LTC3703EGN-5#TRPBF Linear Technology, LTC3703EGN-5#TRPBF Datasheet - Page 17

• Manufacturer Part Number: LTC3703EGN-5#TRPBF
• Description: IC BUCK/BOOST SYNC ADJ 5A 16SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck), Step-Up (Boost)r

Specifications of LTC3703EGN-5#TRPBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 55.8 V
• Current - Output: 5A
• Frequency - Switching: 100kHz ~ 600kHz
• Voltage - Input: 9.3 ~ 60 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

APPLICATIO S I FOR ATIO
current to flow at full reverse voltage. If the reverse
current times reverse voltage exceeds the maximum
allowable power dissipation, the diode may be damaged.
For best results, use an ultrafast recovery diode such as
the MMDL770T1.
An internal undervoltage lockout (UVLO) monitors the
voltage on DRV
sufficient gate drive voltage. If the DRV
R1
R2
V
DRV
Figure 9c. Secondary Output Loop and V
CC
CC
OPTIONAL V
CONNECTION
5V < V
LTC3703-5
Figure 9a. V
V
DRV
FCB
GND
CC
+
CC
LTC3703-5
SEC
BGRTN
1µF
< 15V
SW
V
CC
TG
BG
IN
BGRTN
CC
BG1
CC
TG1
SW
V
U
IN
to ensure that the LTC3703-5 has
Generated from 5V < V
V
IN
+
V
U
IN
+
C
IN
L1
C
IN
N
1
W
R1
D1
5.1V
T1
CC
R1
OUT
D1
5.1V
CC
Q1
Connection
< 15V
voltage falls
+
Q1
U
37035 F09a
+
+
V
5V TO
15V
C
OUT
OUT
3703 F09c
1µF
C
V
V
SEC
OUT
OUT
Q1
V
DRV
below the UVLO threshold, the LTC3703-5 shuts down
and the gate drive outputs remain low.
Bottom MOSFET Source Supply (BGRTN)
The bottom gate driver, BG, switches from DRV
where BGRTN can be a voltage between ground and –5V.
Why not just keep it simple and always connect BGRTN to
ground? In high voltage switching converters, the switch
CC
CC
LTC3703-5
Figure 9d. Capacitive Charge Pump for V
+
V
DRV
D1
5.1V
CC
BGRTN
R1
Figure 9b. V
CC
LTC3703-5
1µF
SW
V
TG
BG
C
IN
IN
+
BGRTN
V
SW
V
TG
BG
C
IN
IN
IN
CC
+
V
Generated from V
IN
C10
1µF
10V
(<40V)
L1
ZHCS400
R17
37.4k
1%
R17
12.1k
1%
BAT85
D2
L1
R1
SW
FB
VN2222LL
LTC3703-5
LT1613
4.7µH
OUT
+
GND
L2
0.22µF
D1
5.1V
CC
< 5V
SHDN
C
OUT
V
(V
Q1
IN
+
IN
CC
< 40V)
BAT85
to BGRTN
BAT85
V
C
3703 F09d
OUT
OUT
17
3703 F09b
V
<5V
OUT
37035fa
C9
4.7µF
6.3V