Rainbow Electronics MAX14525 User Manual

General Description

The MAX14525 features a low RON35mΩ (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) RONLoad 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

Pin Configuration

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.

BAT

Li-ION

BATTERY

ON_K

ON

BUTTON

TA

JIG

P

S_EN

MAX14525

3.0V

SLEW RATE

2V

CONTROL

GND

TOP VIEW

IN

CHARGER

PHONE
LOADS

AC

ADAPTER

BAT

JIG

ON_K

S_EN

+

1

2

MAX14525

3

4

*EP

TDFN-EP

2mm x 2mm

*CONNECT EXPOSED PAD TO GND.

IN

8

IN

7

TA

6

GND

5

MAX14525

Battery Switch with Four Enable Inputs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

BAT

= +2.2V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V

BAT

= +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 (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

PARAMETER

CONDITIONS

DC CHARACTERISTICS

Input Voltage Range

2.2 5.5 V

On-Resistance R

ON

I

LOAD

= 100mA, V

BAT

= +3.0V 35 90 mΩ

Disable Supply Current

V

BAT

= +5.5V

(V

JIG

= V

S_EN

= V

ON_K

= VTA = VIN = 0)

1µA

V

BAT

Supply Current I

BAT

V

JIG

= V

S_EN

= V

BAT

, V

ON_K

= VTA = 0 0.8 4.5 µA

Increase in Supply Current with
V

JIG/VS_EN

Voltage

ΔI

BAT

V

JIG

= V

S_EN

= VIH or V

IL

2µA

Increase in Supply Current with
V

ON_K

Voltage

ΔI

BAT

V

BAT

= V

ON_K

= +3.6V 4.5 µA

Peak Current I

LIM

V

BAT

= +3.6V 5 A

UVLO Undervoltage Lockout Ramping V

BAT

1.9 V

LOGIC INPUT

TA Threshold Voltage V

TA_TH

1.7 2.5 V

TA Threshold Hysteresis 1%

TA Input Resistance VTA = 1V 50

kΩ

JIG, S_EN Input Logic-High V

IH

1.4 V

JIG, S_EN Input Logic-Low V

IL

0.4 V

JIG, S_EN Input Leakage Current

I

IN

V

BAT

= +5.5V

nA

IN AND Gate Threshold Voltage V

IN_TH

0.3 x

0.6 x
V

ON_K Threshold Voltage

Low-to-high transition
(Figure 1)

3.0

V

ON_K Threshold Hysteresis 1%

SYMBOL

V

, V

BAT

IN

I

BAT_DIS

MIN TYP MAX UNITS

V

ON_K_TH

1.15

100 180

-200 +200

V

BAT

2.94

V

BAT

3.06

MAX14525

Battery Switch with Four Enable Inputs

_______________________________________________________________________________________ 3

PARAMETER

CONDITIONS

ON_K Input Leakage Current I

ON_K

V

BAT

= V

ON_K

= +3.6V 3 µA

SWITCH DYNAMICS (RL = 20Ω, CL = 0.1µF) (Figure 2)

Turn-On Delay Time t

ONDLY

µs

Turn-On Rise Time

VIN 10% to 90% of V

BAT

µs

Turn-Off Delay Time

From any enable low to VIN = 90% of V

BAT

µs

Turn-Off Fall Time

VIN 90% to 10% of V

BAT

60

µs

ELECTRICAL CHARACTERISTICS (continued)

(V

BAT

= +2.2V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V

BAT

= +3.6V and TA= +25°C.)

(Note 2)

Note 2: Devices are tested at T

A

= +25°C. Specifications over temperature are guaranteed by design.

Typical Operating Characteristics

(VIN= +3.6V, TA= +25°C, unless otherwise noted.)

NORMALIZED RON vs. V

IN

MAX14525 toc01

VIN (V)

I

L

= 100mA

NORMALIZED R

ON

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 R

ON

-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
V

BAT

= +3.0V

SYMBOL

From any enable high to VIN = 10% of V

t

ONRISE

t

OFFDLY

t

OFFFALL

BAT

MIN TYP MAX UNITS

600 2600

500 1800 5000

130 300

150

TA THRESHOLD vs. V

2.50

2.25

2.00

TA = +25°C

IN

TA = -40°C

MAX14525 toc03

3.010

ON_K THRESHOLD vs. V

3.005

3.000

ON_K THRESHOLD (V)

2.995

2.990

TA = -40°C

2.2 5.5

1.75

TA THRESHOLD (V)

1.50

1.25

1.00

2.2 5.5

IN

TA = +25°C

TA = +85°C

4.43.3

VIN (V)

1.25

MAX14525 toc04

1.15

1.05

0.95

S_EN THRESHOLD (V)

0.85

0.75

S_EN THRESHOLD vs. V

TA = -40°C

TA = +25°C

TA = +85°C

2.2 5.5

4.43.3

VIN (V)

TA = +85°C

4.43.3

VIN (V)

IN

MAX14525 toc05