MAXIM MAX14550E User Manual

19-4745; Rev 2; 1/10

EVALUATION KIT

AVAILABLE

USB Host Charger Identification Analog Switch

General Description

The MAX14550E is a USB Hi-Speed analog switch with a USB host charger (dedicated charger) identification circuit. The MAX14550E supports both the USB Battery Charging Specification Revision 1.0 and a set resistor bias for AppleM-compliant devices.

The MAX14550E features a high-performance Hi-Speed USB switch with low 4pF (typ) on-capacitance and low 4I (typ) on-resistance. In addition, the MAX14550E features two digital inputs (CB0 and CB1) to switch between pass-through and charger modes. The USB host charger identification circuit allows a host USB port to support USB chargers with shorted D+/D- detection and to provide support for Apple-compliant devices using a resistor bias. When an Apple-compliant device is attached to the port, the MAX14550E provides the voltage from the resistor-divider. The MAX14550E uses the internal or external resistor based on the voltage at RDP. If a USB Revision 1.0-compliant device is attached, the MAX14550E connects a short across DP and DM to allow correct charger detection. The MAX14550E autodetection circuit can be disabled and either a DP/DM short or resistor network is chosen as the default.

The MAX14550E has enhanced high electrostatic discharge (ESD) protection on the DP and DM inputs up to Q15kV Human Body Model (HBM).

The MAX14550E is available in a 10-pin (3mm x 3mm) TDFN package and is specified over the -40NC to +85NC extended temperature range.

Features

S USB 2.0 Hi-Speed Switching

S Low 4.0pF On-Capacitance

S Low 4.0ω On-Resistance

S Ultra-Low 0.1ω On-Resistance Flatness

S +2.8V to +5.5V Supply Range

S Ultra-Low 7µA Supply Current

S Automatic USB Charger Identification Circuit

S Optional External Resistor-Divider with Auto

Selection

S ±15kV High ESD HBM Protection on DP/DM

S 3mm x 3mm, 10-Pin TDFN Package

Applications

Laptops

Netbooks

Cell Phones

Ordering Information

PART TEMP RANGE

MAX14550EETB+

+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.

-40NC to +85NC

PIN-

PACKAGE

10 TDFN-EP* AWG

TOP

MARK

MAX14550E

Typical Operating Circuit appears at end of data sheet.

Apple is a registered trademark of Apple, Inc.

_______________________________________________________________ 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.

USB Host Charger Identification Analog Switch

ABSOLUTE MAXIMUM RATINGS

VCC, DP, DM, TDP, TDM, RDP,

RDM, CB_ to GND ...............................................-0.3V to +6V

Continuous Current Into Any Terminal ........................... Q30mA

Continuous Power Dissipation (TA = +70NC)

10-Pin TDFN (derate 24.4mW/NC above +70NC) .......1951mW

Thermal Resistance (Note 1)

Junction-to-Ambient Thermal Resistance (BJA) ...........41NC/W

Junction-to-Case Thermal Resistance (BJC) ..................9NC/W

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

MAX14550E

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.

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

ELECTRICAL CHARACTERISTICS

(VCC = +2.8V to +5.5V, TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Power-Supply Voltage V

Supply Current I

Supply Current Increase Analog Signal Range VDP, V

ANALOG SWITCH

On-Resistance TDP/TDM Switch

On-Resistance Match Between Channels TDP/TDM Switch

R

DR

DI

CC

ONT

VCC = 3.3V

VCC = 5.5V

0V P V

DM

0V P V

P VIL or VIH P V

CB_

P VCC, I

DP/DM

VDP = VDM = 400mV, IDP or IDM = 10mA 0.1

Operating Temperature Range .......................... -40NC to +85NC

Maximum Junction Temperature .....................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Soldering Temperature (Reflow) .......................................260NC

2.8 5.5 V

V

= VCB = V

CB0

V

= 0V, VCB = V

CB0

CC

0.7 2

6.5 10

External resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

7 12

Internal resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

V

= VCB = V

CB0

V

= 0V, VCB = V

CB0

CC

76 120

2.5 7

8.5 15

External resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

9 16

Internal resistors used, V

= VCB = 0V or

CB0

V

= VCC, VCB = 0V

CB0

or IDM = 10mA

DP

CB_

P V

CC

0 V

125 180

2

CC

4 6.5

FA

V

I

2

USB Host Charger Identification Analog Switch

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.8V to +5.5V, TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

On-Resistance Flatness TDP/ TDM Switch

On-Resistance RDP/RDM Switch

On-Resistance Flatness RDP/ RDM Switch

On-Resistance of DP/DM Short

R

FLATT

R

ONR

R

FLATR

R

SHORT

VDP = VDM, 0V P VDP P VCC, IDP = IDM = 10mA

0.4V P V

RDP/RDM

P VCC, I

RDP

= I

10mA

V

= V

RDP

I

= I

RDP

V

= 0V, VCB = VCC, VDP = VDM,

CB0

RDM

, 0.4V P V

= 10mA

RDP

P VCC,

0V P VDP P VCC, IDP = IDM = 1mA

RDM

=

0.1

4 7.5

0.1

50 70

I

MAX14550E

TDP/TDM Off-Leakage Current

DP/DM On-Leakage Current

I

TDPOFF

I

TDMOFF

I

DPON

I

DMON

DYNAMIC PERFORMANCE

Turn-On Time t

Turn-Off Time t

TDP/TDM Switch Propagation Delay

Output Skew Between Switches

TDP/TDM Off-Capacitance C

DP/DM On-Capacitance (Connected to TD_ )

t

PLH

ON

OFF

, t

t

SK(O)

OFF

C

ON

-3dB Bandwidth BW

Off-Isolation V

Crosstalk V

ISO

CT

INTERNAL RESISTORS

DP/DM Short Pulldown R

PD

RP1/RP2 Ratio RT RP1 + RP2 Resistance R

RP

RM1/RM2 Ratio RT RM1 + RM2 Resistance R

RM

RP

RM

,

VCC = 5.5V, V VDM = 5.5V to 0V, V

,

VCC = 5.5V, V

= VCC, VCB = 0V, VDP =

CB0

= V

TDP

TDM

= VCB = VCC,

CB0

VDP = VDM = 5.5V to 0V

V

TDP

or V

= 1.5V, RL = 300I,

TDM

CL = 35pF, VIH = VCC, VIL = 0V, Figure 1

V

TDP

or V

= 1.5V, RL = 300I,

TDM

CL = 35pF, VIH = VCC, VIL = 0V, Figure 1

RL = RS = 50I

PHL

Skew between DP and DM when connected to TDP and TDM, RL = RS = 50I, Figure 2

f = 1MHz, V

BIAS

= 0V, V

SIGNAL

(Note 3)

f = 240MHz, V V

SIGNAL

= 500mV

BIAS

= 0V,

P-P

RL = RS = 50I

V

, VDP = 0dBm, RL = RS = 50I,

TDP

f = 250MHz, Figure 3

V

, VDP = 0dBm, RL = RS = 50I,

TDP

f = 250MHz, Figure 3

= 0V to 5.5V

= 500mV

P-P

-250 +250 nA

20 100

2.5 5

Fs

60 ps

40 ps

2.0 pF

4.0 5.5 pF

1000 MHz

-20 dB

-25 dB

350 500 700

kI

1.485 1.5 1.515 Ratio

93.75 125 156.25

kI

0.854 0.863 0.872 Ratio

69.75 93 116.25

kI

3

USB Host Charger Identification Analog Switch

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +2.8V to +5.5V, TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

COMPARATORS

V

> 0.4V, DM falling 1.9 2.1 2.3 V

DM Comparator Threshold V

DP and RDP Comparator Threshold

MAX14550E

DM Comparator Hysteresis 1 %V

V

DMF

DPR

DP and RDP Comparator Hysteresis

DM Comparator Debounce Time

DP Comparator Debounce Time

t

DM

t

DP

DIGITAL I/O (CB0, CB1)

Input Logic Voltage High V Input Logic Voltage Low V Input Logic Hysteresis V

Input Leakage Current I

IH

IL

HYST

IN

ESD PROTECTION

All Pins Human Body Model

ESD Protection Level (DP and DM Only)

RDP

V

< 0.3V, DM falling 44 45 46 %V

RDP

DP or RDP falling 0.3 0.35 0.4 V

1 %V

VDM from 2.8V to 1.5V 30 100 200

VDP from 0.7V to 0V 30 100 200

1.4 V

0.4 V

100 mV

VCC = 5.5V, 0V P V VIH P V

CB_

P V

CC

Human Body Model

CB_

P VIL or

-250 +250 nA

Q2

Q15

kV

Fs

CC

DMF

DPR

Note 2: All devices are 100% production tested at TA = +25NC. Specifications over temperature are guaranteed by design. Note 3: Guaranteed by design.

Test Circuits/Timing Diagrams

V

CC

tR < 5ns t

< 5ns

F

t

OFF

0.9 x V

OUT

TD_

V

IN

CB0

LOGIC INPUT

C

INCLUDES FIXTURE AND STRAY CAPACITANCE.

L

V

OUT

R

Figure 1. Switching Time

4

= V

GND

IN (

R

L

CB1

+ R

V

MAX14550E

L

)

ON

V

CC

D_

R

L

V

OUT

C

L

LOGIC INPUT

SWITCH OUTPUT

IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.

IH

V

IL

0V

50%

V

OUT

0.9 x V

0UT

t

ON

USB Host Charger Identification Analog Switch

Test Circuits/Timing Diagrams (continued)

MAX14550E

IN+

R

S

R

IN-

S

MAX14550E

TDP

TDM

DP

C

L

DM

C

L

V

CC

RISE TIME DELAY = |t FALL TIME DELAY = |t RISE TIME TO FALL TIME MISMATCH = |t

OUT+

OUT-

INRISE

INFALL

- t

OUTRISE

OUTFALL

|

OUTFALL

- t

OUTRISE

|

CB0 CB1

V

CC

t

INFALL

V

CC

V

IN+

0V

V

CC

V

IN-

0V

50%

90%

10%

t

OUTFALL

t

INRISE

10%

t

OUTRISE

90%

V

CC

V

OUT+

0V

V

CC

V

OUT-

0V

Figure 2. Output Signal Skew

t

SK(0)

50%

90%

10%

90%

10%

5

USB Host Charger Identification Analog Switch

TDP/TDM ON-RESISTANCE

Test Circuits/Timing Diagrams (continued)

V

OUT

V

IN

V

OUT

V

IN

0V OR V

CC

CB1

CB0 V

MAX14550E

V

CC

TDP

DP*

V

IN

V

OUT

MEAS REF

NETWORK

ANALYZER

50I

50I 50I

50I

OFF-ISOLATION = 20log

CROSSTALK = 20log

SWITCH IS ENABLED. MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN TD_ AND "OFF" D_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

*FOR CROSSTALK, THIS PIN IS DM. TDM AND DP ARE OPEN.

Figure 3. Off-Isolation and Crosstalk

Typical Operating Characteristics

(T

= +25°C, unless otherwise noted.)

A

RDP/RDM ON-RESISTANCE

4.5

4.0

3.5

3.0

2.5

(I)

ON

R

2.0

1.5

1.0

0.5

0

0 5.5

VCC = 2.8V

vs. SUPPLY VOLTAGE

TDP/TDM ON-RESISTANCE vs. V

5.0

4.5

4.0

MAX14550E toc01

3.5

3.0

(I)

2.5

ON

VCC = 5.5V

5.04.53.5 4.01.0 1.5 2.0 2.5 3.00.5

V

(V)

TDP

R

2.0

1.5

1.0

0.5

0

0 3.3

TA = +85°C

TA = +25°C

TA = -40°C

V

TDP/TDM

(V)

TDP/TDM

VCC = 3.3V

5.0

4.5

4.0

MAX14550E toc02

3.5

3.0

(I)

2.5

ON

R

2.0

1.5

1.0

0.5

3.02.72.1 2.40.6 0.9 1.2 1.5 1.80.3

0

vs. SUPPLY VOLTAGE

VCC = 2.8V

VCC = 5.5V

V

(V)

RDP

5.55.04.0 4.51.0 1.5 2.0 2.5 3.0 3.50.50 6.0

MAX14550E toc03

6