MAX14525 [MAXIM]
Battery Switch with Four Enable Inputs; 有四个使能输入的电池开关
| 型号： | MAX14525 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Battery Switch with Four Enable Inputs |
| 文件： | 总7页 (文件大小：129K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4356; Rev 0; 10/08
Battery Switch with Four Enable Inputs
MAX1425
General Description
Features
The MAX14525 features a low R
35mΩ (typ) load
ON
♦ Low 35mΩ (typ) R
Load Switch
ON
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.
♦ Ultra Low, 0.8µA (typ) Supply Current
♦ Four Enable Inputs:
TA: +28V (max) Capable
ON_K: Accurate +3V Trigger Enable
JIG: Factory Mode Enable
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).
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
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
Ordering Information
Cell Phones
PDAs
PART
PIN-PACKAGE
TOP MARK
MAX14525ETA+T
8 TDFN-EP*
ACQ
GPS
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.
UMPC Computers
Digital Cameras
Typical Application Circuit
Pin Configuration
TOP VIEW
MAX14525
BAT
IN
AC
ADAPTER
CHARGER
ON_K
Li-ION
BATTERY
BAT
JIG
+
IN
1
2
3
4
8
7
6
5
ON
BUTTON
PHONE
LOADS
IN
3.0V
MAX14525
*EP
ON_K
S_EN
TA
TA
SLEW RATE
CONTROL
GND
2V
JIG
P
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
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
Junction-to-Ambient Thermal Resistance
IN, BAT, JIG, S_EN, ON_K ................................... -0.3V to +6.0V
TA ...........................................................................-0.3V to +28V
(θ ) (Note 1) ...............................................................84°C/W
JA
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
Continuous Power Dissipation (T = +70°C)
A
8-Pin TDFN (derate 11.9 mW/°C above +70°C) .........954 mW
Junction-to-Case Thermal Resistance
(θ ) (Note 1) ...............................................................37°C/W
JC
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.
MAX1425
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
= +2.2V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= +3.6V and T = +25°C.)
BAT A
BAT
A
(Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
Input Voltage Range
On-Resistance
V
, V
2.2
5.5
90
V
BAT IN
R
I
= 100mA, V
= +5.5V
= +3.0V
35
mΩ
ON
LOAD
BAT
V
(V
BAT
Disable Supply Current
I
1
4.5
2
µA
µA
µA
BAT_DIS
= V
= V
= V = V = 0)
ON_K TA IN
JIG
S_EN
V
Supply Current
I
V
= V
= V
, V
ON_K
= V = 0
0.8
BAT
BAT
JIG
S_EN
BAT
TA
Increase in Supply Current with
/V Voltage
ΔI
ΔI
V
= V
= V or V
IH
BAT
JIG
S_EN
IL
V
JIG S_EN
Increase in Supply Current with
Voltage
V
V
= V = +3.6V
ON_K
4.5
µA
BAT
LIM
BAT
BAT
V
ON_K
Peak Current
I
= +3.6V
5
A
V
UVLO Undervoltage Lockout
LOGIC INPUT
Ramping V
1.9
2.5
180
BAT
TA Threshold Voltage
TA Threshold Hysteresis
TA Input Resistance
V
1.15
1.7
1%
100
V
TA_TH
V
V
= 1V
50
kΩ
V
TA
JIG, S_EN Input Logic-High
JIG, S_EN Input Logic-Low
JIG, S_EN Input Leakage Current
V
1.4
IH
V
0.4
V
IL
I
= +5.5V
BAT
-200
0.3 x
+200
nA
IN
0.6 x
V
BAT
IN AND Gate Threshold Voltage
V
V
V
IN_TH
V
BAT
Low-to-high transition
(Figure 1)
ON_K Threshold Voltage
V
2.94
3.0
1%
3.06
ON_K_TH
ON_K Threshold Hysteresis
2
_______________________________________________________________________________________
Battery Switch with Four Enable Inputs
MAX1425
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2.2V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= +3.6V and T = +25°C.)
BAT A
BAT
A
(Note 2)
PARAMETER
ON_K Input Leakage Current
SWITCH DYNAMICS (R = 20Ω, C = 0.1µF) (Figure 2)
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
V
= V = +3.6V
ON_K
3
µA
ON_K
BAT
L
L
Turn-On Delay Time
Turn-On Rise Time
Turn-Off Delay Time
Turn-Off Fall Time
t
From any enable high to V = 10% of V
BAT
600
1800
130
60
2600
5000
300
µs
µs
µs
µs
ONDLY
IN
t
V
10% to 90% of V
BAT
500
ONRISE
OFFDLY
IN
t
From any enable low to V = 90% of V
IN BAT
t
V
90% to 10% of V
BAT
150
OFFFALL
IN
Note 2: Devices are tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Typical Operating Characteristics
(V = +3.6V, T = +25°C, unless otherwise noted.)
IN
A
NORMALIZED R vs. V
NORMALIZED R vs. TEMPERATURE
TA THRESHOLD vs. V
IN
ON
IN
ON
1.5
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2.50
2.25
2.00
1.75
1.50
1.25
1.00
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
T
A
= +25°C
T
= -40°C
A
A
T
= +85°C
I = 100mA
L
V
BAT
= +3.0V
I = 100mA
L
2.2
3.3
4.4
5.5
-40
-15
10
35
60
85
2.2
3.3
4.4
5.5
V
IN
(V)
TEMPERATURE (°C)
V (V)
IN
ON_K THRESHOLD vs. V
S_EN THRESHOLD vs. V
IN
IN
3.010
1.25
1.15
1.05
0.95
T
A
= -40°C
T
= +25°C
A
3.005
3.000
2.995
2.990
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
0.85
0.75
T
A
= +85°C
2.2
3.3
4.4
5.5
2.2
3.3
4.4
5.5
V
(V)
V (V)
IN
IN
_______________________________________________________________________________________
3
Battery Switch with Four Enable Inputs
Typical Operating Characteristics (continued)
(V = +3.6V, T = +25°C, unless otherwise noted.)
IN
A
BAT CURRENT vs. VOLTAGE
TURN-ON TIME vs. V
TURN-ON DELAY vs. V
IN
IN
3.5
1200
1000
800
4.0
3.2
2.4
1.6
T
= -40°C
A
2.8
2.1
1.4
T
= +25°C
A
T
A
= +85°C
MAX1425
T
A
= +85°C
T
A
= +25°C
600
T
= +85°C
A
T
A
= -40°C
T
A
= +25°C
0.7
0
400
200
0.8
0
R = 20Ω
C = 0.1μF
L
R = 20Ω
L
C = 0.1μF
L
L
T
A
= -40°C
2.2
3.3
4.4
5.5
2.2
3.3
4.4
5.5
2.2
3.3
4.4
5.5
V
BAT
(V)
V
(V)
V (V)
IN
IN
TURN-OFF TIME vs. V
TURN-OFF DELAY vs. V
IN
IN
180
160
140
120
80
72
64
56
T
= +85°C
A
T
= +85°C
A
T
A
= +25°C
T
A
= +25°C
T
A
= -40°C
100
80
48
40
T
A
= -40°C
R = 20Ω
C = 0.1μF
L
R = 20Ω
L
C = 0.1μF
L
L
2.2
3.3
4.4
5.5
2.2
3.3
4.4
5.5
V
IN
(V)
V (V)
IN
TURN-ON RESPONSE
TURN-OFF RESPONSE
MAX14525 toc12
MAX14525 toc11
V
JIG
1V/div
V
IN
1V/div
V
JIG
1V/div
V
= +3.6V
V
= +3.6V
BAT
L
BAT
L
V
C = 0.1μF
C = 0.1μF
IN
1V/div
R = 20Ω
L
R = 20Ω
L
400μs/div
400μs/div
4
_______________________________________________________________________________________
Battery Switch with Four Enable Inputs
MAX1425
OFF
ON
OFF
ON_K INPUT
DETECTOR
A
THRESHOLD
HYSTERESIS
B
RELEASED
THRESHOLD
V
BAT
IN
GND
Figure 1. ON_K Input Operation Diagram
V
IN
90% V
BAT
10% V
BAT
TIME
V
V
V
V
JIG
ON_K
TA
S_EN
TIME
t
OFFDLY
t
t
t
OFFFALL
ONRISE
ONDLY
Figure 2. Turn-On Delay Time, Turn-On Rise Time, Turn-Off Delay Time, and Turn-Off Fall Time
_______________________________________________________________________________________
5
Battery Switch with Four Enable Inputs
Pin Description
PIN
1
NAME
BAT
FUNCTION
Lithium-Ion (Li+) Battery Connection
2
JIG
Enable Input with Standard Logic Threshold
Enable Input with Accurate Threshold (+3.0V)
3
ON_K
S_EN
GND
TA
4
Enable Input with Standard Logic Threshold Logically ANDed with IN
5
Ground
6
Enable Input with High Threshold
MAX1425
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.
7, 8
—
IN
EP
Exposed Pad. Connect EP to ground. Do not use EP as the only ground connection.
until the battery threshold is above +3.0V 2%. When
Detailed Description
the battery has a very low charge and the on key is
The MAX14525 features a low 35mΩ (typ) R
load
ON
pressed, the accurate threshold does not allow the
phone to boot up.
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.
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).
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).
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
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
and 2/3 of V
.
BAT
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
Chip Information
PROCESS: CMOS
6
_______________________________________________________________________________________
Battery Switch with Four Enable Inputs
MAX1425
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
21-0168
8 TDFN-EP
T822+2
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.
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