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LT3991IMSE-5#PBF

更新时间： 2024-10-01 21:10:43
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
24页 388K
描述
LT3991 - 55V, 1.2A Step-Down Regulator with 2.8µA Quiescent Current; Package: MSOP; Pins: 10; Temperature Range: -40°C to 85°C

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LT3991IMSE-5#PBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：MSOP包装说明：HTSSOP, TSSOP10,.19,20
针数：10Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：7.49模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：55 V最小输入电压：4.3 V
标称输入电压：12 VJESD-30 代码：S-PDSO-G10
JESD-609代码：e3长度：3 mm
湿度敏感等级：1功能数量：1
端子数量：10最高工作温度：125 °C
最低工作温度：-40 °C最大输出电流：2.9 A
标称输出电压：5 V封装主体材料：PLASTIC/EPOXY
封装代码：HTSSOP封装等效代码：TSSOP10,.19,20
封装形状：SQUARE封装形式：SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
座面最大高度：1.1 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BUCK
最大切换频率：2400 kHz技术：BIPOLAR
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：3 mmBase Number Matches：1

LT3991IMSE-5#PBF 数据手册

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LT3991/LT3991-3.3/LT3991-5  
55V, 1.2A Step-Down  
Regulator with 2.8µA  
Quiescent Current  
FeaTures  
DescripTion  
The LT®3991 is an adjustable frequency monolithic buck  
switchingregulatorthatacceptsawideinputvoltagerange  
up to 55V. Low quiescent current design consumes only  
2.8µAofsupplycurrentwhileregulatingwithnoload. Low  
ripple Burst Mode operation maintains high efficiency at  
low output currents while keeping the output ripple below  
15mV in a typical application. An internally compensated  
current mode topology is used for fast transient response  
and good loop stability. A high efficiency 0.44Ω switch  
is included on the die along with a boost Schottky diode  
and the necessary oscillator, control and logic circuitry.  
An accurate 1V threshold enable pin can be used to shut  
down the LT3991, reducing the input supply current to  
700nA. A capacitor on the SS pin provides a controlled  
inrush current (soft-start). A power good flag signals  
n
Ultralow Quiescent Current:  
2.8µA I Regulating 12V to 3.3V  
Q
IN  
OUT  
n
n
Fixed Output Voltages: 3.3V, 5V  
2.1µA I Regulating 12V  
Q
IN  
Low Ripple Burst Mode® Operation:  
Output Ripple < 15mV  
P-P  
n
n
n
n
n
n
n
n
n
n
n
n
n
Wide Input Voltage Range: 4.3V to 55V  
1.2A Maximum Output Current  
Adjustable Switching Frequency: 200kHz to 2MHz  
Synchronizable Between 250kHz to 2MHz  
Fast Transient Response  
Accurate 1V Enable Pin Threshold  
Low Shutdown Current: I = 700nA  
Q
Power Good Flag  
Soft-Start CapabilityV  
Internal Compensation  
when V  
reaches 91% of the programmed output volt-  
OUT  
Saturating Switch Design: 0.44Ω On-Resistance  
Output Voltage: 1.19V to 30V  
Small Thermally Enhanced 10-Pin MSOP Package  
and (3mm × 3mm) DFN Packages  
age. The LT3991 is available in small 10-pin MSOP and  
3mm × 3mm DFN packages with exposed pads for low  
thermal resistance.  
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.  
applicaTions  
n
Automotive Battery Regulation  
n
Power for Portable Products  
n
Industrial Supplies  
No Load Supply Current  
Typical applicaTion  
3.0  
OUTPUT IN REGULATION  
3.3V Step Down Converter  
V
IN  
4.3V TO 55V  
2.5  
V
IN  
EN./UVLO  
PG  
BOOST  
SW  
OFF ON  
LT3991-5  
2.0  
0.47µF  
12µH  
LT3991-3.3  
SS  
RT  
LT3991-3.3  
4.7µF  
1.5  
BD  
V
3.3V  
1.2A  
OUT  
118k  
V
OUT  
SYNC GND  
47µF  
1.0  
5
10 15 20 25 30 35 40 45 50 55  
3991 TA01a  
INPUT VOLTAGE (V)  
f = 400kHz  
3991 G06  
3991fa  
1
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