MAX8725ETI Maxim Integrated Products, MAX8725ETI Datasheet - Page 13

• Manufacturer Part Number: MAX8725ETI
• Description: Battery Management Multichemistry Battery Charger
• Manufacturer: Maxim Integrated Products

Specifications of MAX8725ETI

• Product: Charge Management
• Battery Type: Li-Ion, Li-Polymer, NiCd, NiMH, Lead Acid, Universal
• Operating Supply Voltage: 8 V to 28 V
• Supply Current: 2.7 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: TQFN-28
• Charge Safety Timers: No
• Mounting Style: SMD/SMT
• Temperature Monitoring: No
• Uvlo Start Threshold: 9.18 V
• Uvlo Stop Threshold: 9.42 V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Multichemistry Battery Chargers with Automatic
PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
NAME
ACOK
PGND
MODE
DLOV
CSSN
DCIN
BATT
CSSP
ACIN
VCTL
CSIN
DHIV
GND
GND
CSIP
LDO
ICTL
CCV
CCS
DLO
IINP
CLS
SRC
PDS
REF
PDL
CCI
DHI
______________________________________________________________________________________
DC Supply Voltage Input. Bypass DCIN with a 1μF capacitor to power ground.
Device Power Supply. Output of the 5.4V linear regulator supplied from DCIN. Bypass with a 1μF capacitor.
AC Detect Input. This uncommitted comparator input can be used to detect the presence of the charger’s
power source. The comparator’s open-drain output is the ACOK signal.
4.2235V Voltage Reference. Bypass with a 1μF capacitor to GND.
MAX1909: Ground this pin.
MAX8725: Pull
AC Detect Output. High-voltage open-drain output is high impedance when ACIN is greater than 2.048V.
The ACOK output remains a high impedance when the MAX1909/MAX8725 are powered down.
Trilevel Input for Setting Number of Cells and Asserting the Conditioning Mode:
MODE = GND; asserts conditioning mode.
MODE = float; charge with 3 times the cell voltage programmed at VCTL.
MODE = LDO; charge with 4 times the cell voltage programmed at VCTL.
Input Current Monitor Output. The current delivered at the IINP output is a scaled-down replica of the
system load current plus the input-referred charge current sensed across CSSP and CSSN inputs. The
transconductance of (CSSP - CSSN) to IINP is 3mA/V.
Source Current-Limit Input. Voltage input for setting the current limit of the input source.
Input for Setting Maximum Output Current
Input for Setting Maximum Output Voltage
Output Current-Regulation Loop-Compensation Point. Connect 0.01μF to GND.
Voltage-Regulation Loop-Compensation Point. Connect 10k
Input Current-Regulation Loop-Compensation Point. Use 0.01μF to GND.
Analog Ground
Battery Voltage Feedback Input
Output Current-Sense Negative Input
Output Current-Sense Positive Input. Connect a current-sense resistor from CSIP to CSIN.
Power Ground
Low-Side Power-MOSFET Driver Output. Connect to low-side NMOS gate. When the MAX1909/MAX8725 are
shut down, the DLO output is low.
Low-Side Driver Supply. Bypass with a 1μF capacitor to ground.
High-Side Driver Supply. Bypass with a 0.1μF capacitor to SRC.
High-Side Power-MOSFET Driver Output. Connect to high-side PMOS gate. When the MAX1909/MAX8725
are shut down, the DHI output is high.
Source Connection for Driver for PDS/PDL Switches. Bypass SRC to power ground with a 1μF capacitor.
Input Current Sense for Charger (Negative Input)
Input Current Sense for Charger (Positive Input). Connect a current-sense resistor from CSSP to CSSN.
Power-Source PMOS Switch Driver Output. When the MAX1909/MAX8725 are powered down, the PDS output
is pulled to SRC through an internal 1M
System-Load PMOS Switch Driver Output. When the MAX1909/MAX8725 are powered down, the PDL output
is pulled to ground through an internal 100k
high to disable charging. Used for detecting presence of battery pack.
resistor.
resistor.
System Power Selector
FUNCTION
in series with 0.1μF to GND.
Pin Description
13