Datasheet
LTC4155
9
4155fc
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Regulator Efficiency
Battery Charger Total Effi ciency
vs Battery Voltage
Battery and V
BUS
Currents
vs V
OUT
Current
Battery and V
BUS
Currents
vs V
OUT
Current
Battery Drain Current
vs Temperature
V
OUT
CURRENT (A)
0
CURRENT (A)
0.2
0.4
0.6
0.8
4155 G01
0
–0.2
–0.4
0.2
0.4
0.6
1.0
INPUT CURRENT
CHARGE CURRENT
500mA INPUT CURRENT LIMIT MODE
V
OUT
CURRENT (A)
0
–2
CURRENT (A)
–1
0
1
2
3
4
I
BUS
I
CHG
1234
4155 G02
5
3A INPUT CURRENT LIMIT MODE
CURRENT (A)
EFFICIENCY (%)
POWER LOST (W)
92.5
1.5
4155 G04
85.0
80.0
0.50 1.0 2.0
INCLUDES LOSSES FROM 2w Si7938DP OVP FETS
XFL4020-102ME INDUCTOR AND Si5481DU CHARGER FET
77.5
75.0
95.0
90.0
87.5
82.5
3.5
2.0
1.0
0.5
0
4.0
3.0
2.5
1.5
2.5 3.0 3.5
EFFICIENCY
TO V
OUT
EFFICIENCY
TO BATTERY
POWER LOST
TO BATTERY
POWER LOST
TO V
OUT
BATTERY VOLTAGE (V)
2.4
0.50
LOAD CURRENT (A)
0.75
1.00
1.25
1.50
1.75
2.7
3.0 3.3 3.6
4155 G06
3.9 4.2
500mA MODE
900mA MODE
V
FLOAT
= 4.05V
USB Compliant Load Current
Available Before Discharging
Battery
500mA USB Limited Battery
Charge Current vs Battery Voltage
100mA USB Limited Battery
Charge Current vs Battery Voltage
V
OUT
Voltage vs Battery Voltage
BATTERY VOLTAGE (V)
2.4
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3.3 3.9
4155 G07
2.7 3.0
3.6 4.2
CHARGE CURRENT (A)
12.5% CHARGE
CURRENT MODE
100% CHARGE
CURRENT MODE
TEMPERATURE (°C)
–25
CURRENT (µA)
6
8
10
95
4155 G03
4
2
5
7
9
3
1
0
5
35
65
–10–40 110
20
50
80
125
SUSPEND MODE (µA)
SHIP AND STORE MODE (µA)
V
BUS
= 0V
BATTERY VOLTAGE (V)
2.4
55
EFFICIENCY (%)
60
70
75
80
3.6
100
4155 G05
65
3.0
2.7
3.9
3.3 4.2
85
90
95
12.5% CHARGE
CURRENT MODE
100% CHARGE
CURRENT MODE
I
VOUT
= 0A
M = P
BAT
/P
BUS
V
FLOAT
= 4.2V
INCLUDES LOSSES FROM 2w Si7938DP OVP FETS
XFL4020-102ME INDUCTOR AND Si5481DU CHARGER FET
BATTERY VOLTAGE (V)
2.4
0
CHARGE CURRENT (mA)
20
40
60
80
100
2.7
3.0 3.3 3.6
4155 G08
3.9 4.2
V
FLOAT
= 4.2V
BATTERY VOLTAGE (V)
2.4
3.4
V
OUT
VOLTAGE (V)
3.6
3.5
3.8
3.7
4.0
3.9
4.2
4.1
4.4
4.3
2.7
3.0 3.3 3.6
4155 G09
3.9 4.2
I
VOUT
= 0A, V
FLOAT
= 4.2V
100% CHARGE
CURRENT MODE
50% CHARGE
CURRENT MODE
12.5% CHARGE
CURRENT MODE
CHARGER DISABLED
T
A
= 25°C (Note 2). V
BUS
= 5V, BATSNS = 3.7V,
DVCC = 3.3V, R
CLPROG1
= R
CLPROG2
= 1.21k, R
PROG
= 499Ω, unless otherwise noted.