ltm4612 Linear Technology Corporation, ltm4612 Datasheet - Page 8

• Manufacturer Part Number: ltm4612
• Description: Ultralow Noise 36vin, 15vout, 5a, Dc/dc ?module
• Manufacturer: Linear Technology Corporation

DECOUPLING REQUIREMENTS
LTM4612
PIN FUNCTIONS
COMP (Pins A11, D11): Current Control Threshold and
Error Amplifi er Compensation Point. The current com-
parator threshold increases with this control voltage. The
voltage ranges from 0V to 2.4V with 0.7V corresponding
to zero sense voltage (zero current).
PGOOD (Pin G12): Output Voltage Power Good Indicator.
Open-drain logic output that is pulled to ground when the
output voltage is not within ±10% of the regulation point,
after a 25μs power bad mask timer expires.
BLOCK DIAGRAM
SYMBOL
C
C
8
IN
OUT
> 1.9V = ON
< 1V = OFF
C
MAX = 5V
5.23k
SS
R
FB
TRACK/SS
MARG1
MARG0
PGOOD
INTV
MPGM
DRV
COMP
SGND
PLLIN
PARAMETER
External Input Capacitor Requirement
(V
External Output Capacitor Requirement
(V
RUN
f
FCB
V
SET
CC
CC
FB
IN
IN
= 20V to 36V, V
= 20V to 36V, V
INTERNAL
COMP
10k
93.1k
OUT
OUT
4.7μF
V
= 12V)
= 12V)
OUT
100k
50k
POWER CONTROL
50k
50k
Figure 1. Simplifi ed Block Diagram
5.1V
ZENER
CONDITIONS
I
I
OUT
OUT
Specifi cations are at T
= 4A
= 4A
RUN (Pins A10, B9): Run Control Pins. A voltage above
1.9V will turn on the module, and below 1V will turn off
the module. A programmable UVLO function can be ac-
complished with a resistor from V
a 5.1V zener to ground. Maximum pin voltage is 5V.
NC (Pins J12, K12, L12): No Connect Pins.
M1
M2
1μF
A
CANCEL-
= 25°C. Use Figure 1 confi guration.
LATION
NOISE
FILTER
INPUT
10μF
MIN
100
10
PGND
+
+
IN
TYP
to this pin that is has
150
C
C
C
OUT
IN
D
V
12V
AT 4A
V
20V TO 36V
V
OUT
IN
D
MAX
UNITS
4612f
μF
μF