LTC3577-4_15 Datasheet, PDF (15/52 Pages) Linear Technology – Highly Integrated Portable Product PMIC

LTC3577-3/LTC3577-4
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified
LED Boost Start-Up Transient
I_LED
10mA/DIV
V_BOOST
20V/DIV
I_L
200mA/DIV
2ms/DIV
357734 G43
LED Boost Current Limit
vs Temperature
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
–40 –20
0 20 40 60 80 100 120
TEMPERATURE (°C)
357734 G46
Too Hot BAT Discharge
200 _{VNTC < VTOO_HOT}
180 V_BUS = 0V
160
140
120
100
80
60
40
20
0
3.8
3.9
4.0
4.1
4.2
V_BAT (V)
357734 G49
LED Boost Switch Impedance
vs Temperature
400
350
300
250
200
150
100
50
0
–40 –20 0
3V
3.6V
4.2V
4.8V
5.5V
20 40 60 80 100 120 140
TEMPERATURE (°C)
357734 G44
LED Boost Maximum Duty Cycle
vs Temperature
96.6
96.5
96.4
96.3
96.2
96.1
96.0
95.9
95.8
95.7
–50
3V
3.6V
4.2V
5.5V
–25 0 25 50 75
TEMPERATURE (°C)
100 125
357734 G45
10-LED Driver Efficiency
90
LDO Load Step
80
70
60
MAX PWM
CONSTANT
50
CURRENT
40
LDO1
50mV/DIV
(AC)
LDO2
20mV/DIV
(AC)
30
20
10
0
1000
100 10
1
0.1
LED CURRENT (mA)
100mA
I_{OUT1 5mA}
LDO1 = 1.2V
20μs/DIV
LDO2 = 2.5V
I_LDO2 = 40mA
0.01
V_OUT = V_BAT = 3.8V
357734 G47
357734 G48
Battery Discharge
vs Temperature
200
175
V_BUS = 5V
150
125
V_BUS = 0V
100
75
50 _{VBAT = 4.1V}
V_NTC < V_{TOO_HOT}
25 _{5x MODE}
I_VOUT = 0mA
0
50 60 70 80
90 100 110 120
TEMPERATURE (°C)
357734 G50
Input and Battery Current
vs Output Current
600 _{RPROG = 2k}
500 ^{RCLPROG = 2k}
I_IN
400
I_LOAD
300
200
I_BAT
(CHARGING)
100
0
I_BAT
WALL = 0V
(DISCHARGING)
–100
0 100 200 300 400 500 600
I_OUT (mA)
357734 G51
357734fb
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