Datasheet

MAX769
2 or 3-Cell, Step-Up/Down,
Two-Way Pager System IC
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
100
10
1 4 532 6
NO-LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX769-04
BATTERY VOLTAGE (V)
BATTERY CURRENT (µA)
V
OUT
= 3.0V
COAST MODE
160
140
120
100
80
60
40
20
0
1 4 532 6
MAXIMUM LOAD CURRENT
vs. BATTERY VOLTAGE
MAX769-05
BATTERY VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
RUN MODE
COAST MODE
V
OUT
= 3.0V
6
1
1 10 100
START-UP BATTERY VOLTAGE
vs. LOAD CURRENT
2
MAX769-06
LOAD CURRENT (mA)
START-UP BATTERY VOLTAGE (V)
3
4
5
V
OUT
= 3.0V
COAST MODE
0
5
15
10
20
25
0 21 3 4 5 6
NICD CHARGING CURRENT vs.
NICD VOLTAGE
MAX769-07
NICD VOLTAGE (V)
NICD CHARGING CURRENT (mA)
15mA MODE
V
OUT
= 4.9V
0
2
1
3
0 21 3 4 5
DR1 OR DR2 ON-RESISTANCE vs. V
OUT
MAX769-08
V
OUT
VOLTAGE (V)
R
ON
(Ω)
-80
-60
-40
0
-20
20
100 300200 400 500 600
LX NOISE SPECTRUM
(RUN MODE, SYNC OPERATION)
MAX769-09
FREQUENCY (kHz)
NOISE (dBV)
0
20
60
80
40
100
0.1 101 100 1000 10,000
REG2 NOISE SPECTRUM
(RUN MODE)
MAX769-10
FREQUENCY (kHz)
NOISE (dBµV)