Datasheet

3
LTC2902
2902f
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted. (Note 3)
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: All voltage values are with respect to GND.
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 output pins RST and COMPX 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.
Note 6: The push-pull RST output pin on the LTC2902-2 is
actively pulled up
to V2.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
RTAN
–ADJ Reset Threshold V4 Input Threshold ● –18 0 18 mV
V
CC
Minimum Internal Operating Voltage RST, COMPX in Correct Logic State; ● 1V
V
CC
Rising Prior to Program
V
CCMINP
Minimum Required for Programming V
CC
Rising ● 2.42 V
V
CCMINC
Minimum Required for Comparators V
CC
Falling ● 2.32 V
V
REF
Reference Voltage V
CC
≥ 2.3V, I
VREF
= ±1mA, C
REF
≤ 1000pF
T0 Low, T1 Low ● 1.192 1.210 1.228 V
T0 Low, T1 High
● 1.160 1.178 1.195 V
T0 High, T1 Low ● 1.128 1.146 1.163 V
T0 High, T1 High
● 1.096 1.113 1.130 V
V
PG
Programming Voltage Range V
CC
≥ V
CCMINP
● 0V
REF
V
I
VPG
V
PG
Input Current V
PG
= V
REF
● ±20 nA
I
V1
V1 Input Current V1 = 5V, I
VREF
= 12µA, (Note 4) ● 43 75 µA
I
V2
V2 Input Current V2 = 3.3V ● 0.8 2 µA
I
V3
V3 Input Current V3 = 2.5V ● 0.52 1.2 µA
V3 = 0.55V (ADJ Mode) –15 15 nA
I
V4
V4 Input Current V4 = 1.8V ● 0.34 0.8 µA
V4 = 0.55V (ADJ Mode)
● –15 15 nA
V4 = –0.05V (–ADJ Mode) ● –15 15 nA
I
CRT(UP)
CRT Pull-Up Current V
CRT
= 0V ● –1.4 –2 –2.6 µA
I
CRT(DN)
CRT Pull-Down Current V
CRT
= 1.3V ● 10 20 30 µA
t
RST
Reset Time-Out Period C
RT
= 1500pF ● 579 ms
t
UV
V
X
Undervoltage Detect to RST or COMPX V
X
Less Than Reset Threshold V
RTX
150 µs
by More Than 1%
V
OL
Output Voltage Low RST, COMPX I
SINK
= 2.5mA; V1 = 3V, V2 = 3V; ● 0.15 0.4 V
V3, V4 = 0V; V
PG
= 0V
I
SINK
= 100µA; V2 = 1V; V1, V3, V4 = 0V ● 0.05 0.3 V
I
SINK
= 100µA; V1 = 1V; V2, V3, V4 = 0V ● 0.05 0.3 V
V
OH
Output Voltage High RST, COMPX (Note 5) I
SOURCE
= 1µA ● V2 – 1 V
V
OH
Output Voltage High RST (LTC2902-2) I
SOURCE
= 200µA ● 0.8 • V2 V
(Note 6)
Digital Inputs T0, T1, RDIS
V
IL
T0, T1 Low Level Input Voltage V
CC
= 3.3V to 5.5V ● 0.3V
CC
V
V
IH
T0, T1 High Level Input Voltage V
CC
= 3.3V to 5.5V ● 0.7V
CC
V
I
INTOL
T0, T1 Input Current T0 = 0V, T1 = V
CC
● ±0.1 ±1 µA
V
IL
RDIS Input Threshold Low V
CC
= 3.3V to 5.5V ● 0.4 V
V
IH
RDIS Input Threshold High V
CC
= 3.3V to 5.5V ● 1.6 V
I
RDIS
RDIS Pull-Up Current V
RDIS
= 0V –10 µA