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Linear Technology Electronic Components Datasheet

LTC3553EUD Datasheet

Micropower USB Power Manager

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LTC3553
Features
Micropower USB Power
Manager With Li-Ion Charger,
LDO and Buck Regulator
Description
n 12μA Standby Mode Quiescent Current (All Outputs On)
n Seamless Transition Between Input Power Sources:
Li-Ion/Polymer Battery and USB
n 240mΩ Internal Ideal Diode Provides Low Loss
PowerPath™
n High Efficiency 200mA Buck Regulator
n 150mA Low Dropout (LDO) Linear Regulator
n Pushbutton On/Off Control With System Reset
n Full Featured Li-Ion/Polymer Battery Charger
n Programmable Charge Current With Thermal Limiting
n Instant-On Operation With Discharged Battery
n 3mm × 3mm × 0.75mm 20-Pin QFN Package
Applications
n USB-Based Handheld Products
n Portable Li-Ion/Polymer Based Electronic Devices
n Wearable Electronics
n Low Power Medical Devices
The LTC®3553 is a micropower, highly integrated power
management and battery charger IC for single-cell
Li-Ion/Polymer battery applications. It includes a
PowerPath manager with automatic load prioritization,
a battery charger, an ideal diode and numerous internal
protection features. Designed specifically for USB applica-
tions, the LTC3553 power manager automatically limits
input current to a maximum of either 100mA or 500mA.
Battery charge current is automatically reduced such that
the sum of the load current and the charge current does
not exceed the selected input current limit. The LTC3553
also includes a synchronous buck regulator, a low dropout
linear regulator (LDO), and a pushbutton controller. With
all supplies enabled in standby mode, the quiescent cur-
rent drawn from the battery is only 12μA. The LTC3553 is
available in a 3mm × 3mm × 0.75mm 20-pin QFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath, Hot Swap and Bat-Track are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6522118, 6700364, 5481178, 6304066, 6570372, 6580258, 7511390 and other patents pending.
Typical Application
4.35V TO 5.5V
USB INPUT
100k
10µF
100k T
1.87k
VBUS
VOUT
10µF
NTC LTC3553 CHRG
PROG
BAT
+ Li-Ion
BATTERY
SYSTEM
LOAD
SEQ
BVIN
VINLDO
2.2µF
DIGITAL
CONTROL
ON/OFF
HPWR
SUSP
LDO_ON
BUCK_ON
STBY
PBSTAT
ON
LDO
LDO_FB
2.05M
3.3V
150mA
4.7µF
649k
SW
BUCK_FB
3553 TA01a
10µH
10pF
332k
649k
1.2V
200mA
10µF
Battery Drain Current
vs Temperature
18
VBAT = 3.8V
16 STBY = 3.8V
REGULATORS LOAD = 0mA
14
BUCK AND LDO ON
12
10
ONLY LDO ON
8
ONLY BUCK ON
6
BUCK AND LDO OFF
4
2
HARD RESET
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3553 TA01b
3553fc
1


Linear Technology Electronic Components Datasheet

LTC3553EUD Datasheet

Micropower USB Power Manager

No Preview Available !

LTC3553
Absolute Maximum Ratings
(Notes 1, 2, 3)
VBUS, VOUT
t < 1ms and Duty Cycle < 1%................... –0.3V to 7V
Steady State.............................................. –0.3V to 6V
BAT, NTC, CHRG, SUSP, PBSTAT,
ON, BUCK_FB, LDO_FB................................. –0.3V to 6V
BUCK_ON, LDO_ON, STBY, SEQ, HPWR,
BVIN, VINLDO, LDO (Note 4)..............–0.3V to VCC + 0.3V
IBAT..............................................................................1A
ISW (Continuous)..................................................300mA
ILDO (Continuous).................................................175mA
ICHRG, IPBSTAT..........................................................75mA
Operating Temperature Range.................. –40°C to 85°C
Junction Temperature............................................ 110°C
Storage Temperature Range.................... –65°C to 125°C
Pin Configuration
TOP VIEW
20 19 18 17 16
HPWR 1
15 NTC
SEQ 2
14 CHRG
PBSTAT 3
21
GND
13 SW
ON 4
12 BVIN
LDO_ON 5
11 VINLDO
6 7 8 9 10
UD PACKAGE
20-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 110°C, θJA = 58.7°C/W
EXPOSED PAD (PIN 21) IS GND, AND MUST BE SOLDERED TO PCB GND
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3553EUD#PBF
LTC3553EUD#TRPBF LFYB
20-Lead (3mm × 3mm) Plastic QFN
LTC3553EPD#PBF
LTC3553EPD#TRPBF FHST
20-Lead (3mm × 3mm) Plastic UTQFN
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 (OBSOLETE)
POWER MANAGER Electrical Characteristics
The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C (Note 2),
VBUS = 5V, VBAT = 3.8V, HPWR = SUSP = BUCK_ON = LDO_ON = 0V, RPROG = 1.87k, STBY = high, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
No-Load Quiescent Currents
IBATQ
Battery Drain Current (Note 5)
Buck and LDO Shutdown, Hard Reset
Buck and LDO Shutdown
Buck and LDO Enabled, Standby Mode
Buck and LDO Enabled
Buck Enabled, LDO Shutdown
LDO Enabled, Buck Shutdown
IOUT = ISW = ILDO = 0
VBUS = 0V, Hard Reset
VBUS = 0V
VBUS = 0V, BUCK_ON = LDO_ON = STBY = 3.8V
VBUS = 0V, BUCK_ON = LDO_ON = 3.8V,
STBY = 0V
VBUS = 0V, BUCK_ON = 3.8V, LDO_ON = 0V
STBY = 0V
VBUS = 0V, LDO_ON = 3.8V, BUCK_ON = 0V,
STBY = 0V
0.2
2
µA
3
5
µA
8
16
µA
16
35
µA
6.5
15
µA
16
35
µA
IBATQC
Battery Drain Current, VBUS Available
VBAT = VFLOAT, Timer Timed Out
5
8
µA
IBUSQ
VBUS Input Current
100mA, 500mA Modes
Charger On
Timer Timed Out
SUSP = 5V (Suspend Mode)
300
500
µA
150
350
µA
15
30
µA
3553fc
2


Part Number LTC3553EUD
Description Micropower USB Power Manager
Maker Linear
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