SLVS273A Data sheet | 德州仪器 TI.com.cn

SLVS273A February 2000 – November 2015 TPS60140 , TPS60141

PRODUCTION DATA.

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机械数据 (封装 | 引脚)

PWP|20
- MHTS001G

散热焊盘机械数据 (封装 | 引脚)

PWP|20
- PPTD166L

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10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

10.1 Application Information

The TPS6014x charge pumps provide a regulated 5-V output from a 1.8-V to 3.6-V input voltage range. They can deliver a maximum continuous load current of at least 100 mA at V_I = 2 V minimum.

10.2 Typical Application

TPS60140 TPS60141 typ_operating_circuit_slvs273.gif

Figure 6. Typical Application Schematic

10.2.1 Design Requirements

Designed specifically for space-critical battery-powered applications, the complete charge pump circuit requires only four external capacitors. The design guideline provides a component selection to operate the device within the Recommended Operating Conditions.

Table 2 shows the list of components for the Application Curves.

Table 2. Components for Application Curves

REFERENCE	VALUE	DESCRIPTION	MANUFACTURER	PART NUMBER
C1, C2	2.2 µF	Ceramic flying capacitors	Taiyo Yuden	EMK316BJ225KL-T
C_IN	4.7 µF	Ceramic input capacitor	Taiyo Yuden	LMK316BJ475KL-T
C_OUT	10 µF	Ceramic output capacitor	Taiyo Yuden	JMK316BJ106ML-T
R1	357 kΩ	LBI input voltage adjustment		E96-Series
R2	619 kΩ	LBI input voltage adjustment		E96-Series
R3	1 MΩ	Pullup resistor for the open-drain output LBO

10.2.2 Detailed Design Procedure

10.2.2.1 Capacitor Selection

The capacitance values of the TPS6014x external capacitors are closely linked to the output current and output ripple requirements. For lowest ripple, low ESR (< 0.1 Ω) capacitors should be used at the input and output of the charge pump.

The input capacitor improves system efficiency by reducing the input impedance. It also stabilizes the input current of the power source. The input capacitor should be chosen according to the power supply used and the distance from the power source to the converter IC. The input capacitor selection also depends on the output ripple requirements. C_IN is recommended to be about 2-times to 4-times as large as the flying capacitors. The lower the ESR of the input capacitor C_IN, the lower is the output ripple.

The output capacitor C_OUT can be selected from 2× to 50× larger than the flying capacitor, depending on the ripple tolerance. The larger C_OUT and the lower its ESR, the lower will be the output voltage ripple.

Generally, the flying capacitors will be the smallest. Only ceramic capacitors are recommended because of their low ESR and because they retain their capacitance at the switching frequency. Be aware that, depending on the material used to manufacture them, ceramic capacitors might lose their capacitance over temperature and voltage. Ceramic capacitors of type X7R or X5R material will keep their capacitance over temperature and voltage, whereas Z5U or Y5V-type capacitors will decrease in capacitance. Table 3 lists recommended capacitor values.

Table 3. Recommended Capacitor Values

I_OUT (mA)	C_IN (µF)	C_(xF) (µF)	C_OUT (µF)	V_PPTYP (mV)
0 − 50	4.7	2.2	4.7	40
0 − 100	4.7	2.2	10	40
0 − 100	4.7	2.2	22	18

If the measured output voltage ripple is too high for the application, improvements can be made. The first step is to increase the capacitance at the output. If the ripple is still too high, the second step would be to increase the capacitance at the input. For lower output currents, lower value flying capacitors can be used. Table 3 and Table 4 lists the manufacturers of recommended capacitors.

Table 4. Recommended Capacitors⁽¹⁾

MANUFACTURER	PART NUMBER	CAPACITANCE	CASE SIZE	TYPE
Taiyo Yuden	LMK212BJ105KG−T EMK316BJ225KL−T LMK212BJ225MG−T LMK316BJ475KL−T JMK316BJ106ML–T LMK325BJ106MN−T LMK432226MM−T	1 µF 2.2 µF 2.2 µF 4.7 µF 10 µF 10 µF 22 µF	805 1206 805 1206 1206 1210 1812	Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic
AVX	0805ZC105KAT2A 1206ZC225KAT2A	1 µF 2.2 µF	805 1206	Ceramic Ceramic