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PDF LTC4160-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC4160-1 | |
| Descripción | Switching Power Manager | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 Ultra-Thin (0.55mm) 20-pin 3mm × 4mm 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 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.
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
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
41601f
1
1 page  
LTC4160/LTC4160-1
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC4160E/LTC4160E-1 are guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: The LTC4160E/LTC4160E-1 include overtemperature protection
that is intended to protect the device during momentary overload
conditions. Junction temperature will exceed 125°C when overtemperature
protection is active. Continuous operation above the specified maximum
operating junction temperature may impair device reliability.
Note 4: Total input current is the sum of quiescent current, IVBUSQ, and
measured current given by VCLPROG/RCLPROG • (hCLPROG + 1).
Note 5: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current rating may result in device
degradation or failure.
Note 6: The bidirectional switcher’s supply current is bootstrapped to
VBUS and in the application will reflect back to VOUT by (VBUS/VOUT) •
1/efficiency. Total quiescent current is the sum of the current into the VOUT
pin plus the reflected current.
Note 7: hC/10 is expressed as a fraction of the measured full charge current
with indicated PROG resistor.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
USB Limited Load Current vs Battery
Voltage (Battery Charger Disabled)
900
VBUS = 5V
800 5x MODE
700
600
500
400
300
200
100
0
2.7
3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
41601 G01
USB Limited Battery Charge
Current vs Battery Voltage
700
600
500
400
300
200
100
0
2.7
VBUS = 5V
5x MODE
RPROG = 1k
3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
41601 G04
USB Limited Load Current vs Battery
Voltage (Battery Charger Disabled)
160
VBUS = 5V
140 1x MODE
120
100
80
60
40
20
0
2.7
3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
41601 G02
USB Limited Battery Charge
Current vs Battery Voltage
140
120
100
80
60
40
20
VBUS = 5V
1x MODE
RPROG = 1k
0
2.7 3.0 3.3 3.6 3.9 4.2
BATTERY VOLTAGE (V)
41601 G05
Battery and VBUS Currents vs
Load Current
750
VBUS CURRENT
500
250
BATTERY CURRENT
(CHARGING)
0
VBUS = 5V
BAT = 3.8V
–250 5x MODE
RCLPROG = 3.01k BATTERY CURRENT
RPROG = 1k
(DISCHARGING)
–500
0
200 400 600 800
1000
LOAD CURRENT (mA)
41601 G03
Battery and VBUS Currents
vs Load Current
1000
VBUS CURRENT
750
500 BATTERY CURRENT
(CHARGING)
250
0
–250
VBUS = 5V
BAT = 3.8V
10x MODE
RCLPROG = 3.01k
RPROG = 2k
BATTERY CURRENT
(DISCHARGING)
–500
0
250 500 750 1000 1250 1500
LOAD CURRENT (mA)
41601 G06
41601f
5
5 Page 
LTC4160/LTC4160-1
PIN FUNCTIONS
low impedance multilayer ceramic capacitor.
VBUS (Pin 13): Power Pin. This pin delivers power to VOUT
via the SW pin by drawing controlled current from a DC
source such as a USB port or DC output wall adapter.
In On-The-Go mode this pin provides power to external
loads. Bypass VBUS with a low impedance multilayer
ceramic capacitor.
SW (Pin 14): The SW pin transfers power between VBUS
to VOUT via the bidirectional switching regulator. See
the Applications Information section for a discussion of
inductance value and current rating.
ILIM0, ILIM1 (Pins 15, 16): ILIM0 and ILIM1 control the VBUS
input current limit of the bidirectional PowerPath switching
regulator in step-down mode. See Table 1. Each has an
internal 1.8μA pull-down current source.
CLPROG (Pin 17): USB Current Limit Program and Monitor
Pin. A 1% resistor from CLPROG to ground determines
the upper limit of the current drawn or sourced from the
VBUS pin. A precise fraction, hCLPROG, of the VBUS current
is sent to the CLPROG pin when the PMOS switch of the
bidirectional PowerPath switching regulator is on. The
switching regulator delivers power until the CLPROG pin
reaches 1.18V in step-down mode and 1.15V in step-up
mode. When the switching regulator is in step-down mode,
CLPROG is used to regulate the average input current.
Several VBUS current limit settings are available via user
input which will typically correspond to the 500mA and
100mA USB specifications. When the switching regulator
is in step-up mode (USB On-The-Go), CLPROG is used to
limit the average output current to 680mA. A multilayer
ceramic averaging capacitor or R-C network is required
at CLPROG for filtering.
LDO3V3 (Pin 18): 3.3V LDO Output Pin. This pin provides
a regulated always-on 3.3V supply voltage. LDO3V3
gets its power from VOUT. It may be used for light loads
such as a watch dog microprocessor or real time clock.
A 1μF capacitor is required from LDO3V3 to ground. If
the LDO3V3 output is not used it should be disabled by
connecting it to VOUT.
NTCBIAS (Pin 19): NTC Thermistor Bias Output. If NTC
operation is desired, connect a bias resistor between
NTCBIAS and NTC, and an NTC thermistor between NTC
and GND. To disable NTC operation, connect NTC to GND
and leave NTCBIAS open.
NTC (Pin 20): Input to the Thermistor Monitoring Circuits.
The NTC pin connects to a negative temperature coefficient
thermistor, which is typically co-packaged with the battery,
to determine if the battery is too hot or too cold to charge.
If the battery’s temperature is out of range, charging is
paused until it re-enters the valid range. A low drift bias
resistor is required from NTCBIAS to NTC and a thermistor
is required from NTC to ground. To disable NTC operation,
connect NTC to GND and leave NTCBIAS open.
Exposed Pad (Pin 21): Ground. The Exposed Pad should
be connected to a continuous ground plane on the second
layer of the printed circuit board by several vias directly
under the LTC4160/LTC4160-1.
41601f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4160-1.PDF ] | |
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