LTM4601 LINER [Linear Technology], LTM4601 Datasheet - Page 8

• Manufacturer Part Number: LTM4601
• Description: 12A DC/DC ?Modules with PLL, Output Tracking and Margining
• Manufacturer: LINER [Linear Technology]

SI PLIFIED
LTM4601/LTM4601-1
MARG0 (Pin C12): This pin is the LSB logic input for the
margining function. Together with the MARG1 pin will
determine if margin high, margin low or no margin state
is applied. The pin has an internal pull-down resistor of
50k. See Applications Information.
MARG1 (Pin D12): This pin is the MSB logic input for the
margining function. Together with the MARG0 pin will
determine if margin high, margin low or no margin state
is applied. The pin has an internal pull-down resistor of
50k. See Applications Information.
SGND (Pin H12): Signal Ground. This pin connects to
PGND at output capacitor point.
COMP (Pin A11): Current Control Threshold and Error
Amplifi er Compensation Point. The current comparator
threshold increases with this control voltage. The voltage
ranges from 0V to 2.4V with 0.7V corresponding to zero
sense voltage (zero current).
PI FU CTIO S
8
W
U
U
C
40.2k
<0.9V = OFF
R
MAX = 5V
SS
>2V = ON
SET
BLOCK DIAGRA
U
TRACK/SS
V
OUT_LCL
MARG1
MARG0
PGOOD
INTV
MPGM
DRV
COMP
SGND
PLLIN
RUN
f
V
SET
CC
CC
(See Package Description for Pin Assignment)
FB
INTERNAL
Figure 1. Simplifi ed LTM4601/LTM4601-1 Block Diagram
COMP
39.2k
4.7µF
60.4k
(50Ω, LTM4601-1)
W
50k
1M
POWER CONTROL
50k
50k
V
OUT
5.1V
ZENER
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.
RUN (Pin A10): Run Control Pin. A voltage above 1.9V
will turn on the module, and when below 1.9V, will turn
off the module. A programmable UVLO function can be
accomplished with a resistor from V
a 5.1V zener to ground. Maximum pin voltage is 5V. Limit
current into the RUN pin to less than 1mA.
V
to bypass the remote sense amplifi er, or DIFFV
nects to this pin when remote sense amplifi er is used.
V
V
LTM4601-1.
OUT_LCL
OUT_LCL
OUT
is internally connected to V
10k
can be connected to V
(Pin L12): V
INTV
CC
–
+
Q1
Q2
10k
10k
22µF
1.5µF
10k
OUT
connects directly to this pin
PGND
V
V
DIFFV
C
+
OSNS
OSNS
OUT
4601 F01
OUT
+
–
+
C
OUT_LCL
IN
OUT
V
4.5V TO 20V
V
1.5V
12A
IN
OUT
IN
on the LTM4601-1,
to this pin that has
NOT INCLUDED
IN THE LTM4601-1
V
V
DIFFV
OSNS
OSNS
with 50Ω in the
OUT
–
+
= NC1
= NC2
= NC3
OUT
con-
4601f