LTC1628IG Linear Technology, LTC1628IG Datasheet - Page 28

• Manufacturer Part Number: LTC1628IG
• Description: IC SW REG STEP-DOWN 28-SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1628IG

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: Adj to 0.8V
• Current - Output: 3A
• Frequency - Switching: 220kHz
• Voltage - Input: 3.5 ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Other names: Q1109473

LTC1628/LTC1628-PG
APPLICATIO S I FOR ATIO
signal ground and a small V
should be as close as possible to the LTC1628 SGND pin.
The R2 and R4 connections should not be along the high
current input feeds from the input capacitor(s).
4. Are the SENSE
with minimum PC trace spacing? The filter capacitor
between SENSE
possible to the IC. Ensure accurate current sensing with
Kelvin connections at the SENSE resistor.
5. Is the INTV
the IC, between the INTV
28
CC
R
IN
decoupling capacitor connected close to
+
V
IN
–
and SENSE
U
C
and SENSE
IN
BOLD LINES INDICATE
HIGH, SWITCHING
CURRENT LINES.
KEEP LINES TO A
MINIMUM LENGTH.
+
CC
U
and the power ground pins?
OSENSE
–
+
should be as close as
leads routed together
W
decoupling capacitor
Figure 11. Branch Current Waveforms
SW1
SW2
U
D1
D2
This capacitor carries the MOSFET drivers current peaks.
An additional 1 F ceramic capacitor placed immediately
next to the INTV
performance substantially.
6. Is the I
between I
helps to filter the effects of PCB noise and output voltage
ripple voltage from the compensaton loop
7. Keep the switching nodes (SW1, SW2), top gate nodes
(TG1, TG2), and boost nodes (BOOST1, BOOST2) away
from sensitive small-signal nodes, especially from the
L1
L2
R
R
TH
SENSE1
SENSE2
TH
pin filter capacitor connected close to the IC,
C
C
and the signal ground pins? This capacitor
OUT1
OUT2
CC
V
V
+
+
OUT1
OUT2
and PGND pins can help improve noise
1628 F11
R
R
L1
L2
1628fb