MAX8934GETI+ Maxim Integrated Products, MAX8934GETI+ Datasheet

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MAX8934GETI+

Manufacturer Part Number
MAX8934GETI+
Description
IC LI BATT CHARGER DUAL 28TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8934GETIT.pdf (29 pages)

Specifications of MAX8934GETI+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-5296; Rev 0; 6/10
The MAX8934G dual-input Li+/Li-Poly linear battery char-
ger with Smart Power SelectorK safely charges a single
Li+/Li-Poly cell in accordance with JEITA* recommenda-
tions. The MAX8934G monitors the battery temperature
(T
fast-charge current and charge termination voltage as the
battery temperature varies. The MAX8934G also monitors
the battery temperature while the battery is discharging,
and provides a warning flag (OT) to the system in the
event that the battery is over temperature. Safety region
2 is supported (see Figure 6 for details). An ultra-low I
always-on LDO provides an additional 3.3V supply for
system power.
The MAX8934G operates 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 MAX8934G features a Smart Power Selector to make
the best use of limited USB or adapter power. Input cur-
rent limit and battery charge current limit are indepen-
dently set. Input power not used by the system charges
the battery. Charge current limit and DC current limit can
be set up to 1.5A and 2A, respectively, while USB input
current can be set to 100mA or 500mA. Automatic input
selection switches the system load from battery to external
power.
The MAX8934G provides a SYS output voltage of 4.35V.
Other features include overvoltage protection (OVP),
open-drain charge status and fault outputs, power-OK
monitors, charge timers, and a battery thermistor moni-
tor. Additionally, on-chip thermal limiting reduces the
battery charge-rate to prevent charger overheating.
The MAX8934G is available in a 28-pin, 4mm x 4mm,
TQFN package.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
*JEITA (Japan Electronics and Information Technology
Industries Association) Standard, A Guide to the Safe Use of
Secondary Lithium Ion Batteries on Notebook–Type Personal
Computers, April 20, 2007.
BATT
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
) while charging, and automatically adjusts the
PDAs, Palmtop, and Wireless Handhelds
Portable Media, MP3 Players, and PNDs
Digital Still Cameras and Digital Video Cameras
Handheld Game Systems
_______________________________________________________________ Maxim Integrated Products 1
General Description
Applications
Q
,
S Li+ Charger with Smart Power Selector, No
S Monitors Battery Temperature and Adjusts Charge
S OT Flags System of a Hot Battery During
S Ultra-Low I
S Common or Separate USB and Adapter Inputs
S Automatic Adapter/USB/Battery Switchover
S Load Peaks in Excess of Adapter Rating are
S Input OVP to 16V (DC) and 9V (USB)
S 40mI SYS-to-BATT Switch
S Thermal Regulation Prevents Overheating
S 4.35V SYS Regulation Voltage
+Denotes a lead(Pb)-free/RoHS-compliant package.
**EP = Exposed pad.
MAX8934GETI+
External MOSFETs Needed
Current and Termination Voltage Automatically
per JEITA Recommendations
Discharge
Supported by Battery
ADAPTER
PART
USB
AC
Q
DC
USB
Typical Operating Circuit
, Always-On 3.3V LDO
Q1
Q2
-40NC to +85NC
TEMP RANGE
Ordering Information
MAX8934G
3.3V ALWAYS-ON
CURRENT
CHARGE
REGULATOR
SYS LOAD
CHARGE
SWITCH
LINEAR
AND
Q3
LOAD
CURRENT
PIN-PACKAGE
28 Thin QFN-EP**
BATT
LDO
GND
SYS
Features
SYSTEM
BATTERY
LOAD

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MAX8934GETI+ Summary of contents

Page 1

... S Load Peaks in Excess of Adapter Rating are Supported by Battery S Input OVP to 16V (DC) and 9V (USB) S 40mI SYS-to-BATT Switch S Thermal Regulation Prevents Overheating S 4.35V SYS Regulation Voltage Ordering Information PART TEMP RANGE MAX8934GETI+ -40NC to +85NC +Denotes a lead(Pb)-free/RoHS-compliant package. **EP = Exposed pad. Typical Operating Circuit 3.3V ALWAYS-ON LINEAR REGULATOR AC ...

Page 2

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ABSOLUTE MAXIMUM RATINGS DC, PEN1 to GND .................................................-0.3V to +16V USB to GND ............................................................-0. GND ...............................................................-0.3V to +4V L LDO to GND ......... -0.3V to ...

Page 3

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued 5V, CEN = USUS = THMEN = GND PEN1 PEN2 UOK, FLT are unconnected 0.068FF, T ...

Page 4

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued 5V, CEN = USUS = THMEN = GND PEN1 PEN2 UOK, FLT are unconnected 0.068FF, T ...

Page 5

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued 5V, CEN = USUS = THMEN = GND PEN1 PEN2 UOK, FLT are unconnected 0.068FF, T ...

Page 6

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring (T = +25NC, circuit of Figure 6V indicates charging.) USB OPERATING SUPPLY CURRENT vs. USB VOLTAGE (CHARGER ENABLED) 1200 V = 4.2V, BATT ...

Page 7

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring (T = +25NC, circuit of Figure 6V indicates charging.) NORMALIZED CHARGE CURRENT vs. AMBIENT TEMPERATURE (LOW IC POWER DISSIPATION) 1.0100 V = 5V, ...

Page 8

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring (T = +25NC, circuit of Figure 6V indicates charging.) SYS OUTPUT VOLTAGE vs. SYS OUTPUT CURRENT (USB) 5 4.0V, 5.3 BATT ...

Page 9

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring (T = +25NC, circuit of Figure 6V indicates charging.) DC DISCONNECT WITH NO USB (R = 22I) SYS MAX8934G toc21 V BATT 3.6V ...

Page 10

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring (T = +25NC, circuit of Figure 6V indicates charging.) LDO STARTUP WAVEFORMS LDO 3.6V V BATT 3.3V V LDO I ...

Page 11

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring (T = +25NC, circuit of Figure 6V indicates charging.) THM NORMAL TO THM HOT (> T3) TRANSITION V THM 1.0V 4.2V V BATT ...

Page 12

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring PIN NAME Charge Complete Output. The DONE active-low, open-drain output pulls low when the charger enters 1 DONE the DONE state. The charger current = 0mA when DONE is ...

Page 13

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring PIN NAME Always-On Linear Regulator Output. LDO is the output of an internal always-on 3.3V LDO that provides power to external circuitry. The LDO output provides up to 30mA ...

Page 14

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring DC POWER MANAGEMENT DC DC PWR OK CURRENT- LIMITED VOLTAGE DOK REGULATOR SET INPUT LIMIT V V LDO FOR POWER USB POWER MANAGEMENT USB PWR OK ...

Page 15

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring R PU 1MI CHARGE DONE ADAPTER C DC 10FF OFF CHARGE ON 500mA 100mA R PSET 1.5kI R ISET 3kI C VL 0.1FF 0.068FF THMSW ...

Page 16

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring R PU 1MI 5-PIN USB CHARGE CONNECTOR DONE 1 VBUS 10FF GND OFF CHARGE ON DC USB 500mA 100mA R ...

Page 17

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Table 1. External Components List for Figures 2 and 3 COMPONENT (Figures 2 and filter capacitor DC C USB filter capacitor USB ...

Page 18

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Smart Power Selector The MAX8934G Smart Power Selector seamlessly dis- tributes power among the external inputs, the battery, and the system load (see the Typical Operating Circuit). The basic ...

Page 19

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring limiter power loss is (V – SYS may be as high as 4.35V. The input limiter power loss is not less than 0. ...

Page 20

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring To prevent input transients that can cause instability in the USB or AC adapter power source, the rate of change of input current and charge current is limited. When ...

Page 21

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring MONITORING THE BATTERY CHARGE CURRENT WITH V 1.5 V ISET 0 DISCHARGING 0 BATTERY CHARGING CURRENT (A) Figure 4. Monitoring the Battery Charge Current with V ISET fast-charge current ...

Page 22

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring +25NC). Any thermistor resistance can be used as long as the value equivalent to the thermistor’s THMSW +25NC resistance. The MAX8934G THM thresholds are optimized for ...

Page 23

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring LDO CHG CHG CHARGER CONTROL OT THERMISTOR MONITOR Figure 5. Thermistor Monitor Details ______________________________________________________________________________________ SYS LOW-I , ALWAYS-ON 3.3V LDO Q TRACKS SYS WHEN DC AND USB ARE NOT ...

Page 24

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Figure 6. Safety Region 2: Fast-Charge Currents and Charge Termination Voltages 24 _____________________________________________________________________________________ 4.2 4.1 4.075 4 TEMPERATURE (NC ...

Page 25

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring STATE DIAGRAM IS FOR 10NC < TEMP < +45NC, OUTSIDE OF THIS RANGE SEE FIGURE 6 V < 2.82V BATT RESET TIMER (PQ, FC, TOP-OFF) ANY CHARGING STATE V ...

Page 26

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Chip Information PROCESS: BiCMOS 26 _____________________________________________________________________________________ Pin Configuration TOP VIEW CHG 22 SYS 23 24 SYS MAX8934G DOK 27 UOK ...

Page 27

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings ...

Page 28

Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings ...

Page 29

... 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 2010 Maxim Integrated Products © ...

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