HT7181 3.7V/7.4V to 16V built-in MOS high power boost IC solution

Posted on: 05/02/2022

[Introduction]DC-DC boost circuits are very common in Electronic circuits. Whether it is to match the working voltage of different devices or to improve enough output power, a boost circuit must be used. Especially for portable electronic products, the power source is battery-powered, such as single-cell lithium battery, three-cell lithium battery or lead-acid battery 12V. Through the DC-DC boost circuit, it can supply power to other circuits after boosting.

The boost chip is a switching circuit, and the most critical indicators are the input MOS switch tube current, output voltage value, boost output current and efficiency. The built-in MOS tube integrated chip DC-DC booster integrated circuit below 70W is very mature. For example, the DC-DC booster IC in the SOT-23 package on the market is boosted from 3.7V to 12V, and the maximum input current is generally within 3A; the DC-DC booster in the SOP8 package is generally less than 3A. – The maximum current of the built-in switch tube of the DC boost IC is 10A, but the maximum output voltage is 12-13V.

Shenzhen Yongfukang Technology Co., Ltd. promotes a 17.8V output, high-current asynchronous DC-DC boost IC with an integrated 14A switch tube for DC-DC boost application requirements with a boost value below 18V: HT7181. HT7181 adopts unique circuit research and development technology and advanced semiconductor process. Based on eSOP8 package, the working efficiency is as high as 92%, and no external heat sink is required; the pin function is compatible with the previously launched HT7180, and the performance is upgraded while realizing seamless switching of circuit design. .

1. HT7181 overview

The HT7181 is a high-power non-synchronous boost converter with integrated 20mΩ power switch, providing an efficient and small-footprint solution for portable systems. The HT7181 has a wide input voltage range of 2.7V to 16V and can support applications using single or two-cell Li-Ion batteries, or 12V lead-acid batteries. The device has 14A switching current capability and can provide output voltages up to 17.8V. The HT7181 also supports programmable soft-start, and adjustable switch peak current limit. The HT7181 also supports two different tr/tf to accommodate different EMI and efficiency requirements. In addition, the device also provides 18V output overvoltage protection, and thermal shutdown protection.

2. Features of HT7181

● Input voltage range: 2.7V-16V

● Output voltage range: up to 17.8V

● Fixed switching frequency: 360kHz

High conversion efficiency:

● 83% (VIN = 3.7V, VOUT=9V, IOUT =2.7A)

● 83% (VIN = 3.7V, VOUT=12V, IOUT =2.5A)

● 82% (VIN = 3.7V, VOUT=16V, IOUT =1.5A)

● 91% (VIN = 3.7V, VOUT=12V, IOUT =1A)

● 92% (VIN = 7.4V, VOUT=13V, IOUT =5A)

● 94% (VIN = 7.4V, VOUT=13V, IOUT =3A)

● 90% (VIN = 7.4V, VOUT=16V, IOUT =4A)

● 93% (VIN = 7.4V, VOUT=16V, IOUT =1.5A)

● Low shutdown power consumption, shutdown current 1uA

● Support two tr/tf modes to deal with EMI challenges

● Programmable soft start

● Output overvoltage (18V), thermal shutdown and other protections

● eSOP8L-PP lead-free package

3. Application of HT7181

● Drawbar speakers, portable speakers, wireless speakers

● Charging device, power bank, USB TYPE-C power transmission

● Tablet PC, Notebook PC・POS Terminal

4. Typical application parameters

The typical parameters of HT7181 used in single-cell lithium battery boost, double-cell lithium battery boost, and three-cell lithium battery boost are as follows:

● The single-cell lithium battery 3.7V is boosted to 9V/3.33A/30W.

● Single-cell lithium battery 3.7V application boost to 12V/2.5A/30W.

● Single-cell lithium battery 3.7V application boost to 16V/1.88A/30W.

● Double-cell lithium battery 7.4V is boosted to 13V/5.38A/70W.

● Double-cell lithium battery 7.4V is boosted to 16V/4.38A/70W.

● Three-cell lithium battery 12V application boost to 16V/7.5A/120W.

Single-cell/dual-cell/three-cell lithium battery application boost output voltage/current/power and set resistance value corresponding to FB pin: