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PDF LTC3553 Data sheet ( Hoja de datos )
| Número de pieza | LTC3553 | |
| Descripción | Micropower USB Power Manager | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC3553 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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LTC3553
FEATURES
Micropower USB Power
Manager With Li-Ion Charger,
LDO and Buck Regulator
DESCRIPTION
n 12μA 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 Provides Low Loss
PowerPath™
n High Efficiency 200mA Buck Regulator
n 150mA Low Dropout (LDO) Linear Regulator
n Pushbutton On/Off Control With System Reset
n Full Featured Li-Ion/Polymer Battery Charger
n Programmable Charge Current With Thermal Limiting
n Instant-On Operation With Discharged Battery
n Compact Ultra-Thin 3mm × 3mm × 0.55mm
20-Pin UTQFN Package
APPLICATIONS
n USB-Based Handheld Products
n Portable Li-Ion/Polymer Based Electronic Devices
n Wearable Electronics
n Low Power Medical Devices
The LTC®3553 is a micropower, highly integrated power
management and battery charger IC for single-cell
Li-Ion/Polymer battery applications. It includes 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 LTC3553 power manager automatically limits
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 LTC3553
also includes a synchronous buck regulator, a low dropout
linear regulator (LDO), and a pushbutton controller. With
all supplies enabled in standby mode, the quiescent cur-
rent drawn from the battery is only 12μA. The LTC3553
is available in an ultrathin (0.55mm) 3mm × 3mm 20-pin
UTQFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. PowerPath is a trademark 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 and other patents pending.
TYPICAL APPLICATION
4.35V TO 5.5V
USB INPUT
100k 10μF
100k
T
1.87k
VBUS
VOUT
10μF
NTC LTC3553 CHRG
PROG
BAT
+ Li-Ion
BATTERY
SYSTEM
LOAD
SEQ BVIN
VINLDO
2.2μF
DIGITAL
CONTROL
ON/OFF
HPWR
SUSP
LDO_ON
BUCK_ON
STBY
PBSTAT
ON
LDO
LDO_FB
2.05M
3.3V
150mA
4.7μF
649k
SW
BUCK_FB
3553 TA01a
10μH
10pF
332k
1.2V
200mA
10μF
649k
www.DataSheet.in
Battery Drain Current
vs Temperature
18
VBAT = 3.8V
16 STBY = 3.8V
REGULATORS LOAD = 0mA
14
BUCK AND LDO ON
12
10 ONLY LDO ON
8 ONLY BUCK ON
6
BUCK AND LDO OFF
4
2
HARD RESET
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3553 TA01b
3553f
1
1 page  
LTC3553
LDO REGULATOR ELECTRICAL CHARACTERISTICS
The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
LDO_ON = VOUT = VINLDO = 3.8V, STBY = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VINLDO
Input Voltage Range
(Note 9)
l 1.65
VOUT UVLO VOUT Undervoltage Lockout
VOUT Falling
VOUT Rising
2.5
VLDO_FB Regulated Feedback Voltage
ILDO = 1mA, STBY High or Low (Note 10)
l 780
VLDO_FB Line Regulation
ILDO = 1mA, VINLDO = 1.65V to 5.5V (Note 10)
VLDO_FB Load Regulation
ILDO = 1mA to 150mA (Note 10)
ILDO_FB Feedback Pin Input Current
–50
ILDO_OC Available Output Current
l 150
ILDO_SC Short-Circuit Output Current
(Note 7)
VDROP
Dropout Voltage (Note 13)
ILDO = 150mA, VINLDO = 3.8V
ILDO = 150mA, VINLDO = 2.5V
ILDO = 75mA, VINLDO = 1.8V
tLDO_SS Soft-Start Time
RLDO_PD Output Pull-Down Resistance in Shutdown LDO_ON = 0V
2.6
2.8
800
0.7
0.025
300
160
220
180
0.2
10
5.5 V
V
2.9 V
820 mV
mV/V
mV/mA
50 nA
mA
mA
260 mV
350 mV
280 mV
ms
kΩ
PUSHBUTTON INTERFACE ELECTRICAL CHARACTERISTICS
The l denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VBAT = 3.8V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Pushbutton Pin (ON)
VCC_PB
VON_TH
Pushbutton Operating Supply Range
ON Threshold Rising
ON Threshold Falling
ION ON Input Current
RPB_PU
Pushbutton Pull-Up Resistance
Logic Input Pins (BUCK_ON, LDO_ON, SEQ)
(Notes 4 , 9)
VON = VCC (Note 4)
Pull-Up to VCC (Note 4)
l 2.7
5.5
1.2
0.4
–1 1
200 400 650
V
V
V
μA
kΩ
Input High Voltage
Input Low Voltage
1.2 V
0.4 V
Input Current
–1 1 μA
Status Output Pin (PBSTAT)
IPBSTAT
VPBSTAT
PBSTAT Output High Leakage Current
PBSTAT Output Low Voltage
VPBSTAT = 3V
IPBSTAT = 3mA
–1 1
0.1 0.4
μA
V
www.DataSheet.in
3553f
5
5 Page 
LTC3553
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise specified.
LDO Dropout Voltage at
VINLDO = 3.8V
300
–45°C
25°C
250 90°C
200
LDO Dropout Voltage at
VINLDO = 2.5V
300
–45°C
25°C
250 90°C
200
LDO Dropout Voltage at
VINLDO = 1.8V
300
–45°C
25°C
250 90°C
200
150 150
150
100 100
100
50 50
50
0
0 25 50 75 100 125 150
LDO LOAD (mA)
3553 G37
0
0 25 50 75 100 125 150
LDO LOAD (mA)
3553 G38
0
0 15 30 45 60 75
LDO LOAD (mA)
3553 G39
LDO Output Transient
(STBY = Low)
LDO Output Transient
(STBY = High)
LDO Rejection of Buck
Output Ripple
VOUT
50mV/DIV
(AC)
LDO (3.3V)
50mV/DIV
(AC)
100mA
ILDO
1mA
VBUS = 0V
VBAT = 3.8V
STBY = LOW
50μs/DIV
VOUT
50mV/DIV
(AC)
LDO (3.3V)
100mV/DIV
(AC)
3553 G40
100mA
ILDO
1mA
VBUS = 0V
VBAT = 3.8V
STBY = HIGH
50μs/DIV
BUCK OUTPUT
1.8V
10mV/DIV (AC)
LDO OUTPUT
1.2V
10mV/DIV (AC)
3553 G41
10μs/DIV
BUCK OUTPUT CONNECTED TO VINLDO
5mA LDO LOAD
4.7μF LDO OUTPUT CAPACITOR
VBAT = 3.8V, VBUS = 0V
3553 G42
www.DataSheet.in
3553f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3553.PDF ] | |
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