LTM8049 datasheet(3/34 Pages) LINER

3 / 34 page

LTM4651

4651f

For more information www.linear.com/LTM4651

The l denotes the specifications which apply over the specified internal

operating temperature range (Note 2). TA = 25°C, Test Circuit 1, VIN = 24V and electrically connected to SVIN and RUN, ISETa – SVOUT– =

24V, EXTVCC = PGND, CLKIN open circuit, RfSET = 57.6kΩ and RISET = 480kΩ and voltages referred to PGND unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

SVIN(DC), VIN(DC)

Input DC Voltage

VIN+ |VOUT–| ≤ 58V

3.6

VOUT(RANGE)–

Range of Output Voltage Regulation

0.5V ≤ ISETa – SVOUT– ≤ 26.5V

–26.5

–0.5

VOUT(–24VDC)–

Output Voltage Total Variation with

Line and Load at VOUT– = –24V

3.6V ≤ VIN ≤ 34V, 0A ≤ IOUT– ≤ 0.3A, CLKIN Driven per

Note 6, CINH = 4.7μF, CD = 4.7μF × 2,

COUTH = 47μF × 2

–24.4 –24 –23.6

VOUT(–5VDC)–

Output Voltage Total Variation with

Line and Load at VOUT– = –5V

Measuring GNDSNS – ISETa

12V ≤ VIN ≤ 53V, 0A ≤ IOUT– ≤ 3A, CLKIN Driven by

550kHz Clock, CINH = 4.7μF, CD = 4.7μF × 2, COUTH

= 47μF × 2, ISETa – SVOUT– = 5V

–15

VOUT(–0.5VDC)–

Output Voltage Total Variation with

Line and Load at VOUT– = –0.5V

Measuring GNDSNS – ISETa

3.6V ≤ VIN ≤ 28V, 0A ≤ IOUT– ≤ 2A, CINH = 4.7μF,

CD = 4.7μF × 2, COUTH = 47μF × 2, RfSET = N/U,

ISETa – SVOUT– = 500mV, CLKIN Driven by 200kHz

Clock (Note 5)

–15

Input Specifications

VIN(UVLO)

SVIN Undervoltage Lockout Threshold SVIN Rising

SVIN Falling

Hysteresis

2.1

400

3.2

2.5

700

3.6

2.8

VIN(OVLO)

SVIN Overvoltage Lockout Rising

(Note 4)

VIN(HYS)

SVIN Overvoltage Lockout Hysteresis (Note 4)

IINRUSH(VIN)

Input Inrush Current at Start-Up

CINH = 4.7μF, CD = 4.7μF × 2, COUTH = 47μF × 2;

IOUT– = 0A, ISETa Electrically Connected to ISETb

1.1

IQ(SVIN)

Input Supply Bias Current

Shutdown, RUN = GND

RUN = VIN

450

μA

IS(VIN)

Input Supply Power Converter

CLKIN Open Circuit, IOUT– = 2A

2.3

IS(VIN, SHUTDOWN)

Input Supply Current in Shutdown

Shutdown, RUN = GND

µA

Output Specifications

IOUT–

VOUT– Output Continuous

Current Range

From VIN = 24V, Regulating VOUT– = –24V at fSW = 1.5MHz

From VIN = 12V, Regulating VOUT– = –5V at fSW = 550kHz

(See Note 3, Capable of Up to 4A Output Current for

Some Combinations of VIN, VOUT–, and fSW)

∆VOUT(LINE)–/VOUT– Line Regulation Accuracy

IOUT– = 0A, 3.6V ≤ VIN ≤ 34V, ISETa – SVOUT– = 24V,

CLKIN Driven by 1.8MHz Clock

0.05

0.25

∆VOUT(LOAD)–/VOUT– Load Regulation Accuracy

VIN = 24V, 0A ≤ IOUT– ≤ 2A, CLKIN Driven by 1.5MHz

Clock, RfSET = 57.6kΩ, and RISET = 480kΩ

0.05

0.5

VOUT(AC)–

Output Voltage Ripple, VOUT–

VIN = 12V, ISETa – SVOUT– = 5V

mVP–P

VOUT Ripple Frequency

VIN = 12V, ISETa – SVOUT– = 5V

1.7

1.95

2.2

MHz

∆VOUT(START)–

Turn-On Overshoot

tSTART

Turn-On Start-Up Time

Delay Measured from VIN Toggling from 0V to 24V to

PGOOD Exceeding 3V Above GND; PGOOD Having a

100kΩ Pull-Up to 3.3V with Respect to GND, VPGFB

Resistor-Divider Network as Shown in Test Circuit 1,

RISETa = 480kΩ, ISETa Electrically Connected to ISETb,

and CLKIN Driven with 1.2MHz Clock

∆VOUT(LS)–

Peak Output Voltage Deviation for

Dynamic Load Step

IOUT–: 0A to 1A and 1A to 0A Load Steps in 1μs,

COUTH = 47µF × 2 X5R

400

tSETTLE

Settling Time for Dynamic Load Step

IOUT–: 0A to 0.5A and 0.5A to 0A Load Steps in 1μs,

COUTH = 47µF × 2 X5R

µs

ELECTRICAL CHARACTERISTICS

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