Datasheet
2
LTC4221
4221fa
(Note 1)
Supply Voltage (V
CC
n
) ............................................ 17V
SENSE
n
Pins ............................ – 0.3V to (V
CC
n
+ 0.3V)
FB, ON Pins .............................. –0.3V to (V
CC1
+ 0.3V)
TIMER Pin .................................................. –0.3V to 2V
GATE Pins (Note 3)................................... –0.3V to 21V
PWRGD, FAULT, FILTER Pins................... –0.3V to 17V
Operating Temperature Range
LTC4221C ............................................... 0°C to 70°C
LTC4221I............................................ – 40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
T
JMAX
= 125°C, θ
JA
= 130°C/W
ABSOLUTE MAXIMUM RATINGS
W
WW
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC1
Supply Voltage Channel 1 ● 2.7 13.5 V
V
CC2
Supply Voltage Channel 2 V
CC2
≤ V
CC1
● 1 13.5 V
I
CC1
V
CC1
Supply Current ON1, ON2 = 2V ● 2.2 3 mA
I
CC2
V
CC2
Supply Current ON1, ON2 = 2V ● 0.05 0.15 mA
V
CC1(UVL)
Undervoltage Lockout for Channel 1 V
CC1
Rising ● 2.1 2.5 2.675 V
ΔV
CC1(HYST)
Undervoltage Lockout Hysteresis 110 mV
V
CC2(UVL)
Undervoltage Lockout for Channel 2 V
CC2
Rising ● 0.65 0.8 0.975 V
ΔV
CC2(HYST)
Undervoltage Lockout Hysteresis 25 mV
I
SENSE1(IN)
SENSE1 Pin Input Current 0V ≤ V
SENSE1
≤ V
CC1
● ±0.03 ±5 μA
I
SENSE2(IN)
SENSE2 Pin Input Current V
SENSE2
= V
CC2
● ±0.2 ±5 μA
V
SENSE2
= 0V 1000 μA
V
SENSE(FC)
SENSE
n
Threshold Voltage Channel
n
Fast Comparator Threshold ● 85 100 115 mV
V
SENSE(SC)
SENSE
n
Threshold Voltage Channel
n
Slow Comparator Threshold 22.5 25 27.5 mV
● 20.5 25 29.5 mV
V
SENSE(ACL)
SENSE
n
Voltage at Active V
FB
n
= 0 4 9 16 mV
Current Limit V
FB
n
= 0.65V 17.5 25 32.5 mV
The ● indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC1
= 5V, V
CC2
= 3.3V, unless otherwise noted.
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
ON1
V
CC1
SENSE1
GATE1
FB1
PWRGD1
FAULT
FILTER
ON2
V
CC2
SENSE2
GATE2
FB2
PWRGD2
GND
TIMER
ELECTRICAL CHARACTERISTICS
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4221CGN#PBF LTC4221CGN#TRPBF 4221 16-Lead Plastic SSOP 0°C to 70°C
LTC4221IGN#PBF LTC4221IGN#TRPBF 4221I 16-Lead Plastic SSOP –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4221CGN LTC4221CGN#TR 4221 16-Lead Plastic SSOP 0°C to 70°C
LTC4221IGN LTC4221IGN#TR 4221I 16-Lead Plastic SSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER I FOR ATIO
UUW
PI CO FIGURATIO
UUU
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/