LTC2939C..................................................... 0°C to 70°C
LTC2939I .................................................. –40°C to 85°C
LTC2939H .............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering 10 sec)
MS Package Only .............................................. 300°C
PIN CONFIGURATION
LTC2938
V3
V1
CRT
RST
WDO
WDI
1
2
3
4
5
6
13
TOP VIEW
12 V2
11 V4
10 V
REF
9
8
7
V
PG
GND
CWT
MS PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 130°C/W
V3
V1
CRT
RST
WDO
WDI
1
2
3
4
5
6
LTC2938
TOP VIEW
12
11
10
9
8
7
V2
V4
V
REF
V
PG
GND
CWT
V5
V3
V1
NC
CRT
RST
WDO
WDI
1
2
3
4
5
6
7
8
LTC2939
TOP VIEW
16
15
14
13
12
11
10
9
V6
V2
V4
NC
V
REF
V
PG
GND
CWT
DE PACKAGE
12-LEAD (4mm 3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
MS PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 110°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC2938CDE#PBF
LTC2938IDE#PBF
LTC2938HDE#PBF
LTC2938CMS#PBF
LTC2938IMS#PBF
LTC2938HMS#PBF
LTC2939CMS#PBF
LTC2939IMS#PBF
LTC2939HMS#PBF
TAPE AND REEL
LTC2938CDE#TRPBF
LTC2938IDE#TRPBF
LTC2938HDE#TRPBF
LTC2938CMS#TRPBF
LTC2938IMS#TRPBF
LTC2938HMS#TRPBF
LTC2939CMS#TRPBF
LTC2939IMS#TRPBF
LTC2939HMS#TRPBF
PART MARKING*
2938
2938
2938
2938
2938
2938
2939
2939
2939
PACKAGE DESCRIPTION
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead (4mm
×
3mm) Plastic DFN
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°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/
293839ff
2
LTC2938/LTC2939
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC
V
CCMINP
V
RT50
V
RT33
V
RT25
V
RT18
V
RT15
V
RT12
V
RTA
V
RTAN
V
REF
V
PG
I
VPG
I
V1
I
V2
I
V3
I
V4
PARAMETER
Minimum Internal Operating Voltage
Minimum Required for Configuration
5V, 5% Reset Threshold
3.3V, 5% Reset Threshold
2.5V, 5% Reset Threshold
1.8V, 5% Reset Threshold
1.5V, 5% Reset Threshold
1.2V, 5% Reset Threshold
ADJ Reset Threshold
–ADJ Reset Threshold
Reference Voltage
Configuration Voltage Range
V
PG
Input Current
V1 Input Current
V2 Input Current
V3 Input Current
V4 Input Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 5V unless otherwise specified. (Note 3)
CONDITIONS
RST
in Correct Logic State
V
CC
Rising
V1 Input Threshold
V1, V2 Input Threshold
V2, V3 Input Threshold
V2, V3, V4 Input Threshold
V2, V3, V4 Input Threshold
V2, V3, V4 Input Threshold
V3, V4, V5, V6 Input Threshold
V4 Input Threshold
V
CC
> 2.3V, I
VREF
= ±1mA,
C
REF
< 1000pF
V
CC
> V
CCMINP
V
PG
= V
REF
V1 = 5V, I
VREF
= 12μA, (Note 4)
V2 = 3.3V
V3 = 2.5V
V3 = 0.55V (ADJ Mode)
V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = -0.02V (–ADJ Mode)
V5, V6 = 0.55V
V
CRT
= GND
V
CRT
= 1.3V
C
RT
= 1500pF
V
n
Less Than Reset Threshold V
RTX
by
More Than 1%
I
SINK
= 2.5mA; V
CC
= 3V
I
SINK
= 100μA; V
CC
= 1V
I
SINK
= 2.5mA; V
CC
= 3.3V
I
SOURCE
= –1μA; V2 = 3.3V
V
CWT
= GND
V
CWT
= 1.3V
C
WT
= 1500pF
Logic Low
Open
Logic High
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
MIN
TYP
MAX
1
2.6
UNITS
V
V
V
V
V
V
V
V
mV
mV
V
V
nA
μA
μA
μA
nA
μA
nA
nA
nA
μA
μA
ms
μs
4.600
3.036
2.300
1.656
1.380
1.104
492.5
–18
1.192
0
4.675
3.086
2.338
1.683
1.403
1.122
500
0
1.210
4.750
3.135
2.375
1.710
1.425
1.140
507.5
18
1.228
V
REF
±20
80
0.8
0.52
0.34
125
2
1.2
±15
0.8
±15
±15
±15
–2.6
30
4
I
V5
, I
V6
I
CRT(UP)
I
CRT(DN)
t
RST
t
UV
V
OL
V
OL
V
OH
I
CWT(UP)
I
CWT(DN)
t
WD
V
WDI
V5, V6 Input Current (LTC2939)
CRT Pull-Up Current
CRT Pull-Down Current
Reset Timeout Period
V
n
Undervoltage Detect to
RST
Voltage Output Low
RST
Voltage Output Low
WDO
Voltage Output High
RST, WDO
(Note 5)
CWT Pull-Up Current
CWT Pull-Down Current
Watchdog Timeout Period
WDI Input Threshold
(V
CC
= 3.3V to 5.5V)
–1.4
10
2
–2
20
3
150
0.15
0.05
0.15
0.4
0.3
0.4
V
V
V
V
V2 – 1
–1.4
10
20
0.7
1.4
–2
20
30
0.9
–2.6
30
40
0.4
1.1
μA
μA
ms
V
V
V
293839ff
3
LTC2938/LTC2939
ELECTRICAL CHARACTERISTICS
SYMBOL
I
WDI
PARAMETER
WDI Input Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 5V unless otherwise specified. (Note 3)
CONDITIONS
V
WDI
= GND
V
WDI
= 0.7V
V
WDI
= 1.1V
V
WDI
= 5V
V
CC
= 3.3V or 5.5V
l
l
l
l
l
MIN
–10
10
2
TYP
MAX
–30
30
UNITS
μA
μA
μA
μA
μs
t
WP
WDI Input Pulse Width
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 noted.
Note 3:
The greater of V1, V2 is the internal supply voltage (V
CC
).
Note 4:
Under static no-fault conditions, V1 will necessarily supply
quiescent current. If at any time V2 is larger than V1, V2 must be capable
of supplying the quiescent current, programming (transient) current and
reference load current.
Note 5:
The outputs
RST
and
WDO
have internal pull-ups to V2 of typically
6μA. However, external pull-up resistors may be used when faster rise
times are required or for V
OH
voltages greater than V2. For V2 configured
to monitor 1.2V, 1.5V, 1.8V and 2.5V supplies, external pull-up resistors
are required to ensure that the output voltage, high, is above the V
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Embedded System
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