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LTM4683
ELECTRICAL CHARACTERISTICS
operating temperature range (Note 2). Specified as each individual output channel (Note 4). T
RUNP = 12V, FREQUENCY_SWITCH = 425kHz and V
EEPROM settings and per Test Circuit 1, unless otherwise noted.
SYMBOL
PARAMETER
I
Output Current Limit, Peak High
OUTn(OCL_PK)
Range per Channel
I
Output Current Limit, Time Averaged
OUTn(OCL_AVG)
per Channel
Control Section
V
Channel 0 to Channel 3 Feedback
FBCMn
Input Common Mode Range
V
Full-Scale Command Voltage, Range
OUT-RNGL
Low (0.3V to 2.75V) per Channel;
Limit to 1V (Note 14)
+
+
R
V
Impedance to SGND
VSNSn
OSNSn
t
Minimum On-Time
ON(MIN)
R
Resolution
COMPn
Compensation Resistor R
Compensation Resistor R
g
Resolution
mn
Error Amplifier g
Error Amplifier g
LSB Step Size
Analog OV/UV (Overvoltage/Undervoltage) Output Voltage Supervisor Comparators (VOUT_OV/UV_FAULT_LIMIT and VOUT_OV/UV_WARN_LIMIT Monitors)
N
Resolution, Output Voltage
OV/UV_COMP
Supervisors
V
Output OV Comparator Threshold
OV-RNG
Detection Range
V
Output OV and UV Comparator
OUSTP
Threshold Programming LSB Step Size
V
Output OV Comparator Threshold
OV-ACC-n
Accuracy Channel 0 to Channel 3
(Note 13)
V
Output UV Comparator Threshold
UV-RNGn
Detection Range
V
Output UV Comparator Threshold
UV-ACCn
Accuracy Channel 0 to Channel 3
(Note 13)
t
Output OV Comparator
PROP-OV
Response Times
t
Output UV Comparator
PROP-UV
Response Times
6
The
commanded to 0.5V unless otherwise noted. Configured with factory-default
OUTn
CONDITIONS
Cycle-by-Cycle Inductor Peak Current Limit Inception,
Utilizing MFR_PWM_MODE[7] = 1, Using I
for IOUT_OC_FAULT_LIMIT, Page 96
Time-Averaged Output Inductor Current Limit Inception
Threshold, Commanded by IOUT_OC_FAULT_LIMITn,
(Note 12), Utilizing MFR_PWM_MODE[7] = 1, Using
~I
= 41.75A, Page 96
OUT
–
V
Valid Input Range (Referred to SGND)
OSNSn
+
V
Valid Input Range (Referred to SGND)
OSNSn
V
Commanded to 2.750V, MFR_PWM_MODEn[1] = 1b
OUTn
Set Point Accuracy
Resolution
LSB Step Size
0.3V ≤ V
VOSNSn
(Note 8 ) per Channel
MFR_PWM_COMP[4:0] = 0 to 31 (See Figure 1,
Note Section)
TH(MAX)
TH(MIN)
V
= 1.35V, MFR_PWM_COMP[7:5] = 0 to 7
COMP
m(MAX)
m(MIN)
(Notes 13, 14)
High Range Scale Not Used, Low Range Scale,
MFR_ PWM_ MODEn[1] = 1b (Note 14)
(Note 14),
Low Range Scale, MFR_PWM_MODEn[1] = 1b
0.3V ≤ V
VOSNSn
Low Range Scale, MFR_PWM_MODEn[1] = 1b,
High Range Scale N/A, Output Limited to 0.7V
0.3V ≤ V
VOSNSn
Overdrive to 10% Above Programmed Threshold
Under Drive to 10% Below Programmed Threshold
For more information
denotes the specifications which apply over the specified internal
l
A
OUT
+
– V
≤ 1.0V
SGND
+
–
– V
≤ 0.7V, MFR_PWM_MODEn[1] = 1b
VOSNSn
+
–
– V
≤ 0.7V, MFR_PWM_MODE[1] = 1b
VOSNSn
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= 25°C, V
, SV
= 12V, RUNn = 3.3V,
IN
IN
MIN
TYP
45
= 41.75A
40A, See I
OUT-RB-ACC
Specification (Output Current
Readback Accuracy)
–0.1
l
l
2.7
l
−0.5
l
12
0.688
50
85
5
62
0
3
5.76
1
0.68
9
0.3
5.6
l
0.3
l
MAX
UNITS
A
0.3
V
1.0
V
2.8
V
+0.5
%
Bits
mV
kΩ
ns
Bits
kΩ
kΩ
Bits
mmho
mmho
mmho
Bits
2.7
V
mV
±5
%
V
2.7
±5
%
100
µs
100
µs
Rev. 0
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