900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3557EUF Datasheet

USB Power Manager

No Preview Available !

LTC3557/LTC3557-1
USB Power Manager with
Li-Ion Charger and Three
Step-Down Regulators
FEATURES
Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB, 5V Wall Adapter or High
Voltage Buck Regulator with Bat-TrackTM
200mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provides Low Loss Power
Path When Input Current is Limited or Unavailable
Triple Adjustable High Efficiency Step-Down
Switching Regulators (600mA, 400mA, 400mA IOUT)
Pin Selectable Burst Mode® Operation
Full Featured Li-Ion/Polymer Battery Charger
1.5A Maximum Charge Current with Thermal Limiting
Battery Float Voltage:
4.2V (LTC3557)
4.1V (LTC3557-1)
Low Profile 4mm × 4mm 28-Pin QFN Package
APPLICATIONS
HDD-Based MP3 Players
PDA, PMP, PND/GPS
USB-Based Handheld Products
DESCRIPTION
The LTC®3557/LTC3557-1 is a highly integrated power
management and battery charger IC for single cell Li-Ion/
Polymer battery applications. It includes a PowerPathTM
manager with automatic load prioritization, a battery
charger, an ideal diode and numerous internal protection
features. Designed specifically for USB applications, the
LTC3557/LTC3557-1 power manager automatically limits
input current to a maximum of either 100mA or 500mA
for USB applications or 1A for wall adapter powered
applications. 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 LTC3557/LTC3557-1 also includes three
adjustable synchronous step-down switching regulators
and a high voltage buck regulator output controller with
Bat-Track that allows efficient charging from supplies as
high as 38V. The LTC3557/LTC3557-1 is available in a low
profile 4mm × 4mm × 0.75mm 28-pin QFN package.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. Bat-Track and PowerPath are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118, 6700364. Other patents pending.
TYPICAL APPLICATION
HV SUPPLY
8V TO 38V
(TRANSIENTS
TO 60V)
USB OR
5V ADAPTER
CHARGE
RST
HIGH VOLTAGE
BUCK DC/DC
100mA/500mA
1000mA
0V
CC/CV
CHARGER
LTC3557/LTC3557-1 NTC
ALWAYS ON LDO
TRIPLE HIGH EFFICIENCY
STEP-DOWN
SWITCHING REGULATORS
35571 TA01a
VOUT
+ SINGLE CELL
Li-Ion
3.3V/25mA
0.8V to 3.6V/600mA
0.8V to 3.6V/400mA
0.8V to 3.6V/400mA
Input and Battery Current vs Load Current
600 RPROG = 2k
500 RCLPROG = 2k
IIN
400
ILOAD
300
200
IBAT
(CHARGING)
100
0
IBAT
WALL = 0V
(DISCHARGING)
–100
0 100 200 300 400 500 600
ILOAD (mA)
35571 TA01b
35571fc
1


Linear Technology Electronic Components Datasheet

LTC3557EUF Datasheet

USB Power Manager

No Preview Available !

LTC3557/LTC3557-1
ABSOLUTE MAXIMUM RATINGS
(Notes 1-4)
VBUS, VOUT, VIN1, VIN2
t < 1ms and Duty Cycle < 1% .................. 0.3V to 7V
Steady State............................................. 0.3V to 6V
BAT, NTC, CHRG, WALL, VC,
MODE, FB1, FB2, FB3, RST2........................ 0.3V to 6V
EN1, EN2, EN3 .............................. 0.3V to VOUT + 0.3V
ILIM0, ILIM1, PROG ....................... 0.3V to VCC + 0.3V
IVBUS, IVOUT, IBAT .........................................................2A
ISW1 .....................................................................850mA
ISW2, ISW3 ............................................................600mA
IRST2, ICHRG, IACPR .................................................75mA
ICLPROG, IPROG..........................................................2mA
Maximum Operating Junction Temperature .......... 110°C
Operating Ambient Temperature Range ... 40°C to 85°C
Storage Temperature Range................... 65°C to 125°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23 22
ILIM0 1
ILIM1 2
WALL 3
LDO3V3 4
SW1 5
VIN1 6
FB1 7
21 GATE
20 PROG
19 NTC
29
18 VNTC
17 SW3
16 VIN2
15 SW2
8 9 10 11 12 13 14
UF PACKAGE
28-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 110°C, θJA = 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3557EUF#PBF
LTC3557EUF#TRPBF
3557
28-Lead (4mm × 4mm) Plastic QFN
LTC3557EUF-1#PBF
LTC3557EUF-1#TRPBF 35571
28-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
40°C to 85°C
40°C to 85°C
POWER MANAGER ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VBUS = 5V, VBAT = 3.8V, ILIM0 = ILIM1 = 5V, WALL = EN1 = EN2 = EN3 = 0V, RPROG = 2k, RCLPROG = 2.1k.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Input Power Supply
VBUS
Input Supply Voltage
4.35
5.5
V
IBUS(LIM) Total Input Current (Note 5)
ILIM0 = 0V, ILIM1 = 0V (1x Mode)
ILIM0 = 5V, ILIM1 = 5V (5x Mode)
ILIM0 = 5V, ILIM1 = 0V (10x Mode)
80
90
100
mA
450
475
500
mA
900
950
1000
mA
IBUSQ
Input Quiescent Current
1x, 5x, 10x Modes
ILIM0 = 0V, ILIM1 = 5V (Suspend Mode)
0.35
mA
0.05
0.1
mA
hCLPROG
Ratio of Measured VBUS Current to CLPROG 1x, 5x, 10x Modes
Program Current
1000
mA/mA
VCLPROG
CLPROG Servo Voltage in Current Limit
1x Mode
5x Mode
10x Mode
0.2
V
1.0
V
2.0
V
VUVLO
VBUS Undervoltage Lockout
Rising Threshold
Falling Threshold
3.8
3.9
V
3.5
3.7
V
35571fc
2


Part Number LTC3557EUF
Description USB Power Manager
Maker Linear
PDF Download

LTC3557EUF Datasheet PDF






Similar Datasheet

1 LTC3557EUF USB Power Manager
Linear
2 LTC3557EUF-1 USB Power Manager
Linear





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy