1046 查看數據表（PDF） - Linear Technology

零件编号

产品描述 (功能)

生产厂家

1046

"Inductorless" +5V to -5V Converter

Linear Technology 

LTC1046

TYPICAL PERFOR A CE CHARACTERISTICS (Using Test Circuit in Figure 1)

Oscillator Frequency as a

Function of Supply Voltage

100

TA = 25°C

COSC = 0pF

Oscillator Frequency vs

Temperature

40

38

V+ = 5V

COSC = 0pF

36

34

10

32

30

28

1

01 2 3 4 5 67

AMBIENT TEMPERATURE (°C)

1046 G10

26

–55 –25 0 25 50 75 100 125

AMBIENT TEMPERATURE (°C)

1046 G11

TEST CIRCUIT

+

C1

10µF

LTC1046

1

BOOST

2 CAP +

3

GND

V+ 8

OSC 7

LV 6

4 CAP – VOUT 5

COSC

Figure 1

V+ (5V)

IS

EXTERNAL

OSCILLATOR RL IL

VOUT

C2

10µF

1046 F01

APPLICATI S I FOR ATIO

Theory of Operation

To understand the theory of operation of the LTC1046, a

review of a basic switched capacitor building block is

helpful.

In Figure 2, when the switch is in the left position, capacitor

C1 will charge to voltage V1. The total charge on C1 will be

q1 = C1V1. The switch then moves to the right, discharg-

ing C1 to voltage V2. After this discharge time, the charge

on C1 is q2 = C1V2. Note that charge has been transferred

from the source, V1, to the output, V2. The amount of

charge transferred is:

∆q = q1 – q2 = C1(V1 – V2).

If the switch is cycled “f” times per second, the charge

transfer per unit time (i.e., current) is:

I = f • ∆q = f • C1(V1 – V2).

V1

V2

f

RL

C1

C2

1046 F02

Figure 2. Switched Capacitor Building Block

4

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