LTM8045 datasheet(8/54 Pages) AD

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LTM4655

Rev. 0

For more information www.analog.com

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

Oscillator and Phase-Locked Loop (PLL)

fOSCn

Oscillator Frequency Accuracy

VINn = 12V, ISETna–SVOUTn– = 5V, and:

fSETn Open Circuit

RfSETn = 57.6kΩ (See fSN Specification)

360

400

1.95

440

kHz

MHz

fSYNCn

PLL Synchronization Capture Range

VINn = 12V, ISETna–SVOUTn– = 5V, CLKINn Driven

with a GND Referred Clock Toggling from 0.4V to

1.2V and Having a Clock Duty Cycle:

From 10% to 90%; fSETn Open Circuit

From 40% to 60%; RfSETn = 57.6kΩ

250

1.3

550

kHz

MHz

VCLKINn

CLKIN

n Input Threshold

VCLKINn Rising with Respect to GND

VCLKINn Falling with Respect to GND

1.2

0.4

ICLKINn

CLKINn Input Current

VCLKINn = 5V with Respect to GND

VCLKINn = 0V with Respect to GND

–20

230

–5

500

μA

Power Good Feedback Input and Power Good Output

OVPGDFBn

Output Overvoltage PGOOD

Upper Threshold

PGDFB

n Rising, Differential Voltage from PGDFBn

to SVOUTn–

620

645

675

UVPGDFBn

Output Undervoltage PGOOD

n Lower

Threshold

PGDFB

n Falling, Differential Voltage from PGDFBn

to SVOUTn–

525

555

580

∆VPGDFBn

PGOOD

n Hysteresis

PGDFB

n Returning

RPGDFBn

Resistor Between PGDFBn and SVOUTn–

4.94

4.99

5.04

kΩ

RPGOODn

PGOOD

n Pull-Down Resistance

VPGOODn = 0.1V with Respect to GND,

VPGDFBn–SVOUTn– < UVPGDFBn or

VPGDFBn–SVOUTn– > OVPGDFBn

700

1500

IPGOODn(LEAK)

PGOOD

n Leakage Current

VPGOODn = 3.3V with Respect to GND,

UVPGDFBn < VPGDFBn–SVOUTn– < OVPGDFBn

0.1

μA

tPGOODn(DELAY)

PGOOD

n Delay

PGOOD

n Low to High (Note 4)

PGOOD

n High to Low (Note 4)

16/fSW(Hz)

64/fSW(Hz)

Input Voltage Regulation Pin

VVINREGn

VINREGn Servo Voltage

VINREGn Voltage During Output Current Regulation,

Measured with Respect to SVOUTn–

1.8

2.0

2.2

IVINREGn

VINREGn Leakage Current

VINREG–SVOUTn– = 2V

INTVCCn Regulator

VINTVCCn

Channel Internal VCC Voltage, No

INTVCCn Loading (IINTVCCn = 0mA)

3.6V ≤ SVINn–SVOUTn– ≤ 40V, EXTVCCn= Open Circuit

5V ≤ SVINn–SVOUTn– ≤ 40V, 3.2V ≤ EXTVCCn–

VOUTn– ≤ 26.5V

(INTVCCn Measured with Respect to SVOUTn–)

3.15

2.85

3.4

3.0

3.65

3.15

VEXTVCCn(TH)

EXTVCCn Switchover Voltage

(EXTVCCn Measured with Respect to SVOUTn–)

(Note 4)

3.15

∆VINTVCCn(LOAD)/

VINTVCCn

INTVCCn Load Regulation

0mA ≤ IINTVCCn ≤ 30mA

–2

0.5

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the specified internal

operating temperature range (Note 2). Specified as each individual output channel (Note 5). TA = 25°C, Test Circuit 2 (negative-

VOUTn–, inverting buck-boost configuration with VOUTn+ = GND), VINn = 12V and electrically connected to SVINn, RUNn–GND = 3.3V,

ISET

na–SVOUTn– = 24V, EXTVCCn = GND, CLKINn open circuit, RfSETn = 57.6kΩ and RISETn = 480kΩ and voltages referred to GND

unless otherwise noted.

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