LTM4686 datasheet(6/130 Pages) AD

6 / 130 page

LTM4682

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 4). TA = 25°C, VIN = 12V, RUNn = 3.3V,

RUNP = 12V, FREQUENCY_SWITCH = 575kHz and VOUTn commanded to 0.75V unless otherwise noted. Configured with factory-default

EEPROM settings and per Test Circuit 1, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tSETTLE

Settling Time for Dynamic Load Step

per Channel

Load: 0A to 10A and 10A to 0A at 10A/µs,

VOUTn = 0.75V, VIN = 12V (Note 12) See the Transient

Graphs in the Typical Performance Characteristics section.

µs

IOUTn(OCL_PK)

Output Current Limit, Peak High

Range per Channel

Cycle-by-Cycle Inductor Peak Current Limit Inception,

Utilizing MFR_PWM_MODE[7] = 1, Using ~IOUT = 42A

for IOUT_OC_FAULT_LIMIT, See the IOUT_OC_FAULT_

LIMIT in the PMBus Command Details Section

IOUTn(OCL_AVG)

Output Current Limit, Time Averaged

per Channel

Time-Averaged Output Inductor Current Limit Inception

Threshold, Commanded by IOUT_OC_FAULT_LIMITn

(Note 12) Utilizing MFR_PWM_MODE[7] = 1, Using ~IOUT

= 42A, See the IOUT_OC_FAULT_LIMIT in the PMBus

Command Details Section

See the IOUT-RB-ACC

Specification (Output

Current Readback

Accuracy)

Control Section

VFBCMn

Channel 0 to Channel 3 Feedback

Input Common Mode Range

VOSNSn– Valid Input Range (Referred to SGND)

VOSNSn+ Valid Input Range (Referred to SGND)

–0.1

0.3

2.0

VOUT-RNGL

Full-Scale Command Voltage, Range

Low (0.7V to 2.75V) per Channel

(Note 14)

VOUTn Commanded to 2.750V, MFR_PWM_MODEn[1] = 1b

Set Point Accuracy

Resolution

LSB Step Size

−0.5

2.75

0.688

+0.5

Bits

RVSNSn+

VOSNSn+ Impedance to SGND

0.5V ≤ VVOSNSn+ – VSGND ≤ 1.5V

kΩ

tON(MIN)

Minimum On-Time

(Note 8 ) per Channel

RCOMPn

Resolution

Compensation Resistor RTH(MAX)

Compensation Resistor RTH(MIN)

MFR_PWM_CONFIG[4:0] = 0 to 31 (See Figure 1, in the

Note Section)

Bits

kΩ

gmn

Resolution

Error Amplifier gm(MAX)

Error Amplifier gm(MIN)

LSB Step Size

VCOMPn = 1.35V, MFR_PWM_CONFIG[7:5] = 0 to 7

5.76

0.68

Bits

mmho

Analog OV/UV (Overvoltage/Undervoltage) Output Voltage Supervisor Comparators (VOUT_OV/UV_FAULT_LIMIT and VOUT_OV/UV_WARN_LIMIT Monitors)

NOV/UV_COMP

Resolution, Output Voltage

Supervisors

(Notes 13, 14)

Bits

VOV-RNG

Output OV Comparator Threshold

Detection Range

High Range Scale, Not Needed, Output Limited to 1.35V

Low Range Scale, MFR_PWM_MODEn[1] = 1b (Note 14)

0.7

2.7

VOUSTP

Output OV and UV Comparator

Threshold Programming LSB Step Size

(Note 14)

Low Range Scale, MFR_PWM_MODEn[1] = 1b

5.6

VOV-ACC-n

Output OV Comparator Threshold

Accuracy Channel 0 to Channel 3

(Note 13)

0.7V≤VVOSNSn+–VVOSNSn–≤1.35V,MFR_PWM_MODE[1]=1b l

±3

VUV-RNGn

Output UV Comparator Threshold

Detection Range

High Range Scale, Not Needed, Output Limited to 1.35V

Low Range Scale, MFR_PWM_MODEn[1] = 1b

0.7

2.7

VUV-ACCn

Output UV Comparator Threshold

Accuracy Channel 0 to Channel 3

(Note 13)

0.7V ≤ VVOSNSn+–VVOSNSn–≤1.35V,MFR_PWM_MODE[1]=1b l

±3

tPROP-OV

Output OV Comparator

Response Times

Overdrive to 10% Above Programmed Threshold

100

µs

tPROP-UV

Output UV Comparator

Response Times

Underdrive to 10% Below Programmed Threshold

100

µs

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