Datasheet

LTC4088
3
4088fb
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BUS
= 5V, BAT = 3.8V, R
CLPROG
= 2.94k, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
OUT
V
OUT
Current Available Before
Discharging Battery
1x Mode, BAT = 3.3V
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Low Power Suspend Mode
High Power Suspend Mode
0.26
1.6
135
672
1251
0.32
2.04
0.41
2.46
mA
mA
mA
mA
mA
V
CLPROG
CLPROG Servo Voltage in Current Limit 1x, 5x, 10x Modes
Suspend Modes
1.188
100
V
mV
V
UVLO
V
BUS
Undervoltage Lockout Rising Threshold
Falling Threshold 3.95
4.30
4.00
4.35 V
V
V
DUVLO
V
BUS
to BAT Differential Undervoltage
Lockout
Rising Threshold
Falling Threshold
200
50
mV
mV
V
OUT
V
OUT
Voltage 1x, 5x, 10x Modes, 0V < BAT ≤ 4.2V,
I
OUT
= 0mA, Battery Charger Off
3.5 BAT + 0.3 4.7 V
USB Suspend Modes, I
OUT
= 250µA 4.5 4.6 4.7 V
f
OSC
Switching Frequency 1.8 2.25 2.7 MHz
R
PMOS
PMOS On Resistance 0.18 Ω
R
NMOS
NMOS On Resistance 0.30 Ω
I
PEAK
Peak Inductor Current Clamp 1x, 5x Modes
10x Mode
2
3
A
A
R
SUSP
Suspend LDO Output Resistance 15 Ω
Battery Charger
V
FLOAT
BAT Regulated Output Voltage
0°C ≤ T
A
≤ 85°C
4.179
4.165
4.200
4.200
4.221
4.235
V
V
I
CHG
Constant-Current Mode Charge Current R
PROG
= 1k
R
PROG
= 5k
980
192
1030
206
1080
220
mA
mA
I
BAT
Battery Drain Current V
BUS
> V
UVLO
, PowerPath Switching
Regulator On, Battery Charger Off,
I
OUT
= 0µA
3.5 5 µA
V
BUS
= 0V, I
OUT
= 0µA (Ideal Diode Mode) 23 35 µA
V
PROG
PROG Pin Servo Voltage 1.000 V
V
PROG,TRKL
PROG Pin Servo Voltage in Trickle
Charge
BAT < V
TRKL
0.100 V
h
PROG
Ratio of I
BAT
to PROG Pin Current 1031 mA/mA
V
TRKL
Trickle Charge Threshold Voltage BAT Rising 2.7 2.85 3.0 V
ΔV
TRKL
Trickle Charge Hysteresis Voltage 135 mV
V
RECHRG
Recharge Battery Threshold Voltage Threshold Voltage Relative to V
FLOAT
–80 –100 –120 mV
t
TERM
Safety Timer Termination Period Timer Starts when V
BAT
= V
FLOAT
3.2 4.0 4.8 Hour
t
BADBAT
Bad Battery Termination Time BAT < V
TRKL
0.4 0.5 0.6 Hour
I
C/X
Battery Charge Current at Programmed
End of Charge Indication
R
C/X
= 1k
R
C/X
= 5k
85 100
20
115 mA
mA
V
C/X
C/X Threshold Voltage 100 mV
h
C/X
Battery Charge Current Ratio to C/X 1031 mA/mA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA 65 100 mV
I
CHRG
CHRG Pin Input Current BAT = 4.5V, V
CHRG
= 5V 0 1 µA