IC USB/AC ADP CHARGER 24-TQFN

MAX8677CETG+T

Manufacturer Part NumberMAX8677CETG+T
DescriptionIC USB/AC ADP CHARGER 24-TQFN
ManufacturerMaxim Integrated Products
MAX8677CETG+T datasheet
 


Specifications of MAX8677CETG+T

FunctionCharge ManagementBattery TypeLithium-Ion (Li-Ion)
Voltage - Supply4.1 V ~ 6.6 VOperating Temperature-40°C ~ 85°C
Mounting TypeSurface MountPackage / Case24-TQFN Exposed Pad
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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19-0781; Rev 0; 4/07
1.5A Dual-Input USB/AC Adapter Charger
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.
PDAs, Palmtops, and Wireless Handhelds
Smart Cell Phones
Portable Media/MP3 Players
GPS Navigation
Digital Cameras
Typical Operating Circuit
AC
MAX8677C
ADAPTER
SYS
DC
Q1
CHARGE
LOAD
CURRENT
CURRENT
USB
USB
BAT
Q3
Q2
CHARGE AND
SYS LOAD
SWITCH
GND
________________________________________________________________ Maxim Integrated Products
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.
and Smart Power Selector
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
PART
MAX8677CETG+ -40°C to +85°C
Applications
+ Denotes a lead-free package.
** EP = Exposed paddle.
CHG
SYS
SYS
DOK
UOK
SYSTEM
LOAD
BATTERY
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
* Protected by U.S. Patent #6,507,172.
Features
Ordering Information
PIN-
TEMP RANGE
PACKAGE
24 TQFN-EP**
(4mm x 4mm)
Pin Configuration
18
17
16
15
14
13
19
12
THM
20
11
ISET
21
10
CT
MAX8677C
22
9
GND
23
8
VL
FLT
24
7
PSET
1
2
3
4
5
6
TQFN
(4mm x 4mm x 0.8mm)
PKG
CODE
T2444-4
1

MAX8677CETG+T Summary of contents

  • Page 1

    ... Q3 Q2 CHARGE AND SYS LOAD SWITCH GND ________________________________________________________________ Maxim Integrated Products 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. and Smart Power Selector o Complete Charger and Smart Power Selector o No External MOSFETs Required ...

  • Page 2

    Dual-Input USB/AC Adapter Charger and Smart Power Selector ABSOLUTE MAXIMUM RATINGS DC, PEN1 to GND .................................................-0.3V to +16V USB to GND .............................................................-0. GND ................................................................-0.3V to +4V BAT, SYS, CEN, USUS, PEN2, TSET to GND...........-0.3V to ...

  • Page 3

    Dual-Input USB/AC Adapter Charger ELECTRICAL CHARACTERISTICS (continued) = 5V, THM = CEN = USUS = GND -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER USB-TO-SYS PREREGULATOR USB Operating Range ...

  • Page 4

    Dual-Input USB/AC Adapter Charger and Smart Power Selector ELECTRICAL CHARACTERISTICS (continued) = 5V, THM = CEN = USUS = GND -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER R ...

  • Page 5

    Dual-Input USB/AC Adapter Charger (T = +25°C, unless otherwise noted.) A USB QUIESCENT CURRENT vs. USB VOLTAGE (CHARGER ENABLED BAT USUS 0.9 CHARGER IN 0.8 DONE MODE 0.7 SYS ...

  • Page 6

    Dual-Input USB/AC Adapter Charger and Smart Power Selector (T = +25°C, unless otherwise noted.) A NORMALIZED CHARGE CURRENT vs. AMBIENT TEMPERATURE (LOW IC POWER DISSIPATION) 1.0100 USB BAT 1.0075 1.0050 1.0025 1.0000 0.9975 ...

  • Page 7

    Dual-Input USB/AC Adapter Charger (T = +25°C, unless otherwise noted.) A CHARGE PROFILE —1400mAh BATTERY ADAPTER INPUT—1A CHARGE 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 TIME (min) DC CONNECT WITH USB ...

  • Page 8

    Dual-Input USB/AC Adapter Charger and Smart Power Selector (T = +25°C, unless otherwise noted.) A USB DISCONNECT WITH 20Ω) SYS V USB I USB V SYS V UOK V CHG 200μs/div PIN NAME Charge Prequal ...

  • Page 9

    Dual-Input USB/AC Adapter Charger PIN NAME USB High/Low Control. PEN2 sets the DC or USB current limit to 100mA (PEN2 low) or 500mA (PEN2 high). 6 PEN2 PEN2 controls both DC and USB current limits when PEN1 is low. ...

  • Page 10

    Dual-Input USB/AC Adapter Charger and Smart Power Selector MANAGEMENT DC AC ADAPTER PWR OK DOK MANAGEMENT USB USB PWR OK UOK PEN1 DC MODE 500mA PEN2 USB 100mA USUS USB LIMIT CURRENT LIMIT SUSPEND PSET DC LIMIT Figure 1. ...

  • Page 11

    Dual-Input USB/AC Adapter Charger R PU 560kΩ 1 PREQUAL ADAPTER 4.7μF 3 OFF 4 CHARGE ON 5 500mA 6 100mA 7 R PSET 0.1μ 0.068μ ISET 12 ...

  • Page 12

    Dual-Input USB/AC Adapter Charger and Smart Power Selector MINI 5-STYLE PREQUAL CONNECTOR 1 VBUS 4.7μ OFF GND CHARGE DC-USB USB 500mA 100mA 10kΩ Figure ...

  • Page 13

    Dual-Input USB/AC Adapter Charger Table 1. External Components List for Figures 2 and 3 COMPONENT FUNCTION (FIGURES Input filter capacitor filter capacitor C SYS output bypass capacitors SYS C Battery bypass capacitor BAT ...

  • Page 14

    Dual-Input USB/AC Adapter Charger and Smart Power Selector The input voltage limiter is essentially an LDO regulator. While in dropout, the regulator dissipates a small I through the 0.2Ω MOSFET (Q1, Figure 4) between DC and SYS. With an ...

  • Page 15

    Dual-Input USB/AC Adapter Charger When the input current limit is reached, the first action taken by the MAX8677C is to reduce the battery charge current. This allows the regulator to stay in dropout 4.35V, during heavy loads, ...

  • Page 16

    Dual-Input USB/AC Adapter Charger and Smart Power Selector V < 2.8V BATT RESET TIMER ANY CHARGING STATE THM OK THM NOT OK TIMER RESUME TIMER SUSPEND TEMPERATURE SUSPEND I = 0mA CHG UOK OR DOK = PREVIOUS STATE CHG ...

  • Page 17

    Dual-Input USB/AC Adapter Charger Charge Enable ( CEN ) When CEN is low, the charger is on. When CEN is high, the charger turns off. CEN does not affect the SYS out- put. In many systems, there is no ...

  • Page 18

    Dual-Input USB/AC Adapter Charger and Smart Power Selector When the MAX8677C is used in conjunction with a µP, connect a pullup resistor between PREQ and the logic I/O voltage to indicate charge status to the µP. Alternatively, PREQ can ...

  • Page 19

    Dual-Input USB/AC Adapter Charger For a typical 10kΩ (at +25°C) thermistor and a 10kΩ R resistor, the charger enters a temperature suspend TB state when the thermistor resistance falls below 3.97kΩ (too hot) or rises above 28.7kΩ (too cold). ...

  • Page 20

    Dual-Input USB/AC Adapter Charger and Smart Power Selector (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 20 ______________________________________________________________________________________ Package Information ...

  • Page 21

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21 © 2007 Maxim Integrated Products ...