General Description
The MAX14525 features a low RON 35mΩ(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 0.8µA (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 -40°C to
+85°C extended temperature range.
Applications
Cell Phones
PDAs
GPS
UMPC Computers
Digital Cameras
Features
♦Low 35mΩ(typ) RON Load Switch
♦Ultra Low, 0.8µA (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
MAX14525
Battery Switch with Four Enable Inputs
________________________________________________________________
Maxim Integrated Products
1
MAX14525
*EP
*CONNECT EXPOSED PAD TO GND.
TOP VIEW
GND
TA
IN
IN
5
6
7
8
4
3
2
1
S_EN
ON_K
JIG
BAT
TDFN-EP
2mm x 2mm
+
Pin Configuration
MAX14525
3.0V
2V
P
ON
BUTTON
SLEW RATE
CONTROL
CHARGER AC
ADAPTER
PHONE
LOADS
Li-ION
BATTERY
S_EN
JIG
ON_K
BAT IN
TA
GND
Typical Application Circuit
19-4356; Rev 0; 10/08
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.
Ordering Information
PART PIN-PACKAGE TOP MARK
M AX 14525E TA+ T
8 TDFN-EP* ACQ
Note: The device is specified over the -40°C to +85°C operating
temperature range.
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
MAX14525
Battery Switch with Four Enable Inputs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VBAT = +2.2V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VBAT = +3.6V and TA= +25°C.)
(Note 2)
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.
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.
(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= +70°C)
8-Pin TDFN (derate 11.9 mW/°C above +70°C) .........954 mW
Junction-to-Case Thermal Resistance
(θJC) (Note 1) ...............................................................37°C/W
Junction-to-Ambient Thermal Resistance
(θJA) (Note 1) ...............................................................84°C/W
Operating Temperature Range .......................... -40°C to +85°C
Junction Temperature..................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DC CHARACTERISTICS
Input Voltage Range
VBAT, VIN
2.2 5.5 V
On-Resistance RON ILOAD = 100mA, VBAT = +3.0V 35 90 mΩ
Disable Supply Current
IBAT_DIS
VBAT = +5.5V
(VJIG = VS_EN = VON_K = VTA = VIN = 0) 1µA
VBAT Supply Current IBAT VJIG = VS_EN = VBAT , VON_K = VTA = 0 0.8 4.5 µA
Increase in Supply Current with
VJIG/VS_EN Voltage ΔIBAT VJIG = VS_EN = VIH or VIL 2µA
Increase in Supply Current with
VON_K Voltage ΔIBAT VBAT = VON_K = +3.6V 4.5 µA
Peak Current ILIM VBAT = +3.6V 5 A
UVLO Undervoltage Lockout Ramping VBAT 1.9 V
LOGIC INPUT
TA Threshold Voltage VTA_TH
1.15
1.7 2.5 V
TA Threshold Hysteresis 1%
TA Input Resistance VTA = 1V 50
100 180
kΩ
JIG, S_EN Input Logic-High VIH 1.4 V
JIG, S_EN Input Logic-Low VIL 0.4 V
JIG, S_EN Input Leakage Current
IIN VBAT = +5.5V
-200 +200
nA
IN AND Gate Threshold Voltage VIN_TH 0.3 x
VBAT
0.6 x
VBAT
V
ON_K Threshold Voltage
VON_K_TH
Low-to-high transition
(Figure 1)
2.94
3.0
3.06
V
ON_K Threshold Hysteresis 1%
MAX14525
Battery Switch with Four Enable Inputs
_______________________________________________________________________________________ 3
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ON_K Input Leakage Current I
ON_K
V
BAT
= V
ON_K
= +3.6V 3 µA
SWITCH DYNAMICS (R
L
= 20Ω, C
L
= 0.1µF) (Figure 2)
Turn-On Delay Time t
ONDLY
From any enable high to V
IN
= 10% of V
BAT
600 2600
µs
Turn-On Rise Time
t
ONRISE
V
IN
10% to 90% of V
BAT
500 1800 5000
µs
Turn-Off Delay Time
t
OFFDLY
From any enable low to V
IN
= 90% of V
BAT
130 300
µs
Turn-Off Fall Time
t
OFFFALL
V
IN
90% to 10% of V
BAT
60
150
µs
ELECTRICAL CHARACTERISTICS (continued)
(VBAT = +2.2V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VBAT = +3.6V and TA= +25°C.)
(Note 2)
Note 2: Devices are tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Typical Operating Characteristics
(VIN = +3.6V, TA= +25°C, unless otherwise noted.)
NORMALIZED RON vs. VIN
MAX14525 toc01
VIN (V)
IL = 100mA
NORMALIZED RON
4.43.3
0.8
0.9
1.0
1.3
1.4
0.6
0.7
1.1
1.2
1.5
0.5
2.2 5.5
NORMALIZED RON vs. TEMPERATURE
MAX14525 toc02
TEMPERATURE (°C)
NORMALIZED RON
-15 60
0.6
0.8
1.0
1.6
1.8
0.4
1.4
0.2
1.2
2.0
0
-40 3510 85
IL = 100mA
VBAT = +3.0V
TA THRESHOLD vs. VIN
MAX14525 toc03
VIN (V)
TA THRESHOLD (V)
4.43.3
1.50
1.75
2.25
1.25
2.00
2.50
1.00
2.2 5.5
TA = +85°C
TA = -40°C
TA = +25°C
ON_K THRESHOLD vs. VIN
MAX14525 toc04
VIN (V)
ON_K THRESHOLD (V)
4.43.3
2.995
3.000
3.005
3.010
2.990
2.2 5.5
TA = +85°C
TA = -40°C
TA = +25°C
S_EN THRESHOLD vs. VIN
MAX14525 toc05
VIN (V)
S_EN THRESHOLD (V)
4.43.3
0.95
0.85
1.05
1.15
1.25
0.75
2.2 5.5
TA = +85°C
TA = -40°C
TA = +25°C
MAX14525
Battery Switch with Four Enable Inputs
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VIN = +3.6V, TA= +25°C, unless otherwise noted.)
BAT CURRENT vs. VOLTAGE
MAX14525 toc06
VBAT (V)
IBAT (μA)
4.43.3
1.4
0.7
2.1
2.8
3.5
0
2.2 5.5
TA = +85°C
TA = -40°C
TA = +25°C
TURN-ON TIME vs. VIN
MAX14525 toc07
VIN (V)
TURN-ON TIME (μs)
4.43.3
600
400
800
1000
1200
200
2.2 5.5
TA = +85°C
TA = -40°C
TA = +25°C
RL = 20Ω
CL = 0.1μF
TURN-ON DELAY vs. VIN
MAX14525 toc08
VIN (V)
TURN-ON DELAY (ms)
4.43.3
1.6
0.8
2.4
3.2
4.0
0
2.2 5.5
TA = +85°C
TA = -40°CTA = +25°C
RL = 20Ω
CL = 0.1μF
TURN-OFF TIME vs. VIN
MAX14525 toc09
VIN (V)
TURN-OFF TIME (μs)
4.43.3
120
100
140
160
180
80
2.2 5.5
TA = +85°C
TA = -40°C
TA = +25°C
RL = 20Ω
CL = 0.1μF
TURN-OFF DELAY vs. VIN
MAX14525 toc10
VIN (V)
TURN-OFF DELAY (μs)
4.43.3
56
48
64
72
80
40
2.2 5.5
TA = +85°C
TA = -40°C
TA = +25°C
RL = 20Ω
CL = 0.1μF
TURN-ON RESPONSE
MAX14525 toc11
400
μ
s/div
VJIG
1V/div
VIN
1V/div
VBAT = +3.6V
CL = 0.1μF
RL = 20Ω
TURN-OFF RESPONSE
MAX14525 toc12
400
s/div
VJIG
1V/div
VIN
1V/div
VBAT = +3.6V
CL = 0.1μF
RL = 20Ω
MAX14525
Battery Switch with Four Enable Inputs
_______________________________________________________________________________________ 5
HYSTERESIS
A
B
ON_K INPUT
VBAT
DETECTOR
THRESHOLD
RELEASED
THRESHOLD
ON OFFOFF
GND
IN
Figure 1. ON_K Input Operation Diagram
TIME
TIME
10% VBAT
90% VBAT
VIN
VJIG
VON_K
VTA
VS_EN
tONDLY tONRISE
tOFFDLY
tOFFFALL
Figure 2. Turn-On Delay Time, Turn-On Rise Time, Turn-Off Delay Time, and Turn-Off Fall Time
MAX14525
Detailed Description
The MAX14525 features a low 35mΩ(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 0.8µA (typ) quies-
cent 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).
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 100kΩ(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 detec-
tor threshold which does not enable the load switch
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 thresh-
old 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.
Chip Information
PROCESS: CMOS
Battery Switch with Four Enable Inputs
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 BAT Lithium-Ion (Li+) Battery Connection
2 JIG Enable Input with Standard Logic Threshold
3 ON_K Enable Input with Accurate Threshold (+3.0V)
4 S_EN Enable Input with Standard Logic Threshold Logically ANDed with IN
5 GND Ground
6 TA Enable Input with High Threshold
7, 8 IN Power Switch Input. The power switch input voltage range is from +2.2V to +5.5V. Connect a 0.1µF
capacitor from IN to GND. Connect pins 7 and 8 together for proper operation.
— EP Exposed Pad. Connect EP to ground. Do not use EP as the only ground connection.
MAX14525
Battery Switch with Four Enable Inputs
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
© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
8 TDFN-EP T822+2 21-0168
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.