ltm4619 Linear Technology Corporation, ltm4619 Datasheet - Page 6

• Manufacturer Part Number: ltm4619
• Description: Dual, 26vin, 4a Dc/dc ?module Regulator
• Manufacturer: Linear Technology Corporation

LTM4619
PIN FUNCTIONS
V
L8 to L12, M1 to M12): Power Input Pins. Apply input
voltage between these pins and PGND pins. Recommend
placing input decoupling capacitance directly between V
pins and PGND pins. For V
together.
V
D1, A2 to D2, A3 to D3): Power Output Pins. Apply output
load between these pins and PGND pins. Recommend
placing output decoupling capacitance directly between
these pins and PGND pins.
PGND (H1, H2, H4, H9, H11, H12, G1 to G12, F1 to
F5, F7 to F12, E1 to E12, D4 to D9, C4 to C9, B4 to B9,
A4 to A9): Power ground pins for both input and output
returns.
INTV
additional decoupling of the 5V internal regulator.
EXTV
EXTV
disabled and external power supplies current to reduce
the power dissipation in the module. This will improve the
effi ciency more at high input voltages.
SGND (J6, J7, H6, H7): Signal Ground Pin. Return ground
path for all analog and low power circuitry. Tie a single
connection to PGND in the application.
MODE/PLLIN (H8): Mode selection or external synchroniza-
tion pin. Tying this pin high enables pulse-skipping mode.
Tying this pin low enables force continuous operation.
Floating this pin enables Burst Mode operation. A clock
on the pin will force the controller into continuous mode
of operation and synchronize the internal oscillator. The
external clock input high threshold is 1.6V, while the input
low threshold is 1V.
6
IN
OUT1
(J1 to J3, J10 to J12, K1 to K4, K9 to K12, L1 to L5,
CC
CC
CC
, V
(F6): Internal 5V Regulator Output. This pin is for
(J4): External Power Input to Controller. When
is higher than 4.7V, the internal 5V regulator is
OUT2
(A10 to D10, A11 to D11, A12 to D12, A1 to
IN
< 5.5, tie V
IN
and INTV
CC
IN
FREQ/PLLFLTR (J8): Frequency Selection Pin. An internal
lowpass fi lter is tied to this pin. The frequency can be se-
lected from 250kHz to 780kHz by varying the DC voltage
on this pin from 0V to 2.4V. Leave this pin fl oating when
external synchronization is used.
TK/SS1, TK/SS2 (K8, K5): Output Voltage Tracking and
Soft-Start Pins. Internal soft-start currents of 1.3μA charge
the soft-start capacitors. See the Applications Information
section to use the tracking function.
V
amplifi er. Internally, this pin is connected to V
a 60.4k precision resistor. Different output voltages can
be programmed with an additional resistor between V
and SGND pins. See the Applications Information section
for details.
COMP1, COMP2 (L7, L6): Current Control Threshold and
Error Amplifi er Compensation Point. The module has been
internally compensated for most I/O ranges.
PGOOD (H5): Output Voltage Power Good Indicator. Open
drain logic output that is pulled to ground when the output
voltage is not within ±7.5% of the regulation point.
RUN1, RUN2 (J9, J5): Run Control Pins. 0.5μA pull-up
currents on these pins turn on the module if these pins
are fl oating. Forcing either of these pins below 1.2V will
shut down the corresponding outputs. An additional 4.5μA
pull-up current is added to this pin, once the RUN pin rises
above 1.2V. Also, active control or pull-up resistors can
be used to enable the RUN pin. The maximum voltage is
6V on these pins.
SW1, SW2 (H10, H3): Switching Test Pins. These pins are
provided externally to check the operation frequency.
FB1
, V
FB2
(K7, K6): The negative input of the error
OUT
with
4619f
FB