LTM4676_15 datasheet(5/78 Pages) LINER

Part #	LTM4676

Description	Dual 13A or Single 26A Module Regulator with Digital Power System Management

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Manufacturer	LINER [Linear Technology]

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LTM4676

5

4676fc

For more information www.linear.com/LTM4676

elecTrical characTerisTics The

l

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 = 5V,

FREQUENCY_SWITCH = 500kHz 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

tDELAY(0ms)

Turn-On Delay Time

Time from First Rising Edge of RUNn to Rising Edge of GPIOn.

TON_DELAYn = 0ms, TON_RISEn = 3ms,

MFR_GPIO_PROPAGATEn = 0x0100,

MFR_GPIO_RESPONSEn = 0x0000.

VIN Having Been Established for at Least 170ms

l

2.75

3.1

3.5

ms

∆VOUTn(LS)

Peak Output Voltage

Deviation for Dynamic

Load Step

Load: 0A to 6.5A and 6.5A to 0A at 6.5A/µs, Figure 44 Circuit,

VOUTn = 1V, VIN = 12V (Note 12)

50

mV

tSETTLE

Settling Time for

Dynamic Load Step

Load: 0A to 6.5A and 6.5A to 0A at 6.5A/µs, Figure 44 Circuit,

VOUTn = 1V, VIN = 12V (Note 12)

35

µs

IOUTn(OCL_PK)

Output Current Limit,

Peak

Cycle-by-Cycle Inductor Peak Current Limit Inception

22.5

A

IOUTn(OCL_AVG)

Output Current Limit,

Time Averaged

Time-Averaged Output Inductor Current Limit Inception Threshold,

Commanded by IOUT_OC_FAULT_LIMITn (Note 12)

15.6A; See IO-RB-ACC

Specification (Output Current

Readback Accuracy)

Control Section

VFBCM0

Channel 0 Feedback Input

Common Mode Range

VOSNS0– Valid Input Range (Referred to SGND)

VOSNS0+ Valid Input Range (Referred to SGND)

l

–0.1

0.3

4.25

V

VFBCM1

Channel 1 Feedback Input

Common Mode Range

SGND Valid Input Range (Referred to GND)

VOSNS1 Valid Input Range (Referred to SGND)

l

–0.3

0.3

5.5

V

VOUT0-RNG0

Channel 0 Full-Scale

Command Voltage,

Range 0

(Notes 7, 15)

VOUT0 Commanded to 4.095V, MFR_PWM_CONFIG[6] = 0b

Resolution

LSB Step Size

4.015

12

1.375

4.176

V

Bits

mV

VOUT0-RNG1

Channel 0 Full-Scale

Command Voltage,

Range 1

(Notes 7, 15)

VOUT0 Commanded to 2.750V, MFR_PWM_CONFIG[6] = 1b

Resolution

LSB Step Size

2.711

12

0.6875

2.788

V

Bits

mV

VOUT1-RNG0

Channel 1 Full-Scale

Command Voltage,

Range 0

(Notes 7, 15)

VOUT1 Commanded to 5.500V, MFR_PWM_CONFIG[5] = 0b

Resolution

LSB Step Size

5.422

12

1.375

5.576

V

Bits

mV

VOUT1-RNG1

Channel 1 Full-Scale

Command Voltage,

Range 1

(Notes 7, 15)

VOUT1 Commanded to 2.750V, MFR_PWM_CONFIG[5] = 1b

Resolution

LSB Step Size

2.711

12

0.6875

2.788

V

Bits

mV

RVSENSE0+

VOSNS0+ Impedance to

SGND

0.05V ≤ VVOSNS0+ – VSGND ≤ 4.1V

41

kΩ

RVSENSE1

VOSNS1 Impedance to

SGND

0.05V ≤ VVOSNS1 – VSGND ≤ 5.5V

37

kΩ

tON(MIN)

Minimum On-Time

(Note 8 )

90

ns

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,

Channels 0 and 1

(Note 15)

8

Bits

V0OU-RNG

Output Voltage

Comparator Threshold

Detection Range,

Channel 0

(Note 15)

High Range Scale, MFR_PWM_CONFIG[6] = 0b

Low Range Scale, MFR_PWM_CONFIG[6] = 1b

1

0.5

4.095

2.7

V

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