LTM4632
4
4632fb
For more information www.linear.com/LTM4632
Note 1. Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2. The LTM4632 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTM4632E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM4632I is guaranteed to meet specifications over the
full –40°C to 125°C internal operating temperature range. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal resistance and other environmental
factors.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications that apply over the specified internal
operating temperature range (Note 2). Specified as each individual output channel at T
A
= 25°C (Note 2), V
IN
= 12V, unless otherwise
noted, per the typical application in Figure 19
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Control Section
V
FB1
Voltage at V
FB1
Pin I
OUT
= 0A, V
OUT1
= 1.3V
l
0.593 0.600 0.607 V
I
FB1
Current at V
FB1
Pin (Note 4) ±30 nA
RFBHI1 Resistor Between V
OUT1
and
V
FB1
Pins
60.00 60.40 60.80 kΩ
VTTR VTTR Voltage Reference V
DDQIN
= 1.3V,
IVTTR = ±10mA, CVTTR < 10nF
l
0.492x
V
DDQIN
0.50x
V
DDQIN
0.508x
V
DDQIN
V
V
RUN1
, V
RUN2
RUN Pin On Threshold RUN Threshold Rising
RUN Threshold Falling
1.18
0.95
1.28
1.01
1.39
1.05
V
V
I
RUN1
, I
RUN2
RUN Pin Leakage Current 0 ±1 µA
I
TRACK/SS1
TRACK/SS1 Pin Soft-Start Pull-Up
Current
TRACK/SS1 = 0V 1.2 µA
t
ON(MIN)
Minimum On-Time (Note 4) 20 ns
t
OFF(MIN)
Minimum Off-Time (Note 4) 45 ns
VPGOOD PGOOD Trip Level V
FB
With Respect to 0.6V
V
OUT2
With Respect to V
DDQIN
/2 (Note 4)
Ramping Negative
Ramping Positive
–8
8
–14
14
%
%
RPGOOD PGOOD Pull-Down Resistance 1mA Load 15 Ω
V
INTVCC
Internal V
CC
Voltage V
IN
= 3.6V to 15V 3.1 3.3 3.5 V
V
INTVCC
Load Reg INTV
CC
Load Regulation I
CC
= 0 to 50mA 1.3 %
f
OSC
Oscillator Frequency 1 MHz
SYNC SYNC Threshold Voltage 0.95 V
I
SYNC/MODE
MODE Input Current SYNC/MODE = INTV
CC
–1.5 µA
Note 3. See output current derating curves for different V
IN
, V
OUT
and T
A
.
Note 4. 100% tested at wafer level.
Note 5. This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
