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RTQ2940-QA

更新时间： 2024-12-02 17:01:51
品牌 Logo 应用领域
立锜 - RICHTEK /
页数 文件大小 规格书
37页 739K
描述
42VIN, 0.5A, Asynchronous Step-Down Converter with Low Quiescent Current

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RTQ2940-QA 数据手册

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®
RTQ2940-QA  
42VIN, 0.5A, Asynchronous Step-Down Converter with Low  
Quiescent Current  
Features  
General Description  
AEC-Q100 Grade 1 Qualified  
The RTQ2940 is a 0.5A, high-efficiency, peak current mode  
control asynchronous step-down converter which is  
optimized for automotive applications. The device operates  
with input voltages from 4V to 42V and is protected from  
load dump transients up to 45V, eases input surge  
protection design. The device can program the output  
voltage between 0.8V to VIN. The low quiescent current  
design with the integrated low RDS(ON) of high-side  
MOSFET achieves high efficiency over the wide load range.  
The peak current mode control with simple external  
compensation allows the use of small inductors and  
results in fast transient response and good loop stability.  
FMEA Compliant Pinout  
Wide Input Voltage Range  
4.5V to 42V  
4V to 42V (Soft-start is finished)  
Wide Output Voltage Range : 0.8V to VIN  
0.8V 1.5% Reference Accuracy  
Peak Current Mode Control  
Integrated 170mΩ High-Side MOSFET  
Low Quiescent Current : 90μA  
Low Shutdown Current : 1.3μA  
Adjustable Switching : 100kHz to 2.5MHz  
Synchronizable Switching : 300kHz to 2.2MHz  
Power Saving Mode (PSM) at Light Load  
Built-In Spread-Spectrum Frequency Modulation  
Low Dropout at Light Loads with Integrated Boot  
Recharge FET  
The wide switching frequency of 100kHz to 2500kHz allows  
for efficiency and size optimization when selecting the  
output filter components. The ultra-low minimum on-time  
enables constant-frequency operation even at very high  
step-down ratios. For switching noise sensitive  
applications, it can be externally synchronized from  
300kHz to 2200kHz. The build-in spread-spectrum  
frequency modulation further helping systems designers  
with better EMC management.  
Externally Adjustable Soft-Start by Part Number  
Option  
Power Good Indication by Part Number Option  
Enable Control  
Adjustable UVLO Voltage and Hysteresis  
Adjacent Pin-Short Protection  
Built-In UVLO, UVP, OVP, OCP, OTP  
The RTQ2940 provides complete protection functions such  
as input under-voltage lockout, output under-voltage  
protection, output over-voltage protection, over-current  
protection, and thermal shutdown. Cycle-by-cycle current  
limit provides protection against shorted outputs, and soft-  
start eliminates input current surge during start-up. The  
RTQ2940 is available in WDFN-10SL 3x3 and SOP-8  
(Exposed pad) packages.  
Applications  
Automotive, Communications and Industrial 12V and 24V  
Power Systems  
IndustrialAutomation and Motor Control  
Vehicle Accessories : GPS, Entertainment  
Simplified Application Circuit  
RTQ2940GQW  
RTQ2940GSP  
C
C
BOOT  
BOOT  
V
IN  
V
IN  
VIN  
BOOT  
VIN  
BOOT  
SW  
L1  
L1  
C
IN  
V
C
SW  
V
OUT  
IN  
OUT  
D1  
D1  
C
C
OUT  
EN  
OUT  
Enable Signal  
PGOOD  
R
R
R
R
FB1  
FB1  
EN  
Enable Signal  
FB  
FB  
PGOOD  
R
RT  
FB2  
FB2  
RT/SYNC  
COMP  
C
COMP1  
R
COMP  
COMP  
C
COMP1  
C
R
COMP  
SS/TR  
R
RT  
C
SS  
C
COMP2  
COMP2  
RT/SYNC  
PAD  
GND  
GND  
PAD  
Copyright 2021 Richtek Technology Corporation. All rights reserved.  
©
is a registered trademark of Richtek Technology Corporation.  
DSQ2940-QA-01 March 2021  
www.richtek.com  
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