Shengbang Microelectronics launches 18V 8A high-efficiency synchronous step-down converter SGM61184
Time:2023-12-29
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Shengbang Microelectronics has launched an efficient synchronous step-down converter SGM61184, which supports an input voltage range of 4.5V to 18V and an 8A output current capability. It adopts peak current control with a fixed switching frequency and operates in forced pulse width modulation mode (Force PWM), ensuring extremely low switching jitter (Jitter) and low output voltage ripple across the full load range. Widely applicable in wireless communication, instrumentation, industrial control and other fields.
The SGM61184 chip has rich functions and flexible configurations, including enabling function, adjustable soft start, adjustable switching frequency, adjustable output voltage, external loop compensation, normal power indication, support for frequency synchronization, pre bias start, and complete protection functions. The chip adopts TQFN-3.5, which conforms to environmental protection concepts × 3.5-18AL green packaging.
3. SGM61184 has a built-in soft start function, which can reduce the instantaneous input current surge and ensure that the output voltage is free of overshoot. Input undervoltage lockout (UVLO), enable control pin (EN), and power normal indication (PG) can achieve sequential logic control of system power on and off.
4. SGM61184 has a wide range of protection functions, including input undervoltage lockout (UVLO), high and low side switch tube current limiting and hiccup mode protection (Hiccup), low side switch tube negative current limiting, output overvoltage protection (Output OVP), input overvoltage protection (Input OVP), and over temperature protection (OTP).
5. The SGM61184 package adopts a Flip Chip structure, which can reduce the parasitic inductance introduced by traditional wire bonding methods. Combined with the optimized MOSFET driving technology of Shengbang, it effectively reduces the parasitic oscillations of switch nodes. While reducing internal device stress, it is combined with a symmetrical TQFN package and PCB layout to effectively optimize the EMI characteristics of the device.
Figure 1 Typical Application Circuit of SGM61184
Typical characteristics of SGM61184
Input voltage range from 4.5V to 18V;
Adjustable output voltage from 0.6V to 12V;
Low conduction impedance switching tube: 8.6m Ω upper tube and 4.5m Ω lower tube;
Adjustable switching frequency range from 200kHz to 1600kHz;
0.6V ± 1.2% high-precision reference voltage (-45 ℃ to+150 ℃);
Clock synchronization is possible;
Adjustable soft start;
Support pre bias start;
Enable pins;
Output undervoltage and overvoltage indication (PG);
Input undervoltage blocking, input overvoltage protection, belching mode current limiting function, output overvoltage protection, and over temperature protection;
-Working junction temperature range from 45 ℃ to+150 ℃;
TQFN-3.5 that conforms to environmental protection concepts × 3.5-18AL green packaging.
SGM61184 Core Features
1. SGM61184 integrates two main switching tubes (8.6m Ω and 4.5m Ω) with extremely low conduction impedance (RDSON), effectively improving converter efficiency, reducing system energy consumption, saving equipment operating costs, and reducing system temperature rise, simplifying heat dissipation design. In addition, the device supports a maximum junction temperature of+150 ℃ and can adapt to harsh temperature environments.
Figure 2 Actual Efficiency Curve
SGM61184 adopts peak current mode control, fixed switching frequency, and operates in forced pulse width modulation mode. Ensuring small output voltage ripple within the full load range is very suitable for applications sensitive to power ripple and switching frequency jitter, such as communication base stations, instruments, etc.
Application scenarios of SGM61184
In communication application scenarios, equipment may be installed outdoors or even outdoors. To meet the IP65 protection level, electronic systems are installed in enclosed spaces and can only rely on natural heat dissipation (without forced air or liquid cooling). SGM61184 supports a working junction temperature of+150 ℃, with an over temperature protection point set at+175 ℃. It can be used in environments with poor heat dissipation or harsh high temperatures. SGM61184 has high conversion efficiency, which can reduce power loss, improve system efficiency, reduce heat dissipation pressure, and save operating costs. This device has a fixed switching frequency, low output voltage ripple, and optimized EMI characteristics, which can reduce interference to noise sensitive systems.
Figure 13 Application diagram of SGM61184
Figure 13 Application diagram of SGM61184 Figure 14 Temperature rise of SGM61184 (based on EVB testing at room temperature)
SGM61184 is also widely used in fields such as measurement, instrumentation, medical, and industrial applications.
About Shengbang Microelectronics
Shengbang Microelectronics (Beijing) Co., Ltd. (stock code 300661) focuses on the research and sales of high-performance and high-quality analog integrated circuits. The product covers two major fields: signal chain and power management, with over 4600 models available for sale in 30 categories. All of them are independently developed and widely used in industries, automotive electronics, communication equipment, consumer electronics, medical instruments, as well as emerging markets such as the Internet of Things, new energy, and artificial intelligence.
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