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PDF MAX8934E Data sheet ( Hoja de datos )
| Número de pieza | MAX8934E | |
| Descripción | Smart Power Selector | |
| Fabricantes | Maxim Integrated Products | |
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19-4995; Rev 0; 2/10
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
General Description
The MAX8934_ dual-input Li+/Li-Poly linear battery char-
gers with Smart Power SelectorK safely charge a single
Li+/Li-Poly cell in accordance with JEITA recommenda-
tions. The MAX8934_ monitors the battery temperature
(TBATT) while charging, and automatically adjusts the
fast-charge current and charge termination voltage as the
battery temperature varies. The MAX8934_ 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. Two safety
profiles are supported (see the Charging Profiles section
for details). An ultra-low IQ, always-on LDO provides an
additional 3.3V supply for system power.
The MAX8934_ 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 MAX8934_ features a Smart Power Selector to
make the best use of limited USB or adapter power.
Input current limit and battery charge current limit are
independently 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 for the
MAX8934A/MAX8934B/MAX8934C/MAX8934E and up to
1.5mA (max) for the MAX8934D. Automatic input selection
switches the system load from battery to external power.
The MAX8934A provides a SYS output voltage of 5.3V,
while the MAX8934B–MAX8934E 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 MAX8934_ 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
*Protected by U.S.Patent #6,507,172.
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 or 5.3V SYS Regulation Voltage
S 1.5A (max) USB Input Current Limit (MAX8934D)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8934AETI+
-40NC to +85NC 28 Thin QFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information continued and Selector Guide appears
at end of data sheet.
Typical Operating Circuit
AC
ADAPTER
USB
DC Q1
3.3V ALWAYS-ON
LINEAR
REGULATOR
LDO
SYS
CHARGE
CURRENT
LOAD
CURRENT
USB Q2
Q3
CHARGE
AND
SYS LOAD
SWITCH
MAX8934A−
MAX8934E
BATT
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
BATT Charge Current Accuracy
CONDITIONS
VSYS = 5.5V,
VTHM_T2 < VTHM
< VTHM_T4 (safety
region 1) or VTHM_T1
< VTHM < VTHM_T4
(safety region 2)
RISET = 2kI
RISET = 4kI
RISET = 10kI
RISET = 2kI, VBATT = 2.5V
(prequal)
RISET = 4kI, VBATT = 2.5V
(prequal)
RISET = 10kI, VBATT = 2.5V
(prequal)
VSYS = 5.5V,
VTHM_T1 < VTHM
< VTHM_T2 (safety
region 1)
RISET = 2kI
RISET = 4kI
RISET = 10kI
RISET = 2kI, VBATT = 2.5V
(prequal)
RISET = 4kI, VBATT = 2.5V
(prequal)
MIN
1350
675
270
130
TYP
1500
750
300
150
MAX
1650
825
330
170
UNITS
50 75 100
30
675 750 825
337.5 375 412.5
130 150 170
100 150 200
mA
50 75 100
RISET = 10kI, VBATT = 2.5V
(prequal)
30
ISET Output Voltage
Charger Soft-Start Time
BATT Prequal Threshold
BATT Input Current
RISET = 4kI, IBATT = 500mA (VISET = 1.5V at full
charge current) VTHM_T2 < VTHM < VTHM_T4
Charge-current ramp time
VBATT rising, 180mV hysteresis
No DC or USB power
connected, THMEN = low,
VCEN = 5V
VBATT = 4.2V,
ILDO = 0
No DC or USB power
connected, THMEN = high,
V CEN = 5V
DC or USB power connected,
V CEN = 5V
0.9 1 1.1
1.5
2.9 3 3.1
5 12
12 25
0.003
2
V
ms
V
FA
DONE Threshold as a
Percentage of Fast-Charge
Current
IBATT decreasing
10 %
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
Typical Operating Characteristics (continued)
(MAX8934A, TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
VBATT
VSYS
IDC
DC CONNECT WITH NO
USB (RSYS = 22I)
MAX8934A/B/C toc20
5V/div
3.6V 5V/div
3.5V 5V
CDC CHARGING
0A
1.2A 1A/div
VBATT
VSYS
IDC
DC DISCONNECT WITH NO
USB (RSYS = 22I)
MAX8934A/B/C toc21
3.6V
3.5V
5V/div
5V/div
1A 1A/div
0A
160mA
IBATT
0mA
BATTERY CHARGER
SOFT-START
400Fs/div
1A/div
-1A
IBATT
-820mA
-IBATT = CHARGING
400Fs/div
160mA
1A/div
USB CONNECT WITH NO
VUSB
DC (RSYS = 22I)
MAX8934A/B/C toc22
5V CSYS CHARGING
5V/div
500mA/div
IUSB 0A
475mA
VSYS 3.6V
CUSB CHARGING
5V
4.2V
5V/div
VUOK
VCHG
IBATT
3.3V
3.3V
+160mA
BATTERY
CHARGER SOFT-START
200Fs/div
5V/div
5V/div
-260mA 500mA/div
USB DISCONNECT WITH NO
DC (RSYS = 22I)
MAX8934A/B/C toc23
VUSB
IUSB
5V
475mA
5V/div
3V
0mA 500mA/div
VSYS 3.9V
VUOK
VCHG
IBATT -260mA
3.6V
3.3V
3.3V
+160mA
5V/div
5V/div
5V/div
500mA/div
200Fs/div
VUSUS
USB SUSPEND (RSYS = 22I)
MAX8934A/B/C toc24
0V 3V
5V/div
IUSB 475mA
4.2V
VSYS
0A
3.2V
500mA/div
5V/div
VCHG
IBATT
3.3V
0A
200Fs/div
5V/div
3.3V
VUSB = 5V
500mA/div
VUSUS
IUSB
VSYS
VCHG
IBATT
USB RESUME (RSYS = 22I)
MAX8934A/B/C toc25
3V 0V
5V/div
0A
3.3V 4.6V
475mA
4.2V
500mA/div
5V/div
3.3V
0A
BATTERY
CHARGER SOFT-START
200Fs/div
5V/div
500mA/div
VUSB = 5V
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX8934E.PDF ] | |
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