参数资料
型号: LTC3539EDCB-2#TRPBF
厂商: Linear Technology
文件页数: 1/14页
文件大小: 0K
描述: IC REG BOOST SYNC ADJ 2A 8DFN
标准包装: 2,500
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 1.5 V ~ 5.25 V
输入电压: 0.5 V ~ 5 V
PWM 型: 电流模式,混合
频率 - 开关: 2MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 8-DFN(3x2)
LTC3539/LTC3539-2
2A, 1MHz/2MHz
Synchronous Step-Up
DC/DC Converters
Delivers 3.3V at 900mA From 2 Alkaline/NiMH Cells
Delivers 5V at 900mA From a Lithium-Polymer
V IN Start-Up Voltage: 700mV
1.5V to 5.25V V OUT Range
Up to 94% Efficiency
V IN > V OUT Operation
±1.5% Feedback Voltage Tolerance
1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed
Output Disconnect
Selectable Burst Mode ? or PWM Operation
10μA Quiescent Current
Logic Controlled Shutdown: <1μA
Requires Only 6 External Components
Low Profile (2mm × 3mm × 0.75mm) DFN Package
Medical Instruments
Portable Bar Code Scanners
Noise Canceling Headphones
Portable GPS Navigation
Handheld PCs
FEATURES
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Battery
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Frequency Operation
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APPLICATIONS
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TYPICAL APPLICATION
Wide V IN , High Power 3.3V Regulator
DESCRIPTION
The LTC ? 3539/LTC3539-2 are synchronous, 2A step-up
DC/DC converters with output disconnect. Synchronous
rectification enables high efficiency in the low profile
2mm × 3mm DFN package. Battery life is extended with
a 700mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 1MHz (LTC3539) or 2MHz
(LTC3539-2) minimizes solution footprint by allowing the
use of tiny, low profile inductors and ceramic capacitors.
The current mode PWM design is internally compensated,
reducing external parts count. The LTC3539/LTC3539-2
feature a pin-enabled automatic Burst Mode operation at
light load conditions. Anti-ring circuitry reduces EMI by
damping the inductor in discontinuous mode. Additional
features include a low shutdown current of under 1μA and
thermal overload protection.
The LTC3539/LTC3539-2 are offered in a 2mm × 3mm ×
0.75mm DFN package.
L , LT, LTC, LTM and Burst Mode are registered trademarks and ThinSOT is a trademark of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Efficiency and Power Loss vs Load Current
V IN
1.8V TO 3.6V
2.2μF
V IN
4.7μH
SW
100
90
80
70
EFFICIENCY
1000
100
50 V IN = 3.3V
PWM  BURST
LTC3539
MODE V OUT
1M
33pF
V OUT
3.3V
600mA
60
40
V = 2.4V
OUT
POWER LOSS
10
OFF ON
SHDN
GND
FB
PGND
562k
3539 TA01a
22μF
× 2
30
20
10
0
0.1
1
FREQUENCY = 1MHz
FREQUENCY = 2MHz
10 100 1000
1
0.1
I LOAD AVERAGE (mA)
3539 TA01b
35392fb
For more information www.linear.com/3539/3539-2
1
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