MAX8568A 查看數據表（PDF） - Maxim Integrated
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MAX8568A Datasheet PDF : 17 Pages
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Complete Backup-Management ICs
for Lithium and NiMH Batteries
Typical Operating Characteristics (continued)
(Circuit of Figure 7, VIN = 3.6V, VBK = 1.4V, VNI/LI = VBKSU = 3.3V, TA = +25°C, unless otherwise noted.)
MAIN-TO-BK TRANSITION WAVEFORMS
MAX8658 toc13
VINOK
3V
IBKSU
2V
VLX
MAX8568 PROVIDES 3.3V
MAX1586 PROVIDES 3.3V
VBKSU
2V/div
0
50mV/div
VBKSU
AC-COUPLED
SWITCHOVER POINT
200µs/div
C3 = 22µF
LOAD = 10mA
BKSU LOAD TRANSIENT
MAX8568 toc14
VBKSU vs. LDO LOAD CURRENT
3.32
10mA/div
3.31
0
3.30
IBKSU = 20mA
3.29
20mV/div
AC-COUPLED
3.28
IBKSU = 40mA
200µs/div
C3 = 22µF
3.27
3.26
0.1
1
10
100
LDO LOAD CURRENT (mA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
LDO OUTPUT VOLTAGE
vs. BK INPUT VOLTAGE
1
2
3
4
BK INPUT VOLTAGE (V)
VINOK
VLX
VOD2
VOD1
LDO LOAD TRANSIENT
MAX8568 toc17
BKSU RESPONSE TO
LDO LOAD TRANSIENT
MAX8568 toc18
ILDO
10mA/div
ILDO
0
10mA/div
0
VLDO
5
400µs/div
20mV/div
VBKSU
AC-COUPLED
IBKSU = 0mA
200µs/div
20mV/div
AC-COUPLED
C3 = 22µF
VINOK FALLING
MAX8568 toc19
1V/div
2V
5V/div
0
200µs/idv
1V/div
0
2V/div
0
VINOK
VLX
VOD2
VOD1
VINOK RISING
MAX8568 TOC20
2V/div
0V
5V/div
0
1V/div
0
2V/div
0
4ms/div
_______________________________________________________________________________________ 7
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