LTM4650 datasheet(4/28 Pages) AD

4 / 28 page

LTM4660

Rev. 0

For more information www.analog.com

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over specified internal

operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = VINSNS = 54V, VOUT = 12V and EXTVCC = 12V

(see Note 4). Configured per Block Diagram circuit with no output load unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Capacitor Voltage-Balancing

VTIMER_LOW

Voltage at TIMER Pin to Start Capacitor

Balancing

0.5

VTIMER_HIGH

Voltage at TIMER Pin to Stop Capacitor

Balancing

1.25

ITIMER

TIMER Pin Charge Current

VTIMER = 0.9V

VTIMER = 2.8V

–6

–3

–7

–3.5

–8

–4

μA

VHYS_PRGM

Capacitor Balancing Window Comparator

Threshold

VHYS_PRGM = 0V

VHYS_PRGM = 1.2V

VHYS_PRGM = INTVCC

±0.3

±1.2

±0.8

IHYS_PRGM

HYS_PRGM Pin Current

VHYS_PRGM = 0V

–9

–10

–11

μA

VFAULT

FAULT Pin Voltage Low

IFAULT = 0.6mA

0.2

0.4

IFAULT

FAULT Leakage Current

VFAULT = 20V

μA

IC+(SOURCE)

Current Out of C+ During Capacitor Balancing VC+ to VC– < VIN/2, VC– = 12V, VIN = 48V (Note 8)

IC+(SINK)

Current Into C+ During Capacitor Balancing VC+ to VC– > VIN/2, VC– = 12V, VIN = 48V (Note 8)

IC–(SINK)

Current Into C– During Capacitor Balancing VC+ to VC– < VIN/2, VC– = 12V, VIN = 48V (Note 8)

IC–(SOURCE)

Current Out of C– During Capacitor Balancing VC+ to VC– > VIN/2, VC– = 12V, VIN = 48V (Note 8)

IMID(SOURCE)

Current Out of MID During Capacitor Balancing VMID < VIN/2, VMID = VMID_SNS = 23V,

VC+ to VC– ≥ 27V, VC– = 12V, VIN = 48V (Note 8)

IMID(SINK)

Current Into MID During Capacitor Balancing

VMID > VIN/2, VMID = VMID_SNS = 31V,

VC+ to VC– ≥ 27V, VC– = 12V, VIN = 48V (Note 8)

Oscillator and Timer Circuits

fSYNC(RANGE)

External Frequency Synchronization Range

200

1000

kHz

fSW

Nominal Switching Frequency

RFREQ = 61.9kΩ

450

kHz

IFREQ

FREQ Setting Current

VFREQ = 0V (Note 8)

–9.5

–10

–10.5

µA

Power Good

RPGOOD

PGOOD Pull-Down Resistance

IPGOOD = 0.6mA

650

IPGOOD_LEAK

PGOOD Leakage Current

VPGOOD = 20V

±1

µA

INTVCC Regulator and EXTVCC Circuits

VINTVCC_INT

INTVCC Voltage No Load

10V ≤ VIN ≤ 60V, VEXTVCC = 0V

5.65

5.95

INTVCC Load Regulation

IINTVCC = 0 to 50mA, VEXTVCC = 0V

0.8

±2

VINTVCC_EXT

INTVCC Voltage No Load with EXTVCC Bias 12V < VEXTVCC < 18V

5.65

5.8

5.95

INTVCC Load Regulation with EXTVCC Bias

IINTVCC = 0 to 50mA, VEXTVCC = 12V

0.5

±2

EXTVCC Switchover Voltage

EXTVCC Ramping Positive

EXTVCC Hysteresis

200

Temperature Sensor

ΔVTEMP

Temperature Sensor Forward Voltage,

VTEMP+ to VTEMP–

ITEMP+ = 100µA and ITEMP– = –100 μA at

TA = 25°C

0.6

TCΔV(TEMP)

ΔVTEMP Temperature Coefficient

–2.0

mV/°C

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