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LTC4160

Description
Switching Power Manager with USB On-The-Go And Overvoltage Protection
File Size350KB,32 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4160 Overview

Switching Power Manager with USB On-The-Go And Overvoltage Protection

FEATURES
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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 the ultra-thin
(0.55 mm) 20-pin 3mm
×
4mm UTQFN surface mount
package.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. 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.
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Bidirectional Switching Regulator Makes Optimal
Use of Limited Power Available from USB Port and
also Provides a 5V Output for USB On-The-Go
Overvoltage Protection Guards Against Damage
180mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Seamlessly Provides Low
Loss PowerPath When Input Power is Limited or
Unavailable
Instant-On Operation with Discharged Battery
Full Featured Li-Ion/Polymer Battery Charger
Bat-Track™ Adaptive Output Control For Efficient
Charging
1.2A Max Input Current Limit
1.2A Max Charge Current with Thermal Limiting
Battery Float Voltage: 4.2V (LTC4160), 4.1V
(LTC4160-1)
Low Battery Powered Quiescent Current (8μA)
Ultra-Thin (0.55mm) 20-pin 3mm
×
4mm QFN
Package
APPLICATIONS
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Media Players and Personal Navigation Devices
Digital Cameras, PDAs, Smart Phones
TYPICAL APPLICATION
USB OTG V
BUS
Voltage
vs V
BUS
Current
5.5
V
OUT
= BAT = 3.8V
USB
V
BUS
= 4.75V
V
BUS
(V)
4.5
I
VBUS
= 500mA
USB 2.0 SPECIFICATIONS
REQUIRE THAT HIGH
POWER DEVICES NOT
OPERATE IN THIS REGION
6.2k
OPTIONAL
OVERVOLTAGE
PROTECTION
10μF
High Efficiency Power Manager/Battery Charger with USB
On-The-Go and Overvoltage Protection
USB
ON-THE-GO
V
BUS
LTC4160/
LTC4160-1
OVGATE
OVSENS
CLPROG
BAT
PROG
Li-Ion
SW
V
OUT
CURRENT (mA)
10μF
3.3μH
SYSTEM
LOAD
750
Battery and V
BUS
Currents
vs Load Current
V
BUS
CURRENT
5.0
500
250
BATTERY CURRENT
(CHARGING)
0
V
BUS
= 5V
BAT = 3.8V
5x MODE
BATTERY CURRENT
(DISCHARGING)
–500
0
200
600
800
400
LOAD CURRENT (mA)
1000
41601 TA01c
4.0
+
3.5
0.1μF
3.01k
1k
41601 TA01a
–250
3.0
0
100
200 300 400 500
V
BUS
CURRENT (mA)
600
700
41601 TA01b
41601f
1

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