参数资料
型号: LTC3703EGN#TRPBF
厂商: Linear Technology
文件页数: 1/34页
文件大小: 0K
描述: IC REG CTRLR BST PWM VM 16-SSOP
标准包装: 2,500
PWM 型: 电压模式
输出数: 1
频率 - 最大: 330kHz
占空比: 96%
电源电压: 9.3 V ~ 15 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)

LTC3703
High Voltage Operation: Up to 100V
Large 1Ω Gate Drivers
No Current Sense Resistor Required
Step-Up or Step-Down DC/DC Converter
Dual N-Channel MOSFET Synchronous Drive
Excellent Line and Load Transient Response
Programmable Constant Frequency: 100kHz to
±1% Reference Accuracy
Synchronizable up to 600kHz
Selectable Pulse-Skip Mode Operation
Low Shutdown Current: 50μA Typ
Programmable Current Limit
Undervoltage Lockout
Programmable Soft-Start
16-Pin Narrow SSOP and 28-Pin SSOP Packages
48V Telecom and Base Station Power Supplies
Networking Equipment, Servers
Automotive and Industrial Control
FEATURES
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600kHz
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APPLICATIONS
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L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and No R SENSE are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents, including 5408150,
5055767, 6677210, 5847554, 5481178, 6304066, 6580258.
TYPICAL APPLICATION
V CC
9.3V TO 15V
100V Synchronous
Switching Regulator
Controller
DESCRIPTION
The LTC ? 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.
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 1Ω gate drivers allow the
LTC3703 to drive multiple MOSFETs for higher current ap-
plications. The operating frequency is user programmable
from 100kHz to 600kHz and can also be synchronized to
an external clock for noise-sensitive applications. Cur-
rent 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. For ap-
plications requiring up to 60V operation with logic-level
MOSFETS, refer to the LTC3703-5 data sheet.
PARAMETER LTC3703-5 LTC3703
Maximum V IN 60V 100V
MOSFET Gate Drive 4.5V to 15V 9.3V to 15V
V CC UV + 3.7V 8.7V
V CC UV – 3.1V 6.2V
30k
10k
1000pF 470pF
15k
8.06k
1%
0.1 μ F
MODE/SYNC V IN
f SET BOOST
LTC3703
COMP TG
FB SW
I MAX VCC
INV DRV CC
+
10
22μF
25V
BAS19
0.1 μ F
V IN
15V TO 100V
+
68μF
Si7456DP
8 μ H
270μF
16V
Si7456DP
+
V OUT
12V
5A
100
95
90
85
Efficiency vs Load Current
V IN = 25V
V IN = 50V
V IN = 75V
100
2200pF
113k
1%
RUN/SS
GND
BG
BGRTN
10μF
1 μ F
MBR1100
80
0
1
2 3
LOAD (A)
4
5
Figure 1. High Efficiency High Voltage Step-Down Converter
3703 F01
3703 F01b
3703fc
1
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