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| 型号： | LTC3554EPD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, UTQFN-20 |
| 文件页数： | 33/36页 |
| 文件大小： | 418K |
| 代理商： | LTC3554EPD#TRPBF |
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LTC3554/LTC3554-2
6
35542fb
VBUS Supply Current
vs Temperature
VBUS Supply Current
vs Temperature (Suspend Mode)
Battery Drain Current
vs Temperature
VBUS Current Limit
vs Temperature
The junction temperature (TJ, in °C) is calculated from the ambient
temperature (TA, in °C) and power dissipation (PD, in Watts) according
to the formula:
TJ = TA + (PD θJA), where θJA (in °C/W) is the package thermal
impedance.
Note 3. This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 110°C when overtemperature protection is
active. Continuous operation above the specied maximum operating
junction temperature may result in device degradation or failure.
Note 4. VCC is the greater of VBUS or BAT.
Note 5. Total Battery Drain Current is the sum of IBATQ and IOUT. For
example, in applications where the buck input (BVIN pin) is connected
to the PowerPath output (VOUT pin) such that IOUT = IBVIN, total battery
drain current = IBATQ + IBVIN.
Note 6. hC/10 is expressed as a fraction of programmed full charge
current with specied PROG resistor.
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise specied.
ELECTRICAL CHARACTERISTICS
TEMPERATURE (°C)
–75
200
I BUS
(μA) 300
350
400
–25
25
50
150
3554 G01
250
–50
0
75 100 125
VBUS = 5V
HPWR = L
TEMPERATURE (°C)
–75
0
I BUS
(μA)
10
15
25
20
–25
25
50
150
3554 G02
5
–50
0
75 100 125
VBUS = 5V
TEMPERATURE (°C)
–75 –50 –25
25
50
75
100 125
0
BA
TTER
Y
DRAIN
CURRENT
(μA)
4
6
10
14
12
8
3554 G03
2
BOTH REGULATORS DISABLED
ONE REGULATOR ENABLED
HARD RESET
BOTH REGULATORS
ENABLED
VBAT = 3.8V
STBY = 3.8V
REGULATORS LOAD = 0mA
TEMPERATURE (°C)
–75
0
I BA
T(μA)
2
3
5
4
–25
25
50
150
3554 G03b
1
–50
0
75 100 125
VBUS = 5V
VBAT = 3.8V
TEMPERATURE (°C)
–75
0
I VBUS
(mA)
200
300
500
400
–25
25
50
3554 G04
100
–50
0
75
100 125
VBUS = 5V
HPWR = H
HPWR = L
Battery Drain Current
vs Temperature (Suspend Mode)
LOAD CURRENT (mA)
0
100
300
500
400
200
–100
CURRENT
(mA)
100
200
400
600
500
300
3554 G05
0
RPROG = 1.87k
IVBUS
ILOAD
IBAT
(CHARGING)
IBAT
(DISCHARGING)
VBUS and Battery Current
vs Load Current
Note 7. The current limit features of this part are intended to protect
the IC from short term or intermittent fault conditions. Continuous
operation above the absolute maximum specied pin current rating may
result in device degradation or failure.
Note 8. FB High, Not Switching
Note 9. VOUT not in UVLO.
Note 10. PGOOD threshold is expressed as a percentage difference from
the buck regulation voltage. The threshold is measured with the buck
feedback pin voltage rising.
Note 11. See the Operation section of this data sheet for detailed
explanation of the pushbutton state machine and the effects of each
state on switching regulator and power manager operation.
Note 12. If VBUS < VUVLO then VFWD = 0 and the forward voltage across
the ideal diode is equal to its current times RDROPOUT.
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