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LTC3602 Fiches technique(PDF) 18 Page - Linear Technology

No de pièce LTC3602
Description  Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator
PDF  28 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LTC3602 Fiches technique(HTML) 18 Page - Linear Technology

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LTC3633A-2/LTC3633A-3
18
3633a23f
APPLICATIONS INFORMATION
Upon start-up, the regulator defaults to Burst Mode opera-
tion until the output exceeds 80% of its final value (VFB >
0.48V). Once the output reaches this voltage, the operating
mode of the regulator switches to the mode selected by
the MODE/SYNC pin as described above. During normal
operation, if the output drops below 10% of its final value
(as it may when tracking down, for instance), the regula-
tor will automatically switch to Burst Mode operation to
prevent inductor saturation and improve TRACKSS pin
accuracy.
Output Power Good
The PGOOD output of the LTC3633A-2 is driven by a 20Ω
(typical) open-drain pull-down device. This device will be
turned off once the output voltage is within 5% (typical) of
the target regulation point, allowing the voltage at PGOOD
to rise via an external pull-up resistor. If the output voltage
exits an 8% (typical) regulation window around the target
regulation point, the open-drain output will pull down
with 20Ω output resistance to ground, thus dropping the
PGOOD pin voltage. This behavior is described in Figure 7.
Figure 7. PGOOD Pin Behavior
PGOOD
VOLTAGE
OUTPUT VOLTAGE
NOMINAL OUTPUT
0%
8%
–5%
5%
3633a23 F07
–8%
R3
R1
R4
R2
R3
VOUT2
R4
(6a) Coincident Tracking Setup
TO
VFB1
PIN
TO
TRACKSS2
PIN
TO
VFB2
PIN
VOUT1
R1
R2
R3
VOUT2
R4
3633a23 F06b
3633a23 F06a
(6b) Ratiometric Tracking Setup
TO
VFB1
PIN
TO
TRACKSS2
PIN
TO
VFB2
PIN
VOUT1
Figure 6. Setup for Coincident and Ratiometric Tracking
A filter time of 40μs (typical) acts to prevent unwanted
PGOOD output changes during VOUT transient events.
As a result, the output voltage must be within the target
regulation window of 5% for 40μs before the PGOOD pin
pulls high. Conversely, the output voltage must exit the
8% regulation window for 40μs before the PGOOD pin
pulls to ground.
TIME
(5a) Coincident Tracking
VOUT1
VOUT2
3633a23 F05a
VOUT1
VOUT2
TIME
3633a23 F05b
(5b) Ratiometric Tracking
Figure 5. Two Different Modes of Output Voltage Tracking



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