EXPOSED PAD (PIN 25) NOT GUARANTEED LOW IMPEDANCE TO GND,
ELECTRICAL CONNECTION OPTIONAL
ORDER INFORMATION
LEAD FREE FINISH
LTC4280CUFD#PBF
LTC4280IUFD#PBF
LEAD BASED FINISH
LTC4280CUFD
LTC4280IUFD
TAPE AND REEL
LTC4280CUFD#TRPBF
LTC4280IUFD#TRPBF
TAPE AND REEL
LTC4280CUFD#TR
LTC4280IUFD#TR
PART MARKING*
4280
4280
PART MARKING*
4280
4280
PACKAGE DESCRIPTION
24-Lead (4mm
×
5mm) Plastic QFN
24-Lead (4mm
×
5mm) Plastic QFN
PACKAGE DESCRIPTION
24-Lead (4mm
×
5mm) Plastic QFN
24-Lead (4mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
4280f
2
LTC4280
ELECTRICAL CHARACTERISTICS
SYMBOL
Supplies
V
DD
V
OV(VDD)
I
DD
V
DD(UVL)
V
DD(HYST)
INTV
CC
INTV
CC(UVL)
INTV
CC(HYST)
Input Supply Range
Input Supply Overvoltage Threshold
Input Supply Current
Input Supply Undervoltage Lockout
Input Supply Undervoltage Lockout Hysteresis
Internal Regulator Voltage
INTV
CC
Undervoltage Lockout
INTV
CC
Undervoltage Lockout Hysteresis
Circuit Breaker Threshold (V
DD
– V
SENSE
)
Current Limit Voltage (V
DD
– V
SENSE
)
SENSE
+/–
Input Current
V
FB
= 1.3V
V
FB
= 0V
V
SENSE
= 12V
V
DD
≥ 3.3V
INTV
CC
Rising
V
DD
Rising
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
2.9
15
2.75
75
2.9
2.55
20
22.5
22.5
7
10
4.7
–15
0.8
300
15.6
3
2.84
100
3.1
2.64
55
25
26
10
20
5.9
–20
1
450
0.5
3.8
1.210
60
1.215
50
1.215
10
1.215
60
0.33
60
1.215
3
0.8
4.3
1.235
128
0
1.235
128
0
1.235
30
0
1.235
80
0
0.4
125
1.235
8
0
1
TYP
MAX
15
16.5
5
2.89
125
3.4
2.79
75
27.5
29.5
13.5
35
6.5
–30
1.6
700
1
4.7
1.26
180
±1
1.255
200
±1
1.255
40
±1
1.255
100
±1
0.47
210
1.255
15
±1
1.2
UNITS
V
V
mA
V
mV
V
V
mV
mV
mV
mV
μA
V
μA
mA
mA
μs
V
V
mV
μA
V
mV
μA
V
mV
μA
V
mV
μA
V
mV
V
mV
μA
V
4280f
Current Limit and Circuit Breaker
Δ
V
SENSE(TH)
Δ
V
SENSE
I
SENSE(IN)
Gate Drive
Δ
V
GATE
I
GATE(UP)
I
GATE(DN)SLOW
I
GATE(DN)FAST
t
PHL(SENSE)
V
GS(POWERBAD)
V
ON(TH)
External N-Channel Gate Drive (V
GATE
– V
SOURCE
) V
DD
= 2.9V to 15V
(Note 3)
External N-Channel Gate Pull-Up Current
External N-Channel Gate Pulldown Current
Pulldown Current From GATE to SOURCE
During OC/UVLO
(V
DD
– SENSE) High to GATE Low
Gate-Source Voltage for Power Bad Fault
ON Pin Threshold Voltage
ON Pin Hysteresis
ON Pin Input Current
EN
Input Threshold
EN
Hysteresis
EN
Pin Input Current
OV Pin Threshold Voltage
OV Pin Hysteresis
OV Pin Input Current
UV Pin Threshold Voltage
UV Pin Hysteresis
UV Pin Input Current
UV Pin Reset Threshold Voltage
UV Pin Reset Threshold Hysteresis
Foldback Pin Power Good Threshold
FB Pin Power Good Hysteresis
Foldback Pin Input Current
GPIO Pin Input Threshold
FB = 1.8V
V
GPIO
Rising
FB Rising
V
UV
= 1.8V
V
UV
Falling
V
OV
= 1.8V
V
UV
Rising
EN
= 3.5V
V
OV
Rising
V
ON
= 1.2V
V
EN
= Rising
Gate On, V
GATE
= 0V
Gate Off, V
GATE
= 15V
V
DD
– SENSE = 100mV, V
GS
= 4V
V
DD
– SENSE = 100mV, C
GS
= 10nF
V
SOURCE
= 2.9V – 15V
V
ON
Rising
Comparator Inputs
Δ
V
ON(HYST)
I
ON(IN)
V
EN(TH)
Δ
V
EN(HYST)
I
EN
V
OV(TH)
Δ
V
OV(HYST)
I
OV(IN)
V
UV(TH)
Δ
V
UV(HYST)
I
UV(IN)
V
UV(RTH)
Δ
V
UV(RHYST)
V
FB
Δ
V
FB(HYST)
I
FB
V
GPIO(TH)
3
LTC4280
ELECTRICAL CHARACTERISTICS
SYMBOL
V
GPIO(OL)
I
GPIO(OH)
I
SOURCE
t
P(GATE)
t
D(GATE)
PARAMETER
GPIO Pin Output Low Voltage
GPIO Pin Input Leakage Current
SOURCE Pin Input Current
Input (ON, OV, UV,
EN)
to GATE Off
Propagation Delay
Turn-On Delay
ON
UV, OV,
EN
Overcurrent Auto-Retry
Other Pin Functions
I
GPIO
= 5mA
V
GPIO
= 15V
SOURCE = 15V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
CONDITIONS
MIN
TYP
0.25
0
40
80
3
1
100
5
0.2
1.235
–100
2
50
1.235
–10
2
0.6
MAX
0.5
±1
120
5
2
150
75
0.23
1.26
–120
2.6
60
1.27
–12.5
3.5
1.2
V
μA
μA
mA
Bits
0.5
0.2
0.2
2
1.25
1.25
±2.0
±1.0
±1.0
±5.5
±5.0
±5.0
±5.5
±5.0
±5.0
37.625
15.14
1.205
1
38.45
15.44
1.23
2
0
10
±0.1
39.275
15.74
1.255
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
mV
V
V
MΩ
μA
Hz
UNITS
V
μA
μA
μs
μs
ms
s
V
V
μA
μA
50
2.5
0.17
1.2
–80
1.4
40
1.2
–7.5
1
.03
8
–2
–1.25
–1.25
V
TIMERL(TH)
V
TIMERH(TH)
I
TIMER(UP)
I
TIMER(DOWN)
V
FILTER(TH)
I
FILTER
Timer Low Threshold
Timer High Threshold
TIMER Pin Pull-Up Current
TIMER Pin Pulldown Current for OC Auto-Retry
FILTER High Threshold
FILTER Timer Current
During OC FILTER = 0.5V
After OC FILTER = 0.5V
During Startup FILTER = 0.5V
I
TIMER(UP/DOWN)
TIMER Current Up/Down Ratio
ADC
RES
INL
Resolution (No Missing Codes)
Integral Nonlinearity
V
DD
– SENSE (Note 5)
SOURCE
ADIN
V
DD
– SENSE
SOURCE
ADIN
V
DD
– SENSE
SOURCE
ADIN
V
DD
– SENSE
SOURCE
ADIN
V
DD
– SENSE
SOURCE
ADIN
V
ADIN
= 1.28V
V
ADIN
= 1.28V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
V
OS
Offset Error (Note 4)
TUE
Total Unadjusted Error
FSE
Full-Scale Error
V
FS
Full-Scale Voltage (255 • V
LSB
)
R
ADIN
I
ADIN
ADIN Pin Sampling Resistance
ADIN Pin Input Current
Conversion Rate
4280f
4
LTC4280
ELECTRICAL CHARACTERISTICS
SYMBOL
I
2
C Interface
V
ADR(H)
I
ADR(IN,Z)
V
ADR(L)
I
ADR(IN)
I
ALERT
V
ALERT(OL)
V
SDA,SCL(TH)
I
SDA,SCL(OH)
V
SDA(OL)
f
SCL(MAX)
t
BUF(MIN)
t
HD,STA(MIN)
t
SU,STA(MIN)
t
SU,STO(MIN)
t
HD,DAT(MIN)
t
HD,DATO
t
SU,DAT(MIN)
t
SP
C
X
ADR0, ADR1, ADR2 Input High Voltage
ADR0, ADR1, ADR2 Hi-Z Input Current
ADR0, ADR1, ADR2 Input Low Voltage
ADR0, ADR1, ADR2 Input Current
ALERT
Input Current
ALERT
Output Low Voltage
SDA, SCL Input Threshold
SDA, SCL Input Current
SDA Output Low Voltage
SCL Clock Frequency
Bus Free Time Between Stop/Start Condition
Hold Time After (Repeated) Start Condition
Repeated Start Condition Set-Up Time
Stop Condition Set-Up Time
Data Hold Time (Input)
Data Hold Time (Output)
Data Set-Up Time
Suppressed Spike Pulse Width
SCL, SDA Input Capacitance
SDAI Tied to SDAO (Note 6)
SCL, SDA = 6.5V
I
SDA
= 3mA
Operates with f
SCL
≤ f
SCL(MAX)
ADR0, ADR1, ADR2 = 0V, INTV
CC
ALERT
= 6.5V
I
ALERT
= 3mA
ADR0, ADR1, ADR2 = 0.8V
ADR0, ADR1, ADR2 = INTV
CC
– 0.8V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
INTV
CC
–0.8
3
0.2
–80
0.2
1.3
1.7
0.2
400
1000
0.12
30
30
140
30
300
50
500
30
110
1.3
600
600
600
100
900
600
250
10
0.4
0.8
80
±1
0.4
1.9
±1
0.4
TYP
INTV
CC
–0.4
MAX
INTV
CC
–0.2
–3
UNITS
V
μA
μA
V
μA
μA
V
V
μA
V
kHz
μs
ns
ns
ns
ns
ns
ns
ns
pF
I
2
C Interface Timing
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into pins are positive; all voltages are referenced to
GND unless otherwise specified.
Note 3:
An internal clamp limits the GATE pin to a minimum of 5V above
SOURCE. Driving this pin to voltages beyond the clamp may damage the device.
Note 4:
Offset error is the offset voltage measured from 1LSB when the
output code flickers between 0000 0000 and 0000 0001.
Note 5:
Integral nonlinearity is defined as the deviation of a code from a
precise analog input voltage. Maximum specifications are limited by the
LSB step size and the single shot measurement. Typical specifications are
measured from the 1/4, 1/2 and 3/4 areas of the quantization band.
1 Introduction
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