Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po TQFN 28 (4x4) Surface-mount

Dual-Input Linear Charger, Smart Power Selector

with Advanced Battery Temperature Monitoring

MAX8934G

General Description

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

BATT

) while charging, and automatically adjusts the

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.

Applications

PDAs, Palmtop, and Wireless Handhelds

Portable Media, MP3 Players, and PNDs

Digital Still Cameras and Digital Video Cameras

Handheld Game Systems

Features

Li+ Charger with Smart Power Selector, No

External MOSFETs Needed

Monitors Battery Temperature and Adjusts Charge

Current and Termination Voltage Automatically

per JEITA Recommendations

OT Flags System of a Hot Battery During

Discharge

Ultra-Low I

, Always-On 3.3V LDO

Common or Separate USB and Adapter Inputs

Automatic Adapter/USB/Battery Switchover

Load Peaks in Excess of Adapter Rating are

Supported by Battery

Input OVP to 16V (DC) and 9V (USB)

40mI SYS-to-BATT Switch

Thermal Regulation Prevents Overheating

4.35V SYS Regulation Voltage

Typical Operating Circuit

+Denotes a lead(Pb)-free/RoHS-compliant package.

**EP = Exposed pad.

Smart Power Selector is a trademark of Maxim Integrated

Products, Inc.

Ordering Information

*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.

19-5296; Rev 0; 6/10

PART TEMP RANGE PIN-PACKAGE

MAX8934GETI+ -40NC to +85NC 28 Thin QFN-EP**

MAX8934G

SYS

LDO

GND

CHARGE

CURRENT

LOAD

CURRENT

BATT

BATTERY

SYSTEM

LOAD

ADAPTER

CHARGE

AND

SYS LOAD

SWITCH

USB

3.3V ALWAYS-ON

LINEAR

REGULATOR

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

Summary of content (29 pages)

PAGE 1
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring General Description The MAX8934G dual-input Li+/Li-Poly linear battery charger with Smart Power SelectorK safely charges a single Li+/Li-Poly cell in accordance with JEITA* recommendations. The MAX8934G monitors the battery temperature (TBATT) while charging, and automatically adjusts the fast-charge current and charge termination voltage as the battery temperature varies.
PAGE 2
MAX8934G 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.............................................................-0.3V to +9V VL to GND................................................................-0.3V to +4V LDO to GND.......... -0.3V to the lower of +4V and (VSYS + 0.3V) THMEN, THMSW to GND...................... -0.3V to +(VLDO + 0.
PAGE 3
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued) (VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK, UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 6.6 V 8 V USB-TO-SYS PREREGULATOR USB Operating Voltage Range 4.
PAGE 4
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued) (VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK, UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 5
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued) (VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK, UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 6
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Typical Operating Characteristics (TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current indicates charging.) 400 200 ENTERING OVLO 700 600 500 1 2 3 4 5 6 300 200 100 100 50 ENTERING OVLO 0 0 1 2 3 4 5 6 7 8 0 2 3 4 5 6 7 USB VOLTAGE (V) BATTERY INPUT CURRENT vs.
PAGE 7
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Typical Operating Characteristics (continued) (TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current indicates charging.) NORMALIZED CHARGE CURRENT vs. AMBIENT TEMPERATURE (LOW IC POWER DISSIPATION) 1.0050 1.0025 1.0000 0.9975 0.9950 0.9925 -15 4.210 4.205 4.200 4.195 4.190 4.185 4.180 10 35 60 85 4.
PAGE 8
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Typical Operating Characteristics (continued) (TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current indicates charging.) VL OUTPUT VOLTAGE vs. DC VOLTAGE SYS OUTPUT VOLTAGE vs. SYS OUTPUT CURRENT (USB) 3.0 4.9 0.1A, PEN1 = 0, PEN2 = 0 4.7 4.5 MAX8934G toc16 0.5A, PEN1 = 0, PEN2 = 0 4.3 4.1 3.9 2.5 2.0 IVL = 5mA 1.5 1.
PAGE 9
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Typical Operating Characteristics (continued) (TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current indicates charging.) DC DISCONNECT WITH NO USB (RSYS = 22I) MAX8934G toc21 VBATT MAX8934G toc22 5V/div 3.6V VSYS 4V 3.6V 1.2A VUSB 5V/div 475mA CSYS CHARGING IUSB 160mA VSYS 3.3V VUOK 3.3V VCHG 3.
PAGE 10
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Typical Operating Characteristics (continued) (TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current indicates charging.) LDO OUTPUT VOLTAGE vs. BATTERY VOLTAGE LDO STARTUP WAVEFORMS MAX8934G toc27 VBATT VLDO 3.0 2V/div 3.3V 2V/div 50mA/div IBATT MAX8934G toc28 3.5 3.6V LDO OUTPUT VOLTAGE (V) ILDO = 0 2.
PAGE 11
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Typical Operating Characteristics (continued) (TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current indicates charging.) THM NORMAL TO THM HOT NO CHARGE (> T4) TRANSITION THM NORMAL TO THM HOT (> T3) TRANSITION MAX8934G toc33 MAX8934G toc32 0.65V 500mV/div VTHM 1.0V 4.2V 4.2V VBATT 500mV/div VTHM 4.
PAGE 12
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Pin Description PIN NAME 1 DONE FUNCTION Charge Complete Output. The DONE active-low, open-drain output pulls low when the charger enters the DONE state. The charger current = 0mA when DONE is low. See Figure 7. DC Power Input. DC is capable of delivering up to 2A to SYS. DC supports both AC adapter and USB inputs. The DC current limit is set with PEN1, PEN2, and RPSET. See Table 2.
PAGE 13
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Pin Description (continued) PIN NAME FUNCTION 17 LDO 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 of current for indicator LEDs or other loads.
PAGE 14
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring OT LDO DC POWER MANAGEMENT DC SYS DC SYS PWR OK 3.
PAGE 15
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring TO LDO RPU 1MI RPU 4x 1MI 1 CHARGE DONE ADAPTER DONE OT MAX8934G 2 DC CDC 10FF 3 DC 5 OFF 4 CHARGE ON 500mA 6 100mA 7 DOK 8 CVL 0.1FF 9, 13 CCT 0.068FF THMSW ACTIVE DISABLED 10 15 16 14 100kI NTC 100kI 25C FAULT OUTPUT 27 USB PWR OK 26 DC PWR OK SYS 23 CEN CSYS 10FF SYS 24 PEN2 TO SYSTEM LOAD 1MI PSET CHG 11 OVERTEMPERATURE 28 PEN1 RPSET 1.
PAGE 16
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring TO LDO 5-PIN USB CONNECTOR VBUS DD+ ID GND RPU 1MI CHARGE DONE RPU 4x 1MI 1 DONE 2 DC 1 2 3 4 5 CDC 10FF MAX8934G 4 CHARGE ON DC 5 USB 500mA 6 100mA 7 DOK RISET 3kI 8 CVL 0.1FF 9, 13 CCT 0.
PAGE 17
MAX8934G 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 3) FUNCTION CDC DC filter capacitor 10FF ±10%, 16V X5R ceramic capacitor (0805) Taiyo Yuden EMK212BJ106KG CUSB USB filter capacitor 4.7FF ±10%, 10V X5R ceramic capacitor (0805) Taiyo Yuden LMK212BJ475KD CVL VL filter capacitor 0.
PAGE 18
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Smart Power Selector The MAX8934G Smart Power Selector seamlessly distributes power among the external inputs, the battery, and the system load (see the Typical Operating Circuit).
PAGE 19
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring limiter power loss is (VDC – VSYS) x IDC, where VSYS may be as high as 4.35V. The input limiter power loss is not less than 0.2I x IDC2. Also note that the MAX8934G turns off when any input exceeds 6.9V (typ). DC and USB Connections and Current-Limit Options Input Current Limit The input and charger current limits are set as shown in Table 2.
PAGE 20
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Soft-Start 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 a valid DC or USB input is connected, the input current limit is ramped from zero to the set current-limit value (as shown in Table 2). If DC is connected with no USB power present, input current ramps in 1.5ms.
PAGE 21
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring charge-termination threshold (IDONE) and the charger is in voltage mode. The charger exits the DONE state, and fast-charge resumes, if the battery voltage subsequently drops 104mV, or if input power or CEN is cycled. When the MAX8934G is used in conjunction with a FP, connect a pullup resistor between DONE and the logic I/O voltage to indicate charge status to the FP.
PAGE 22
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring +25NC). Any thermistor resistance can be used as long as the value of RTHMSW is equivalent to the thermistor’s +25NC resistance. The MAX8934G THM thresholds are optimized for a thermistor Beta of 3964. The general relation of thermistor resistance to temperature is defined by the following equation: = R T R 25 the fast-charge current, depending on the sensed battery temperature.
PAGE 23
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring SYS LOW-IQ, ALWAYS-ON 3.3V LDO TRACKS SYS WHEN DC AND USB ARE NOT PRESENT, THE BATTERY IS BEING DISCHARGED, AND VBATT P 3.3V. LDO CHG VINT CHG THMEN CHG THMSW CHARGER CONTROL RTHMSW T4 (60NC) + OT CHG THERMISTOR MONITOR THM VINT VINT VINT T3 (45NC) T + CHG VINT VINT T2 (10NC) + CHG VINT VINT TOT (75NC) + NOT CHARGING THMEN VINT VINT T1 (0NC) + CHG Figure 5.
PAGE 24
MAX8934G BATT REGULATION VOLTAGE (V) (VBATT_REG) Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring T2 0 10 T1 T2 0 10 T3 T4 4.2 4.1 4.075 4.0 C FAST-CHARGE CURRENT (ICHG) T1 25 45 60 TEMPERATURE (NC) T3 T4 45 60 85 0.5C 25 85 TEMPERATURE (NC) Figure 6.
PAGE 25
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring NOT READY UOK AND DOK = HIGH-Z CHG = HIGH-Z FLT = HIGH-Z DONE = HIGH-Z ICHG = 0mA CEN = HIGH OR REMOVE AND RECONNECT THE INPUT SOURCE(S) TOGGLE CEN OR REMOVE AND RECONNECT THE INPUT SOURCE(S) UOK OR DOK = LOW CEN = 0 RESET TIMER STATE DIAGRAM IS FOR 10NC < TEMP < +45NC, OUTSIDE OF THIS RANGE SEE FIGURE 6 ANY STATE PREQUAL UOK OR DOK = LOW CHG = LOW FLT = HIGH-Z DONE = HIGH-Z 0V P VBATT P 3V ICHG = ICH
PAGE 26
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Pin Configuration USB USB LDO THMSW THMEN TOP VIEW BATT PROCESS: BiCMOS BATT Chip Information 21 20 19 18 17 16 15 CHG 22 14 THM SYS 23 13 GND 12 USUS 11 ISET DOK 26 10 CT UOK 27 9 GND 8 VL SYS 24 MAX8934G OT 25 *EP 4 5 6 7 PEN1 PEN2 PSET DC 3 CEN 2 DC 1 DONE FLT 28 THIN QFN *EXPOSED PAD 26 Maxim Integrated
PAGE 27
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Package Information For the latest package outline information and land patterns, go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 28
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Package Information (continued) For the latest package outline information and land patterns, go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 29
MAX8934G Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring Revision History REVISION NUMBER REVISION DATE 0 6/10 DESCRIPTION DATE Initial release PAGES CHANGED — Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.