MAX8568B Maxim Integrated Products, MAX8568B Datasheet - Page 7

• Manufacturer Part Number: MAX8568B
• Description: (MAX8568A/B) Complete Backup-Management ICs
• Manufacturer: Maxim Integrated Products

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V
V
BKSU
INOK
V
LX
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
MAIN-TO-BK TRANSITION WAVEFORMS
0
MAX1586 PROVIDES 3.3V
SWITCHOVER POINT
0
(Circuit of Figure 7, V
1
vs. BK INPUT VOLTAGE
LDO OUTPUT VOLTAGE
MAX8568 PROVIDES 3.3V
BK INPUT VOLTAGE (V)
200µs/div
2
V
V
V
INOK
V
OD2
OD1
3
LX
C3 = 22µF
LOAD = 10mA
_______________________________________________________________________________________
IN
MAX8658 toc13
= 3.6V, V
4
3V
2V
2V/div
0
50mV/div
AC-COUPLED
V
5
BK
INOK
200µs/idv
Complete Backup-Management ICs
= 1.4V, V
FALLING
V
I
V
BKSU
BKSU
I
LDO
LDO
NI/LI
for Lithium and NiMH Batteries
MAX8568 toc19
Typical Operating Characteristics (continued)
= V
BKSU
BKSU LOAD TRANSIENT
LDO LOAD TRANSIENT
1V/div
2V
5V/div
0
1V/div
0
2V/div
0
= 3.3V, T
400µs/div
200µs/div
A
= +25°C, unless otherwise noted.)
V
C3 = 22µF
V
V
INOK
MAX8568 toc17
V
OD2
OD1
MAX8568 toc14
LX
10mA/div
0
20mV/div
AC-COUPLED
10mA/div
0
20mV/div
AC-COUPLED
V
INOK
4ms/div
V
RISING
BKSU
3.32
3.31
3.30
3.29
3.28
3.27
3.26
I
LDO
0.1
I
BKSU = 0mA
V
MAX8568 TOC20
BKSU
I
BKSU
I
BKSU
LDO LOAD TRANSIENT
BKSU RESPONSE TO
LDO LOAD CURRENT (mA)
vs. LDO LOAD CURRENT
= 20mA
= 40mA
1
2V/div
0V
5V/div
0
1V/div
0
2V/div
0
200µs/div
10
C3 = 22µF
MAX8568 toc18
100
7
10mA/div
20mV/div
AC-COUPLED
0
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