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MAX8677CETG/V+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
General Description
The MAX8677C is an integrated 1-cell Li+ charger and
Smart Power Selector™ with dual (DC and USB) power
inputs. It can operate with either separate inputs for
USB and AC adapter power*, or from a single input that
accepts both. All power switches for charging and
switching the load between battery and external power
are included on-chip. No external MOSFETs are
required.
The MAX8677C features a Smart Power Selector to
make the best use of limited USB or adapter power.
The battery charge current and input current limit are
independently set up to 1.5A and 2A, respectively.
Input power not used by the system charges the bat-
tery. USB input current can be set to 100mA or 500mA.
Automatic input selection switches the system load
from battery to external power.
Other features include overvoltage protection (OVP),
charge status and fault outputs, power-OK monitors,
charge timer, and battery thermistor monitor.
Additionally, on-chip thermal limiting reduces the battery
charge rate to prevent overheating. The MAX8677C is
available in a 4mm x 4mm, 24-pin TQFN-EP package.
Applications
PDAs, Palmtops, and Wireless Handhelds
Smart Cell Phones
Portable Media/MP3 Players
GPS Navigation
Digital Cameras
Features
o Complete Charger and Smart Power Selector
o No External MOSFETs Required
o Common or Separate USB and Adapter Inputs
o System Operates with Discharged or No Battery
o Automatic Adapter/USB/Battery Switchover
o Load Peaks Over Adapter Rating Are Supported
by Battery
o Input Overvoltage Protection to 16V
o 40mΩ System-to-Battery Switch
o Thermal Regulation Prevents Overheating
o PREQ, CHG, DOK, UOK, and FLT Indicators
o 4.35V (typ) SYS Regulation Voltage
MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
________________________________________________________________
Maxim Integrated Products
1
MAX8677C
24
23
22
21
20
19
FLT
UOK
DOK
SYS
SYS
CHG
18 17 16 15 14 13
12
TQFN
(4mm x 4mm x 0.8mm)
3456
7
8
9
10
11
12
PSET
VL
GND
CT
ISET
THM
USUS
TSET
USB
USB
BAT
BAT
PEN2
PEN1
CEN
DC
DC
PREQ
Pin Configuration
Ordering Information
Q1
AC
ADAPTER
CHARGE AND
SYS LOAD
SWITCH
CHARGE
CURRENT
LOAD
CURRENT
USB
USB
BAT
SYS
GND
DC
Q2
Q3
BATTERY
SYSTEM
LOAD
MAX8677C
Typical Operating Circuit
19-0781; Rev 0; 4/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead-free package.
**
EP = Exposed paddle.
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX8677CETG+ -40°C to +85°C
24 TQFN-EP**
(4mm x 4mm)
T2444-4
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
*
Protected by U.S. Patent #6,507,172.
MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DC
= 5V, THM = CEN = USUS = GND, V
BAT
= 4V, V
PEN1
= V
PEN2
= 5V, USB, TSET, PREQ, CHG, DOK, UOK, FLT are unconnected,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC, PEN1 to GND .................................................-0.3V to +16V
USB to GND .............................................................-0.3V to +9V
VL to GND ................................................................-0.3V to +4V
BAT, SYS, CEN, USUS, PEN2, TSET to GND...........-0.3V to +6V
THM, PSET, ISET, CT to GND .........................-0.3V to VL + 0.3V
PREQ, CHG, DOK, UOK, FLT to GND .....................-0.3V to +6V
EP (exposed paddle) to GND ...............................-0.3V to +0.3V
DC Continuous Current (total in 2 pins) .........................2.4A
RMS
SYS Continuous Current (total in 2 pins) ........................2.4A
RMS
USB Continuous Current (total in 2 pins) .......................2.0A
RMS
BAT Continuous Current (total in 2 pins)........................2.4A
RMS
Continuous Power Dissipation (T
A
= +70°C)
(derate 27.8mW/°C above +70°C)........................... 2222mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature Range ............................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
DC-TO-SYS PREREGULATOR
DC Operating Range 4.1 6.6 V
DC Standoff Voltage V
BAT
= V
SYS
= 0V 14 V
DC Undervoltage Threshold W hen V
DOK
g oes l ow , V
D C
r i si ng , 500m V typ i cal hyster esi s 3.95 4.0 4.05 V
DC Overvoltage Threshold W hen V
DOK
g oes hi g h, V
D C
r i si ng , 360m V typ i cal hyster esi s 6.8 6.9 7.0 V
I
SYS
= I
BAT
= 0mA, V
CEN
= 0V 1 2
DC Supply Current
I
SYS
= I
BAT
= 0mA, V
CEN
= 5V 0.8 1.5
mA
DC Shutdown Current V
DC
= V
CEN
= USUS = 5V, V
PEN1
= 0V 195 333 µA
DC-to-SYS On-Resistance I
SYS
= 400mA, V
CEN
= 5V 0.2 0.35 Ω
DC-to-BAT Dropout Voltage
When SYS regulation and charging stops, V
DC
falling,
150mV hysteresis
10 50 90 mV
R
PSET
= 1.5kΩ 1800 2000 2200
R
PSET
= 3kΩ 900 1000 1100
R
PSET
= 6.3kΩ 450 475 500
V
PEN1
= 0V, V
PEN2
= 5V
(500mA USB mode)
450 475 500
DC Current Limit
(See Table 2 for Input Source
Control)
V
DC
= 6V, V
SYS
= 5V,
T
A
= +25°C
V
PEN1
= 0V, V
PEN2
= 0V
(100mA USB mode)
80 95 100
mA
PSET Resistance Range 1.5 6.3 kΩ
SYS Regulation Voltage V
DC
= 6V, I
SYS
= 1mA to 1.75A, V
CEN
= 5V 4.29 4.35 4.40 V
Connecting DC when no USB present 1.5 ms
Input Current Soft-Start Time
Connecting DC with USB present 50 µs
Thermal-Limit Temperature
Die temperature at which charging and input current limits
are reduced
+100 °C
Thermal-Limit Gain I
SYS
reduction/die temperature (above +100°C) 5 %/°C
VL Voltage I
VL
= 0 to 10mA 3.0 3.3 3.6 V
MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
_______________________________________________________________________________________ 3
PARAMETER CONDITIONS MIN TYP MAX UNITS
USB-TO-SYS PREREGULATOR
USB Operating Range 4.1 6.6 V
USB Standoff Voltage V
BAT
= V
SYS
= 0V 8 V
USB Undervoltage Threshold When V
UOK
goes low, V
USB
rising, 500mV hysteresis 3.95 4.0 4.05 V
USB Overvoltage Threshold When V
UOK
goes high, V
USB
rising, 100mV hysteresis 6.8 6.9 7.0 V
I
SYS
= I
BAT
= 0mA, V
CEN
= 0V, V
PEN2
= 0V 1 2
USB Supply Current
I
SYS
= I
BAT
= 0mA, V
CEN
= 5V, V
PEN2
= 0V 0.9 1.5
mA
USB Shutdown Current DC = unconnected, V
USB
= V
CEN
= V
USUS
= 5V 190 333 µA
USB-to-SYS On-Resistance DC = unconnected, V
USB
= V
CEN
= 5V, I
SYS
= 400mA 0.2 0.31 Ω
USB-to-BAT Drop-Out Voltage
When SYS regulation and charging stops, V
USB
falling,
250mV hysteresis
10 50 90 mV
V
PEN1
= 0V,
V
PEN2
= 5V
450 475 500
USB Current Limit
(See Table 2 for Input Source
Control)
DC = unconnected,
V
USB
= 5V,
T
A
= +25°C
V
PEN1
= 0V,
V
PEN2
= 0V
80 95 100
mA
SYS Regulation Voltage
DC = unconnected, V
USB
= 6V;
I
SYS
= 1mA to 400mA, V
CEN
= 5V
4.29 4.35 4.40 V
Input Limiter Soft-Start Time Input current ramp time 50 µs
Thermal-Limit Start Temperature +100 °C
Thermal-Limit Gain I
SYS
reduction/die temperature (above +100°C) 5 %/°C
VL Voltage DC = unconnected, V
USB
= 5V; I
VL
= 0 to 10mA 3.0 3.3 3.6 V
CHARGER
BAT-to-SYS On-Resistance V
DC
= 0V, V
BAT
= 4.2V, I
SYS
= 1A 0.04 0.08 Ω
BAT-to-SYS Reverse Regulation
Voltage
V
PEN1
= V
PEN2
= 0V, I
SYS
= 200mA 40 68 90 mV
T
A
= +25°C 4.179 4.2 4.221
BAT Regulation Voltage I
BAT
= 0mA
T
A
= 0°C to +85°C 4.158 4.2 4.242
V
BAT Recharge Threshold Change in V
BAT
from DONE to fast-charge -135 -95 -45 mV
BAT Charge-Current Set Range R
ISET
= 10kΩ to 2kΩ (Note 2) 0.3 1.5 A
R
ISET
= 2.4kΩ 1125 1250 1375
R
ISET
= 4kΩ 675 750 825
R
ISET
= 10kΩ 270 300 330
R
ISET
= 4kΩ, V
BAT
= 2.5V
(prequal mode)
50 75.0 100
R
ISET
= 6.2kΩ, V
BAT
= 2.5V
(prequal mode)
23 48 73
BAT Charge-Current Accuracy,
Charger Loop in Control
V
SYS
= 5.5V,
T
A
= 0°C to +85°C
R
ISET
= 10kΩ, V
BAT
= 2.5V
(prequal mode)
30
mA
ELECTRICAL CHARACTERISTICS (continued)
(V
DC
= 5V, THM = CEN = USUS = GND, V
BAT
= 4V, V
PEN1
= V
PEN2
= 5V, USB, TSET, PREQ, CHG, DOK, UOK, FLT are unconnected,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

MAX8677CETG/V+T

Mfr. #:
Buy MAX8677CETG/V+T
Manufacturer:
Maxim Integrated
Description:
Battery Management 1.5A Dual USB/AC Adapter Charge
Lifecycle:
New from this manufacturer.
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