3

Time (ms)

0

60

40

20

80 100

140

120

160 180 200

VIN = 3.8 V

VOUT = 2.8 V

IOUT = 200 mA

COUT = 2.2 F

m

TJ = 25 C

°

1

2

0

0

2

CNR = 0.0047 F

m

CNR = 0.01 F

m

4

CNR = 0.001 F

m

Time (ms)

0

30

20

10

40

50

70

60

80

90 100

IOUT = 200 mA

COUT = 2.2 F

m

CNR = 0.01 F

m

0

-20

3.8

dv

dt

0.4 V

ms

20

4.8

=

TPS730xx

GND

EN

NR

IN

OUT

V

IN

V

OUT

V

IN

V

OUT

2.2

µF

0.01

µF(1)

0.1

µF

NOTE: (1) This capacitor is optional.

TPS730

www.ti.com

SBVS054J – NOVEMBER 2004 – REVISED APRIL 2015

8.2 Typical Application

A typical application circuit is shown in Figure 18.

Figure 18. Typical Application Circuit

8.2.1 Design Requirements

Table 3 lists the design requirements.

Table 3. Design Parameters

PARAMETER

DESIGN REQUIREMENT

Input voltage

4.2 V to 3 V (Lithium Ion battery)

Output voltage

1.8 V, ±1%

DC output current

10 mA

Peak output current

75 mA

Maximum ambient temperature

65°C

8.2.2 Detailed Design Procedure

Pick the desired output voltage option. An input capacitor of 0.1 µF is used as the battery is connected to the

input through a via and a short 10-mil (0.01-in) trace. An output capacitor of 10 µF is used to provide optimal

response time for the load transient. Verify that the maximum junction temperature is not exceed by referring to

Figure 24.

8.2.3 Application Curves

Figure 19. TPS73028 Output Voltage, Enable Voltage vs

Figure 20. TPS73028 Line Transient Response

Time (Start-Up)

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