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ACT2861QI Datasheet(PDF) 47 Page - Active-Semi, Inc

Part # ACT2861QI
Description  30V Buck-Boost Charger with Integrated MOSFETs and OTG
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Manufacturer  ACTIVE-SEMI [Active-Semi, Inc]
Direct Link  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2861QI Datasheet(HTML) 47 Page - Active-Semi, Inc

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ACT2861QI
Rev 2.0, 27-Apr-2018
Innovative PowerTM
www.active-semi.com
ActiveSwitcherTM is a trademark of Active-Semi
Copyright © 2018 Active-Semi, Inc.
47
Table 9: OTG Inductor and Compensation
ICOMP
RICOMP1
CICOMP1
CICOMP2
Figure 16: OTG Compensation
CHARGE STATUS OUTPUT PIN (NCHG)
The ACT2861 indicates the Charging and OTG states
on the open drain nCHG pin. The nCHG pin typically
drives an LED, but can also be monitored by a micro-
processor GPIO. In Charge mode, the nCHG pin func-
tion is enabled by setting I2C bit DIS_nCHG_CHG in
register 0x00h = 0. Disable the function by setting it to
1. In OTG mode, the nCHG function is enabled by set-
ting the I2C bit EN_OTG_nCHG in register 0x0Fh = 1.
Disable the function by setting it to 0.
Tables 10 and 11 show the nCHG state in different
Charge and OTG operating conditions.
Table 10: nCHG Pin State in Charge Mode
Charging State
nCHG Output Pin
Charging in progress
LOW
Charging complete
HIZ
Charge suspend or Fault
Blinking at 1Hz
Table 11: nCHG Pin State in OTG Mode
OTG State
nCHG Output Pin
OTG Enabled and Output Valid
LOW
OTG Disabled
HIZ
OTG Enabled In Fault, Hiccup,
or Light Load states
HIZ
ADC Monitoring
General Description
The ACT2861 contains a built-in analog to digital con-
verter, ADC, which can be used to monitor seven sys-
tem level parameters. These include input voltage, out-
put voltage, input current, output current, TH pin, die
temperature, and the external ADC input pin. It uses a
single 12 bit delta-sigma ADC that uses an analog input
multiplexer to select one of seven channels for the A/D
conversion. The resulting digital results are stored in
seven digital registers. A seven to one multiplexer con-
nects one of the ADC output registers to the user ac-
cessible register map.
ADC Configuration
The ACT2861 ADC is configured through the I2C inter-
face. It is enabled and disabled by the I2C bit EN_ADC
in register 0x09h. The ADC has two conversion modes,
manual single-shot conversion and automatic polling
conversion.
Single-Shot Conversion
Configure the IC for single-shot conversion mode by
setting the following I2C bits in register 0x09h
Standard Capacitance Design
Minimum Capacitance Design
Switching
Frequency
Inductor
Min / Typ / Max
(uH)
CICOMP1
(nF)
CICOMP2
(nF)
RICOMP
(kΩ)
Ceramic
Capacitor
(uF)
Bulk
Capacitor
(uF)
Bulk
Capacitor
ESR
(mΩ)
Ceramic
Capacitor
(uF)
Bulk
Capacitor
(uF)
Bulk
Capacitor
ESR
(mΩ)
125Khz
29 / 42 / 55
82
8.2
20.0
47
1000
N/A
22
470
30 - 100
250Khz
15 / 22 / 29
39
3.9
20.0
47
470
N/A
22
220
50 - 200
500KHz
7 / 10 / 13
22
2.2
20.0
47
220
N/A
22
100
50 - 200
1MHZ
4 / 5.6 / 7.28
10
1.0
20.0
47
100
N/A
22
100
50 - 200


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