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LT3990IDDB#TRPBF

更新时间： 2024-10-01 13:09:43
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
28页 417K
描述
IC 0.865 A SWITCHING REGULATOR, 2640 kHz SWITCHING FREQ-MAX, PDSO10, 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10, Switching Regulator or Controller

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LT3990IDDB#TRPBF 技术参数

是否无铅：不含铅是否Rohs认证：符合
生命周期：Obsolete零件包装代码：SON
包装说明：HVSON, SOLCC10,.08,20针数：10
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.66
Is Samacsys：N其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 1.21V TO 25V
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：60 V
最小输入电压：4.2 V标称输入电压：12 V
JESD-30 代码：R-PDSO-N10JESD-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：0.865 A标称输出电压：3.3 V
封装主体材料：PLASTIC/EPOXY封装代码：HVSON
封装等效代码：SOLCC10,.08,20封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：250
认证状态：Not Qualified座面最大高度：0.8 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：2640 kHz
技术：BIPOLAR温度等级：AUTOMOTIVE
端子面层：Matte Tin (Sn)端子形式：NO LEAD
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：40宽度：2 mm
Base Number Matches：1

LT3990IDDB#TRPBF 数据手册

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LT3976  
40V, 5A, 2MHz Step-Down  
Switching Regulator with  
3.3µA Quiescent Current  
FeaTures  
DescripTion  
n
Ultralow Quiescent Current:  
3.3µA I at 12V to 3.3V  
OUT  
The LT®3976 is an adjustable frequency monolithic buck  
switchingregulatorthatacceptsawideinputvoltagerange  
up to 40V. Low quiescent current design consumes only  
3.3µAofsupplycurrentwhileregulatingwithnoload. Low  
ripple Burst Mode operation maintains high efficiency at  
low output currents while keeping the output ripple below  
15mV in a typical application. The LT3976 can supply up  
to 5A of load current and has current limit foldback to  
limitpowerdissipationduringshort-circuit. Alowdropout  
voltage of 500mV is maintained when the input voltage  
drops below the programmed output voltage, such as  
during automotive cold crank.  
Q
IN  
Low Ripple Burst Mode® Operation  
n
Output Ripple < 15mV  
P-P  
n
n
n
n
n
n
n
n
n
n
n
n
n
Wide Input Range: Operation from 4.3V to 40V  
5A Maximum Output Current  
Excellent Start-Up and Dropout Performance  
Adjustable Switching Frequency: 200kHz to 2MHz  
Synchronizable Between 250kHz to 2MHz  
Accurate Programmable Undervoltage Lockout  
Low Shutdown Current: I = 700nA  
Q
Power Good Flag  
Soft-Start Capability  
Thermal Shutdown Protection  
An internally compensated current mode topology is used  
for fast transient response and good loop stability. A high  
efficiency 75mΩ switch is included on the die along with a  
boost Schottky diode. An accurate 1.02V threshold enable  
pin can be driven directly from a microcontroller or used  
as a programmable undervoltage lockout. A capacitor on  
theSSpinprovidesacontrolledinrushcurrent(soft-start).  
Current Limit Foldback with Soft-Start Override  
Saturating Switch Design: 75mΩ On-Resistance  
Small, Thermally Enhanced 16-Lead MSOP and  
24-Lead 3mm × 5mm QFN Packages  
applicaTions  
A power good flag signals when V  
reaches 91.6% of  
OUT  
n
Automotive Battery Regulation  
the programmed output voltage. The LT3976 is available  
in small 16-lead MSOP and 24-lead 3mm × 5mm QFN  
packages with exposed pad for low thermal resistance.  
n
Portable Products  
n
Industrial Supplies  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective owners.  
Typical applicaTion  
No-Load Supply Current  
3.3V Step-Down Converter  
8
IN REGULATION  
V
IN  
4.3V TO 40V  
V
OUT  
= 3.3V  
7
6
5
4
3
2
1
0
V
IN  
OFF ON  
EN  
PG  
BOOST  
SW  
3.3µH  
0.47µF  
10µF  
2Ω  
470pF  
PDS540  
LT3976  
SS  
RT  
OUT  
FB  
V
3.3V  
5A  
1M  
OUT  
10pF  
SYNC  
GND  
10nF  
47µF  
1210  
×2  
20 25  
130k  
576k  
0
5
10 15  
30 35 40  
INPUT VOLTAGE (V)  
3976 TA01a  
f = 400kHz  
3976 G05  
3976f  
1
For more information www.linear.com/3976  
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