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LTC4088 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4088
Description  High Effi ciency Battery Charger/USB Power Manager
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4088 Datasheet(HTML) 10 Page - Linear Technology

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LTC4088
10
4088f
OPERATIO
Introduction
The LTC4088 includes a PowerPath controller, battery
charger, internal ideal diode, optional external ideal diode
controller, SUSPEND LDO and an always-on 3.3V LDO.
Designed specifically for USB applications, the PowerPath
controller incorporates a precision average input current
limited step-down switching regulator to make maximum
use of the allowable USB power. Because power is con-
served, the LTC4088 allows the load current on VOUT to
exceed the current drawn by the USB port without exceed-
ing 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.
To prevent battery drain when a device is connected to a
suspended USB port, an LDO from VBUS to VOUT provides
either low power or high power suspend current to the
application.
Finally, an “always on” LDO provides a regulated 3.3V from
VOUT. This LDO will be on at all times and can be used to
supply up to 25mA to a system microprocessor.
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,
+
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
SW
SYSTEM LOAD
3.5V TO
(BAT + 0.3V)
OPTIONAL
EXTERNAL
IDEAL DIODE
PMOS
SINGLE CELL
Li-Ion
4088 F01
12
BAT
9
VBUS
TO USB
OR WALL
ADAPTER
11
+
Figure 1


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