LTC1700EMS#TR Linear Technology, LTC1700EMS#TR Datasheet - Page 14

• Manufacturer Part Number: LTC1700EMS#TR
• Description: IC DC/DC CONTRLR STP-UP 10-MSOP
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LTC1700EMS#TR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Current - Output: 1A
• Frequency - Switching: 530kHz
• Voltage - Input: 0.9 ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Power - Output: -
• Other names: LTC1700EMSTR

LTC1700
APPLICATIONS
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1700. These items are illustrated graphically in the
layout diagram in Figure 8. Check the following in your
layout:
1. Are all the components connected close to the SW node
(Pin 10)? The SW pin is the input to the V
amplifier and the current reverse comparator.
2. Connect the V
P-channel MOSFET. Besides supplying current to the
LTC1700, it also serves as the other input to the current
reverse comparator.
14
OUT
U
C1, C3: TAIYO YUDEN CERAMIC JMK316BJ106ML
C2: AVX TAJB68K006R
C4: SANYO POSCAP 6TPB470M
lead directly to the source of the
3.9nF
100k
INFORMATION
270pF
U
C4
C3
Figure 8. LTC1700 Layout Diagram (See PC Board Layout Checklist)
470pF
5k
316k
R1
R2
R3
W
1
2
3
4
5
1
2
4
3
5
SGND
I
V
RUN/SS
SYNC/MODE
TH
FB
SGND
I
RUN/SS
V
SYNC/MODE
TH
Figure 7. Design Example Schematic
FB
LTC1700
LTC1700
DS
U
PGND
V
sense
PGND
OUT
V
SW
BG
TG
OUT
SW
BG
TG
L1: SUMIDA CEP1233R2
M1: INTERNATIONAL RECTIFIER IR7811W
M2: SILICONIZ Si9803
10
9
8
7
6
10
8
9
6
7
V
IN
3. Connect the (+) plate of C2 to the source of the P-channel
MOSFET. This capacitor supports the load current when
the inductor is being “recharged”.
4. Connect the (–) plate of C2 to the source of the N-channel
MOSFET. Connect the power and signal ground to this
node.
5. Does the V
resistors? The resistive divider R1 and R2 must be con-
nected between the (+) plate of C2 and signal ground.
6. Keep the switching node SW away from sensitive small
signal nodes.
7. Switched currents flow in M1, M2 and C2, keep the loop
formed by these components as small as possible.
C1
L1
M1
IR7811W
M1
3.2µH
Si9803
L1
M2
M2
FB
pin connect directly to the feedback
+
C1
22µF
C3
22µF
C2
+
+
1700 • F08
V
OUT
C2
68µF
6.3V
C4
470µF
6.3V
×2
1700 • F07
V
3.3V
V
5V/3A
OUT
IN
1700fa