UCC386, UCC387, UCC388

LOW DROPOUT 200mA LINEAR REGULATOR

SLUS377B - JULY 1999 - REVISED MAY 2000

2

POST OFFICE BOX 655303

description (continued)

The UCC386 has an on-chip resistor network for preset to regulate at 3.3 V, while the UCC387 has a fixed 5-V

output. The UCC388 requires an external resistor network that can be programmed for output voltages down

to 1.25 V. The output voltage is regulated to 1.5% at room temperature and better than 2.5% over the entire

operating temperature range.

Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by limiting

the duty cycle of the load to 12.5% typical. This drastically reduces the power dissipation during short circuit

such that heat sinking, if at all required, must only accommodate normal operation.

Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown

occurs if the junction temperature exceeds 140

°C. The chip remains in the off state until the temperature drops

to 115

°C.

Pulling OFFB low commands a low-power shutdown mode, which requires less than 2-

µA quiescent current.

These devices are available in the 8-pin TSSOP (PW) and 8-pin SOIC (DP) surface-mount power packages.

For other packaging options consult the factory.

AVAILABLE OPTIONS

TA

OUTPUT VOLTAGE (V)

PACKAGE DEVICES

TA

MIN

TYP

MAX

SOIC-8 (DP)

TSSOP-8 (PW)

3.22

3.30

3.38

UCC386DP

UCC386PW

0

°C to 70°C

4.785

5.000

5.125

UCC387DP

UCC387PW

ADJ

UCC388DP

UCC388PW

† All package types are available taped and reeled. Add TR suffix to device type (e.g.

UCC386DPTR) to order quantities of 3000 devices per reel.

VIN

9 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OFFB

–0.3 V to VIN 0.3 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–55

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead Temperature (Soldering, 10 sec)

300

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

‡ Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and

considerations of packages. All voltages are referenced to GND.

otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

UCC386 Fixed 3.3 V Output

Output voltage

TA = 25°C

3.25

3.3

3.35

V

Output voltage

Over temperature

3.22

3.3

3.38

V

Line regulation

VIN = 3.45 V to 8.5 V,

IOUT = 10 mA

13

25

mV

Load regulation

IOUT = 1 mA to 200 mA

5

10

mV

Output noise voltage

TJ = 25°C,

BW = 10 Hz to 10 kHz

200

µVRMS

Dropout voltage VIN VOUT

IOUT = 200 mA,

VOUT = 3.20 V

200

500

mV

Dropout voltage, VIN-VOUT

IOUT = 50 mA,

VOUT = 3.20 V

50

mV