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MAX8934A

Description
Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
File Size1MB,32 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Compare View All

MAX8934A Overview

Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring

EVALUATION KIT AVAILABLE
MAX8934A–MAX8934E
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
(T
BATT
) 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 pro-
files are supported (see Figure 6 for details). An ultra-low
I
Q
, 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 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 for the MAX8934A/
MAX8934B/MAX8934C/MAX8934E and up to 1.5A (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.
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 I
Q
, 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
LDO
3.3V ALWAYS-ON
LINEAR
REGULATOR
AC
ADAPTER
DC
Q1
CHARGE
CURRENT
Q3
CHARGE
AND
SYS LOAD
SWITCH
SYS
LOAD
CURRENT
SYSTEM
LOAD
Applications
PDAs, Palmtop, and Wireless Handhelds
Portable Media, MP3 Players, and PNDs
Digital Still Cameras and Digital Video Cameras
Handheld Game Systems
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
*Protected
by U.S. Patent #6,507,172.
USB
USB Q2
BATT
BATTERY
MAX8934A−
MAX8934E
GND
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4995; Rev 3; 1/14

MAX8934A Related Products

MAX8934A MAX8934BETI+ MAX8934AETI+ MAX8934DETI+ MAX8934E MAX8934EETI+
Description Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
Is it lead-free? - Lead free Lead free Lead free - Lead free
Is it Rohs certified? - conform to conform to conform to - conform to
Maker - Maxim Maxim Maxim - Maxim
Parts packaging code - QFN QFN QFN - QFN
package instruction - HVQCCN, LCC28,.16SQ,16 HVQCCN, LCC28,.16SQ,16 HVQCCN, LCC28,.16SQ,16 - HVQCCN, LCC28,.16SQ,16
Contacts - 28 28 28 - 28
Reach Compliance Code - compli compli compli - compli
ECCN code - EAR99 EAR99 EAR99 - EAR99
Factory Lead Time - 6 weeks 6 weeks 6 weeks - 6 weeks
Samacsys Descripti - Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring Maxim MAX8934DETI+, Battery Backup IC Lithium-Ion, Lithium-Polymer, 6.6 V, 1.5A, 28-Pin, TQFN - Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
Adjustable threshold - YES YES YES - YES
Analog Integrated Circuits - Other Types - POWER SUPPLY SUPPORT CIRCUIT POWER SUPPLY SUPPORT CIRCUIT POWER SUPPLY SUPPORT CIRCUIT - POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code - S-XQCC-N28 S-XQCC-N28 S-XQCC-N28 - S-XQCC-N28
JESD-609 code - e3 e3 e3 - e3
length - 4 mm 4 mm 4 mm - 4 mm
Humidity sensitivity level - 1 1 1 - 1
Number of channels - 1 1 1 - 1
Number of functions - 1 1 1 - 1
Number of terminals - 28 28 28 - 28
Maximum operating temperature - 85 °C 85 °C 85 °C - 85 °C
Minimum operating temperature - -40 °C -40 °C -40 °C - -40 °C
Package body material - UNSPECIFIED UNSPECIFIED UNSPECIFIED - UNSPECIFIED
encapsulated code - HVQCCN HVQCCN HVQCCN - HVQCCN
Encapsulate equivalent code - LCC28,.16SQ,16 LCC28,.16SQ,16 LCC28,.16SQ,16 - LCC28,.16SQ,16
Package shape - SQUARE SQUARE SQUARE - SQUARE
Package form - CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE - CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius) - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED - NOT SPECIFIED
power supply - 5 V 5 V 5 V - 5 V
Certification status - Not Qualified Not Qualified Not Qualified - Not Qualified
Maximum seat height - 0.8 mm 0.8 mm 0.8 mm - 0.8 mm
Maximum supply current (Isup) - 2 mA 2 mA 2 mA - 2 mA
Maximum supply voltage (Vsup) - 6.6 V 6.6 V 6.6 V - 6.6 V
Minimum supply voltage (Vsup) - 4.1 V 4.1 V 4.1 V - 4.1 V
Nominal supply voltage (Vsup) - 5 V 5 V 5 V - 5 V
surface mount - YES YES YES - YES
technology - BICMOS BICMOS BICMOS - BICMOS
Temperature level - INDUSTRIAL INDUSTRIAL INDUSTRIAL - INDUSTRIAL
Terminal surface - Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) - Matte Tin (Sn)
Terminal form - NO LEAD NO LEAD NO LEAD - NO LEAD
Terminal pitch - 0.4 mm 0.4 mm 0.4 mm - 0.4 mm
Terminal location - QUAD QUAD QUAD - QUAD
Maximum time at peak reflow temperature - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED - NOT SPECIFIED
width - 4 mm 4 mm 4 mm - 4 mm

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