LTM4650 datasheet(7/138 Pages) AD

7 / 138 page

LTM4664A

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the internal operating

junction temperature. TA = 25°C, VINS1 = 48V, and RUNn = 5V where n = stage # unless otherwise noted. See Figure 46 configuration

for setup. (Note 3)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ΔVOUT/VOUT

Stage 2

Stage 2 Load Regulation Accuracy

VOUT2 = 12V, 0A to 6.3A Maximum = 75W

VINS2 = 24V, FREQS2 = 200kHz

CINB2 = 33µF (Bulk Input Capacitor)

CIN2 = 10µF 50V Ceramic,

CFLY2 = 22µF 25V X6, COUT2 = 22µF 25V

VOUT2 Output Load

VOUT1 Max Load Current

(Note 4)

VOUT2 = 12V, 0A to 6.3A Maximum = 75W

VINS2 = 24V, FREQS2 = 200kHz

CINB2 = 33µF (Bulk Input Capacitor)

CIN2 = 10µF 50V Ceramic,

CFLY2 = 22µF 25V X6, COUT2 = 22µF 25V

6.3

M5-M8 RDS-ON

Stage 2 MOSFET On Resistance

VGS = 5V (Note 16)

mΩ

VOUT1, (AC)

Output Ripple Voltage

VOUT1 = 24V, 0A to 3A VINS1 = 48V, FREQS1 = 100kHz

CINB1 = 33µF (Input Bulk Capacitor)

CIN1 = 2.2µF 100V Ceramic, CFLY1 = 10µF 50V X6

COUT1 = 10µF 50V

150

mVpk-pk

VOUT2, (AC)

Output Ripple Voltage

VOUT2 = 12V, 0A to 6A

VINS2 = 12V, FREQS2 = 200kHz

CINB2 = 33µF (Input Bulk Capacitor)

CIN2 = 10µF 50V Ceramic,

CFLY2 = 22µF 25V X6, COUT2 = 22µF 25V

mVpk-pk

tSTART Stage 1

Turn-on Time

From RUN 1

VOUT1 = 0V at Start Up to 24V, 0A, VINS1 = 48V,

FREQS1 = 100kHz

CINB1 = 33µF (Input Bulk Capacitor)

CIN1 = 2.2µF 100V Ceramic, CFLY1 = 10µF 50V X6

COUT1 = 10µF 50V, CTIMERS1 = 0.22µF

msec

tSTART Stage 2

Turn-on Time Stage 2

From RUN 2

VOUT2 = 0V at Start Up to 12V, 0A, VINS2 = 24V,

FREQS2 = 200kHz

CINB2 = 33µF (Input Bulk Capacitor)

CIN1 = 2.2µF 100V Ceramic, CFLY1 = 22µF, 25V X6

COUT2 = 22µF 25V, CTIMERS2 = 0.47µF

msec

HYS_PRGMn and FAULTSn

VFAULTSn

FAULT Voltage Low

IFAULT = 2mA

0.2

0.5

IFAULT_LEAKSn

FAULT Leakage Current

VFAULT = 5V

±1

µA

IHYS_PRGMSn

HYS_PRGM Setting Current

µA

VFAULTSn

VOUTSn Fault Trip Level

VINSn = 24V, VOUTn, HYS_PRGMSn = 0V,

VOUTSn Ramp Up

VOUTSn Ramp Down

12.2

11.6

12.3

11.7

12.45

11.8

VFAULTSn

VOUTSn Fault Trip Level

VINSn = 24V, VOUTn, HYS_PRGMSn = 5V,

VOUTSn Ramp Up

VOUTSn Ramp Down

12.7

11.1

12.8

11.2

12.9

11.4

VFAULTSn

VOUTSn Fault Trip Level

VINSn = 24V, VOUTn, HYS_PRGMSn = 2.4V,

VOUTSn Ramp Up

VOUTSn Ramp Down

14.15

9.5

14.3

9.65

14.45

9.8

UV COMPARATORn and PGOODn

VUVTHSSn

Undervoltage Threshold

UV Pin Voltage Rising

0.99

1.01

1.03

VHYS_PRGMSn

Undervoltage Hysteresis

120

VPGOODSn

PGOOD Voltage Low

IPGOOD = 2mA

0.35

0.5

IPGOODSn_LEAK

PGOOD Leakage Current

VPGOOD = 5V

±1

µA

TimerSn

TimerSn Current

ITIMERn

VTIMER < 0.5V or VTIMER > 1.2V

3.5

µA

0.5V < VTIMER < 1.2V

µA

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