LTC3586EUFE#PBF Linear Technology, LTC3586EUFE#PBF Datasheet - Page 16

IC MANAGER USB PWR HI-EFF 38QFN

LTC3586EUFE#PBF

Manufacturer Part Number
LTC3586EUFE#PBF
Description
IC MANAGER USB PWR HI-EFF 38QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LTC3586EUFE#PBF

Applications
Handheld/Mobile Devices
Voltage - Supply
4.35 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
38-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Supply
-

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LTC3586/LTC3586-1
Suspend LDO
If the LTC3586/LTC3586-1 are configured for USB suspend
mode, the switching regulator is disabled and the suspend
LDO provides power to the V
power available to V
tery from running down when the portable product has
access to a suspended USB port. Regulating at 4.6V, this
LDO only becomes active when the switching converter
is disabled (Suspended). To remain compliant with the
USB specification, the input to the LDO is current limited
so that it will not exceed the 500µA low power suspend
specification. If the load on V
current limit, the additional current will come from the
battery via the ideal diode.
3.3V Always-On Supply
The LTC3586/LTC3586-1 include a low quiescent current
low dropout regulator that is always powered. This LDO
can be used to provide power to a system pushbutton
controller, standby microcontroller or real-time clock. De-
signed to deliver up to 20mA, the always-on LDO requires
at least a 1µF low impedance ceramic bypass capacitor
for compensation. The LDO is powered from V
therefore will enter dropout at loads less than 20mA as
V
should be disabled by connecting it to V
operaTion

OR WALL
ADAPTER
OUT
TO USB
falls near 3.3V. If the LDO3V3 output is not used, it
4
I
h
SWITCH
V
35, 36
CLPROG
CLPROG
BUS
1.188V
/
BUS
AVERAGE INPUT
CURRENT LIMIT
CONTROLLER
). This LDO will prevent the bat-
+
OUT
GATE DRIVE
OUT
PWM AND
pin (presuming there is
exceeds the suspend
AVERAGE OUTPUT
VOLTAGE LIMIT
OUT
CONTROLLER
Figure 3. PowerPath Block Diagram
.
+
+
OUT
3.6V
, and
CONSTANT-CURRENT
CONSTANT-VOLTAGE
BATTERY CHARGER
0.3V
+ –
V
An internal undervoltage lockout circuit monitors V
keeps the PowerPath switching regulator off until V
rises above 4.30V and is about 200mV above the battery
voltage. Hysteresis on the UVLO turns off the regulator if
V
this happens, system power at V
the battery via the ideal diode.
Battery Charger
The LTC3586/LTC3586-1 include a constant-current/con-
stant-voltage battery charger with automatic recharge,
automatic termination by safety timer, low voltage trickle
charging, bad cell detection and thermistor sensor input
for out-of-temperature charge pausing.
Battery Preconditioning
When a battery charge cycle begins, the battery charger
first determines if the battery is deeply discharged. If the
battery voltage is below V
trickle charge feature sets the battery charge current to
10% of the programmed value. If the low voltage persists
for more than 1/2 hour, the battery charger automatically
terminates and indicates via the CHRG pin that the battery
was unresponsive.
BUS
BUS
drops below 4.00V or to within 50mV of BAT. When
Undervoltage Lockout (UVLO)
IDEAL
DIODE
15mV
+
+
GATE
V
TRKL
BAT
OUT
SW
37
34
31
32
, typically 2.85V, an automatic
3586 F03
OUT
will be drawn from
+
SINGLE CELL
Li-Ion
OPTIONAL
EXTERNAL
IDEAL DIODE
PMOS
3.5V TO
(BAT + 0.3V)
TO SYSTEM
LOAD
BUS
3586fb
and
BUS

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