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LTC4088-2 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4088-2
Description  High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4088-2 Datasheet(HTML) 10 Page - Linear Technology

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LTC4088-1/LTC4088-2
10
40881fb
OPERATIO
Introduction
The LTC4088-1/LTC4088-2 includes a PowerPath controller,
battery charger, internal ideal diode, external ideal diode
controller and a SUSPEND LDO. Designed specifically for
USB applications, the PowerPath controller incorporates a
precision average input current limited step-down switch-
ing regulator to make maximum use of the allowable USB
power. Because power is conserved, the LTC4088-1/
LTC4088-2 allows the load current on VOUT to exceed the
current drawn by the USB port without exceeding the USB
load specifications.
The switching regulator and battery charger communicate
to ensure that the average input current never exceeds the
USB specifications.
The ideal diodes from BAT to VOUT guarantee that ample
power is always available to VOUT even if there is insuf-
ficient or absent power at VBUS.
Finally, to prevent battery drain when a device is con-
nected to a suspended USB port, an LDO from VBUS to
VOUT provides either low power or high power suspend
current to the application.
Input Current Limited Step Down Switching Regulator
The power delivered from VBUS to VOUT is controlled
by a 2.25MHz constant frequency step-down switching
regulator. To meet the USB maximum load specification,
the switching regulator contains a measurement and
control system that ensures that the average input cur-
rent remains below the level programmed at CLPROG.
VOUT drives the combination of the external load and the
battery charger.
If the combined load does not cause the switching power
supply to reach the programmed input current limit, VOUT
will track approximately 0.3V above the battery voltage.
By keeping the voltage across the battery charger at this
low level, power lost to the battery charger is minimized.
Figure 1 shows the power path components.
If the combined external load plus battery charge current is
large enough to cause the switching power supply to reach
the programmed input current limit, the battery charger
will reduce its charge current by precisely the amount
necessary to enable the external load to be satisfied. Even
if the battery charge current is programmed to exceed the
allowable USB current, the USB specification for average
input current will not be violated; the battery charger will
reduce its current as needed. Furthermore, if the load cur-
rent at VOUT exceeds the programmed power from VBUS,
load current will be drawn from the battery via the ideal
diodes even when the battery charger is enabled.
The current at CLPROG is a precise fraction of the VBUS
current. When a programming resistor and an averaging
+
0.3V
1.188V
3.6V
CLPROG
ISWITCH/N
+ –
15mV
OV
IDEAL
DIODE
PWM AND
GATE DRIVE
AVERAGE INPUT
CURRENT LIMIT
CONTROLLER
AVERAGE OUTPUT
VOLTAGE LIMIT
CONTROLLER
CONSTANT CURRENT
CONSTANT VOLTAGE
BATTERY CHARGER
2
GATE
8
VOUT
10
VOUTS
3
SW
SYSTEM LOAD
3.5V TO
(BAT + 0.3V)
EXTERNAL
IDEAL DIODE
PMOS
SINGLE CELL
Li-Ion
408812 F01
12
BAT
9
VBUS
TO USB
OR WALL
ADAPTER
11
+
Figure 1


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