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LTC3703 Datasheet

  • LTC3703

  • 100V Synchronous Switching Regulator Controller

  • 32頁

  • LINER

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LTC3703
100V Synchronous
Switching Regulator
Controller
FEATURES
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
High Voltage Operation: Up to 100V
Large 1
鈩?/div>
Gate Drivers
No Current Sense Resistor Required
Step-Up or Step-Down DC/DC Converter
Dual N-Channel MOSFET Synchronous Drive
Excellent Transient Response and DC Line Regulation
Programmable Constant Frequency: 100kHz to
600kHz
鹵1%
Reference Accuracy
Synchronizable up to 600kHz
Selectable Pulse Skip Mode Operation
Low Shutdown Current: 50碌A(chǔ) Typ
Programmable Current Limit
Undervoltage Lockout
Programmable Soft-Start
16-Pin Narrow SSOP and 28-Pin SSOP Packages
The LTC
廬
3703 is a synchronous step-down switching
regulator controller that can directly step-down voltages
from up to 100V, making it ideal for telecom and automo-
tive applications. The LTC3703 drives external N-channel
MOSFETs using a constant frequency (up to 600kHz),
voltage mode architecture. The external component count
has been minimized, providing a compact overall solution
footprint.
A precise internal reference provides 1% DC accuracy. A
high bandwidth error amplifier and patented line feed
forward compensation provide very fast line and load
transient response. Strong 1鈩?gate drivers allow the
LTC3703 to drive multiple MOSFETs for higher current
applications. The operating frequency is user program-
mable from 100kHz to 600kHz and can also be synchro-
nized to an external clock for noise-sensitive applications.
Current limit is programmable with an external resistor
and utilizes the voltage drop across the synchronous
MOSFET to eliminate the need for a current sense resistor.
Soft- start is provided by an external capacitor. Pulling the
soft-start pin low shuts down the LTC3703, reducing
supply current to 50碌A(chǔ).
APPLICATIO S
s
s
s
48V Telecom and Base Station Power Supplies
Networking Equipment, Servers
Automotive and Industrial Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V
CC
9.3V TO 15V
+
MODE/SYNC V
IN
30k
22k
3300pF
8.06k
1%
15pF
FB
15k
I
MAX
INV
0.1碌F
330鈩?/div>
113k
1%
RUN/SS
GND
VCC
DRV
CC
SW
FSET
BOOST
LTC3703
COMP
TG
22碌F
25V
V
IN
BAS21 15V TO 100V
+
Si7456DP
22碌F
脳2
8碌H
10鈩?/div>
Si7456DP
EFFICIENCY (%)
0.1碌F
V
OUT
12V
5A
220碌F
25V
脳2
+
BG
10碌F
BGRTN
1碌F
MBR1100
80
0
1
3
2
LOAD (A)
4
5
3703 F01b
1500pF
3703 F01
Figure 1. High Efficiency High Voltage Step-Down Converter
3703f
U
Efficiency vs Load Current
100
V
IN
= 25V
V
IN
= 50V
V
IN
= 75V
90
95
85
U
U
1

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