10
12
15
17
14
16
19
21
18
20
22
1
23
B
D
F
G
H
J
L
M
N
P
R
T
K
4602 PN01
PIN FUNCTIONS


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