Manual

MAX847
1-Cell, Step-Up
Two-Way Pager System IC
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
0
20
60
40
80
100
0.5 1 1.5 2
NO-LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE
MAX847-toc04
BATTERY VOLTAGE (V)
BATTERY CURRENT (mA)
V
OUT
= 3.0V
COAST MODE
0
100
50
200
150
250
300
0 10.5 1.5 2 2.5
MAXIMUM LOAD CURRENT vs.
BATTERY VOLTAGE
MAX847-TOC05
BATTERY VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
RUN MODE
COAST MODE
(V
OUT
= 3.0V)
1 10 100
START-UP INPUT VOLTAGE
vs. LOAD CURRENT
MAX847-TOC06
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
0
0.6
0.4
0.2
0.8
1.0
1.2
1.4
1.6
1.8
2.0
V
OUT
= 3.0V
COAST MODE
0
5
15
10
20
25
0 21 3 4 5 6
NICD CHARGING CURRENT vs.
NICD VOLTAGE
MAX847-TOC7
OUTPUT VOLTAGE (V)
NICD CHARGING CURRENT (mA)
15mA MODE
V
OUT
= 4.9V
20
-80
100 200 300 400 500 600
LX NOISE SPECTRUM
(RUN MODE, SYNC OPERATION)
-60
MAX847-09
FREQUENCY (kHz)
NOISE (dBV)
-40
-20
0
0
2
1
3
0 21 3 4 5
DR1 OR DR2 ON-RESISTANCE vs. V
OUT
MAX847-toc08
V
OUT
VOLTAGE (V)
R
ON
(Ω)
100
0
0.1 1 10 100 1000 10,000
REG2 NOISE SPECTRUM
(RUN MODE)
20
MAX847TOC-10
FREQUENCY (kHz)
NOISE (dBµV)
40
60
80