LTM8045 datasheet(6/54 Pages) AD

6 / 54 page

LTM4655

Rev. 0

For more information www.analog.com

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 1 (positive-VOUTn+,

noninverting step-down configuration with VOUTn– = GND), VINn = SVINn = 36V, EXTVCCn = 24V, RUNn = 3.3V, RISETn = 480k, RfSETn+ =

57.6kΩ, fSWn = 1.5MHz (CLKINn driven with 1.5MHz clock signal) and voltages referred to GND unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

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)

Current Monitor and Input Voltage Regulation Pins

hIMONna

IOUTn+/IIMONna

Ratio of VOUTn+ Output Current to IIMONna

Current, IOUTn+ = 4A

IOSn(IMON)

IIMONna Offset Current

IIMONna at IOUTn+ = 0A

–5

μA

IMON

nb Resistor

Resistor Between IMON

nb and SVOUTn–

9.8

10.2

kΩ

VIMONna

IMON

na Servo Voltage

IMON

na Voltage During Output Current

Regulation

1.9

2.0

2.1

VVINREGn

VINREGn Servo Voltage

VINREG

n Voltage During Output Current

Regulation

1.8

2.0

2.2

IVINREGn

VINREGn Leakage Current

VINREG

n = 2V

INTVCCn Regulator

VINTVCCn

Channel Internal VCC Voltage, No

INTVCCn Loading (IINTVCCn = 0mA)

3.6V ≤ SVINn ≤ 40V, EXTVCCn Open Circuit

5V ≤ SVINn ≤ 40V, 3.2V ≤ EXTVCCn ≤ 26.5V

3.15

2.85

3.4

3.0

3.65

3.15

VEXTVCCn(TH)

EXTVCCn Switchover Voltage

(Note 4)

3.15

∆VINTVCCn(LOAD)/

VINTVCCn

INTVCCn Load Regulation

0mA ≤ IINTVCCn ≤ 30mA

–2

0.5

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

SVINn(DC), VINn(DC)

Input DC Voltage in

Negative-VOUT– Configuration

VINn+ |VOUTn–| ≤ 40V

3.6

VOUTn(RANGE)–

Range of Negative Output Voltage

Regulation

0.5V ≤ ISET

na–SVOUTn– ≤ 26.5V

–26.5

–0.5

VOUTn(–24VDC)–

Output Voltage Total Variation with Line

and Load at VOUTn– = –24V

3.6V ≤ VINn ≤ 16V, 0A ≤ IOUTn– ≤ 0.3A, CLKINn

Driven per Note 8, CINHn = 4.7μF, CDn = 4.7μF × 2,

COUTHn = 47μF × 2

–24.4

–24

–23.6

VOUTn(–5VDC)–

Output Voltage Total Variation with Line

and Load at VOUTn– = –5V

Measuring VOSNSn+ – ISETna, 12V ≤ VINn ≤ 35V,

0A ≤ IOUT– ≤ 3A, CLKINn Driven by 550kHz Clock,

CINHn = 4.7μF, CDn = 4.7μF × 2, COUTHn = 47μF ×

2, ISET

na–SVOUTn– = 5V

–15

RSVINFn

Resistor Between SVINn and SVINFn

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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