LT3505EMS8E#TRPBF Linear Technology, LT3505EMS8E#TRPBF Datasheet - Page 15

• Manufacturer Part Number: LT3505EMS8E#TRPBF
• Description: IC REG SW STP DWN 1.2A 8-MSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LT3505EMS8E#TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.78 ~ 33.8 V
• Current - Output: 1.2A
• Frequency - Switching: 200kHz ~ 3MHz
• Voltage - Input: 3.6 ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP Exposed Pad, 8-HMSOP, 8-eMSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

APPLICATIONS INFORMATION
V
IN
V
MAX V
BOOST
V
BOOST
IN
– V
V
V
V
C
C
C
SW
FB
100k
FB
100k
FB
301k
Figure 5. Transient Load Response of the LT3505 with Different Output Capacitors as the
Load Current is Stepped from 500mA to 1.2A. V
LT3505
BOOST
22pF
22pF
22pF
≅ V
GND
≅ V
IN
32.4k
10.0k
32.4k
10.0k
OUT
+ V
32.4k
10.0k
SW
OUT
(6a)
44pF
66pF
Figure 6. Two Circuits for Generating the Boost Voltage
22pF
C3
+
D2
10µF
×2
10µF
120µF
KEMET
A700D127M006ATE015
V
V
V
OUT
OUT
OUT
3505 F06a
V
OUT
AC COUPLED
AC COUPLED
AC COUPLED
20mV/DIV
20mV/DIV
20mV/DIV
IN
1A/DIV
1A/DIV
1A/DIV
= 12V, V
I
I
I
V
V
V
LOAD
LOAD
LOAD
OUT
OUT
OUT
V
IN
OUT
= 3.3V, L = 2µH, R
V
MAX V
BOOST
V
BOOST
D2
IN
– V
SW
LT3505
BOOST
≅ 2V
GND
10µs/DIV
10µs/DIV
10µs/DIV
≅ V
IN
IN
SW
(6b)
T
= 20.0k
C3
3505 F05b
3505 F05c
3505 F05a
LT3505
3505 F06b
V
OUT
15
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