Manual

MAX847
1-Cell, Step-Up
Two-Way Pager System IC
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(OUT = 3.0V, BATT = 1.2V, NICD = 3.6V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
I
REG2
= 0 to 24mA, OUT = 3.0V, R
OFS
= 15kΩ
mV120 155 190REG2 Voltage Drop
OUT = 3.0V, I
REG1
= 65mA
f = 268.8kHz, C
REG1
= 10µF ceramic
CONDITIONS
f = 268.8kHz, C
REG1
= 10µF, ceramic,
R
OFS
= 15kΩ, C
OFS
= 0.1µF, I
REG2
= 15mA
dB30 40
REG2 Supply Rejection
(Note 15)
f = 268.8kHz, C
REG1
= 1µF ceramic dB40 50REG3 Supply Rejection (Note 15)
nA-50 -3 50LBI/RSIN Input Current
I
OUT
= 1mA mV30 400LBO/RSO Output Low
Output = 5.5V nA1 250LBO/RSO Output Leakage
Ω
1.5 3.1REG1 PMOS On-Resistance
dB15 25REG1 Supply Rejection (Note 15)
UNITSMIN TYP MAXPARAMETER
10mV overdrive µs15 50
LBO/RSO Response Time
(Note 15)
V0.2 1.27CH0 Threshold Range (Note 15)
Measures NICD V1.2 5.08CH1 Threshold Range (Note 15)
Measures BATT V0.2 1.27CH2 Threshold Range (Note 15)
mV10
CH0 Threshold Resolution
(Note 15)
Measures NICD mV40
CH1 Threshold Resolution
(Note 15)
Measures BATT mV10
CH2 Threshold Resolution
(Note 15)
mV7.5 16 30
LBI/RSIN Input Hysteresis
(Note 15)
I
REG2
= 0.1mA to 24mA mV9REG2 Load Regulation
REG3 Output Voltage I
REG3
= 0 to 2mA 0.96 1.0 1.04 V
Falling input V0.58 0.60 0.63LBI/RSIN Input Threshold
At thresholds of 200mV, 800mV, and 1270mV %
-2.0 2.0
-15mV +15mV
CH0 Error
At thresholds of 1200mV, 3200mV, and 5080mV %
-3.0 3.0
-60mV +60mV
CH1 Error
3.2 3.3 3.4
I
OUT
= 1mA, OUT = 4.9V V
3.15 3.45
REG1 Clamp Voltage
T
A
= +25°C
T
A
= -40°C to +85°C
At thresholds of 200mV, 800mV, and 1270mV %
-2.0 2.0
-15mV +15mV
CH2 Error
mV1 2 4CH0 Input Hysteresis (Note 15)
LINEAR REGULATORS
DATA-ACQUISITION AND VOLTAGE MONITORS
mV4 8 16CH1 Input Hysteresis (Note 15)