參數(shù)資料
型號: LTC4090EDJC#TRPBR
廠商: LINEAR TECHNOLOGY CORP
元件分類: 電源管理
英文描述: 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO22
封裝: 6 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WXXX, DFN-22
文件頁數(shù): 1/28頁
文件大小: 392K
代理商: LTC4090EDJC#TRPBR
LTC4090
1
4090f
VBAT (V)
2.0
EFFICIENCY
(%)
70
80
90
4.0
4090 TA01b
60
50
65
75
85
55
45
40
2.5
3.0
3.5
4.5
HVIN = 8V
HVIN = 12V
HVIN = 24V
HVIN = 36V
FIGURE 12 SCHEMATIC
WITH RPROG = 52k
NO OUTPUT LOAD
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
USB Power Manager with
2A High Voltage Bat-Track
Buck Regulator
The LTC4090 is a USB power manager plus high voltage
Li-Ion/Polymer battery charger. This device controls the
total current used by the USB peripheral for operation and
battery charging. Battery charge current is automatically
reduced such that the sum of the load current and the
charge current does not exceed the programmed input
current limit. The LTC4090 also accommodates high volt-
age power supplies, such as 12V AC/DC wall adapters,
FireWire, or automotive power.
The LTC4090 provides a Bat-Track adaptive output that
tracks the battery voltage for high efciency charging from
the high voltage input. The charge current is programmable
and an end-of-charge status output (CHRG) indicates
full charge. Also featured are programmable total charge
time, an NTC thermistor input used to monitor battery
temperature while charging and automatic recharging of
the battery.
Seamless Transition Between Power Sources: Li-
Ion Battery, USB, and 6V to 38V Supply (60V Max)
2A Output High Voltage Buck Regulator with Bat-
TrackTM Adaptive Output Control
Internal 215mΩ Ideal Diode Plus Optional External
Ideal Diode Controller Provides Low Loss Power
Path When External Supply / USB Not Present
Load Dependent Charging from USB Input Guaran-
tees Current Compliance
Full Featured Li-Ion Battery Charger
1.5A Maximum Charge Current with Thermal Limiting
NTC Thermistor Input for Temperature Qualied
Charging
Tiny (3mm × 6mm × 0.75mm) 22-Pin DFN Package
HDD-Based Media Players
Personal Navigation Devices
Other USB-Based Handheld Products
Automotive Accessories
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Bat-Track is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
HVIN
BOOST
IN
SW
4.7
μF
22
μF
4.7
μF
1
μF
TIMER
CLPROG
LTC4090
GND
PROG
HVOUT
HVPR
OUT
BAT
0.1
μF
270pF
100k
2k
5V WALL
ADAPTER
USB
HIGH (6V-38V)
VOLTAGE INPUT
VC
25k
RT
40.2k
Li-Ion BATTERY
+
1k
LOAD
4090 TAO1
VOUT (TYP)
VBAT + 0.3V
5V
VBAT
AVAILABLE INPUT
HV INPUT
USB ONLY
BAT ONLY
6.8
μH
0.47
μF
LTC4090 High Voltage Battery
Charger Efciency
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