Power Manager. LTC3557-1 Datasheet

LTC3557-1 Manager. Datasheet pdf. Equivalent

Part LTC3557-1
Description USB Power Manager
Feature www.DataSheet4U.com LTC3557/LTC3557-1 USB Power Manager with Li-Ion Charger and Three Step-Down Reg.
Manufacture Linear Technology
Datasheet
Download LTC3557-1 Datasheet




LTC3557-1
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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 Power-
PathTM 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 ap-
plications. Battery charge current is automatically reduced
such that the sum of the load current and the charge cur-
rent 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 x 4mm x 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
CC/CV
CHARGER
0V
LTC3557/LTC3557-1 NTC
ALWAYS ON LDO
TRIPLE HIGH EFFICIENCY
STEP-DOWN
SWITCHING REGULATORS
35571 TA01a
VOUT
+ SINGLE CELL
Li-Ion
3.3V/20mA
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
WALL = 0V
–100
0 100 200
IBAT
(DISCHARGING)
300 400 500
600
ILOAD (mA)
35571 TA01b
35571f
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LTC3557-1
www.DataSheet4U.com
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 × 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
450
900
90 100
475 500
950 1000
mA
mA
mA
IBUSQ
Input Quiescent Current
1x, 5x, 10x Modes
ILIM0 = 0V, ILIM1 = 5V (Suspend Mode)
0.35
0.05 0.1
mA
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
3.5 3.7
V
V
35571f
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