19-4356; Rev 0; 10/08
Battery Switch with Four Enable Inputs
General Description
The MAX14525 features a low R
ON
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.
♦
Low 35mΩ (typ) R
ON
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
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 -40°C to +85°C 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
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.
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 (T
A
= +70°C)
8-Pin TDFN (derate 11.9 mW/°C above +70°C) .........954 mW
Junction-to-Case Thermal Resistance
(θ
JC
) (Note 1) ...............................................................37°C/W
Junction-to-Ambient Thermal Resistance
(θ
JA
) (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
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
(V
BAT
= +2.2V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
BAT
= +3.6V and T
A
= +25°C.)
(Note 2)
PARAMETER
DC CHARACTERISTICS
Input Voltage Range
On-Resistance
Disable Supply Current
V
BAT
Supply Current
Increase in Supply Current with
V
JIG
/V
S_EN
Voltage
Increase in Supply Current with
V
ON_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
V
IH
V
IL
I
IN
V
IN_TH
V
ON_K_TH
Low-to-high transition
(Figure 1)
V
BAT
= +5.5V
-200
0.3 x
V
BAT
2.94
3.0
1%
V
TA
= 1V
50
1.4
0.4
+200
0.6 x
V
BAT
3.06
V
TA_TH
1.15
1.7
1%
100
180
kΩ
V
V
nA
V
V
2.5
V
V
BAT
, V
IN
R
ON
I
BAT_DIS
I
BAT
ΔI
BAT
ΔI
BAT
I
LIM
I
LOAD
= 100mA, V
BAT
= +3.0V
V
BAT
= +5.5V
(V
JIG
= V
S_EN
= V
ON_K
= V
TA
= V
IN
= 0)
V
JIG
= V
S_EN
= V
BAT
, V
ON_K
= V
TA
= 0
V
JIG
= V
S_EN
= V
IH
or V
IL
V
BAT
= V
ON_K
= +3.6V
V
BAT
= +3.6V
Ramping V
BAT
5
1.9
0.8
2.2
35
5.5
90
1
4.5
2
4.5
V
mΩ
µA
µA
µA
µA
A
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Battery Switch with Four Enable Inputs
ELECTRICAL CHARACTERISTICS (continued)
(V
BAT
= +2.2V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
BAT
= +3.6V and T
A
= +25°C.)
(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
I
ON_K
t
ONDLY
t
ONRISE
t
OFFDLY
t
OFFFALL
CONDITIONS
V
BAT
= V
ON_K
= +3.6V
From any enable high to V
IN
= 10% of V
BAT
V
IN
10% to 90% of V
BAT
From any enable low to V
IN
= 90% of V
BAT
V
IN
90% to 10% of V
BAT
500
600
1800
130
60
MIN
TYP
MAX
3
2600
5000
300
150
UNITS
µA
µs
µs
µs
µs
MAX14525
SWITCH DYNAMICS (R
L
= 20Ω, C
L
= 0.1µF) (Figure 2)
Note 2:
Devices are tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Typical Operating Characteristics
(V
IN
= +3.6V, T
A
= +25°C, unless otherwise noted.)
NORMALIZED R
ON
vs. V
IN
MAX14525 toc01
NORMALIZED R
ON
vs. TEMPERATURE
1.8
1.6
NORMALIZED R
ON
1.4
1.2
1.0
0.8
0.6
0.4
I
L
= 100mA
V
BAT
= +3.0V
-40
-15
10
35
60
85
MAX14525 toc02
TA THRESHOLD vs. V
IN
MAX14525 toc03
1.5
1.4
1.3
NORMALIZED R
ON
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
2.2
3.3
V
IN
(V)
4.4
I
L
= 100mA
2.0
2.50
2.25
TA THRESHOLD (V)
T
A
= +25°C
2.00
1.75
1.50
1.25
1.00
2.2
3.3
V
IN
(V)
4.4
T
A
= +85°C
T
A
= -40°C
0.2
0
5.5
5.5
TEMPERATURE (°C)
ON_K THRESHOLD vs. V
IN
MAX14525 toc04
S_EN THRESHOLD vs. V
IN
MAX14525 toc05
3.010
T
A
= +25°C
ON_K THRESHOLD (V)
3.005
1.25
T
A
= -40°C
1.15
S_EN THRESHOLD (V)
1.05
3.000
T
A
= +85°C
0.95
T
A
= +25°C
0.85
T
A
= +85°C
2.995
T
A
= -40°C
2.990
2.2
3.3
V
IN
(V)
4.4
5.5
0.75
2.2
3.3
V
IN
(V)
4.4
5.5
_______________________________________________________________________________________
3
Battery Switch with Four Enable Inputs
MAX14525
Typical Operating Characteristics (continued)
(V
IN
= +3.6V, T
A
= +25°C, unless otherwise noted.)
BAT CURRENT vs. VOLTAGE
MAX14525 toc06
TURN-ON TIME vs. V
IN
MAX14525 toc07
TURN-ON DELAY vs. V
IN
MAX14525 toc08
3.5
T
A
= -40°C
2.8
T
A
= +25°C
I
BAT
(μA)
2.1
1200
4.0
1000
TURN-ON TIME (μs)
3.2
TURN-ON DELAY (ms)
T
A
= +85°C
2.4
800
T
A
= +25°C
600
T
A
= +85°C
1.4
T
A
= +85°C
0.7
1.6
400
R
L
= 20Ω
C
L
= 0.1μF
2.2
3.3
0.8
T
A
= -40°C
0
4.4
V
IN
(V)
5.5
2.2
T
A
= -40°C
T
A
= +25°C
R
L
= 20Ω
C
L
= 0.1μF
5.5
0
2.2
3.3
V
BAT
(V)
4.4
5.5
200
3.3
V
IN
(V)
4.4
TURN-OFF TIME vs. V
IN
MAX14525 toc09
TURN-OFF DELAY vs. V
IN
MAX14525 toc10
180
T
A
= +85°C
160
TURN-OFF TIME (μs)
80
72
TURN-OFF DELAY (μs)
T
A
= +85°C
140
64
120
T
A
= +25°C
56
T
A
= -40°C
48
T
A
= +25°C
100
T
A
= -40°C
R
L
= 20Ω
C
L
= 0.1μF
4.4
V
IN
(V)
5.5
R
L
= 20Ω
C
L
= 0.1μF
2.2
3.3
V
IN
(V)
4.4
5.5
80
2.2
3.3
40
TURN-ON RESPONSE
MAX14525 toc11
TURN-OFF RESPONSE
MAX14525 toc12
V
JIG
1V/div
V
IN
1V/div
V
JIG
1V/div
V
BAT
= +3.6V
C
L
= 0.1μF
R
L
= 20Ω
400μs/div
V
BAT
= +3.6V
C
L
= 0.1μF
R
L
= 20Ω
400μs/div
V
IN
1V/div
4
_______________________________________________________________________________________
Battery Switch with Four Enable Inputs
MAX14525
OFF
ON_K INPUT
A
HYSTERESIS
B
RELEASED
THRESHOLD
DETECTOR
THRESHOLD
ON
OFF
V
BAT
IN
GND
Figure 1. ON_K Input Operation Diagram
V
IN
90% V
BAT
10% V
BAT
TIME
V
JIG
V
ON_K
V
TA
V
S_EN
t
OFFDLY
t
ONDLY
t
ONRISE
t
OFFFALL
TIME
Figure 2. Turn-On Delay Time, Turn-On Rise Time, Turn-Off Delay Time, and Turn-Off Fall Time
_______________________________________________________________________________________
5
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