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LM3668-Q1_15 PDF预览

LM3668-Q1_15

更新时间： 2024-11-15 01:11:15
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德州仪器 - TI /
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24页 1557K
描述
1A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter

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LM3668-Q1_15 数据手册

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LM3668-Q1  
SNVSA84A –APRIL 2015–REVISED MAY 2015  
LM3668-Q1 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter  
1 Features  
2 Applications  
1
•
•
45-µA Typical Quiescent Current  
Output Voltage Option 4.5 V or 5 V  
•
•
•
Automotive Radar  
Automotive Camera  
Automotive Lidar  
–
–
–
–
1-A Maximum Load Current for  
VIN = 3.9 V to 5.5 V  
3 Description  
800-mA Maximum Load Current for  
VIN = 3.4 V to 3.8 V  
The LM3668-Q1 is a synchronous buck-boost DC-DC  
converter optimized for automotive requirements and  
input voltage rails between 2.7 V and 5.5 V. It has the  
capability to support up to 1-A output current over the  
output voltage range. The LM3668-Q1 regulates the  
output voltage over the complete input voltage range  
by automatically switching between buck or boost  
modes depending on the input voltage.  
700-mA Maximum Load Current for  
VIN = 3 V to 3.3 V  
600-mA Maximum Load Current for  
VIN = 2.7 V to 2.9 V  
•
•
2.2-MHz PWM Fixed Switching Frequency  
(Typical)  
The LM3668-Q1 has 2 N-channel MOSFETS and 2  
P-channel MOSFETS arranged in a topology that  
provides continuous operation through the buck and  
boost operating modes. There is a MODE pin that  
allows the user to choose between an intelligent  
automatic PFM-PWM mode operation and forced  
Automatic PFM-PWM Mode or Forced PWM  
Mode  
•
•
Wide Input Voltage Range: 2.7 V to 5.5 V  
Internal Synchronous Rectification for High  
Efficiency  
PWM operation. During PWM mode,  
a fixed-  
•
Internal Soft Start: 600-µs Maximum Start-Up  
Time After VIN Settled  
frequency 2.2 MHz (typical) is used. PWM mode  
drives load up to 1 A. Hysteretic PFM mode extends  
the battery life through reduction of the quiescent  
current to 45 µA (typical) at light loads during system  
standby. Internal synchronous rectification provides  
high efficiency. In shutdown mode (EN pin pulled  
low), the device turns off and reduces battery  
consumption to 0.01 µA (typical).  
•
•
0.01-µA Typical Shutdown Current  
Current Overload and Thermal Shutdown  
Protection  
•
Frequency Sync Pin: 1.6 MHz to 2.7 MHz  
Typical Application Circuit  
VIN = 2.7 V ꢀ 5.5 V  
A high switching frequency of 2.2 MHz (typical)  
allows the use of tiny surface-mount components  
including a 2.2-µH inductor, a 10-µF input capacitor,  
and a 22-µF output capacitor.  
C1  
10 µF  
VDD  
PVIN  
4.5 V/5 V  
VOUT  
FB  
SW1  
C2  
Device Information(1)  
LM3668-Q1  
22 µF  
2.2 µH  
SW2  
EN  
SYNC/MODE  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
VSEL  
L = 4.5 V  
H = 5 V  
LM3668-Q1  
WSON (12)  
4.00 mm x 4.00 mm  
NC  
SGND  
PGND  
(1) For all available packages, see the orderable addendum at  
the end of the datasheet.  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
 
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