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ELECTRICAL CHARACTERISTICS
operating temperature range (Note 2). Specified as each individual output channel (Note 4). T
RUNP = 0, FREQUENCY_SWITCH = 350kHz and V
EEPROM settings and per Test Circuit 1, unless otherwise noted.
SYMBOL
PARAMETER
V
Input DC Voltage
INnn
V
Range of Output Voltage Regulation
OUTn
for Each Channel
V
Output Voltage, Total Variation with
OUTn(DC)
Line and Load for Each Channel
V
Undervoltage Lockout Threshold,
UVLO
When V
< 4.3V
IN
Input Specifications
I
Input Inrush Current at
INRUSH(VINn)
Start-Up
I
Input Supply Bias Current
Q(SVIN)
I
Input Supply Current in Pulse-
S(VINn,PSM)
Skipping Mode Operation
I
Input Supply Current in Forced-
S(VINn,FCM)
Continuous Mode Operation
I
Input Supply Current in Shutdown
S(VINn,SHUTDOWN)
Output Specifications
I
Output Continuous Current Range
OUTn
Each Channel
∆V
Line Regulation Accuracy Each
OUTn(LINE)
Channel
V
OUTn
∆V
Load Regulation Accuracy Each
OUTn(LOAD)
Channel
V
OUTn
V
Output Voltage Ripple
OUTn(AC)
f
(Each Channel) V
Ripple Frequency
S
OUTn
∆V
Turn-On Overshoot
OUTn(START)
t
Turn-On Start-Up Time
START
t
Turn-On Delay Time
DELAY(0ms)
∆V
Peak Output Voltage Deviation for
OUTn(LS)
Dynamic Load Step
The
denotes the specifications which apply over the specified internal
l
commanded to 1.000V unless otherwise noted. Configured with factory-default
OUTn
CONDITIONS
Test Circuit 1
Test Circuit 2; VIN_OFF < VIN_ON = 4V
V
Differentially Sensed on V
OUTn
Commanded by Serial Bus or with Resistors Present at
Start-Up on V
OUTn_CFG
Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b)
V
Commanded to 1.000V, V
OUTn
(MFR_PWM_MODEn[1] = 1b) (Notes 5, 6)
V
Falling
INTVCC_nn
V
Rising
INTVCC_nn
Test Circuit 1, V
=1V, V
OUTn
IN
Capacitors; TON_RISE
= 3ms
n
Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b
RUNn = 3.3V
Shutdown, RUN0 = RUN1 = 0V
Pulse-Skipping Mode, MFR_PWM_MODEn[0] = 0b,
I
= 100mA
OUTn
Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b
12V to 1V
I
= 31.25A
OUTn
Shutdown, RUNn = 0V
(Note 6) Utilizing MFR_PWM_MODE[7] = 1 and Using
~I
= 40A for IOUT_OC_FAULT_LIMIT, Page 98
OUT
Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b)
SV
and V
Electrically Shorted Together and INTV
IN
INn
Open Circuit; I
= 0A, 5.75V ≤ V
OUTn
(MFR_PWM_MODEn[1] = 1b), FREQUENCY_SWITCH =
350kHz (Note 5)
Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b)
Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b)
0A ≤ I
≤ 31.25A, V
Low Range, (MFR_PWM_
OUTn
OUT
MODEn[1] = 1b) (Notes 5, 6)
FREQUENCY_SWITCH Set to 350kHz (0xFABC)
TON_RISEn = 3ms (Note 12)
Time from V
Toggling from 0V to 12V to Rising Edge
IN
PGOODn. TON_DELAYn = 0ms, TON_RISEn = 3ms
Time from First Rising Edge of RUNn to Rising Edge of
PGOODn . TON_DELAYn = 0ms, TON_RISEn = 3ms,
V
Having Been Established for at Least 70ms
IN
Load: 10A to 20A and 20A to 10A at 10A/µs,
V
= 1.2V, V
= 12V (Note 12) See Transient Graph
OUTn
IN
For more information
www.analog.com
= 25°C, V
= 12V, RUNn = 3.3V,
A
IN
l
l
+
–
/V
Pin-Pair;
l
OSNSn
OSNSn
l
Low Range
OUTn
= 12V; No Load Besides
l
CC
≤ 16V, V
Low Range
IN
OUT
l
l
l
l
LTM4681
MIN
TYP
MAX
UNITS
5.75
16
V
4.5
5.75
V
0.5
3.34
V
V
0.995
1.000
1.005
V
0.985
1.000
1.015
V
3.55
V
3.90
V
400
mA
25
mA
23
mA
20
mA
2.89
A
50
µA
0
31.25
A
0.03
%/V
0.03
±0.2
%/V
0.03
%
0.2
0.5
%
10
mV
P-P
320
350
370
kHz
8
mV
30
ms
2.75
3.3
3.8
ms
50
mV
Rev. A
5
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