BQ25700A Datasheet, PDF (17/82 Pages) Texas Instruments – SMBus Multi-Chemistry Battery Buck-Boost Charge Controller With System Power Monitor and Processor Hot Monitor

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bq25700A
SLUSCQ8 – MAY 2017
Timing Requirements (continued)
t_SU(DAT)
Data setup time
t_H(DTA)
Data hold time
t_SU(STOP)
Setup time for STOP condition
t_(BUF)
Bus free time between START and STOP condition
F_S(CL)
Clock Frequency
HOST COMMUNICATION FAILURE
t_timeout
SMBus bus release timeout⁽¹⁾
t_BOOT
Deglitch for watchdog reset signal
Watchdog timeout period, ChargeOption() bit [14:13] = 01⁽²⁾
t_WDI
Watchdog timeout period, ChargeOption() bit bit [14:13] = 10⁽²⁾
Watchdog timeout period, ChargeOption() bit bit [14:13] = 11⁽²⁾ (default)
MIN TYP MAX UNIT
250
ns
300
ns
4
µs
4.7
µs
10
100 KHz
25
35 ms
10
ms
35 44 53 s
70 88 105 s
140 175 210 s
(1) Devices participating in a transfer will timeout when any clock low exceeds the 25ms minimum timeout period. Devices that have
detected a timeout condition must reset the communication no later than the 35 ms maximum timeout period. Both a master and a slave
must adhere to the maximum value specified as it incorporates the cumulative stretch limit for both a master (10 ms) and a slave (25
ms).
(2) User can adjust threshold via SMBus ChargeOption() REG0x12.
7.7 Typical Characteristics
90
85
80
75
70
65
60
0
0.01
VIN = 5 V
0.02
0.03
Output Current (A)
VOUT = 6.1 V
VOUT = 8.4 V
VOUT = 9.2 V
VOUT = 12.5 V
0.04
0.05
D001
Figure 1. Light Load Efficiency
90
85
80
75
70
65
60
0
0.01
VIN = 20 V
0.02
0.03
Output Current (A)
VOUT = 6.1 V
VOUT = 8.4 V
VOUT = 9.2 V
VOUT = 12.5 V
0.04
0.05
D001
Figure 3. Light Load Efficiency
90
85
80
75
70
65
60
0
0.01
VIN = 12 V
0.02
0.03
Output Current (A)
VOUT = 6.1 V
VOUT = 8.4 V
VOUT = 9.2 V
VOUT = 12.5 V
0.04
0.05
D001
Figure 2. Light Load Efficiency
96
94
92
90
88
86
84
82
80
0
1
VIN = 5 V
VOUT = 3.7 V
VOUT = 7.4 V
VOUT = 11.1 V
VOUT = 14.8 V
2
3
4
5
6
Output Current (A)
D001
Figure 4. System Efficiency
Copyright © 2017, Texas Instruments Incorporated
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