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PDF MAX8934G Data sheet ( Hoja de datos )
| Número de pieza | MAX8934G | |
| Descripción | Dual-Input Linear Charger Smart Power Selector | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-5296; Rev 0; 6/10
www.DataSheet4U.com
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
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
(TBATT) 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 IQ,
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
*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.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
Features
S Li+ Charger with Smart Power Selector, No
External MOSFETs Needed
S Monitors Battery Temperature and Adjusts Charge
Current and Termination Voltage Automatically
per JEITA Recommendations
S OT Flags System of a Hot Battery During
Discharge
S Ultra-Low IQ, Always-On 3.3V LDO
S Common or Separate USB and Adapter Inputs
S Automatic Adapter/USB/Battery Switchover
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 PIN-PACKAGE
MAX8934GETI+
-40NC to +85NC 28 Thin QFN-EP**
+Denotes a lead(Pb)-free/RoHS-compliant package.
**EP = Exposed pad.
Typical Operating Circuit
AC
ADAPTER
USB
DC Q1
USB Q2
3.3V ALWAYS-ON
LINEAR
REGULATOR
LDO
SYS
CHARGE
CURRENT
LOAD
CURRENT
Q3
CHARGE
AND
SYS LOAD
SWITCH
BATT
MAX8934G
GND
SYSTEM
LOAD
BATTERY
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
www.DataSheet4U.com
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
THERMISTOR MONITOR (Beta = 3964) (Note 2)
CONDITIONS
THM Cold No-Charge Threshold
(T1)
ICHG = 0A, when charging is suspended, 2NC hysteresis
THM Cold Threshold (T2)
VBATT_REG, reduced, 2NC hysteresis
MIN
-2.1
76.4
8.2
66.2
TYP MAX UNITS
0
77.2
10
67
+2.4
77.9
12
67.6
NC
% of
THMSW
NC
% of
THMSW
THM Hot Threshold (T3)
VBATT_REG reduced, 2.5NC hysteresis
THM Hot No-Charge Threshold
(T4)
ICHG = 0mA, when charging is suspended, 3NC
hysteresis
42.8
29.8
57
19.5
45
30
60
19.8
47.5
30.6
63.5
20.1
NC
% of
THMSW
NC
% of
THMSW
THM Hot Discharge Threshold
(TOT)
OT asserts low, 5NC hysteresis
71
12.6
75
12.9
80
13.1
NC
% of
THMSW
THM Input leakage
THMSW Output Leakage
THMSW Output Voltage High
THM = GND or LDO
THMSW = GND
Sourcing 1mA
TA = +25NC
TA = +85NC
TA = +25NC
TA = +85NC
-1
-0.2
VLDO -
0.05
+0.001
0.01
+0.001
0.01
+1
+1
FA
FA
V
LOGIC I/O: PEN1, PEN2, CHG, FLT, DONE, DOK, UOK, USUS, THMEN)
High level
Logic-Input Thresholds
Low level
Hysteresis
Logic-Input Leakage Current
VIN = 0 to 5.5V
TA = +25NC
TA = +85NC
Logic-Low Output Voltage
Sinking 1mA
Logic-High Output Leakage
Current
VOUT = 5.5V
TA = +25NC
TA = +85NC
1.3
0.4
50
0.001
1
0.01
25 100
0.001
1
0.01
V
mV
FA
mV
FA
Note 1: Limits are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by design.
Note 2: NC includes external NTC thermistor error. % of THMSW excludes thermistor beta error and external pullup error. NTC
thermistor assumed to be 100kI Q1% nominal, part number Vishay NTHS0603N01N1003FF, external pullup resistor =
100kI Q1%.
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
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
(> T3) TRANSITION
MAX8934G toc32
VTHM
VBATT
1.0V
4.2V
4.075V
500mV/div
200mV/div
IBATT 940mA
HP6060B ELECTRONIC LOAD
SET TO CC MODE
10ms/div
500mA/div
VTHM
VBATT
THM NORMAL TO THM HOT NO
CHARGE (> T4) TRANSITION
MAX8934G toc33
0.65V
500mV/div
4.2V 4.075V
0V 2V/div
IBATT 100mA
HP6060B ELECTRONIC
LOAD SET TO CC MODE
20ms/div
0mA 100mA/div
VTHM
VOT
THM NORMAL TO THM HOT
THRESHOLD DISCHARGE TOT
MAX8934G toc34
2V/div
3V 0.425V
2V/div
VBATT
VSYS
3.6V
3.6V
4ms/div
2V/div
2V/div
VTHM
VBATT
THM NORMAL TO T2 TO T1
(COLD, NO CHARGE) TRANSITION
MAX8934G toc35
2.2V 1V/div
4.2V
2.54V
4.075V
1V/div
420mA
0V
IBATT 10I RESISTOR FROM BATT TO GND
0mA
10ms/div
200mA/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet MAX8934G.PDF ] | |
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