LTC4228C ................................................ 0°C to 70°C
LTC4228I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
GN Package ...................................................... 300°C
pin conFiguraTion
STATUS1
TOP VIEW
PWRGD1
DGATE1
HGATE1
STATUS1
CPO1
DGATE1
22
FAULT1
21 ON1
20
EN1
29
19 TMR1
18 TMR2
17
EN2
16 ON2
15
FAULT2
9 10 11 12 13 14
CPO2
DGATE2
STATUS2
HGATE2
OUT2
PWRGD2
SENSE1
–
SENSE1
+
IN1
INTV
CC
GND
IN2
SENSE2
–
TOP VIEW
1
2
3
4
5
6
7
8
9
11
28 HGATE1
27 OUT1
26
PWRGD1
25
FAULT1
24 ON1
23
EN1
22 TMR1
21 TMR2
20
EN2
19 ON2
18
FAULT2
17
PWRGD2
16 OUT2
15 HGATE2
OUT1
28 27 26 25 24 23
SENSE1
–
1
SENSE1
+
2
IN1 3
INTV
CC
4
GND 5
IN2 6
SENSE2
+
7
SENSE2
–
8
CPO1
SENSE2
+
10
DGATE2 12
CPO2 13
STATUS2
14
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W (NOTE 5)
EXPOSED PAD (PIN 29) PCB GND CONNECTION OPTIONAL
GN PACKAGE
28-LEAD PLASTIC SSOP NARROW
T
JMAX
= 125°C,
θ
JA
= 80°C/W
422812f
2
LTC4228-1/LTC4228-2
orDer inForMaTion
LEAD FREE FINISH
LTC4228CUFD-1#PBF
LTC4228CUFD-2#PBF
LTC4228IUFD-1#PBF
LTC4228IUFD-2#PBF
LTC4228CGN-1#PBF
LTC4228CGN-2#PBF
LTC4228IGN-1#PBF
LTC4228IGN-2#PBF
TAPE AND REEL
LTC4228CUFD-1#TRPBF
LTC4228CUFD-2#TRPBF
LTC4228IUFD-1#TRPBF
LTC4228IUFD-2#TRPBF
LTC4228CGN-1#TRPBF
LTC4228CGN-2#TRPBF
LTC4228IGN-1#TRPBF
LTC4228IGN-2#TRPBF
PART MARKING*
42281
42282
42281
42282
LTC4228GN-1
LTC4228GN-2
LTC4228GN-1
LTC4228GN-2
PACKAGE DESCRIPTION
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
elecTrical characTerisTics
SYMBOL
Supplies
V
IN
I
IN
V
INTVCC
V
INTVCC(UVL)
Input Supply Range
Input Supply Current
Internal Regulator Voltage
Internal V
CC
Undervoltage Lockout
PARAMETER
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, unless otherwise noted.
CONDITIONS
l
l
MIN
2.9
TYP
MAX
18
UNITS
V
mA
V
V
mV
mV
V
V
V
µA
µA
A
A
2.5
4.5
2.1
30
10
5
10
0.3
–60
–50
5
2.2
60
25
7
12
0.7
–95
–85
–1.5
1.5
5
5.6
2.3
90
40
14
14
1.1
–120
–110
I = 0, –500µA
INTV
CC
Rising
l
l
l
∆V
INTVCC(HYST)
Internal V
CC
Undervoltage Lockout Hysteresis
Ideal Diode Control
∆V
FWD(REG)
∆V
DGATE
∆V
DGATE(ST)
I
CPO(UP)
I
DGATE(FPU)
I
DGATE(FPD)
t
ON(DGATE)
t
OFF(DGATE)
∆V
SENSE(CB)
∆V
SENSE(ACL)
V
SENSE+(UVL)
∆V
SENSE+(HYST)
I
SENSE+
I
SENSE–
∆V
HGATE
Forward Regulation Voltage (V
INn
– V
OUTn
)
External N-Channel Gate Drive
(V
DGATEn
– V
INn
)
Diode MOSFET On Detect Threshold
CPOn Pull-Up Current
DGATEn Fast Pull-Up Current
DGATEn Fast Pull-Down Current
DGATEn Turn-On Delay
DGATEn Turn-Off Delay
Circuit Breaker Trip Sense Voltage
(V
SENSEn+
– V
SENSEn–
)
Active Current Limit Sense Voltage
(V
SENSEn+
– V
SENSEn–
)
SENSEn
+
Undervoltage Lockout
SENSEn
+
Input Current
SENSEn
–
Input Current
External N-Channel Gate Drive
(V
HGATEn
– V
OUTn
)
SENSEn
+
Undervoltage Lockout Hysteresis
SENSE
+
= 12V
SENSE
–
= 12V
IN < 7V, I = 0, –1µA
IN = 7V to 18V, I = 0, –1µA
IN < 7V,
∆V
FWD
= 0.1V, I = 0, –1µA
IN = 7V to 18V,
∆V
FWD
= 0.1V, I = 0, –1µA
STATUS
Pulls Low,
∆V
FWD
= 50mV
CPO = IN = 2.9V
CPO = IN = 18V
∆V
FWD
= 0.2V,
∆V
DGATE
= 0V, CPO = 17V
∆V
FWD
= –0.2V,
∆V
DGATE
= 5V
∆V
FWD
= 0.2V, C
DGATE
= 10nF
∆V
FWD
= –0.2V, C
DGATE
= 10nF
l
l
l
l
l
l
l
l
0.25
0.2
47.5
55
1.75
10
150
10
4.8
10
50
65
1.9
50
350
50
7
12
0.5
0.5
52.5
75
2.05
90
500
100
14
14
µs
µs
mV
mV
V
mV
µA
µA
V
V
422812f
Hot Swap Control
l
l
SENSE
+
Rising
l
l
l
l
l
l
3
LTC4228-1/LTC4228-2
elecTrical characTerisTics
SYMBOL
∆V
HGATE(PG)
I
HGATE(UP)
I
HGATE(DN)
I
HGATE(FPD)
t
PHL(SENSE)
t
OFF(HGATE)
t
D(HGATE)
t
P(HGATE)
Input/Output Pin
V
ON(TH)
∆V
ON(HYST)
V
ON(RESET)
I
ON(LEAK)
V
EN(TH)
∆V
EN(HYST)
I
EN(UP)
V
TMR(TH)
I
TMR(UP)
I
TMR(DN)
I
TMR(RATIO)
I
OUT
V
OL
V
OH
I
OH
I
PU
t
RST(ON)
ONn Threshold Voltage
ONn Hysteresis
ONn Fault Reset Threshold Voltage
ONn Input Leakage Current
ENn
Threshold Voltage
ENn
Hysteresis
ENn
Pull-Up Current
TMRn Threshold Voltage
TMRn Pull-Up Current
TMRn Pull-Down Current
TMRn Current Ratio I
TMR(DN)
/I
TMR(UP)
OUTn Current
Output Low Voltage
(FAULTn,
PWRGDn, STATUSn)
Output High Voltage
(FAULTn,
PWRGDn, STATUSn)
Input Leakage Current
(FAULTn,
PWRGDn, STATUSn)
Output Pull-Up Current
(FAULTn,
PWRGDn, STATUSn)
ONn Low to
FAULTn
High
OUT = 11V, IN = 12V, ON = 2V
OUT = 13V, IN = 12V, ON = 2V
I = 1mA
I = –1µA
V = 18V
V = 1.5V
EN
= 1V
TMR Rising
TMR Falling
TMR = 1V, In Fault Mode
TMR = 2V, No Faults
ON Falling
ON = 5V
EN
Rising
ON Rising
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
IN
= 12V, unless otherwise noted.
PARAMETER
Gate-Source Voltage for Power Good
External N-Channel Gate Pull-Up Current
External N-Channel Gate Pull-Down Current
External N-Channel Gate Fast
Pull-Down Current
Sense Voltage (SENSEn
+
– SENSEn
–
)
High to HGATEn Low
ENn
High to HGATEn Low
ONn Low to HGATEn Low
SENSEn
+
Low to HGATEn Low
ONn High,
ENn
Low to HGATEn
Turn-On Delay
ONn to HGATEn Propagation Delay
ON = Step 0.8V to 2V
Gate Drive On, HGATE = 0V
Gate Drive Off, OUT = 12V,
HGATE = OUT + 5V
Fast Turn-Off, OUT = 12V,
HGATE = OUT + 5V
∆V
SENSE
= 300mV, C
HGATE
= 10nF
CONDITIONS
l
l
l
l
l
l
l
l
l
l
MIN
3.6
–7
150
100
TYP
4.2
–10
300
200
0.5
20
10
10
MAX
4.8
–13
500
300
1
40
20
20
150
20
1.26
140
0.63
±1
1.284
200
–13
1.272
0.25
–125
2.6
2.7
120
5
0.4
UNITS
V
µA
µA
mA
µs
µs
µs
µs
ms
µs
V
mV
V
µA
V
mV
µA
V
V
µA
µA
%
µA
mA
V
V
50
100
10
1.21
40
0.55
1.185
40
–7
1.198
0.15
–75
1.4
1.4
1.235
80
0.6
0
1.235
130
–10
1.235
0.2
–100
2
2
50
2.5
0.15
l
INTV
CC
– 1 INTV
CC
– 0.5
l
l
l
0
–7
–10
20
±1
–13
40
µA
µA
µs
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 device pins are positive; all currents out of device
pins are negative. All voltages are referenced to GND unless otherwise
specified.
Note 3:
An internal clamp limits the DGATE and CPO pins to a minimum of
10V above and a diode below IN. Driving these pins to voltages beyond the
clamp may damage the device.
Note 4:
An internal clamp limits the HGATE pin to a minimum of 10V
above and a diode below OUT. Driving this pin to voltages beyond the
clamp may damage the device.
Note 5:
Thermal resistance is specified when the exposed pad is soldered
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