Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2).... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3555EUFD#PBF
LTC3555IUFD#PBF
LTC3555EUFD-1#PBF
LTC3555IUFD-1#PBF
LTC3555EUFD-3#PBF
LTC3555IUFD-3#PBF
TAPE AND REEL
LTC3555EUFD#TRPBF
LTC3555IUFD#TRPBF
LTC3555EUFD-1#TRPBF
LTC3555IUFD-1#TRPBF
LTC3555EUFD-3#TRPBF
LTC3555IUFD-3#TRPBF
PART MARKING*
3555
3555
35551
35551
35553
35553
PACKAGE DESCRIPTION
28-Lead (4mm x 5mm) Plastic QFN
28-Lead (4mm x 5mm) Plastic QFN
28-Lead (4mm x 5mm) Plastic QFN
28-Lead (4mm x 5mm) Plastic QFN
28-Lead (4mm x 5mm) Plastic QFN
28-Lead (4mm x 5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL
V
BUS
I
BUSLIM
PARAMETER
Input Supply Voltage
Total Input Current
PowerPath Switching Regulator
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, DV
CC
= 3.3V, R
PROG
= 1k, R
CLPROG
= 3k,
unless otherwise noted.
CONDITIONS
MIN
4.35
1x Mode, V
OUT
= BAT
5x Mode, V
OUT
= BAT
10x Mode, V
OUT
= BAT
Suspend Mode, V
OUT
= BAT
1x Mode, I
OUT
= 0mA
5x Mode, I
OUT
= 0mA
10x Mode, I
OUT
= 0mA
Suspend Mode, I
OUT
= 0mA
l
l
l
l
TYP
MAX
5.5
UNITS
V
mA
mA
mA
mA
mA
mA
mA
mA
3555fd
87
436
800
0.31
I
VBUSQ
V
BUS
Quiescent Current
95
460
860
0.38
7
15
15
0.044
100
500
1000
0.50
2
LTC3555/LTC3555-X
ELECTRICAL CHARACTERISTICS
SYMBOL
h
CLPROG
(Note 4)
PARAMETER
Ratio of Measured V
BUS
Current to
CLPROG Program Current
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, DV
CC
= 3.3V, R
PROG
= 1k, R
CLPROG
= 3k,
unless otherwise noted.
CONDITIONS
1x Mode
5x Mode
10x Mode
Suspend Mode
1x Mode, BAT = 3.3V
5x Mode, BAT = 3.3V
10x Mode, BAT = 3.3V
Suspend Mode
1x, 5x, 10x Modes
Suspend Mode
Rising Threshold
Falling Threshold
Rising Threshold
Falling Threshold
1x, 5x, 10x Modes, 0V < BAT < 4.2V,
I
OUT
= 0mA, Battery Charger Off
USB Suspend Mode, I
VOUT
= 250μA
MIN
TYP
224
1133
2140
11.3
135
672
1251
0.32
1.188
100
4.30
4.00
200
50
BAT + 0.3
4.6
2.25
0.18
0.30
1x, 5x Modes
10x
LTC3555/LTC3555-1
LTC3555/LTC3555-1
LTC3555-3
LTC3555-3
R
PROG
= 1k
R
PROG
= 5k
V
BUS
> V
UVLO
, Battery Charger Off, I
VOUT
= 0μA
V
BUS
= 0V, I
VOUT
= 0μA (Ideal Diode Mode)
LTC3555
LTC3555-1/LTC3555-3
BAT < V
TRKL
4.179
4.165
4.079
l
4.065
980
185
2
l
MAX
UNITS
mA/mA
mA/mA
mA/mA
mA/mA
mA
mA
mA
mA
V
mV
V
V
mV
mV
V
V
MHz
Ω
Ω
A
A
I
OUT(POWERPATH)
V
OUT
Current Available Before
Loading BAT
V
CLPROG
V
UVLO_VBUS
V
UVLO_VBUS-BAT
V
OUT
CLPROG Servo Voltage in Current
Limit
V
BUS
Undervoltage Lockout
V
BUS
to BAT Differential Undervoltage
Lockout
V
OUT
Voltage
4.35
3.95
3.4
4.5
1.8
4.7
4.7
2.7
f
OSC
Switching Frequency
R
PMOS_POWERPATH
PMOS On Resistance
R
NMOS_POWERPATH
NMOS On Resistance
I
PEAK_POWERPATH
Battery Charger
V
FLOAT
BAT Regulated Output Voltage
Peak Switch Current Limit
2
3
4.200
4.200
4.100
4.100
1022
204
3.5
27
32
1.000
0.100
100
1022
4.221
4.235
4.121
4.135
1065
223
5
38
44
I
CHG
I
BAT
Constant Current Mode Charge
Current
Battery Drain Current
V
V
V
V
mA
mA
μA
μA
μA
V
V
mV
mA/mA
mA
V
PROG
V
PROG_TRKL
V
C/10
h
PROG
I
TRKL
V
TRKL
ΔV
TRKL
ΔV
RECHRG
t
TERM
t
BADBAT
h
C/10
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle
Charge
C/10 Threshold Voltage at PROG
Ratio of I
BAT
to PROG Pin Current
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
Recharge Battery Threshold Voltage
Safety Timer Termination
Bad Battery Termination Time
Threshold Voltage Relative to V
FLOAT
Timer Starts when BAT = V
FLOAT
BAT < V
TRKL
–75
3.3
0.42
0.088
BAT < V
TRKL
BAT Rising
2.7
100
2.85
135
–100
4
0.5
0.1
–125
5
0.63
0.112
3.0
V
mV
mV
Hour
Hour
mA/mA
End of Charge Indication Current Ratio (Note 5)
3555fd
3
LTC3555/LTC3555-X
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CHRG
I
CHRG
R
ON_CHG
T
LIM
NTC
V
COLD
V
HOT
V
DIS
I
NTC
Ideal Diode
V
FWD
R
DROPOUT
I
MAX_DIODE
V
LDO3V3
R
CL_LDO3V3
R
OL_LDO3V3
V
IL
V
IH
I
PD1
I
2
C Port
DV
CC
I
DVCC
V
DVCC_UVLO
ADDRESS
V
IH
, SDA, SCL
V
IL
, SDA, SCL
I
PD2
SDA, SCL
V
OL
f
SCL
t
BUF
t
HD_STA
t
SU_STA
Input Supply Voltage
DV
CC
Current
DV
CC
UVLO
I
2
C Address
Input High Threshold
Input Low Threshold
Pull-Down Current
Digital Output Low (SDA)
Clock Operating Frequency
Bus Free Time Between Stop and Start
Condition
Hold Time After (Repeated) Start
Condition
Repeated Start Condition Setup Time
1.3
0.6
0.6
I
PULLUP
= 3mA
70
30
2
0.4
400
SCL/SDA = 0kHz
1.6
0.5
1.0
0001 001[0]
%DV
CC
%DV
CC
μA
V
kHz
μs
μs
μs
3555fd
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, DV
CC
= 3.3V, R
PROG
= 1k, R
CLPROG
= 3k,
unless otherwise noted.
PARAMETER
CHRG
Pin Output Low Voltage
CHRG
Pin Leakage Current
Battery Charger Power FET On
Resistance (Between V
OUT
and BAT)
Junction Temperature in Constant
Temperature Mode
Cold Temperature Fault Threshold
Voltage
Hot Temperature Fault Threshold
Voltage
NTC Disable Threshold Voltage
NTC Leakage Current
Forward Voltage
Rising Threshold
Hysteresis
Falling Threshold
Hysteresis
Falling Threshold
Hysteresis
V
NTC
= V
BUS
= 5V
75.0
33.4
0.7
–50
2
15
0.18
1.6
0mA < I
LDO3V3
< 25mA
3.1
3.3
4
23
0.4
1.2
2
3.5
CONDITIONS
I
CHRG
= 5mA
V
CHRG
= 5V
0.18
110
MIN
TYP
65
MAX
100
1
UNITS
mV
μA
Ω
°C
76.5
1.5
34.9
1.5
1.7
50
78.0
36.4
2.7
50
%V
BUS
%V
BUS
%V
BUS
%V
BUS
%V
BUS
mV
nA
mV
mV
Ω
A
V
Ω
Ω
V
V
μA
V
BUS
= 0V, I
VOUT
= 10mA
I
VOUT
= 10mA
Internal Diode On Resistance, Dropout V
BUS
= 0V
Internal Diode Current Limit
Regulated Output Voltage
Closed-Loop Output Resistance
Dropout Output Resistance
Logic Low Input Voltage
Logic High Input Voltage
I
LIM0
, I
LIM1
, EN1, EN2, EN3
Pull-Down Currents
Always On 3.3V LDO Supply
Logic (I
LIM0
, I
LIM1
, EN1, EN2, EN3)
5.5
V
μA
V
4
LTC3555/LTC3555-X
ELECTRICAL CHARACTERISTICS
SYMBOL
t
SU_STD
t
HD_DAT(OUT)
t
HD_DAT(IN)
t
SU_DAT
t
LOW
t
HIGH
t
f
t
r
t
SP
V
IN1,2,3
V
OUTUVLO
PARAMETER
Stop Condition Time
Data Hold Time
Input Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Clock Data Fall Time
Clock Data Rise Time
Spike Suppression Time
Input Supply Voltage
V
OUT
UVLO—V
OUT
Falling
V
OUT
UVLO—V
OUT
Rising
Oscillator Frequency
FBx Input Current
Maximum Duty Cycle
SWx Pull-Down in Shutdown
Pulse Skip Mode Input Current
Burst Mode Input Current
Forced Burst Mode
®
Input Current
LDO Mode Input Current
Shutdown Input Current
PMOS Switch Current Limit
Available Output Current
I
OUT1
= 0μA (Note 6)
I
OUT1
= 0μA (Note 6)
I
OUT1
= 0μA (Note 6)
I
OUT1
= 0μA (Note 6)
I
OUT1
= 0μA, FB1 = 0V
Pulse Skip/Burst Mode Operation
Pulse Skip/Burst Mode Operation (Note 7)
Forced Burst Mode Operation (Note 7)
LDO Mode (Note 7)
(Note 8)
V
FB1,2,3
= 0.85V
V
IN1,2,3
Connected to V
OUT
Through Low
Impedance. Switching Regulators are Disabled in
UVLO
2.7
2.5
2.6
2.8
2.25
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, DV
CC
= 3.3V, R
PROG
= 1k, R
CLPROG
= 3k,
unless otherwise noted.
CONDITIONS
MIN
0.6
225
0
100
1.3
0.6
20
20
300
300
50
5.5
2.9
2.7
50
10
225
35
20
20
600
400
60
50
0.78
800
900
TYP
MAX
UNITS
μs
ns
ns
ns
μs
μs
ns
ns
ns
V
V
V
MHz
nA
%
kΩ
μA
μA
μA
μA
μA
mA
mA
mA
mA
V
Ω
Ω
Ω
Ω
μA
μA
μA
μA
μA
mA
mA
mA
mA
General Purpose Switching Regulators 1, 2 and 3
f
OSC
I
FB1,2,3
D
1,2,3
R
SW1,2,3_PD
I
VIN1
1.8
–50
100
General Purpose Switching Regulator 1
60
35
35
1
1100
I
LIMSW1
I
OUT1
V
FB1
R
P1
R
N1
R
LDO_CL1
R
LDO_OL1
I
VIN2
V
FB1
Servo Voltage
PMOS R
DS(ON)
NMOS R
DS(ON)
LDO Mode Closed-Loop R
OUT
LDO Mode Open-Loop R
OUT
Pulse Skip Mode Input Current
Burst Mode Input Current
Forced Burst Mode Input Current
LDO Mode Input Current
Shutdown Input Current
PMOS Switch Current Limit
Available Output Current
l
0.80
0.6
0.7
0.25
0.82
(Note 9)
I
OUT2
= 0μA (Note 6)
I
OUT2
= 0μA (Note 6)
I
OUT2
= 0μA (Note 6)
I
OUT2
= 0μA (Note 6)
I
OUT2
= 0μA, FB2 = 0V
Pulse Skip/Burst Mode Operation
Pulse Skip/Burst Mode Operation (Note 7)
Forced Burst Mode Operation (Note 7)
LDO Mode (Note 7)
2.5
225
35
20
20
600
400
60
50
800
General Purpose Switching Regulator 2
60
35
35
1
1100
I
LIMSW2
I
OUT2
Burst Mode is a registered trademark of Linear Technology Corporation.
1. PROCESS(Clk)
VARIABLE CNT : INTEGER RANGE 0 TO 20;
BEGIN
IF (RST='1')
CNT:=0;
ELSIF CLK'EVENT AND CLK='1'
IF (Cnt=0)
Cnt:=20;
ELSE
Cnt:=Cnt-1;
END IF;
END IF ......
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