NCP1589DMNTWG datasheet(5/8 Pages) ONSEMI

Part #	NCP1589DMNTWG

Description	Low Voltage Synchronous Buck Controller

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NCP1589D

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ELECTRICAL CHARACTERISTICS (0°C < TA < 95°C; 4.5 V < [BOOT−LX] < 13.2 V, 4.5 V < BOOT < 30 V, 0 V < LX < 21 V,

CTG = CBG = 1.0 nF, for min/max values unless otherwise noted.)

Characteristic

Unit

Max

Typ

Min

Conditions

POWER GOOD INCLUDING OVP AND UVP THRESHOLD

Output Voltage

Logic Low, Sinking 4 mA

0.4

V

Overvoltage until PGOOD goes low

880

902

mV

Undervoltage until PGOOD goes low

698

720

mV

PGOOD High Upper Limit Hysteresis

16

mV

PGOOD High Lower Limit Hysteresis

16

mV

OVP Threshold to Part Disable

950

1000

1030

mV

UVP Threshold to Part Disable

570

600

630

mV

Power Good Delay (Note 1)

1.0

ms

ZERO CURRENT DETECTION (LX Pin)

Zero Current Detection Blank Timer after

TG < 1.0 V

LX > 50 mV, LG on time

200

250

350

ns

Capture Time for LX Voltage (Note 1)

Time to Capture LX Voltage Once LG is <

1.0 V

40

ns

ZERO CURRENT Vth ADJUSTMENT DETECTION (LX Pin)

Negative LX Detection Voltage

Vbdls

200

300

400

mV

Positive LX Detection Voltage

Vbdhs

0.2

0.5

1.0

V

Time for Vth Adjustment and Settling Time

300 kHz

3.0

3.7

ms

Zero Current Detection Blank Timer after

LG < 1.0 V (Note 1)

Blanking Time After LG is < 1.0 V

40

ns

Initial Negative Current Detection

Threshold Voltage Setpoint (Note 1)

LX−GND, Includes $2 mV Offset Range

−5.0

−3.0

−1.0

mV

Vth Adjustable Range (Note 1)

−16

0

15

mV

OVERCURRENT PROTECTION

OC Current Source

Sourced from LG pin, before SS

9.5

10

10.5

mA

OCP Programming Time

VCC > 4.5 V, Roscset = 60 kW

1.0

5.0

ms

1. Guaranteed by design but not tested in production.

Figure 3. Dead Time Definition

Ugate to Phase

Phase

1 V

Lgate

Tdead1

Tdead2

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