TS3310DB データシートの表示（PDF） - Unspecified

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TS3310DB

TS3310 Demo Board

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TS3310 Demo Board

DESCRIPTION

The TS3310DB is configured for 10µH inductor

operation and includes a 220pF CLSW capacitor which

is connected from the LSW pin to PCB ground,

otherwise labeled C6 on the demo board.

The maximum available output current for the

TS3310 is a function of the inductor value and the

average input current. The average input current will

vary according to the load. When the output current is

at its maximum, the averaged input current is at a

maximum. The maximum averaged input current is

defined by Equation 1.

IIN(AVG,MAX)=

Ipk

2

=

1µs∙V

L

Equation 1. Maximum Average Input Current

Calculation

The expected maximum STORE output current is

defined by Equation 2.

ISTORE(MAX)=

VIN

VOUT

× IIN(AVG,MAX) × Efficiency

Equation 2. Expected Maximum STORE Output

Current Calculation

Table 1 lists some example inductor values and the

corresponding expected maximum output load

current available for the TS3310, assuming an 85%

efficiency.

L

10µH

22µH

33µH

100µH

CLSW

220pF

100pF

---

---

ISTORE(MAX)

35mA

15mA

10mA

3mA

Table 1. Expected Maximum STORE Output

Current per Inductor Value

The TS3310 demo board is configured for 3V output

by default. With a 1.2V input voltage, the TS3310DB

which is configured for 10µH operation can supply a

maximum STORE output current of approximately

35mA.

The TS3310 demo board provides test points to

monitor the output voltage STORE and OUT. The

power good pin, VGOOD, is pulled to the STORE

output by a 3.3MΩ pull-up resistor R1 and can be

monitored via test point PG. To enable or disable the

OUT output voltage, a jumper for the OUT_ON pin is

available. The STORE and OUT output voltage can

be set via jumpers S2, S1, and S0.

Table 2 displays the S2, S1, and S0 combinations

along with the corresponding output voltage. For 5V

output operation, a minimum input voltage of 2V is

required. The TS3310 demo board circuit in its default

configuration, with a 3V output voltage, is displayed in

Figure 3.

S2 S1 S0

000

001

010

011

100

101

110

111

Same as Above

STORE

(V)

1.8

2.5

3.3

5

2.1

2.85

3

4.1

OUT_ON

OUT

(V)

HIGH

Equal to

STORE

(V)

Same as

Above

LOW

0V

Table 2. STORE and OUT Voltage Settings

TS3310-EVB Rev. 1.0

Figure 3. TS3310DB Circuit Schematic

Page 2

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