ADP1871 datasheet(3/44 Pages) AD

Part #	ADP1871

Description	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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ADP1870/ADP1871

Rev. 0 | Page 3 of 44

SPECIFICATIONS

All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC). VREG = 5 V,

VBST − VSW = VREG − VRECT_DROP (see Figure 40 to Figure 42). VIN = 12 V. The specifications are valid for TJ = −40°C to +125°C,

unless otherwise specified.

Table 1.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

POWER SUPPLY CHARACTERISTICS

High Input Voltage Range

VIN

CIN = 22 μF to PGND (at Pin 1)

ADP1870ARMZ-0.3/ADP1871ARMZ-0.3 (300 kHz)

2.95

12

20

V

ADP1870ARMZ-0.6/ADP1871ARMZ-0.6 (600 kHz)

2.95

12

20

V

ADP1870ARMZ-1.0/ADP1871ARMZ-1.0 (1.0 MHz)

3.25

12

20

V

Quiescent Current

IQ_REG + IQ_BST

VFB = 1.5 V, no switching

1.1

mA

Shutdown Current

IREG,SD +

IBST,SD

COMP/EN < 285 mV

190

280

μA

Undervoltage Lockout

UVLO

Rising VIN (see Figure 35 for temperature variation)

2.65

V

UVLO Hysteresis

Falling VIN from operational state

190

mV

INTERNAL REGULATOR

CHARACTERISTICS

VREG Operational Output Voltage

VREG

CVREG = 1 μF to PGND, 0.22 μF to GND, VIN = 2.95 V to 20 V

ADP1870ARMZ-0.3/ADP1871ARMZ-0.3 (300 kHz)

2.75

5

5.5

V

ADP1870ARMZ-0.6/ADP1871ARMZ-0.6 (600 kHz)

2.75

5

5.5

V

ADP1870ARMZ-1.0/ADP1871ARMZ-1.0 (1.0 MHz)

3.05

5

5.5

V

VREG Output in Regulation

VIN = 7 V, 100 mA

4.8

4.981

5.16

V

VIN = 12 V, 100 mA

4.8

4.982

5.16

V

Load Regulation

0 mA to 100 mA, VIN = 7 V

32

mV

0 mA to 100 mA, VIN = 20 V

33

mV

Line Regulation

VIN = 7 V to 20 V, 20 mA

2.5

mV

VIN = 7 V to 20 V, 100 mA

2.0

mV

VIN to VREG Dropout Voltage

100 mA out of VREG, VIN ≤ 5 V

300

415

mV

Short VREG to PGND

VIN = 20 V

229

320

mA

SOFT START

Soft Start Period

See Figure 58

3.0

ms

ERROR AMPLIFER

FB Regulation Voltage

VFB

TJ = +25°C

600

mV

TJ = −40°C to +85°C

596

600

604

mV

TJ = −40°C to +125°C

594.2

600

605.8

mV

Transconductance

Gm

320

496

670

μS

FB Input Leakage Current

IFB, Leak

VFB = 0.6 V, COMP/EN = released

1

50

nA

CURRENT-SENSE AMPLIFIER GAIN

Programming Resistor (RES)

Value from DRVL to PGND

RES = 47 kΩ ± 1%

2.7

3

3.3

V/V

RES = 22 kΩ ± 1%

5.5

6

6.5

V/V

RES = none

11

12

13

V/V

RES = 100 kΩ ± 1%

22

24

26

V/V

SWITCHING FREQUENCY

Typical values measured at 50% time points with 0 nF

at DRVH and DRVL; maximum values are guaranteed

by bench evaluation1

ADP1870ARMZ-0.3/

ADP1871ARMZ-0.3 (300 kHz)

300

kHz

On-Time

VIN = 5 V, VOUT = 2 V, TJ = 25°C

1120

1200

1280

ns

Minimum On-Time

VIN = 20 V

146

190

ns

Minimum Off-Time

84% duty cycle (maximum)

340

400

ns

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