参数资料
型号: LTC3603IUF#TRPBF
厂商: Linear Technology
文件页数: 1/22页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 2.5A 20QFN
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 14.5 V
输入电压: 4.5 V ~ 15 V
PWM 型: 电流模式,混合
频率 - 开关: 300kHz ~ 3MHz
电流 - 输出: 2.5A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-WFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 20-QFN 裸露焊盘(4x4)
LTC3603
Wide Input Voltage Range: 4.5V to 15V
2.5A Output Current
Low R DS(ON) Internal Switches: 45m Ω and 85m Ω
Programmable Frequency: 300kHz to 3MHz
Low Quiescent Current: 75μA
0.6V ±1% Reference Allows Precise,
99% Maximum Duty Cycle
Adjustable Burst Mode ? Clamp
Synchronizable to External Clock
Power Good Output Voltage Monitor
Overtemperature Protection
Overvoltage Protection
Available in 16-Lead Thermally Enhanced eMSOP
Point-of-Load Supplies
Portable Instruments
Communications Infrastructure
FEATURES
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Low Output Voltage
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and 4mm × 4mm QFN Packages
APPLICATIONS
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TYPICAL APPLICATION
3.3V, 2.5A, 1MHz Step-Down Regulator
2.5A, 15V Monolithic
Synchronous Step-Down
Regulator
DESCRIPTION
The LTC ? 3603 is a high efficiency, monolithic synchronous
step-down DC/DC converter utilizing a constant-frequency,
current mode architecture. It operates from an input voltage
range of 4.5V to 15V and provides an adjustable regulated
output voltage from 0.6V to 14.5V while delivering up to
2.5A of output current. The internal synchronous power
switch with 45m Ω on-resistance increases efficiency
and eliminates the need for an external Schottky diode.
The switching frequency can either be set by an external
resistor or synchronized to an external clock. OPTI-LOOP ?
compensation allows the transient response to be optimized
over a wide range of loads and output capacitors.
The LTC3603 can be configured for either Burst Mode op-
eration or forced continuous operation. Forced continuous
operation reduces noise and RF interference, while Burst
Mode operation provides the highest efficiency at light
loads. In Burst Mode operation, external control of the burst
clamp level allows the output voltage ripple to be adjusted
according to the requirements of the application.
L , LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered
trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5481178,
6580258, 6498466, 6611131, 6177787, 5705919, 5847554.
Efficiency and Power Loss vs Load Current
22μF
V IN
4.5V TO 15V
PV IN INTV CC
1μF
100
V IN = 12V
95 V OUT = 3.3V
90
EFFICIENCY
10000
1000
105k
4.32k
RUN BOOST
RT LTC3603
PGOOD SW
TRACK/SS
ITH PGND
0.22μF
2.2μH
V OUT
3.3V
100μF 2.5A
85
80
75
70
POWER LOSS
100
10
1nF
SYNC/MODE V FB
475k
65
105k
10pF
3603 TA01
60
0.001
0.01 0.1
LOAD CURRENT (A)
1
1
10
3603 TA01b
1
For more information www.linear.com/LTC3603
3603fc
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