Changes to Ordering Guide .......................................................... 23
2/08—Rev. A to Rev. B
Changed V
VCC
to V
CC
Throughout ................................................. 3
Changes to Input Current for 00 Decode, I
ADRLOW
Parameter ......... 3
Changes to Input Current for 11 Decode, I
ADRHIGH
Parameter ........ 3
Added ADC Conversion Time Parameter .................................... 4
Added Fast Overcurrent Response Time Parameter ................... 4
Added Endnote 2 and Endnote 3 ................................................... 4
Changes to Figure 14 ........................................................................ 8
Changes to Figure 15 Caption......................................................... 8
Changes to Figure 24 ...................................................................... 10
Changes to TIMER Function Section .......................................... 12
Changes to Table 5 .......................................................................... 15
Changes to General I
2
C Timing Section...................................... 15
Changes to Quick Command Section ......................................... 17
Changes to Figure 35 ...................................................................... 17
Changes to Table 7.......................................................................... 17
Changes to Write Extended Command Byte Section ................ 18
Changes to Figure 39...................................................................... 18
Changes to Table 9 and Table 11 .................................................. 18
Changes to Converting ADC Codes to Voltage and
Current Readings Section.............................................................. 19
4/07—Rev. 0 to Rev. A
Changes to GATE and TIMER Functions During
a Hot Swap Section ......................................................................... 14
Changes to Calculating Current Limits and Fault Current
Limit Time Section ......................................................................... 14
Changes to Initial Timing Cycle Section ..................................... 14
Changes to Soft Start (SS Pin) Section ........................................ 15
Changes to Table 5.......................................................................... 16
Changes to Figure 34 and Figure 35 ............................................ 17
Changes to Figure 39...................................................................... 19
Changes to Figure 41 and Figure 42 ............................................ 20
Added Applications Information Heading ................................. 22
9/06—Revision 0: Initial Version
Rev. C | Page 2 of 24
Data Sheet
SPECIFICATIONS
V
CC
= 3.15 V to 16.5 V; T
A
= −40°C to +85°C; typical values at T
A
= 25°C, unless otherwise noted.
Table 1.
Parameter
VCC PIN
Operating Voltage Range, V
CC
Supply Current, I
CC
Undervoltage Lockout, V
UVLO
Undervoltage Lockout Hysteresis, V
UVLOHYST
ON PIN
Input Current, I
INON
Rising Threshold, V
ONTH
Trip Threshold Hysteresis, V
ONHYST
Glitch Filter Time
SS PIN
Pull-Up Current, I
ISSPU
Current Setting Gain, GAIN
SS
Soft Start Completion Voltage, SS
HIGHV
Pull-Down Current, I
ISSPD
SENSE PIN
Input Leakage, I
SENSE
Overcurrent Fault Timing Threshold, V
OCTRIM
Overcurrent Limit Threshold, V
LIM
Fast Overcurrent Trip Threshold, V
OCFAST
GATE PIN
Drive Voltage, V
GATE
Min
3.15
1.7
2.8
80
−100
−2
1.26
35
Typ
Max
16.5
2.5
Unit
V
mA
V
mV
nA
µA
V
mV
µs
µA
V/V
V
µA
µA
mV
mV
mV
Conditions
ADM1177
V
CC
rising
1.3
50
3
10
10
1
70
+100
+2
1.34
65
ON < 1.5 V
ON rising
9.5
10.5
V
SS
= 0 V to 1 V
V
SS
/V
CB
; V
SS
= 0.5 V to 1 V
SS continues to pull up beyond 1 V
Under fault
V
SENSE
= V
CC
V
OCTRIM
= (V
CC
− V
SENSE
), fault timing starts on
the TIMER pin
V
LIM
= (V
CC
− V
SENSE
), closed-loop regulation
to a current limit
V
OCFAST
= (V
CC
− V
SENSE
), gate pull-down
current turned on
V
GATE
− V
CC
, V
CC
= 3.15 V
V
GATE
− V
CC
, V
CC
= 5 V
V
GATE
− V
CC
, V
CC
= 16.5 V
V
GATE
= 0 V
V
GATE
= 3 V, V
CC
= 3.15 V
V
GATE
= 3 V, V
CC
= 5 V
V
GATE
= 3 V, V
CC
= 16.5 V
Initial cycle, V
TIMER
= 1 V
During current fault, V
TIMER
= 1 V
After current fault and during a cooldown
period on a retry device, V
TIMER
= 1 V
Normal operation, V
TIMER
= 1 V
TIMER rising
TIMER falling
Low state
Resistor to ground state, load pin with
specified resistance for 01 decode
Open state, maximum load allowed on the
ADR pin for 10 decode
High state
V
ADR
= 0 V to 0.8 V
V
ADR
= 2.0 V to 5.5 V
−1
92
97
100
+1
103
115
Pull-Up Current
Pull-Down Current
3
9
7
8
6
11
10
12.5
1.5
5
7
−5
−60
2
100
1.3
0.2
9
13
13
17
V
V
V
µA
mA
mA
mA
µA
µA
µA
µA
V
V
V
kΩ
µA
V
µA
µA
TIMER PIN
Pull-Up Current (Power-On Reset), I
TIMERUPPOR
Pull-Up Current (Fault Mode), I
TIMERUPFAULT
Pull-Down Current (Retry Mode), I
TIMERDNRETRY
Pull-Down Current, I
TIMERDN
Trip Threshold High, V
TIMERH
Trip Threshold Low, V
TIMERL
ADR PIN
Set Address to 00, V
ADRLOWV
Set Address to 01, R
ADRLOWZ
Set Address to 10, I
ADRHIGHZ
Set Address to 11, V
ADRHIGHV
Input Current for 00 Decode, I
ADRLOW
Input Current for 11 Decode, I
ADRHIGH
−3.5
−40
−6.5
−80
3
1.26
0.175
0
135
−1
2
−40
1.34
0.225
0.8
165
+1
5.5
150
−22
3
10
Rev. C | Page 3 of 24
ADM1177
Parameter
MONITORING ACCURACY
1
Current Sense Absolute Accuracy
0°C to +70°C
Min
Typ
Max
Unit
Conditions
Data Sheet
0°C to +85°C
−40°C to +85°C
−1.45
−1.8
−2.8
−5.7
−1.5
−1.8
−2.95
−6.1
−1.95
−2.45
−3.85
−6.7
105.84
−0.85
−0.9
−0.85
−0.9
−0.9
−1.15
6.65
26.35
+1.45
+1.8
+2.8
+5.7
+1.5
+1.8
+2.95
+6.1
+1.95
+2.45
+3.85
+6.7
V
SENSE
for ADC Full Scale
2
Voltage Sense Accuracy
0°C to +70°C
0°C to +85°C
−40°C to +85°C
V
CC
for ADC Full Scale
3
Low Range (VRANGE = 1)
High Range (VRANGE = 0)
2
I C TIMING
Low Level Input Voltage, V
IL
High Level Input Voltage, V
IH
Low Level Output Voltage on SDA, V
OL
Output Fall Time on SDA from V
IHMIN
to V
ILMAX
Maximum Width of Spikes Suppressed by Input
Filtering on SDA and SCL Pins
Input Current, I
I
, on SDA/SCL When Not
Driving a Logic Low Output
Input Capacitance on SDA/SCL
SCL Clock Frequency, f
SCL
Low Period of the SCL Clock
High Period of the SCL Clock
Setup Time for a Repeated Start Condition, t
SU;STA
SDA Output Data Hold Time, t
HD;DAT
ADC Conversion Time
4
Fast Overcurrent Response Time
5
Setup Time for a Stop Condition, t
SU;STO
Bus Free Time Between a Stop and a Start
Condition, t
BUF
Capacitive Load for Each Bus Line
1
%
%
%
%
%
%
%
%
%
%
%
%
mV
%
%
%
%
%
%
V
V
V
SENSE
= 75 mV
V
SENSE
= 50 mV
V
SENSE
= 25 mV
V
SENSE
= 12.5 mV
V
SENSE
= 75 mV
V
SENSE
= 50 mV
V
SENSE
= 25 mV
V
SENSE
= 12.5 mV
V
SENSE
= 75 mV
V
SENSE
= 50 mV
V
SENSE
= 25 mV
V
SENSE
= 12.5 mV
+0.85
+0.9
+0.85
+0.9
+0.9
+1.15
V
CC
= 3 V minimum (low range)
V
CC
= 6 V minimum (high range)
V
CC
= 3 V minimum (low range)
V
CC
= 6 V minimum (high range)
V
CC
= 3 V minimum (low range)
V
CC
= 6 V minimum (high range)
0.3 V
BUS
0.7 V
BUS
20 + 0.1 C
BUS
50
−10
5
400
600
1300
600
100
150
4
600
1300
400
0.4
250
250
+10
V
V
V
ns
ns
µA
pF
kHz
ns
ns
ns
ns
µs
µs
ns
ns
pF
V
BUS
= 3.0 V to 5.5 V
V
BUS
= 3.0 V to 5.5 V
I
OL
= 3 mA
C
BUS
= bus capacitance from SDA to GND
900
10
Monitoring accuracy is a measure of the error in a code that is read back for a particular voltage/current. This is a combination of amplifier error, reference error, ADC
error, and error in ADC full-scale code conversion factor.
2
This is an absolute value to be used when converting ADC codes to current readings; any inaccuracy in this value is factored into absolute current accuracy values (see
specifications for Current Sense Absolute Accuracy).
3
These are absolute values to be used when converting ADC codes to voltage readings; any inaccuracy in these values are factored into voltage accuracy values (see
specifications for Voltage Sense Accuracy).
4
Time between the receipt of the command byte and the actual ADC result being placed in the register.
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