MAX8934CETI+T Maxim Integrated Products, MAX8934CETI+T Datasheet - Page 21

• Manufacturer Part Number: MAX8934CETI+T
• Description: IC BATTERY CHARGER DUAL 28TQFN
• Manufacturer: Maxim Integrated Products
• Series: Smart Power Selector™r

Specifications of MAX8934CETI+T

• 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: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MAX9834D), so input voltages greater than 5.3V (4.35V
for the MAX8934B/MAX8934C/MAX8934E) can increase
power dissipation in the limiter. The MAX8934_ input
limiter power loss is (V
be as high as 5.3V for the MAX8934A or 4.35V for the
MAX8934B–MAX8934E. The input limiter power loss is
not less than 0.2I x I
turns off when any input exceeds 6.9V (typ).
The input and charger current limits are set as shown in
Tables 2a and 2b. It is often preferable to change the
input current limit as the input power source is changed.
The MAX8934_ facilitates this by allowing different input
current limits for DC and USB as shown in Tables 2a
and 2b.
When the input current limit is reached, the first action
taken by the MAX8934_ is to reduce the battery charge
current. This allows the regulator to stay in dropout, or
at 5.3V (MAX8934A), during heavy loads, thus reducing
power dissipation. If, after the charge current is reduced
to 0mA, the load at SYS still exceeds the input current
limit, SYS voltage begins to fall. When the SYS voltage
drops to BATT, the SYS-to-BATT switch turns on, using
battery power to support the system load during the load
peak. The MAX8934_ features flexible input connections
(at the DC and USB input pins) and current-limit settings
(set by PEN1, PEN2, PSET, and ISET) to accommodate
nearly any input power configuration. However, it is
expected that most systems use one of two external
power schemes: separate connections for USB and an
AC adapter, or a single connector that accepts either
Table 2a. Input Limiter Control Logic (MAX8934A/MAX8934B/MAX8934C/MAX8934E)
*Charge current cannot exceed the input current limit. Charge may be less than the maximum charge current if the total SYS load
exceeds the input current limit.
Dual-Input Linear Chargers, Smart Power Selector
USB input; DC
AC adapter at
USB power at
USB power at
unconnected
unconnected
DC and USB
SOURCE
DC input
DC input
POWER
with Advanced Battery Temperature Monitoring
______________________________________________________________________________________
DOK
DC and USB Connections and
H
H
H
H
L
L
L
L
DC2
DC
– V
. Also note that the MAX8934_
UOK
H
X
X
X
X
L
L
L
SYS
Current-Limit Options
) x I
PEN1
DC
Input Current Limit
H
X
X
X
X
L
L
L
, where V
PEN2
H
H
X
X
L
X
X
L
SYS
may
USUS
H
H
X
L
L
L
L
X
CURRENT LIMIT
USB or AC adapter output. Input and charger current
limit are controlled by PEN1, PEN2, R
as shown in Tables 2a and 2b.
When the AC adapter and USB have separate connec-
tors, the adapter output connects to DC and the USB
source connects to USB. PEN1 is permanently connected
high (to DC or V
while the USB current limit is set by PEN2 and USUS.
When a single common connector is used for both AC
adapter and USB sources, the DC input is used for
both input sources. The unused USB inputs should be
grounded when an AC adapter is connected at DC,
PEN1 should be pulled high to select the current limit
set by R
should be low to select 500mA, 100mA, or USB suspend
(further selected by PEN2 and USUS). PEN1 can be
pulled up by the AC adapter power to implement hard-
ware adapter/USB selection.
Driving USUS high when PEN1 is low turns off charging,
as well as the SYS output and reduces input current to
190FA to accommodate USB suspend mode.
DOK is an open-drain output that pulls low when the DC
input has valid power. UOK is an open-drain output that
pulls low when the USB input has valid power. A valid
input for DC or USB is between 4.1V and 6.6V. If a single
power-OK output is preferred, DOK and UOK can be
USB suspend
3000V/R
No DC input
DC INPUT
475mA
95mA
Separate Adapter and USB Connectors
PSET
PSET
Power Monitor Outputs (UOK, DOK)
. When a USB source is connected, PEN1
L
). The DC current limit is set by R
CURRENT LIMIT
USB input off;
USB suspend
No USB input
DC input has
USB INPUT
Single Common Connector
priority
475mA
95mA
for USB or Adapter
MAXIMUM CHARGE
PSET
USB Suspend
3000V/R
3000V/R
CURRENT*
475mA
95mA
, and R
0
0
0
ISET
ISET
PSET
ISET
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