Linear Technology DC1920A Guida rapida alla configurazione

dc1920af

DEMO MANUAL DC1920A

DESCRIPTION

LTC3553EUD-2

Micropower USB Power Manager with

Li-Ion Charger, Always-On LDO and Buck Regulator

Demonstration circuit DC1920A is a micropower USB

power manager with Li-ion charger, buck DC/DC, and

always-on LDO regulator featuring the LTC

3553EUD-2. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

QUICK START PROCEDURE

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

SYMBOL PARAMETER CONDITIONS MIN MAX UNITS

VBUS Bus Input Voltage Range 4.35 5.5 V

V(BAT) Battery Float Voltage Constant Voltage Mode 4.15 4.23 V

I(BAT) Battery Charge Current Constant Current Mode, RPROG = 1.87k 380 420 mA

VLDO LDO Output Voltage I(VLDO) ≤ 150mA 3.25 3.35 V

VBUCK Buck Regulator Output Voltage I(VBUCK) ≤ 200mA 1.15 1.25 V

Refer to Figure 1 for the proper measurement equipment

setup and jumper settings and follow the procedure below.

NOTE: When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the VBUS

or VOUT(x) and GND terminals. See Figure 2 for proper

scope probe technique.

1. Set PS1 = 0V, PS2 = 3.6V. Application of power to BAT

(PS2), causes a POR. As shown in Figure 5 of the data

sheet, the POR causes the LTC3553EUD-2 to enter the

PDN1 state. In the PDN1 state VLDO is on, and VBUCK

is off. After 1s, the LTC355EUD-2 transitions to the Hard

Reset (HR) state. In HR VLDO is off, and total current

draw from the battery is less than 1µA.

2. Press “REGS ON” button for > 0.5 seconds. Observe

I(BAT) (AM2), VBUCK (VM5) and VLDO (VM6). Press-

ing the “REGS ON” button for > 0.5 seconds causes

the LTC3553EUD-2 to enter the PUP1 state. In the

PUP1 state both regulators are on. After 5 seconds,

the LTC3553EUD-2 enters the PON state. Observe

VLDO (VM6). VLDO is always-on, and is 3.3V. The

LTC3553EUD-2 is in standby mode which reduces

the battery current to less than 15µA, even with both

regulators running. In standby mode the maximum

current from the buck regulator is reduced to 10mA.

Since BUCK_ON (pin 7) on the LTC3553EUD-2 is pulled

up by the buck output, the buck regulator will remain

on, and at 1.2V.

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dc1920af

DEMO MANUAL DC1920A

QUICK START PROCEDURE

3. Set STBY (JP6) to “OFF”, and observe I(BAT) (AM2)

and VPROG (VM2). The LTC3553EUD-2 is now oper-

ating in normal mode drawing more current from the

battery. However the buck regulator is now capable of

delivering up to 200mA, VLDO can deliver 150mA in

either standby or normal mode.

4. Set PS1 to 5V. Observe I(VBUS) (AM1), I(BAT) (AM2)

and VPROG (VM2). Since VBUS is now available, the

battery charger is operating, but chargecurrent is limited

by the input current limit to 100mA (max.).

5. Set HPWR (JP2) to “500mA”. Observe I(VBUS) (AM1),

I(BAT) (AM2) and VPROG (VM2). The input current limit

is now 500mA (max.) so the battery charger is deliver-

ing the full programmed charge current of ~400mA to

the battery.

6. Set LD2 to 200mA, LD3 to 150mA. Observe VBUCK

(VM5), VLDO (VM6) and I(BAT) (AM2). The buck

regulator is supplying 200mA, and the always-on LDO

is supplying 150mA. At ~90% efficiency the buck

regulator is drawing ~50mA and the LDO is drawing

150mA from the VBUS supply. So, the battery charger

is delivering approximately 250mA. This is because the

input current limit is 450mA – 150mA – 50mA = 250mA.

7. Set LD2 to 0A, LD3 to 0A and PS1 to 0V. Press “Buck

OFF” button. Observe VBUCK (VM5) and VLDO (VM6).

The buck regulator is now off. To turn off the LDO hold

down the ON button for at least 14 seconds. This puts

the LTC3553EUD-2 in “Hard Reset” and shuts off the

LDO.

8. Reset the Jumpers to their default position.

Note: All connections from equipment should be Kelvin

connected directly to the board pins which they are con-

nected on this diagram (Figure 1) and any input or output

leads should be twisted pair.

LTC3553 Product Options (for Reference only)

Part Number LDO PGOOD Hard Reset Time

LTC3553 On/Off Control No 5 Seconds

LTC3553-2 Always On Yes 14 Seconds

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dc1920af

DEMO MANUAL DC1920A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup for DC1920A

Figure 2. Measuring Input or Output Ripple

–

+–

VM2

VM3

AM2

3.6

VM4

VM6

VM5

+–

AM1

VM1

+–

PS1

4.35V - 5.5V SUPPLY

–PS2

0V - 5V SUPPLY

–

AM3

+–

LD2

0V - 5V

–

AM4

+–

LD3

0V - 5V

–

GND

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dc1920af

DEMO MANUAL DC1920A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C2, C7, C10 CAP, CHIP, X5R, 10F, ±20%, 6.3V, 0603 TDK, C1608X5R0J106K

2 1 C4 CAP, CHIP, X5R, 4.7F, ±20%, 4V, 0402 MURATA, GRM155R60G475M

3 1 C5 CAP, CHIP, X5R, 1F, ±10%, 10V, 0402 MURATA, GRM155R61A105KE15D

4 1 C6 CAP, CHIP, C0G, 10pF, ±5%, 50V, 0402 MURATA, GRM1555C1H100JZ01D

5 1 C9 CAP, CHIP, X5R, 2.2F, ±20%, 6.3V, 0402 MURATA, GRM155R60J225ME15D

6 1 L1 IND, SMT, 10H, 459m, ±20%, 0.631A, 2mm ×2mm COILCRAFT, EPL2014-103MLC

7 1 R3 RES, CHIP, 1.87k, ±1%, 1/16W, 0402 VISHAY, CRCW04021K87FKED

8 2 R7, R11 RES, CHIP, 100k, ±1%, 1/16W, 0402 VISHAY, CRCW0402100KFKED

9 3 R8, R10, R17 RES, CHIP, 0 JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

10 2 R11, R14 RES, CHIP, 649k, ±1%, 1/16W, 0402 VISHAY, CRCW0402649KFKED

11 1 R12 RES, CHIP, 2.05M, ±1%, 1/16W, 0402 VISHAY, CRCW04022M05FKED

12 1 R15 RES, CHIP, 332k, ±1%, 1/16W, 0402 VISHAY, CRCW0402332KFKED

13 1 U1 MICROPOWER USB POWER MANAGER WITH LI-ION

CHARGER, LDO AND BUCK REGULATOR

LINEAR TECH., LTC3553EUD-2

Additional Demo Board Circuit Components

1 1 C1 CAP, CHIP, X5R, 10F, ±20%, 6.3V, 0603 TDK, C1608X5R0J106K

2 0 C3-OPT CAP, CHIP, C0G, 1pF, ±5%, 50V, 0402 VISHAY, VJ0402A1R0JXAA

3 1 C8 CAP, CHIP, X5R, 100F, ±20%, 6.3V, 1206 MURATA, GRM31CR60J107ME39L

4 1 D1 LED, GREEN, 0603 LITE-ON, LTST-C190KGKT

5 4 R1, R19-R21 RES, CHIP, 1, ±5%, 1/16W, 0402 VISHAY, CRCW04021R00JNED

6 3 R2, R18, R23 RES, CHIP, 100k, ±5%, 1/16W, 0402 VISHAY, CRCW0402100KJNED

7 1 R4 RES, CHIP, 10k, ±5%, 1/16W, 0402 VISHAY, CRCW040210K0JNED

8 1 R5 RES, CHIP, 510k, ±5%, 1/16W, 0402 VISHAY, CRCW0402510KJNED

9 0 R6 RES, CHIP, 1M, ±5%, 1/16W, 0402 VISHAY, CRCW04021M00JNED

10 2 R13, R16 RES, CHIP, 20, ±5%, 1/16W, 0402 VISHAY, CRCW040220R0JNED

11 1 R22 RES, CHIP, 1k, ±5%, 1/10W, 0603 VISHAY, CRCW06031K00JNED

Hardware For Demo Board Only

1 11 E1-E2, E7-E11,

E13-E14, E16-E17

TURRET, 0.09 DIA MILL-MAX, 2501-2-00-80-00-00-07-0

2 6 E3-E6, E12, E15 TURRET, 0.061” MILL-MAX, 2308-2-00-80-00-00-07-0

3 1 J1 CONN, USB MINI-B TYCO, 1734035-2

4 0 J2-OPT CONN, 3 PIN POLARIZED HIROSE, DF3-3P-2DSA

5 7 JP1-JP7 HEADER, 3 PIN, 2mm SAMTEC, TMM-103-02-L-S

6 7 JP1-JP7 SHUNT, 2mm SAMTEC, 2SN-BK-G

7 2 PB1, PB2 SWITCH, N.O. MOMENTARY, 3.5mm × 6mm SMT PANASONIC, EVQPPFA25

8 4 STAND-OFF, NYLON, 0.375” KEYSTONE, 8832

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dc1920af

DEMO MANUAL DC1920A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

4 4

3 3

1 1

500mA

STBY

150mA

HPWR

OPT

OFF

3.3V

OFF

INT

NTC

100mA

EXT

SUSP

200mA

1.2V

VOUT

PBSTAT

VBUCK

REGSON

VBUCK OFF

VFLOAT = 4.2V

BUCK_ON

OPEN

VBUCK

OPT

500mA

VOUT

PGOOD

VLDO

UNLESS NOTED:

RESISTORS: OHMS, 0402, 1%, 1/16W

CAPACITORS: uF, 0402, 10%, 50V

GEORGE B.PRODUCTION FAB

-109-15-11

REVISION HISTORY

ETADNOITPIRCSED APPROVEDECO REV

DC1920A

MICROPOWER USB POWER MANAGER

N/A

LTC3553EUD-2

GEORGEB.

09-15-11

WITH LI-ION CHARGER, LDO AND BUCK REGULATOR

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone:(408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TODESIGNA

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

VOUT

VBUS

VBUCK VOUT

VBUS

VOUT

VLDO

VBUCK

VOUT

VLDO

PROG

JP6

E15 CHRG

10uF

0603

6.3V E17 VOUT

2.9V - 5.5V

0.5A

PB2

R11

649k

1uF

10V

USB MINI-B

VBUS

D-

D+

GND

4.7uF

JP3

R17

R14

649k

510k

R21

1.0

E14 BAT

E9 VINLDO

100uF

6.3V

1206

20%

E10GND

LTC3553EUD-2

HPWR

GND

PBSTAT

LDO

LDO_FB

PGOOD

BUCK_ON

VINLDO

BVIN

CHRG

NTC

PROG

GND

BUCK_FB

STBY

BAT

VOUT

SUSP

VBUS

TP1 D-

R16

E8 VLDO

10uH

EPL2014-103MLC

C10

10uF

0603

6.3V

R18

100K

1.87k

R19

1.0

4.35V - 5.5V

VBUS

10pF

JP5

TP5

OPT

1.0

R15

332k

10uF

0603

6.3V

E7 GND

R23

100K

100k

JP7

CHRG

BUCK_ON

E11 VBUCK

GND

E13GND

1pF

100k

E16GND

E12PGOOD

TP4

2.2uF

6.3V

0402

20%

TP2 D+

100k

JP1

10k

R12

2.05M

JP4

R13

R10

PB1

TP3 ID

R22

DF3-3P-2DSA

3BAT

GND

ENTC

JP2

R20

1.0

10uF

0603

6.3V

PBSTAT

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dc1920af

DEMO MANUAL DC1920A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

LT 0112 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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