参数资料
型号: LTC3612IUDC#TRPBF
厂商: Linear Technology
文件页数: 1/30页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 3A 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 ~ 5.5 V
输入电压: 2.25 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 300kHz ~ 4MHz
电流 - 输出: 3A
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(3x4)
LTC3612
3A Output Current
2.25V to 5.5V Input Voltage Range
Low Output Ripple Burst Mode ? Operation: I Q = 70μA
±1% Output Voltage Accuracy
Output Voltage Down to 0.6V
High Efficiency: Up to 95%
Low Dropout Operation: 100% Duty Cycle
Shutdown Current: ≤1μA
Adjustable Switching Frequency: Up to 4MHz
Optional Active Voltage Positioning (AVP) with
Selectable Pulse-Skipping/Forced Continuous/
Programmable Soft-Start
Inputs for Start-Up Tracking or External Reference
DDR Memory Mode, I OUT = ±1.5A
Available in Thermally Enhanced 20-Pin
Point-of-Load Supplies
Distributed Power Supplies
Portable Computer Systems
DDR Memory Termination
Handheld Devices
FEATURES
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Internal Compensation
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Burst Mode Operation with Adjustable Burst Clamp
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(3mm × 4mm) QFN and TSSOP Packages
APPLICATIONS
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TYPICAL APPLICATION
3A, 4MHz Monolithic
Synchronous Step-Down
DC/DC Converter
DESCRIPTION
The LTC ? 3612 is a low quiescent current monolithic syn-
chronous buck regulator using a current mode, constant
frequency architecture. The no-load DC supply current
in sleep mode is only 70μA while maintaining the output
voltage (Burst Mode operation) at no load, dropping to
zero current in shutdown. The 2.25V to 5.5V input supply
voltage range makes the LTC3612 ideally suited for single
Li-Ion as well as fixed low voltage input applications. 100%
duty cycle capability provides low dropout operation,
extending the operating time in battery-powered systems.
The operating frequency is externally programmable up to
4MHz, allowing the use of small surface mount inductors.
For switching noise-sensitive applications, the LTC3612
can be synchronized to an external clock at up to 4MHz.
Forced continuous mode operation in the LTC3612 reduces
noise and RF interference. Adjustable compensation allows
the transient response to be optimized over a wide range
of loads and output capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external catch diode, saving
external components and board space. The LTC3612 is
offered in a leadless 20-pin 3mm × 4mm QFN or a thermally
enhanced 20-pin TSSOP package.
L , LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 6498466,
6611131.
Efficiency and Power Loss vs Load Current
100
10
V IN
2.5V TO 5.5V
SV IN
RUN
TRACK/SS
PV IN
PV IN_DRV
DDR
22μF
× 2
90
80
70
60
1
0.1
RT/SYNC
LTC3612 SW
PGOOD SGND
560nH
47μF
V OUT
2.5V
3A
50
40
0.01
ITH
PGND
30
V IN = 5V
MODE V FB
210k
665k
3612 TA01a
20
10
0
1
10
V IN = 3.3V
V IN = 2.8V
100 1000 10000
0.001
OUTPUT CURRENT (mA)
3612 TA01b
3612fb
For more information www.linear.com/LTC3612
1
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