LTC4160-1_15 Datasheet, PDF (1/32 Pages) Linear Technology – Switching Power Manager with USB On-The-Go And Overvoltage Protection

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 man-
agement 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-The-
Go 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.
TYPICAL APPLICATION
USB OTG V_BUS Voltage
vs V_BUS Current
5.5
V_OUT = BAT = 3.8V
5.0
V_BUS = 4.75V
4.5
USB 2.0 SPECIFICATIONS
4.0 _{REQUIRE THAT HIGH}
POWER DEVICES NOT
OPERATE IN THIS REGION
3.5
3.0
0
100 200 300 400 500 600 700
V_BUS 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
V_BUS
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 V_BUS Currents
vs Load Current
750
500
V_BUS CURRENT
250
BATTERY CURRENT
(CHARGING)
0
–250
V_BUS = 5V
BAT = 3.8V
5x MODE
–500
0
BATTERY CURRENT
(DISCHARGING)
200 400 600 800 1000
LOAD CURRENT (mA)
41601 TA01c
41601fa
1