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PDF LTC3554-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC3554-2 | |
| Descripción | Micropower USB Power Manager | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
Features
Micropower USB Power
Manager with Li-Ion Charger
and Two Step-Down Regulators
Description
n 10μA 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
n Dual High Efficiency Step-Down Switching Regulators
(200mA IOUT) with Adjustable Output Voltages
n Pushbutton On/Off Control with System Reset
n Reset Time: 5 sec (LTC3554/LTC3554-1),
14 sec (LTC3554-2/LTC3554-3)
n Full Featured Li-Ion/Polymer Battery Charger
n Programmable Charge Current with Thermal Limiting
n Instant-On Operation with Discharged Battery
n Battery Float Voltage: 4.2V (LTC3554/LTC3554-2/
LTC3554-3), 4.1V (LTC3554-1)
n 3mm × 3mm × 0.75mm 20-Lead QFN Package
Applications
n USB-Based Handheld Products
n Portable Li-Ion/Polymer Based Electronic Devices
n Fitness Computers
n Low Power Medical Devices
The LTC®3554 family* are micropower, highly integrated
power management and battery charger ICs for single-cell
Li-Ion/Polymer battery applications. They include 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 LTC3554 power managers automatically limit
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 LTC3554 also includes two synchronous step-down
switching regulators as well as a pushbutton controller.
With all supplies enabled in standby mode, the quiescent
current drawn from the battery is only 10μA. The LTC3554
family are available in a 3mm × 3mm × 0.75mm 20-lead
QFN package.
L, LT, LTC, LTM, Burst Mode, 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.
*See table on page 2 for available options.
Typical Application
4.35V TO 5.5V
USB INPUT
100k
10µF
100k T
1.87k
VBUS
VOUT
NTC LTC3554 CHRG
PROG
BAT
10µF
+ Li-Ion
BATTERY
ON/OFF
HPWR
SUSP
PWR_ON1
FSEL
STBY
PGOOD
PWR_ON2
PBSTAT
ON
BVIN
SW1
FB1
2.2µF
4.7µH
10pF
SW2
FB2
3554 TA01a
10µH
10pF
2.05M
649k
332k
649k
SYSTEM
LOAD
3.3V
200mA
10µF
1.2V
200mA
10µF
Battery Drain Current
vs Temperature
14 VBAT = 3.8V
12
STBY = 3.8V
REGULATORS LOAD = 0mA
10
BOTH REGULATORS
ENABLED
8
ONE REGULATOR ENABLED
6
4 BOTH REGULATORS DISABLED
2
HARD RESET
0
–75 –50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3554 TA01b
3554123ff
1
1 page  
LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
S witching Regulator Ele ctrical Characteristics The l denotes
specifications
VOUT = BVIN =
that apply over the full operating junction
3.8V, PWR_ON1 = PWR_ON2 = 0V, unless
temperature range,
otherwise noted.
otherwise
specifications
are
at
TA
=
25°C
(Note
2).
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Switching Regulator 2 in Normal Operation (STBY Low)
ILIM2 Peak PMOS Current Limit
VFB2 Regulated Feedback Voltage
D2 Max Duty Cycle
PWR_ON2 = 3.8V (Note 7)
PWR_ON2 = 3.8V
300 450
600
l 780 800 820
100
mA
mV
%
RP2 RDS(ON) of PMOS
RN2 RDS(ON) of NMOS
Switching Regulator 2 in Standby Mode (STBY High)
ISW2 = 100mA
ISW2 = –100mA
1.1 Ω
0.7 Ω
VFB2_LOW
ISHORT2_SB
VDROP2_SB
Feedback Voltage Threshold
Short-Circuit Current
Standby Mode Dropout Voltage
PWR_ON2 = 3.8V, VFB2 Falling
l
PWR_ON2 = 2.9V, ISW2 = 5mA, VFB2 = 0.77V, VOUT
= 2.9V, BVIN = 2.9V
770
10
800
21
25
820
50
60
mV
mA
mV
P USHBUTTON INTERFACE Ele ctrical Characteristics The l denotes
specifications that apply over
VBAT = 3.8V, unless otherwise
the full
noted.
operating
junction
temperature
range,
otherwise
specifications
are
at
TA
=
25°C
(Note
2).
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Pushbutton Pin (ON)
VCC_PB
VON_TH
Pushbutton Operating Supply Range
ON Threshold Rising
ON Threshold Falling
(Notes 4 , 9)
l 2.7
0.4
5.5 V
1.2 V
V
ION ON Input Current
RPB_PU
Pushbutton Pull-Up Resistance
Logic Input Pins (PWR_ON1, PWR_ON2)
VON = VCC (Note 4)
Pull-Up to VCC (Note 4)
–1
200 400
1
650
µA
kΩ
VPWR_ONx PWR_ONx Threshold Rising
PWR_ONx Threshold Falling
1.2 V
0.4 V
IPWR_ONx PWR_ONx Input Current
Status Output Pins (PBSTAT, PGOOD)
–1 1 µA
IPBSTAT
PBSTAT Output High Leakage Current
VPBSTAT PBSTAT Output Low Voltage
IPGOOD
PGOOD Output High Leakage Current
VPGOOD PGOOD Output Low Voltage
VTHPGOOD PGOOD Threshold Voltage
Pushbutton Timing Parameters (Note 11)
VPBSTAT = 3V
IPBSTAT = 3mA
VPGOOD = 3V
IPGOOD = 3mA
(Note 10)
–1 1
0.1 0.4
–1 1
0.1 0.4
–8
µA
V
µA
V
%
tON_PBSTATL Minimum ON Low Time to Cause PBSTAT ON Brought Low During Power-On (PON) or
Low Power-Up (PUP1, PUP2) States
50 ms
tON_
PBSTATH
Delay from ON High to PBSTAT High
Power-On (PON) State, After PBSTAT Has Been
Low for at Least tPBSTAT_PW
900
µs
tON_PUP
Minimum ON Low Time to Enter
Power-Up (PUP1 or PUP2) State
Starting in the Hard Reset (HR) or Power-Off
(POFF) States
400 ms
tON_HR
Minimum ON Low Time to Hard Reset
ON Brought Low During the Power-On (PON)or
Power-Up (PUP1, PUP2) States
LTC3554/LTC3554-1
LTC3554-2/LTC3554-3
45
11 14
6
17
s
s
tPBSTAT_PW PBSTAT Minimum Pulse Width
Power-On (PON) or Power-Up (PUP1, PUP2)
States
40 50
ms
3554123ff
5
5 Page 
LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
Pin Functions
HPWR (Pin 1): High Power Logic Input. When this pin is
low the input current limit is set to 100mA and when this
pin is driven high it is set to 500mA. The SUSP pin needs
to be low for the input current limit circuit to be enabled.
This pin has a conditional internal pull-down resistor when
power is applied to the VBUS pin.
FSEL (Pin 2): Buck Frequency Select. When this pin is
low the buck switching frequency is set to 1.125MHz and
when this pin is driven high it is set to 2.25MHz.
PBSTAT (Pin 3): Pushbutton Status. This open-drain output
is a debounced and buffered version of the ON pushbut-
ton input. It may be used to interrupt a microprocessor.
PGOOD (Pin 4): Power Good. This open-drain output
indicates that all enabled buck regulators have been in
regulation for at least 230ms.
ON (Pin 5): Pushbutton Input. Weak internal pull-up
forces a high state if ON is left floating. A normally open
pushbutton is connected from ON to ground to force a
low state on this pin.
FB1 (Pin 6): Feedback Input for Step-Down Switching
Regulator 1. This pin servos to a fixed voltage of 0.8V
when the control loop is complete.
FB2 (Pin 7): Feedback Input for Step-Down Switching
Regulator 2. This pin servos to a fixed voltage of 0.8V
when the control loop is complete.
PWR_ON2 (Pin 8): Logic Input Enables Step-Down Switch-
ing Regulator 2.
PWR_ON1 (Pin 9): Logic Input Enables Step-Down Switch-
ing Regulator 1.
STBY (Pin 10): Standby Mode. When this pin is driven
high the part enters a very low quiescent current mode.
The buck regulators are each limited to 5mA maximum
load current in this mode.
SW2 (Pin 11): Power Transmission (Switch) Pin for Step-
Down Switching Regulator 2.
BVIN (Pin 12): Power Input for Step-Down Switching
Regulators 1 and 2. It is recommended that this pin be
connected to the VOUT pin. It should be bypassed with a
low impedance multilayer ceramic capacitor.
SW1 (Pin 13): Power Transmission (Switch) Pin for Step-
Down Switching Regulator 1.
CHRG (Pin 14): Open-Drain Charge Status Output. This pin
indicates the status of the battery charger. It is internally
pulled low while charging. Once the battery charge cur-
rent reduces to less than one-tenth of the programmed
charge current, this pin goes into a high impedance state.
An external pull-up resistor and/or LED is required to
provide indication.
NTC (Pin 15): The NTC pin connects to a battery’s therm-
istor 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 drops back into range. A low drift bias
resistor is required from VBUS to NTC and a thermistor is
required from NTC to ground. If the NTC function is not
desired, the NTC pin should be grounded.
PROG (Pin 16): Charge Current Program and Charge
Current Monitor Pin. Connecting a resistor from PROG to
ground programs the charge current as given by:
ICHG
(A)
=
750V
RPROG
If sufficient input power is available in constant-current
mode, this pin servos to 1V. The voltage on this pin always
represents the actual charge current.
BAT (Pin 17): Single-Cell Li-Ion Battery Pin. Depending
on available power and load, a Li-Ion battery on BAT will
either deliver system power to VOUT through the ideal
diode or be charged from the battery charger.
VOUT (Pin 18): Output Voltage of the PowerPath Control-
ler and Input Voltage of the Battery Charger. The majority
of the portable products should be powered from VOUT.
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11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3554-2.PDF ] | |
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