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19-4356; Rev 0; 10/08
Battery Switch with Four Enable Inputs
General Description
The MAX14525 features a low RON 35m (typ) load switch with four unique enable inputs. The MAX14525 is ideal for disconnecting the lithium-ion (Li+) battery from the loads in portable devices such as cell phones. The MAX14525 operates from a +2.2V to +5.5V supply voltage. The MAX14525 features an extremely low 0.8A (typ) quiescent supply current to maximize battery life in portable devices. It is enabled from four possible inputs: external charger connection capable of high voltage up to +28V, travel adapter (TA), on key (ON_K), factory mode enable (JIG), and switch enable (S_EN). The S_EN input is internally ANDed with the switched battery connection (IN). The MAX14525 is available in a small 8-pin, 2mm x 2mm TDFN package and operates over the -40C to +85C extended temperature range. Low 35m (typ) RON Load Switch Ultra Low, 0.8A (typ) Supply Current Four Enable Inputs: TA: +28V (max) Capable ON_K: Accurate +3V Trigger Enable JIG: Factory Mode Enable S_EN: Logically ANDed with IN Space-Saving 8-Pin, 2mm x 2mm TDFN Package Controlled Turn-On to Limit dI/dt Pulses Due to Lead Inductance
Features
MAX14525
Applications
Cell Phones PDAs GPS UMPC Computers Digital Cameras
PART MAX14525ETA+T
Ordering Information
PIN-PACKAGE 8 TDFN-EP* TOP MARK ACQ
Note: The device is specified over the -40C to +85C operating temperature range. +Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad.
Typical Application Circuit
TOP VIEW
Pin Configuration
BAT Li-ION BATTERY ON BUTTON ON_K
MAX14525
IN
CHARGER
AC ADAPTER
PHONE LOADS 3.0V
BAT JIG
1 2 3 4
+
MAX14525 *EP
8 7 6 5
IN IN TA GND
TA SLEW RATE CONTROL 2V JIG P S_EN
ON_K S_EN
GND
TDFN-EP 2mm x 2mm
*CONNECT EXPOSED PAD TO GND.
________________________________________________________________ Maxim Integrated Products
1
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Battery Switch with Four Enable Inputs MAX14525
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.) IN, BAT, JIG, S_EN, ON_K ................................... -0.3V to +6.0V TA ...........................................................................-0.3V to +28V Continuous Power Dissipation (TA = +70C) 8-Pin TDFN (derate 11.9 mW/C above +70C) .........954 mW Junction-to-Case Thermal Resistance (JC) (Note 1) ...............................................................37C/W Junction-to-Ambient Thermal Resistance (JA) (Note 1) ...............................................................84C/W Operating Temperature Range .......................... -40C to +85C Junction Temperature ..................................................... +150C Storage Temperature Range ............................ -65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VBAT = +2.2V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VBAT = +3.6V and TA = +25C.) (Note 2)
PARAMETER DC CHARACTERISTICS Input Voltage Range On-Resistance Disable Supply Current VBAT Supply Current Increase in Supply Current with VJIG/VS_EN Voltage Increase in Supply Current with VON_K Voltage Peak Current UVLO Undervoltage Lockout LOGIC INPUT TA Threshold Voltage TA Threshold Hysteresis TA Input Resistance JIG, S_EN Input Logic-High JIG, S_EN Input Logic-Low JIG, S_EN Input Leakage Current IN AND Gate Threshold Voltage ON_K Threshold Voltage ON_K Threshold Hysteresis VIH VIL IIN VIN_TH VON_K_TH Low-to-high transition (Figure 1) VBAT = +5.5V -200 0.3 x VBAT 2.94 3.0 1% VTA = 1V 50 1.4 0.4 +200 0.6 x VBAT 3.06 VTA_TH 1.15 1.7 1% 100 180 k V V nA V V 2.5 V VBAT, VIN RON IBAT_DIS IBAT IBAT IBAT ILIM ILOAD = 100mA, VBAT = +3.0V VBAT = +5.5V (VJIG = VS_EN = VON_K = VTA = VIN = 0) VJIG = VS_EN = VBAT , VON_K = VTA = 0 VJIG = VS_EN = VIH or VIL VBAT = VON_K = +3.6V VBAT = +3.6V Ramping VBAT 5 1.9 0.8 2.2 35 5.5 90 1 4.5 2 4.5 V m A A A A A V SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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Battery Switch with Four Enable Inputs
ELECTRICAL CHARACTERISTICS (continued)
(VBAT = +2.2V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VBAT = +3.6V and TA = +25C.) (Note 2)
PARAMETER ON_K Input Leakage Current Turn-On Delay Time Turn-On Rise Time Turn-Off Delay Time Turn-Off Fall Time SYMBOL ION_K tONDLY tONRISE tOFFDLY tOFFFALL CONDITIONS VBAT = VON_K = +3.6V From any enable high to VIN = 10% of VBAT VIN 10% to 90% of VBAT From any enable low to VIN = 90% of VBAT VIN 90% to 10% of VBAT 500 600 1800 130 60 MIN TYP MAX 3 2600 5000 300 150 UNITS A s s s s
MAX14525
SWITCH DYNAMICS (RL = 20, CL = 0.1F) (Figure 2)
Note 2: Devices are tested at TA = +25C. Specifications over temperature are guaranteed by design.
Typical Operating Characteristics
(VIN = +3.6V, TA = +25C, unless otherwise noted.)
NORMALIZED RON vs. VIN
MAX14525 toc01
NORMALIZED RON vs. TEMPERATURE
1.8 1.6 NORMALIZED RON 1.4 1.2 1.0 0.8 0.6 0.4 IL = 100mA VBAT = +3.0V -40 -15 10 35 60 85
MAX14525 toc02
TA THRESHOLD vs. VIN
MAX14525 toc03
1.5 1.4 1.3 NORMALIZED RON 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 2.2 3.3 VIN (V) 4.4 IL = 100mA
2.0
2.50 2.25 TA THRESHOLD (V) TA = +25C 2.00 1.75 1.50 1.25 1.00 2.2 3.3 VIN (V) 4.4 TA = +85C TA = -40C
0.2 0 5.5
5.5
TEMPERATURE (C)
ON_K THRESHOLD vs. VIN
MAX14525 toc04
S_EN THRESHOLD vs. VIN
MAX14525 toc05
3.010 TA = +25C ON_K THRESHOLD (V) 3.005
1.25 TA = -40C
1.15 S_EN THRESHOLD (V)
1.05
3.000
TA = +85C
0.95 TA = +25C 0.85 TA = +85C
2.995
TA = -40C
2.990 2.2 3.3 VIN (V) 4.4 5.5
0.75 2.2 3.3 VIN (V) 4.4 5.5
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Battery Switch with Four Enable Inputs MAX14525
Typical Operating Characteristics (continued)
(VIN = +3.6V, TA = +25C, unless otherwise noted.)
BAT CURRENT vs. VOLTAGE
MAX14525 toc06
TURN-ON TIME vs. VIN
MAX14525 toc07
TURN-ON DELAY vs. VIN
MAX14525 toc08
3.5 TA = -40C 2.8 TA = +25C IBAT (A) 2.1
1200
4.0
1000 TURN-ON TIME (s)
3.2 TURN-ON DELAY (ms) TA = +85C 2.4
800 TA = +25C 600
TA = +85C
1.4 TA = +85C 0.7
1.6
400
RL = 20 CL = 0.1F 2.2 3.3
0.8 TA = -40C 0 4.4 VIN (V) 5.5 2.2
TA = -40C
TA = +25C
RL = 20 CL = 0.1F 5.5
0 2.2 3.3 VBAT (V) 4.4 5.5
200
3.3 VIN (V)
4.4
TURN-OFF TIME vs. VIN
MAX14525 toc09
TURN-OFF DELAY vs. VIN
MAX14525 toc10
180 TA = +85C 160 TURN-OFF TIME (s)
80
72 TURN-OFF DELAY (s)
TA = +85C
140
64
120
TA = +25C
56 TA = -40C 48
TA = +25C
100
TA = -40C
RL = 20 CL = 0.1F 4.4 VIN (V) 5.5
RL = 20 CL = 0.1F 2.2 3.3 VIN (V) 4.4 5.5
80 2.2 3.3
40
TURN-ON RESPONSE
MAX14525 toc11
TURN-OFF RESPONSE
MAX14525 toc12
VJIG 1V/div
VIN 1V/div VJIG 1V/div VBAT = +3.6V CL = 0.1F RL = 20 400s/div VBAT = +3.6V CL = 0.1F RL = 20 400s/div VIN 1V/div
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Battery Switch with Four Enable Inputs MAX14525
OFF ON_K INPUT A HYSTERESIS B RELEASED THRESHOLD DETECTOR THRESHOLD ON OFF
VBAT
IN
GND
Figure 1. ON_K Input Operation Diagram
VIN
90% VBAT
10% VBAT TIME
VJIG VON_K VTA VS_EN
tOFFDLY tONDLY tONRISE tOFFFALL
TIME
Figure 2. Turn-On Delay Time, Turn-On Rise Time, Turn-Off Delay Time, and Turn-Off Fall Time
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Battery Switch with Four Enable Inputs MAX14525
Pin Description
PIN 1 2 3 4 5 6 7, 8 -- NAME BAT JIG ON_K S_EN GND TA IN EP Lithium-Ion (Li+) Battery Connection Enable Input with Standard Logic Threshold Enable Input with Accurate Threshold (+3.0V) Enable Input with Standard Logic Threshold Logically ANDed with IN Ground Enable Input with High Threshold Power Switch Input. The power switch input voltage range is from +2.2V to +5.5V. Connect a 0.1F capacitor from IN to GND. Connect pins 7 and 8 together for proper operation. Exposed Pad. Connect EP to ground. Do not use EP as the only ground connection. FUNCTION
Detailed Description
The MAX14525 features a low 35m (typ) RON load switch with four unique enable inputs. The MAX14525 can be used to disconnect the lithium-ion battery from the loads in portable devices such as cell phones. It operates from a +2.2V to +5.5V supply voltage. The MAX14525 features an ultra-low 0.8A (typ) quiescent supply current to maximize battery life in portable devices. The device is enabled from four possible inputs: external charge connection travel adapter (TA), on key (ON_K), factory mode enable (JIG), and switch enable (S_EN). The S_EN input is internally ANDed with the switched battery connection (IN).
until the battery threshold is above +3.0V 2%. When the battery has a very low charge and the on key is pressed, the accurate threshold does not allow the phone to boot up.
JIG Input
The JIG input on the MAX14525 is a logic-level input (+1.8V compatible) from an external source to indicate the device has been connected to a factory cable. This signal requires a standard logic-input threshold voltage (+1.4V high).
S_EN Input
The S_EN input on the MAX14525 is a logic-level input (+1.8V compatible) from an external source used to hold the switch on when the triggering condition (TA, ON_K, or JIG) is removed. The standard logic threshold voltage comes from the host microprocessor that pulls S_EN high once the code has begun running on the microprocessor. The S_EN input is internally ANDed with the voltage on IN. The IN connection to the AND gate thresholds are standard CMOS values of 1/3 and 2/3 of VBAT.
TA Input
The TA input on the MAX14525 can be connected directly to the external charger source. The TA input is high-voltage capable (+28V max) and features a high threshold voltage to limit false voltage trips, and an input resistance of 100k (typ) to ground.
ON_K Input
The ON_K line is active high and is pulled up to the lithium-ion battery through a momentary push button switch. This input features an accurate voltage detector threshold which does not enable the load switch
Chip Information
PROCESS: CMOS
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Battery Switch with Four Enable Inputs
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 8 TDFN-EP PACKAGE CODE T822+2 DOCUMENT NO. 21-0168
MAX14525
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 _____________________ 7
(c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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