Document
FEATURES
n Bidirectional Switching Regulator Makes Optimal Use of Limited Power Available from USB Port and also Provides a 5V Output for USB On-The-Go
n Overvoltage Protection Guards Against Damage n 180mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Seamlessly Provides Low Loss PowerPath When Input Power is Limited or Unavailable n Instant-On Operation with Discharged Battery n Full Featured Li-Ion/Polymer Battery Charger n Bat-Track™ Adaptive Output Control For Efficient Charging n 1.2A Max Input Current Limit n 1.2A Max Charge Current with Thermal Limiting n Battery Float Voltage: 4.2V (LTC4160), 4.1V (LTC4160-1) n Low Battery Powered Quiescent Current (8µA) n 20-pin 3mm × 4mm × 0.75mm QFN Package
APPLICATIONS
n Media Players and Personal Navigation Devices n Digital Cameras, PDAs, Smart Phones
LTC4160/LTC4160-1
Switching Power Manager with USB On-The-Go And Overvoltage Protection
DESCRIPTION
The LTC®4160/LTC4160-1 are high efficiency power management and Li-Ion/Polymer battery charger ICs. They each include a bidirectional switching PowerPath™ controller with automatic load prioritization, a battery charger, and an ideal diode.
The LTC4160/LTC4160-1’s bidirectional switching regulator transfers nearly all of the power available from the USB port to the load with minimal loss and heat which eases thermal constraints in small spaces. These devices feature a precision input current limit for USB compatibility and Bat-Track output control for efficient charging. In addition, the ICs can also generate 5V at 500mA for USB On-TheGo applications.
An overvoltage circuit protects the LTC4160/LTC4160-1 from high voltage damage on the USB/wall adapter inputs with an external N-channel MOSFET and a resistor.
The LTC4160/LTC4160-1 are available in a 3mm × 4mm × 0.75mm QFN surface mount package.
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks and PowerPath and Bat-Track are a trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6522118, 6404251. Other patents pending.
VBUS (V) CURRENT (mA)
TYPICAL APPLICATION
USB OTG VBUS Voltage vs VBUS Current
5.5 VOUT = BAT = 3.8V
5.0 VBUS = 4.75V
4.5
USB 2.0 SPECIFICATIONS 4.0 REQUIRE THAT HIGH
POWER DEVICES NOT OPERATE IN THIS REGION 3.5
IVBUS = 500mA
3.0 0
100 200 300 400 500 600 700
VBUS CURRENT (mA)
41601 TA01b
High Efficiency Power Manager/Battery Charger with USB On-The-Go and Overvoltage Protection
USB ON-THE-GO
USB 10µF
6.2k OPTIONAL OVERVOLTAGE PROTECTION
VBUS
SW
LTC4160/ LTC4160-1 VOUT
OVGATE
OVSENS
BAT
CLPROG PROG
0.1µF 3.01k 1k
3.3µH
SYSTEM LOAD
10µF
+
Li-Ion
41601 TA01a
Battery and VBUS Currents vs Load Current
750
500
VBUS CURRENT
250 BATTERY CURRENT (CHARGING)
0 –250
VBUS = 5V BAT = 3.8V 5x MODE
–500 0
BATTERY CURRENT (DISCHARGING)
200 400 600 800 1000
LOAD CURRENT (mA)
41601 TA01c
41601fa
1
LTC4160/LTC4160-1
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2, 3)
VBUS (Transient) t < 1ms, Duty Cycle < 1%... –0.3V to 7V VBUS (Static), BAT, VOUT, NTC, ENOTG, ID, ENCHARGER, VBUSGD, FAULT, CHRG......... –0.3V to 6V
ILIM0, IILIM1......... –0.3V to Max(VBUS, VOUT, BAT) + 0.3V IOVSENS....................................................................10mA ICLPROG.....................................................................3mA ICHRG, IVBUSGD, IFAULT.............................................50mA IPROG.........................................................................2mA ILDO3V3....................................................................30mA ISW, IBAT, IVOUT, IVBUS...................................................2A Operating Temperature Range.................. –40°C to 85°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range.................... –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
NTC NTCBIAS LDO3V3 CLPROG
OVGATE 1 OVSENS 2 VBUSGD 3
FAULT 4 ID 5
ENOTG 6
20 19 18 17
16 ILIM1
15 ILIM0
21
14 SW
GND
13 VBUS
12 VOUT
11 BAT
7 8 9 10
ENCHARGER PROG CHRG
IDGATE
UDC PACKAGE 20-LEAD (3mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING PACKAGE DESCRIPTION
LTC4160EUDC#PBF
LTC4160EUDC#TRPBF LFXY
20-Lead (3mm × 4mm) Plastic QFN
LTC4160EUDC-1#PBF
LTC4160EUDC-1#TRPBF LFXZ
20-Lead (3mm × 4mm) Plastic QFN
LTC4160EPDC#PBF
LTC4160EPDC#TRPBF FDRT
20-Lead (3mm × 4mm) Plastic UTQFN
LTC4160EPDC-1#PBF
LTC4160EPDC-1#TRPBF FDST
20-Lead (3mm × 4mm) 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: .