FeaTures
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LTC3677-3
Highly Integrated
Portable Product PMIC
DescripTion
The LTC
®
3677-3 is a highly integrated power management
IC for single-cell Li-Ion/Polymer battery applications.
It includes a PowerPath manager with automatic load
prioritization, a battery charger, an ideal diode, input over-
voltage protection and numerous other internal protection
features. The LTC3677-3 is designed to accurately charge
from current limited supplies such as USB by automatically
reducing charge current such that the sum of the load
current and the charge current does not exceed the pro-
grammed input current limit (100mA or 500mA modes).
The LTC3677-3 reduces the battery voltage at elevated
temperatures to improve safety and reliability. The three
step-down switching regulators and two LDOs provide
a wide range of available supplies. The LTC3677-3 also
includes a pushbutton input to control power sequencing
and system reset. The LTC3677-3 has pushbutton tim-
ing and sequencing designed to support the SiRF Atlas
IV processor. The LTC3677-3 is available in a low profile
4mm × 7mm × 0.75mm 44-pin QFN package.
L, LT, LTC, LTM, Linear Technology, PowerPath, Burst Mode and the Linear logo are registered
trademarks and Bat-Track and Hot Swap are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6522118, 6700364, 7511390, 5481178, 6580258. Other patents pending.
Full Featured Li-Ion/Polymer Charger/PowerPath™
Controller with Instant-On Operation
Triple Adjustable High Efficiency Step-Down
Switching Regulators (800mA, 500mA, 500mA I
OUT
)
I
2
C Adjustable SW Slew Rates for EMI Reduction
High Temperature Battery Voltage Reduction
Improves Safety and Reliability
Overvoltage Protection Controller for USB (V
BUS
)/Wall
Inputs Provide Protection to 30V
1.5A Maximum Charge Current with Thermal Limiting
Battery Float Voltage: 4.2V
Pushbutton ON/OFF Control with System Reset
Dual 150mA Current Limited LDOs
Start-Up Timing Compatible with SiRF Atlas IV
Processor
Small 4mm × 7mm 44-Pin QFN Package
applicaTions
n
PNDs, DMB/DVB-H, Digital/Satellite Radio,
Media Players
n
Portable Industrial/Medical Products
n
Other USB-Based Handheld Products
Typical applicaTion
5V
ADAPTER
USB
OVERVOLTAGE
PROTECTION
CHARGE
2
High Temperature BAT Discharge
OPTIONAL
100mA/500mA
1000mA
V
OUT
0V
SINGLE-CELL
Li-Ion
0.8V to 3.6V/150mA
0.8V to 3.6V/150mA
0.8V to 3.6V/800mA
0.8V to 3.6V/500mA
0.8V to 3.6V/500mA
36773 TA01a
200
V
NTC
< V
TOO_HOT
180 V
BUS
= 0V
160
140
I
BAT
(mA)
CC/CV
CHARGER
LTC3677-3
I
2
C PORT
NTC
+
120
100
80
60
40
20
0
3.8
3.9
4.0
V
BAT
(V)
4.1
4.2
36773 TA01b
DUAL LDO
REGULATORS
TRIPLE HIGH
EFFICIENCY
STEP-DOWN
SWITCHING
REGULATORS
PB
PUSHBUTTON
CONTROL
36773f
LTC3677-3
Features ............................................................................................................................ 1
Applications ....................................................................................................................... 1
Typical Application ............................................................................................................... 1
Description......................................................................................................................... 1
Absolute Maximum Ratings ..................................................................................................... 3
Order Information ................................................................................................................. 3
Pin Configuration ................................................................................................................. 3
Electrical Characteristics ........................................................................................................ 4
Typical Performance Characteristics .........................................................................................10
Pin Functions .....................................................................................................................15
Block Diagram....................................................................................................................18
Operation..........................................................................................................................19
PowerPath OPERATION ........................................................................................................................................ 19
Low Dropout Linear Regulator Operation ............................................................................................................. 27
Step-Down Switching Regulator Operation .......................................................................................................... 28
.
2
C Operation ........................................................................................................................................................ 32
I
Pushbutton Interface Operation ............................................................................................................................ 36
Layout and Thermal Considerations ..................................................................................................................... 40
Typical Application ..............................................................................................................42
Package Description ............................................................................................................43
Typical Application ..............................................................................................................44
Related Parts .....................................................................................................................44
Table oF conTenTs
36773f
LTC3677-3
absoluTe MaxiMuM raTings
(Notes 1, 2, 3)
pin conFiguraTion
TOP VIEW
44
CHRG
43 CLPROG
42
EXTPWR
41
ACPR
40 V
BUS
39 V
OUT
38 BAT
I
LIM0
1
I
LIM1
2
NC 3
WALL 4
SW3 5
V
IN3
6
FB3 7
OVSENS 8
NC 9
DV
CC
10
SDA 11
SCL 12
OVGATE 13
PWR_ON 14
ON
15
45
GND
37 IDGATE
36 PROG
35 NTC
34 NTCBIAS
33 SW1
32 V
IN12
31 SW2
30 V
INLD02
29 LDO2
28 LDO1
27 V
INLDO1
26 FB1
25 FB2
24 LDO2_FB
23 LDO1_FB
UFF PACKAGE
44-LEAD (7mm 4mm) PLASTIC QFN
T
JMAX
= 110°C, θ
JA
= 45°C/W
EXPOSED PAD (PIN 45) IS GND, MUST BE SOLDERED TO PCB
PBSTAT 16
EN3 17
NC 18
NC 19
NC 20
PGOOD 21
NC 22
V
BUS
, V
OUT
, V
IN12
, V
IN3
, V
INLDO1
, V
INLDO2
, WALL
t < 1ms and Duty Cycle < 1% .................. –0.3V to 7V
.
Steady State ............................................ –0.3V to 6V
CHRG, BAT, PWR_ON, EXTPWR, PBSTAT, PGOOD,
FB1, FB2, FB3, LDO1, LDO1_FB, LDO2,
LDO2_FB, DV
CC
, SCL, SDA, EN3 ................. –0.3V to 6V
NTC, PROG, CLPROG, ON, I
LIM0
, I
LIM1
(Note 4) .......................................... –0.3V to V
CC
+ 0.3V
.
I
VBUS
, I
VOUT
, I
BAT
, Continuous (Note 16) .....................2A
I
SW3
, Continuous (Note 16) ................................ 850mA
.
I
SW2
, I
SW1
, Continuous (Note 16) ....................... 600mA
.
I
LDO1
, I
LDO2
, Continuous (Note 16) ..................... 200mA
I
CHRG
, I
ACPR
, I
EXTPWR
, I
PBSTAT
, I
PGOOD
..................75mA
.
I
OVSENS
..................................................................10mA
I
CLPROG
, I
PROG
.........................................................2mA
Operating Junction Temperature Range
(Note 2) ...............................................–40°C to 85°C
Maximum Junction Temperature ...........................110°C
Storage Temperature Range .................. –65°C to 125°C
orDer inForMaTion
LEAD FREE FINISH
LTC3677EUFF-3#PBF
TAPE AND REEL
LTC3677EUFF-3#TRPBF
PART MARKING
36773
PACKAGE DESCRIPTION
44-Lead (4mm × 7mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
36773f
LTC3677-3
elecTrical characTerisTics
SYMBOL
V
BUS
I
BUS_LIM
I
BUSQ
h
CLPROG
V
CLPROG
V
UVLO
V
DUVLO
R
ON_ILIM
Battery Charger
V
FLOAT
I
CHG
I
BATQ_OFF
I
BATQ_ON
V
PROG,CHG
V
PROG,TRKL
h
PROG
I
TRKL
V
TRKL
∆V
RECHRG
t
TERM
t
BADBAT
h
C/10
R
ON_CHG
T
LIM
V
BAT
Regulated Output Voltage
LTC3677-3
LTC3677-3, 0 ≤ T
J
≤ 85°C
l
l
l
full operating junction temperature range, otherwise specifications are at T
J
= 25°C. V
BUS
= 5V, V
BAT
= 3.8V, I
LIM0
= I
LIM1
= 5V,
WALL = 0V, V
INLDO2
= V
INLOD1
= V
IN12
= V
IN3
= V
OUT
, R
PROG
= 2k, R
CLPROG
= 2.1k, unless otherwise noted.
PARAMETER
Input Supply Voltage
Total Input Current (Note 5)
I
LIM0
= 5V, I
LIM1
= 5V (1x Mode)
I
LIM0
= 0V, I
LIM1
= 0V (5x Mode)
I
LIM0
= 0V, I
LIM1
= 5V (10x Mode)
1x, 5x, 10x Modes
I
LIM0
= 5V, I
LIM1
= 0V (Suspend Mode)
l
l
l
Power Manager
. The
l
denotes the specifications which apply over the
MIN
4.35
80
450
900
90
475
950
0.42
0.05
1000
TYP
MAX
5.5
100
500
1000
0.1
UNITS
V
mA
mA
mA
mA
mA
mA/mA
V
V
V
3.9
100
V
V
mV
mV
mΩ
CONDITIONS
Input Power Supply
Input Quiescent Current, POFF State
Ratio of Measured V
BUS
Current to
CLPROG Program Current
CLPROG Servo Voltage in Current
Limit
V
BUS
Undervoltage Lockout
1x Mode
5x Mode
10x Mode
Rising Threshold
Falling Threshold
3.5
0.2
1.0
2.0
3.8
3.7
50
–50
200
V
BUS
to V
OUT
Differential Undervoltage Rising Threshold
Lockout
Falling Threshold
Input Current Limit Power FET
On-Resistance (Between V
BUS
and V
OUT
)
4.179
4.165
950
465
180
4.200
4.200
1000
500
200
6
55
130
1.000
0.100
1000
4.221
4.235
1050
535
220
27
100
200
V
V
mA
mA
mA
µA
µA
µA
V
V
mA/mA
Constant-Current Mode Charge Current R
PROG
= 1k, Input Current Limit = 2A
IC Not in Thermal Limit
R
PROG
= 2k, Input Current Limit = 1A
R
PROG
= 5k, Input Current Limit = 0.4A
Battery-Drain Current, POFF State,
Buck3 Disabled, No Load (Note 14)
Battery-Drain Current, PON State,
Buck3 Enabled (Notes 10, 14)
PROG Pin Servo Voltage
PROG Pin Servo Voltage in Trickle
Charge
Ratio of I
BAT
to PROG Pin Current
Trickle Charge Current
Trickle Charge Rising Threshold
Trickle Charge Falling Threshold
Recharge Battery Threshold Voltage
Safety Timer Termination Period
Bad Battery Termination Time
Battery Charger Power FET
On-Resistance (Between V
OUT
and BAT)
Junction Temperature in Constant-
Temperature Mode
V
BAT
< V
TRKL
V
BAT
Rising
V
BAT
Falling
Threshold Voltage Relative to V
FLOAT
Timer Starts when V
BAT
= V
FLOAT
– 50mV
V
BAT
< V
TRKL
V
BAT
= 4.3V, Charger Time Out
V
BUS
= 0V
V
BUS
= 0V, I
OUT
= 0µA, No Load On
Supplies, Burst Mode
®
Operation
V
BAT
> V
TRKL
V
BAT
< V
TRKL
40
2.5
–75
3.2
0.4
0.085
50
2.9
2.75
–100
4
0.5
0.1
200
110
60
3.0
–125
4.8
0.6
0.11
mA
V
V
mV
Hour
Hour
mA/mA
mΩ
°C
End-of-Charge Indication Current Ratio (Note 6)
36773f
LTC3677-3
elecTrical characTerisTics
SYMBOL
V
COLD
V
HOT
V
TOO
_
HOT
I
NTC
I
BAT2HOT
V
BAT2HOT
Ideal Diode
V
FWD
R
DROPOUT
I
MAX
V
OVCUTOFF
V
OVGATE
I
OVSENSQ
t
RISE
V
ACPR
V
W
∆V
W
I
QWALL
Forward Voltage Detection
Diode On-Resistance, Dropout
Diode Current Limit
Overvoltage Protection Threshold
OVGATE Output Voltage
OVSENS Quiescent Current
OVGATE Time to Reach Regulation
ACPR Pin Output High Voltage
ACPR Pin Output Low Voltage
Absolute Wall Input Threshold Voltage
Differential Wall Input Threshold
Voltage
Wall Operating Quiescent Current
I
OUT
= 10mA
I
OUT
= 200mA
(Note 7)
Rising Threshold, R
OVSENS
= 6.2k
Input Below V
OVCUTOFF
Input Above V
OVCUTOFF
V
OVSENS
= 5V
C
OVGATE
= 1nF
I
ACPR
= 0.1mA
I
ACPR
= 1mA
V
WALL
Rising
V
WALL
Falling
V
WALL
– V
BAT
Falling
V
WALL
– V
BAT
Rising
I
WALL
+ I
VOUT
, I
BAT
= 0mA,
WALL = V
OUT
= 5V
I
LIM0
, I
LIM1
I
LIM0
, I
LIM1
I
LIM0
, I
LIM1
; V
PIN
= 1V
I
CHRG
= 10mA
V
BAT
= 4.5V, V
CHRG
= 5V
1.2
2
0.15
0
0.4
1
V
OUT
– 0.3
3.1
0
6.10
5
15
200
3.6
6.35
1.88 • V
OVSENS
0
40
2.5
V
OUT
0
4.3
3.2
25
75
440
0.3
4.45
100
6.70
12
25
mV
mΩ
A
V
V
V
µA
ms
V
V
V
V
mV
mV
µA
PARAMETER
Cold Temperature Fault Threshold
Voltage
Hot Temperature Fault Threshold
Voltage
NTC Discharge Threshold Voltage
NTC Leakage Current
BAT Discharge Current
BAT Discharge Threshold
NTC, Battery Discharge Protection
Rising NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
Falling NTC Voltage
Hysteresis
V
NTC
= V
BUS
= 5V
V
BAT
= 4.1V, NTC < V
TOO_HOT
I
BAT
< 0.1mA, NTC < V
TOO_HOT
75
34
24.5
–50
170
3.9
76
1.3
35
1.3
25.5
50
77
36
26.5
50
%V
NTCBIAS
%V
NTCBIAS
%V
NTCBIAS
%V
NTCBIAS
%V
NTCBIAS
mV
nA
mA
V
full operating junction temperature range, otherwise specifications are at T
J
= 25°C. V
BUS
= 5V, V
BAT
= 3.8V, I
LIM0
= I
LIM1
= 5V,
WALL = 0V, V
INLDO2
= V
INLOD1
= V
IN12
= V
IN3
= V
OUT
, R
PROG
= 2k, R
CLPROG
= 2.1k, unless otherwise noted.
CONDITIONS
MIN
TYP
MAX
Power Manager
. The
l
denotes the specifications which apply over the
UNITS
Overvoltage Protection
Wall Adapter and High Voltage Buck Output Control
Logic (I
LIM0
, I
LIM1
and
CHRG)
V
IL
V
IH
I
PD
V
CHRG
I
CHRG
Input Low Voltage
Input High Voltage
Static Pull-Down Current
CHRG Pin Output Low Voltage
CHRG Pin Input Current
0.4
V
V
µA
V
µA
36773f
微控制器 MCU
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