MAX17085BETL+ Maxim Integrated Products, MAX17085BETL+ Datasheet - Page 17

• Manufacturer Part Number: MAX17085BETL+
• Description: Battery Management Dual Main Step-Down Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX17085BETL+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIN
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Integrated Charger, Dual Main Step-Down
CELLS
NAME
ACOK
CSSN
BATT
PDSL
CSSP
VCTL
ILIM3
ILIM5
CSIN
ACIN
CSIP
GND
ISET
IINP
V
REF
______________________________________________________________________________________
CC
CC
Controllers, and Dual LDO Regulators
AC-Detect Output. This open-drain output is low impedance when ACIN is greater than 1.5V, with a
delay of 44ms. The ACOK output remains high impedance when the MAX17085B is powered down.
Connect a 100kI pullup resistor from LDO3 or LDO5 to ACOK.
Output Current-Sense Negative Input
Output Current-Sense Positive Input. Connect a current-sense resistor from CSIP to CSIN.
Battery Voltage Feedback Input
Power Source Switch Driver Output. When the adapter is not present or an overvoltage and
overcurrent event is detected, the PDSL output is pulled to GND. Leave PDSL unconnected when it
is not used.
Input Current-Sense Negative Input
Input Current Sense for Positive Input. Connect a current-sense resistor from CSSP to CSSN.
Input Current Monitor Output. IINP sources the current proportional to the current sensed across
CSSP and CSSN. The gain from (CSSP - CSSN) to IINP is 60V/V:
IINP also monitors the battery-discharge current when the adapter is absent. To monitor the
discharge current, set ISET above the PWM threshold. Pull ISET to GND to disable the IINP battery-
discharge current mode.
Trilevel Input for Setting Number of Cells:
U CELLS = open; charge with 2 times the cell voltage programmed at VCTL.
U CELLS = GND; charge with 3 times the cell voltage programmed at VCTL.
U CELLS > 2.8V; charge with 4 times the cell voltage programmed at VCTL.
Charger Loop-Compensation Point. External compensation node for the charge voltage and input
current-limit loops. Connect a 4.7nF to 47nF capacitor to GND. Typically a 10nF capacitor works for
most applications.
AC Adapter Detect Input. ACIN is the input to an uncommitted comparator. The ACOK detect
threshold is typically 1.5V. The ACOVP detect threshold is typically 2.1V. When ACIN is above the
ACOK detect threshold and below the ACOVP detect threshold, PDSL is enabled.
Cell Charge Voltage-Control Input. VCTL range is from GND to LDO5. For 4.375V/cell setting,
connect VCTL to REF:
Analog Supply Voltage Input. Connect V
and bypass to analog ground using a 1FF or greater ceramic capacitor.
Dual-Mode Input for Setting Maximum Charge Current. In PWM mode, use input frequencies from
128Hz to 500kHz for charge-current setting. If there are no two edges within 20ms, ISET is directly
used as an analog input. In analog mode, charge current is set as follows:
Pull ISET to GND to shut down the charger.
2.1V Voltage Reference and Device Power-Supply Input. Bypass REF with a 1FF capacitor to GND.
Analog Ground
Valley Current-Limit Adjustment for SMPS3. The GND - LX3 current-limit threshold is 1/10 the voltage
present on ILIM3 over a 0.2V to 2.1V range.
Valley Current-Limit Adjustment for SMPS5. The GND - LX5 current-limit threshold is 1/10 the voltage
present on ILIM5 over a 0.2V to 2.1V range.
V
IINP
I
CHG
V
CC
CELL
= 60 x (V
to the system supply voltage with a series 47I resistor,
=
FUNCTION
= 2.083 x V
100mV
RS2
CSSP
Pin Description (continued)
×
- V
V
V
VCTL
ISET
REF
CSSN
)
17