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LTM4600HV
APPLICATIO S I FOR ATIO
Enable
The RUN/SS pin can be driven from logic as shown in Figure
5. This function allows the LTM4600HV to be turned on or
off remotely. The ON signal can also control the sequence
of the output voltage.
RUN/SS
EXTV CC Connection
An internal low dropout regulator produces an internal 5V
supply that powers the control circuitry and FET drivers.
Therefore, if the system does not have a 5V power rail,
the LTM4600HV can be directly powered by V IN . The gate
driver current through LDO is about 18mA. The internal
LDO power dissipation can be calculated as:
ON
2N7002
LTM4600HV
PGND SGND
4600hv F05
P LDO_LOSS = 18mA ? (V IN – 5V)
The LTM4600HV also provides an external gate driver
voltage pin EXTV CC . If there is a 5V rail in the system, it
is recommended to connect EXTV CC pin to the external
Figure 5. Enable Circuit with External Logic
Output Voltage Tracking
For the applications that require output voltage tracking,
several LTM4600HV modules can be programmed by the
power supply tracking controller such as the LTC2923.
Figure 6 shows a typical schematic with LTC2923. Coin-
cident, ratiometric and offset tracking for V O rising and
falling can be implemented with different sets of resistor
values. See the LTC2923 data sheet for more details.
5V rail. Whenever the EXTV CC pin is above 4.7V, the in-
ternal 5V LDO is shut off and an internal 50mA P-channel
switch connects the EXTV CC to internal 5V. Internal 5V is
supplied from EXTV CC until this pin drops below 4.5V. Do
not apply more than 6V to the EXTV CC pin and ensure that
EXTV CC < V IN . The following list summaries the possible
connections for EXTV CC :
1. EXTV CC grounded. Internal 5V LDO is always powered
from the internal 5V regulator.
2. EXTV CC connected to an external supply. Internal LDO
V IN
5V
DC/DC
Q1
3.3V
is shut off. A high ef?ciency supply compatible with the
MOSFET gate drive requirements (typically 5V) can im-
prove overall ef?ciency. With this connection, it is always
V IN
V IN
required that the EXTV CC voltage can not be higher than
V IN pin voltage.
R ONB
V CC
ON
GATE
RAMP
FB1
LTM4600HV
V OSET V OUT
1.8V
3. EXTV CC is recommended for V IN > 20V
R ONA
LTC2923
49.9k
Discontinuous Operation and FCB Pin
R TB1
RAMPBUF
TRACK1
STATUS
SDO
V IN
V IN
The FCB pin determines whether the internal bottom
MOSFET remains on when the current reverses. There is
R TA1
R TB2
R TA2
TRACK2
GND
FB2
LTM4600HV
V OSET V OUT
66.5k
1.5V
an internal 4.75k pull-down resistor connecting this pin
to ground. The default light load operation mode is forced
continuous (PWM) current mode. This mode provides
4600hv F06
minimum output voltage ripple.
Figure 6. Output Voltage Tracking with the LTC2923 Controller
4600hvfc
13
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