MAX17006BETP+ Maxim Integrated Products, MAX17006BETP+ Datasheet - Page 14

• Manufacturer Part Number: MAX17006BETP+
• Description: IC BATT CHARGER 1.2MHZ 20-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX17006BETP+

• Function: Charge Management
• Battery Type: Multi-Chemistry
• Voltage - Supply: 8 V ~ 26 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1.2MHz Low-Cost,
High-Performance Chargers
IINP can also be used to monitor battery discharge cur-
rent (see Figure 5). In the MAX17015, when the adapter is
absent, drive ISET above 1V to enable IINP during battery
discharge. When the adapter is reinserted, ISET must be
released to the correct control level within 300ms.
The MAX17005/MAX17006/MAX17015 include a hys-
teretic comparator that detects the presence of an AC
power adapter. When ACIN is lower than 2.1V, the
open-drain ACOK output becomes high impedance.
Connect a 10kΩ pullup resistance between LDO and
ACOK. Use a resistive voltage-divider from the
adapter’s output to the ACIN pin to set the appropriate
detection threshold. Select the resistive voltage-divider
so that the voltage on ACIN does not to exceed its
absolute maximum rating (6V).
An integrated low-dropout (LDO) linear regulator pro-
vides a 5.4V supply derived from DCIN, and delivers
over 40mA of load current. Do not use the LDO to
external loads greater than 10mA. The LDO powers the
gate drivers of the n-channel MOSFETs. See the
MOSFET Drivers section. Bypass LDO to PGND with a
4.7μF ceramic capacitor. V
plied by DCIN. V
and should be bypassed to GND with a 1μF or greater
ceramic capacitor.
Figure 5. Current-Monitoring Design Battery Discharge
14
Q1a
______________________________________________________________________________________
C7
10nF
MAX17015
CSSP
15mΩ
RS1
AA
biases most of the control circuitry,
CSSN
BST
DHI
LX
C
LDO Regulator and V
IN
AC Adapter Detection
AA
D1
C4
0.1μF
is 4.2V reference sup-
SYSTEM LOAD
50kΩ
ADAPTER
N1
R6
Q1b
BATTERY
AA
The MAX17005/MAX17006/MAX17015 have the following
operating states:
•
•
The MAX17005/MAX17006/MAX17015 allow charging
under the following conditions:
•
•
•
____________________DC-DC Converter
The MAX17005/MAX17006/MAX17015 employ a syn-
chronous step-down DC-DC converter with an n-chan-
nel high-side MOSFET switch and an n-channel
low-side synchronous rectifier. The charger features a
controlled inductor current-ripple architecture, current-
mode control scheme with cycle-by-cycle current limit.
The controller’s off-time (t
high-side MOSFET junction temperature constant. In
this way, the controller switches faster when the high-
side MOSFET has available thermal capacity. This
allows the inductor current ripple and the output-volt-
age ripple to decrease so that smaller and cheaper
components can be used. The controller can also oper-
ate in discontinuous conduction mode for improved
light-load efficiency.
Adapter Present: When DCIN is greater than 8.7V,
the controller detects the adapter. In this condition,
both the LDO and V
is allowed:
a) Charging: The total MAX17005/MAX17006/
b) Not Charging: To disable charging drive ISET
Adapter Absent (Power Fail): When V
than V
dropout. The charger detects the dropout condition
and shuts down.
DCIN > 7.5V, LDO > 4V, V
V
V
DCIN
ISET
MAX17015 quiescent current when charging is
3mA (max) plus the current required to drive the
MOSFETs.
below 26mV. When the adapter is present and
charging is disabled, the total adapter quiescent
current is less than 1.5mA and the total battery
quiescent current is less than 60μA. The charge
pump still operates.
> 45mV or PWM detected
> V
CSIN
CSIN
+ 120mV, the DC-DC converter is in
+ 420mV (300mV falling hysteresis)
AA
OFF
turn on and battery charging
Operating Conditions
) is adjusted to keep the
AA
> 3.1V
DCIN
is less