NCV8843 데이터 시트보기 (PDF) - ON Semiconductor

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NCV8843

Buck Regulator - Synchronous 1.5 A, 340 kHz

ON Semiconductor 

NCV8843

ELECTRICAL CHARACTERISTICS (continued) (−40°C < TJ < 150°C, 4.5 V< VIN < 40 V; unless otherwise specified.)

Characteristic

Test Conditions

Min

Typ

Max

Unit

General

Quiescent Current

Shutdown Quiescent Current

Boost Operating Current

Minimum Boost Voltage

ISW = 0 A

VSHDNB = 0 V, −40°C < TJ < 125°C

VBOOST − VSW = 2.5 V

(Note 6)

−

4.0

7.5

mA

−

1.0

5.0

mA

6.0

15

40

mA/A

−

−

2.5

V

Startup Voltage

−

3.0

3.5

4.0

V

Minimum Output Current

−

−

7.0

12

mA

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.

6. Guaranteed by design, not 100% tested in production.

SHDNB

SYNC

VIN

2.9 V LDO

Voltage

Regulator

Internal rail

Shutdown

Comparator

+

−

+

1.2 V −

4 mA

Artificial

Ramp

SHDNB

1.46 V

∑

+

−

PWM Com-

parator

Oscillator

Thermal

Shutdown

SQ

R

Output

Driver

Current

Limit Com-

parator

IREF

−

VFB

−

+

+

0.32 V

+

−

Frequency IFOLDBACK

and Current

1.27 V

+

−

Error

Amplifier

Limit Foldback

VC

Figure 2. Block Diagram

BOOST

VSW

GND

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