MAX8671XETL+ Maxim Integrated Products, MAX8671XETL+ Datasheet - Page 38

• Manufacturer Part Number: MAX8671XETL+
• Description: IC PMIC W/CHARGER 40-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8671XETL+

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.1 V ~ 6.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Mounting Style: SMD/SMT
• Input Voltage: 2.6 V to 6.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Current: 0.5 A
• Output Voltage: 0.6 V to 5 V
• Supply Current: 0.285 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Each MAX8671X regulator (REG1–REG5) has an inter-
nal 1kΩ resistor that discharges the output capacitor
when the regulator is off. The discharge resistors
ensure that the load circuitry powers down completely.
The internal discharge resistors are connected when a
regulator is disabled and when the device is in UVLO
with an input voltage greater than 1.0V. With an input
voltage less than 1.0V, the internal discharge resistors
are not activated.
Undervoltage lockout (UVLO) prevents an input supply
from being used when its voltage is below the operat-
Figure 13. REG5 Disable Detail
38
______________________________________________________________________________________
Undervoltage and Overvoltage Lockout
Active Discharge in Shutdown
V
V
USB
UOK
V5
IF V
IF V
THAN V
BAT
BAT
5V
UNPLUGGING USB WITH NOTHING TO DISCHARGE C
UNPLUG
EVENT
3.5V
≥ 3.4V, V
≤ 3.4V, V
BAT
USB/DC UVLO
(DROPOUT)
PV5
PV5
WILL REGULATE TO 3.3V
WILL BE SLIGHTLY LESS
HIGH-Z
ing range. When the USB voltage is less than the USB
UVLO threshold (4.0V typ), the USB input is discon-
nected from SYS, and UOK goes high impedance.
When the DC voltage is less than the DC UVLO thresh-
old (4.0V typ), the DC input is disconnected from SYS,
and DOK goes high impedance. In addition, when both
USB and DC are in UVLO, the battery charger is dis-
abled, and BAT is connected to SYS through the inter-
nal system load switch. REG1–REG4 are allowed to
operate from the battery without power at USB or DC.
REG5 is intended to power the system USB transceiver
circuitry, which is only active when USB power is avail-
able. Therefore, a valid source must be present on
either the USB or DC input for REG5 to enable.
t
DDREG5
USB
=
120μs (typ)
(V
RAPID DISCHARGE UNTIL V
TO THE HIGHER OF 3.5V OR V
SLOW DISCHARGE AS THE MAX8671X
DRAWS USB QUIESCENT CURRENT
BAT
= 3.3V). V5 SET FOR 3.3V
USB
BAT
DECAYS
+ 5OmV