ADP3000 查看數據表（PDF） - Analog Devices

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ADP3000

Micropower Step-Up/Step-Down Fixed 3.3 V, 5 V, 12 V, Adjustable High Frequency Switching Regulator

Analog Devices 

ADP3000

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

ILIM 1

8 FB (SENSE)*

VIN 2 ADP3000 7 SET

SW1

3

TOP VIEW

(Not to Scale)

6

AO

SW2 4

5 GND

*FIXED VERSIONS

Figure 4. 8-Lead Plastic DIP (N-8)

ILIM 1

8 FB (SENSE)*

VIN 2 ADP3000 7 SET

SW1 3 TOP VIEW 6 AO

SW2 4 (Not to Scale) 5 GND

*FIXED VERSIONS

Figure 6. 8-Lead SOIC (R-8)

NC 1

14 NC

NC 2

ILIM 3

VIN 4

SW1 5

NC 6

E SW2 7

ADP3000

TOP VIEW

(Not to Scale)

13 FB

12 SET

11 AO

10 NC

9 NC

8 GND

NC = NO CONNECT

T Figure 5. 14-lead TSSOP (RU-14)

Table 3. Pin Function Descriptions

E Mnemonic

Function

ILIM

VIN

L SW1

SW2

O GND

AO

SET

S FB/SENSE

For normal conditions, connect to VIN. When lower current is required, connect a resistor between ILIM and VIN.

To limit the switch current to 400 mA, connect a 220 Ω resistor.

Input Voltage.

Collector of Power Transistor. For step-down configuration, connect to VIN. For step-up configuration, connect

to an inductor/diode.

Emitter of Power Transistor. For step-down configuration, connect to inductor/diode. For step-up

configuration, connect to ground. Do not allow pin to go more than a diode drop below ground.

Ground.

Auxiliary Gain Block (GB) Output. Open collector can sink 300 µA. This pin can be left open if not used.

Auxiliary Gain Amplifier Input. The amplifier’s positive input is connected to the SET pin, and its negative

input is connected to the 1.245 V reference. This pin can be left open if not used.

On the ADP3000 (adjustable) version, this pin is connected to the comparator input. On the ADP3000-3.3,

the ADP3000-5, and the ADP3000-12, the pin goes directly to the internal resistor divider that sets the

output voltage.

B SET

SET

A2

A0

A1

A0

O VIN

GAIN BLOCK/

ILIM

VIN

GAIN BLOCK/

ILIM

ERROR AMP

SW1

ERROR AMP

SW1

1.245V

1.245V

REFERENCE

A1 OSCILLATOR

REFERENCE

OSCILLATOR

COMPARATOR

DRIVER

SW2

COMPARATOR

DRIVER

SW2

GND

FB

ADP3000

R1

GND

R2

SENSE

ADP3000

Figure 7. Functional Block Diagram for Adjustable Version

Figure 8. Functional Block Diagram for Fixed Version

Rev. A | Page 5 of 16

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