LTM4686 datasheet(6/132 Pages) AD

6 / 132 page

LTM4681

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 = 0, FREQUENCY_SWITCH = 350kHz and VOUTn commanded to 1.000V 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: 10A to 20A and 20A to 10A at 10A/µs,

VOUTn = 1.2V, VIN = 12V (Note 12) See Transient Graphs

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 = 34A for

IOUT_OC_FAULT_LIMIT, Page 97

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 = 40A,

Page 97

40; See IO-RB-ACC

Specification (Output Current

Readback Accuracy)

Control Section

VFBCMn

Channel 0 - 3 Feedback Input

Common Mode Range

VOSNSn– Valid Input Range (Referred to SGND)

VOSNSn+ Valid Input Range (Referred to SGND)

–0.1

0.3

3.6

VOUT-RNGL

Full-Scale Command Voltage, Range

Low (0.5V to 2.75V, Note 15) per

Channel

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

VOUT-RNGH

Full-Scale Command Voltage, Range

High (0.5V to 3.6V, Note 15) per

Channel

VOUTn Commanded to 3.6V, MFR_PWM_MODEn[0] = 1b

Limit Design to 3.6V Operating for Module

Set Point Accuracy

Resolution

LSB Step Size

−0.5

3.6

1.375

+0.5

Bits

RVSNSn+

VOSNSn+ Impedance to SGND

0.05V ≤ VVOSNSn+ – VSGND ≤ 3.3V

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, Note

Section)

0.5

Bits

kΩ

gmn

Resolution

Error Amplifier gm(MAX)

Error Amplifier gm(MIN)

LSB Step Size

COMPn = 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 14, 15)

Bits

VOV-RNG

Output OV Comparator Threshold

Detection Range

High Range Scale, MFR_PWM_MODEn[1] = 0b

Low Range Scale, MFR_PWM_MODEn[1] = 1b

0.5

3.6

2.7

VOUSTP

Output OV and UV Comparator

Threshold Programming LSB Step

Size

(Note 15)

High Range Scale, MFR_PWM_MODEn[1] = 0b

Low Range Scale, MFR_PWM_MODEn[1] = 1b

11.2

5.6

VOV-ACC-n

Output OV Comparator Threshold

Accuracy Channel 0 - 3

(See Note 14)

1V ≤ VVOSNSn+ – VVOSNSn– ≤ 2.7V, MFR_PWM_MODE[1] = 1b

0.5V ≤ VVOSNSn+ – VVOSNSn– ≤ 1V, MFR_PWM_MODE[1] = 1b

2.0V ≤ VVSNS – VSNG ≤ 3.6V, MFR_PWM_MODE[0] = 0b

±1.5

±2.5

±1.5

VUV-RNGn

Output UV Comparator Threshold

Detection Range

High Range Scale, MFR_PWM_MODEn[1] = 0b

Low Range Scale, MFR_PWM_MODEn[1] = 1b

0.5

3.6

2.7

VUV-ACCn

Output UV Comparator Threshold

Accuracy (Note 14)

1V ≤ VVOSNSn+ – VVOSNSn– ≤ 2.7V, MFR_PWM_MODE[1] = 1b

0.5V ≤ VVOSNSn+ – VVOSNSn– ≤ 1V, MFR_PWM_MODE[1] = 1b

2.0V ≤ VVSNS – VSNG ≤ 3.6V, MFR_PWM_MODE[0] = 0b

±1.5

±2.5

±1.5

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