CAT6220 Просмотр технического описания (PDF) - ON Semiconductor

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CAT6220

300 mA Adjustable Voltage LDO Regulator

ON Semiconductor 

CAT6220

Table 1. PIN DESCRIPTIONS

Package Pin #

Pin Name

TSOT

TDFN

VIN

1

3

GND

2

2

EN

3

1

ADJ

4

6

NIC

−−

5

VOUT

5

4

GND

−−

PAD

Supply voltage input.

Function

Ground reference. All GND pins must be grounded.

Enable input (active high)

Digital programming input

No Internal Connection. A voltage or signal applied to this pin will have no effect upon

device operation.

Output Voltage Adjustment.

Center pad or tab; for heat sinking

Pin Function

VIN is the supply pin for the LDO. A small 1 mF ceramic

bypass capacitor is required between the VIN pin and ground

near the device. When using longer connections to the power

supply, CIN value can be increased without limit. The

operating input voltage range is from 2.3 V to 6.5 V.

EN is the enable control logic (active high) for the regulator

output. Enable is a high impedance input and must not be left

unconnected. Floating EN will result in unpredictable action

at VOUT.

VOUT is the LDO regulator’s output. Output voltage is set

by two external resistors arranged as a voltage divider

between VOUT and Ground. The center point of the divider

is connected to ADJ as shown in Figure 2. The minimum

recommended current through resistors is 5 mA. The ratio of

the resistors is set by the formula:

ǒ Ǔ VOUT + 1.24 V

1

)

R1

R2

VIN VOUT

CAT6220

ADJ

EN

GND

VOUT

R1

1 mF

R2

Figure 2. R1 and R2 Set CAT6220’s Output Voltage

A small 1 mF ceramic bypass capacitor is required

between the VOUT pin and ground. For better transient

response, its value can be increased to 2.2 mF. This capacitor

should be located near the device.

GND is the ground reference for the LDO. This pin must be

connected to the system ground line or the ground plane of

the PCB.

The backside center pad of the TDFN package is

internally connected to the GND pin. Any PCB connection

to this pad must be either floating or at GND potential.

ADJ is the LDO’s voltage control input. This pin is

connected to the center of the resistor voltage divider R1,

R2. A 10 pF capacitor connected in parallel with R1 will

improve the transient load regulation for VOUT ≤ 2 V.

Thermal and Short Circuit Protection

CAT6220 is equipped with thermal protection and

over−current limiting circuitry.

In the event of a short circuit CAT6220 will limit its output

current to approximately 400 mA. If the short circuit persists

CAT6220’s internal temperature will rise and if the chip’s

temperature reaches 140°C CAT6220 will shut off all

current to the load which protects the system and allows the

LDO to cool down. When the LDO’s internal temperature

drops below 130°C the LDO automatically turns ON again.

If the short circuit is still present another thermal cycle will

ensue. This will continue until either the short circuit is

removed or the Enable pin is taken LOW.

For the TSOT23−5 package, a continuous 300 mA output

current may turn−on the thermal protection. If this happens

the LDO will respond by shutting off power to the load and

thermal cycling will begin.

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