Linear DC1735A Kurzanleitung zur Einrichtung

dc1735Af

DEMO MANUAL DC1735A

DESCRIPTION

OPERATING PRINCIPLE

LTC3226EUD

2-Cell Supercap Charger With

Backup PowerPath Controller

Demonstration circuit DC1735A is a 2-cell supercap

charger with a backup PowerPath™ controller, featuring

the LTC

3226. It includes a charge-pump supercapacitor

charger with programmable output voltage, a low drop-

out regulator and a power-fail comparator for switching

between normal and backup modes. The constant-input

current supercapacitor charger is designed to charge two

supercapacitors in series to a resistor programmable out-

put voltage from a 2.5V to 5.3V input supply. The charger

input current limit is programmable by an external resistor

up to 315mA. The internal backup LDO is powered from

The LTC3226 is a 2-cell series supercapacitor charger

designed to back up a Li-ion battery or any system rail in

the range of 2.5V to 5.3V. Its four principle circuit com-

ponents are:

1. Dual (1×/2×) charge pump with an integrated balancer

and a voltage clamp

2. LDO to supply the load current from the charge stored

on the supercapacitors

3. Ideal diode controller to control the gate of the external

MOSFET between VIN and VOUT

4. PFI comparator to decide whether to activate the charge

pump to charge the supercapacitor stack or to activate

the LDO to supply the load when VIN falls below an

externally programmed value.

the supercapacitors and provides up to 2A peak output

current with an adjustable output voltage. When the input

supply falls below the resistor programma-ble power-fail

threshold,theLTC3226 automatically enters a backup state

in which the supercapacitors power the output through

the LDO. The LTC3226 is available in a 16-lead, 3mm ×

3mm QFN surface mount package with an exposed pad.

Design files for this circuit board are available at

http://www.linear.com/demo

The LTC3226 has two modes of operation: normal and

backup. If VIN is above an externally programmable PFI

threshold voltage, the part is in normal mode and power

flows from VIN to VOUT through the external MOSFET while

the internal charge pump chargers the supercapacitor

stack (see Figure 1). If VIN is below the PFI threshold, the

part is in backup mode (see Figure 2). In this mode, the

internal charge pump is turned off and the LDO is turned

on to supply the load current from the stored charge on

the supercapacitor stack.

The device includes three open-drain, output status sig-

nals: CAPGOOD, PFO and RST. The CAPGOOD pin is an

open-drain N-channel MOSFET transistor controlled by a

comparator that monitors the voltage on the supercapaci-

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 2.5 5.5 V

IVIN(ILIM) Input Current Limit RPROG = 33.3k 315 mA

VSTACK Supercap Stack Output Voltage RCP1 = 3.83M, RCP2 = 1.21M 5.3 5.5 V

VMID Supercap Midpoint Voltage 2.65 2.75 V

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dc1735Af

DEMO MANUAL DC1735A

Figure 2. Normal-to-Backup Mode Switchover

tor stack. This pin is pulled to ground until the CPO pin

voltage rises within 7.5% of the programmed value. Once

the CPO pin is above this threshold, the CAPGOOD pin

goes high impedance. The output of the PFI comparator

also drives the gate of an open-drain N-channel MOSFET

to report the status via the PFO pin. In normal mode the

PFO pin is high impedance, but in backup mode the pin

is pulled down to ground. The LTC3226 contains a RESET

comparator which monitors VOUT under all operating

modes via the RST_FB pin and reports the status via an

open-drain NMPS transistor on the RST pin. At any time,

if VOUT falls below 7.5% from its programmed value, it

pulls the RST pin low almost instantaneously.

However, on the rising edge, the comparator waits 290ms

after VOUT crosses the threshold voltage before making

the RST high impedance.

OPERATING PRINCIPLE

VOLTAGE (V) 1V/DIV

dc1735A F01

TIME (5 SECONDS/DIV)

CPO

VIN

VMID

MODE

MODE RPROG = 33.2k

CSC = 1.2F

–1

TIME (SECONDS)

VOLTAGE (V)

1.6

dc1735A F02

–1 0.4 0.8 1.2

CPO

2.0

VOUT

VIN

CSC = 1.2F

COUT = 47μF

ILOAD = 2A

PFO (2V/DIV)

BACKUP

MODE

(LDO IN

REGULATION)

BACKUP MODE

(LDO IN

DROPOUT)

QUICK START PROCEDURE

Refer to Figure 3 for the proper measurement equipment

setupandjumpersettings,andfollowthe 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 VIN

or VOUT and GND terminals. See Figure 4 for the proper

scope probe technique.

1. Initial jumper, power supply and load settings:

JP1 = EN Power Supply = OFF

JP2 = 110mA Load = Off

JP3 = 110mA Pulse Generator = OFF

2. Connect the power supply to the VIN terminals, turn

the power supply on, and increase the voltage to 2V

while monitoring the input current. If the input current

is less than 5mA, increase the voltage until the point at

which PFO goes high. Verify that VIN is between 3.53V

and 3.65V, the input current is approximately 320mA,

the output voltage is approximately equal to the input

voltage and the voltage on the CPO pin is rising.

3. Monitor the voltage on CPO and CAPGOOD. Verify that

CAPGOOD goes high when CPO is at 4.6V and that CPO

charges between 4.83V and 5.23V. Verify that VMID is

one-half of CPO. Verify that RST is high.

Figure 1. Charge Profile with Equal Value Supercapacitors

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dc1735Af

DEMO MANUAL DC1735A

QUICK START PROCEDURE

Figure 3. Proper Measurement Equipment Setup for DC1735A

Figure 4. Measuring Input or Output Ripple

GND

VIN

dc1735a F04

4. Turn on the load and increase the current to 2A. Verify

that VOUT is within 50mV of VIN.

5. Decrease the power supply to 3V and quickly observe

that VOUT is between 3.12V and 3.47V, PFI is low, RST

is high and the voltage on CPO is falling. Increase VIN

to 3.6V and verify that the voltage on CPO starts to

rise again. Let the voltage on CPO rise beyond where

CAPGOOD goes high.

6. TurnoffthepowersupplyandobservethatVOUT remains

between 3.12V and 3.47V for greater than 700ms, and

that VOUT then falls, tracking CPO until VOUT reaches

2.4V. Verify that RST is low.

7. Disconnect thepowersupplyfromtheVIN terminals,turn

down the voltage to 0V and connect the power supply

between the CPO and ground terminals. Slowly increase

the voltage to 5V and verify that VOUT is between 3.12V

and 3.47V. Increase the load on VOUT to 1A. Set up the

pulsegeneratorforanoutputvoltagepeakof10V,apulse

with 1ms pulse width and a period of 20ms. Connect

the pulse generator to the pulse generator terminals and

observe the transient response on the VOUT terminals.

Verify that the negative transition of VOUT is less than

75mV and that it recovers within 100μs.

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dc1735Af

DEMO MANUAL DC1735A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 Cap., Chip, X5R, 4.7μF, 10%, 6.3V, 0603 Murata, GRM188R60J475KE19D

2 1 C3 Cap., Chip, X5R, 2.2μF, 20%, 10V, 0603 Murata, GRM188R61A225KE34D

3 2 C4, C5 Cap., Chip, X7R, 0.1μF, 10%, 16V, 0402 Murata, GRM155R71C104KA88D

41C6 Supercap, 1.2μF, 5.5V, 39mm ×17mm CAP-XX, HS230F

5 1 C7 Cap., Chip, X5R, 47μF, 20%, 6.3V, 1206 Murata, GRM31CR60J476ME19L

7 1 R2 Res., Chip, 210k, 1/16W, 1%, 0402 Vishay, CRCW0402210KFKED

8 1 R3 Res., Chip, 121k, 1/16W, 1%, 0402 Vishay, CRCW0402121KFKED

9 1 R7 Res., Chip, 100k, 1/16W, 1%, 0402 Vishay, CRCW0402100KFKED

10 1 R8 Res., Chip, 3.83M, 1/16W, 1%, 0402 Vishay, CRCW04023M83FKED

11 1 R9 Res., Chip, 1.21M, 1/16W, 1%, 0402 Vishay, CRCW04021M21FKED

12 1 R10 Res., Chip, 255k, 1/16W, 1%, 0402 Vishay, CRCW0402255KFKED

13 1 R11 Res., Chip, 80.6k, 1/16W, 1%, 0402 Vishay, CRCW040280K6FKED

14 1 Q1 MOSFET, –20V, 33mΩ, –5.5A, SUPERSOT-6 Fairchild, FDC604P

15 1 U1 2-Cell Supercapacitor Charger with Backup

PowerPath Controller

Linear Technology, LTC3226EUD

Additional Circuit Components

1 1 C1 Cap., SMD, OSCON, 220μF, 20%, 6.3V,

6.3mm ×6mm

Sanyo, 6VPE220M

2 0 C8 (OPT) Cap., Chip, 0402

3 1 D1 SMD, Switching Diode, SOD323 Vishay, 1N4148WS-V-GS08

4 1 R1 Res., Chip, 1M, 1/16W, 1%, 0402 Vishay, CRCW04021M00FKED

5 1 R4 Res., Chip, 10k, 1/16W, 1%, 0402 Vishay, CRCW040210K0FKED

6 3 R5, R6, R16 Res., Chip, 100k, 1/16W, 1%, 0402 Vishay, CRCW0402100KFKED

7 3 R12 to R14 Res., Chip, 475k, 1/16W, 1%, 0402 Vishay, CRCW0402475KFKED

8 1 R15 Res., Chip, 1k, 1/16W, 1%, 0402 Vishay, CRCW04021K00FKED

9 2 R17, R18 Res., Chip, 6.65Ω, 1/4W, 1%, 1206 Vishay, CRCW12066R65FKED

10 1 Q2 MOSFET, 30V, 65mΩ, 3.5A, SOT-23 Vishay, Si2306BDS

Hardware for Demo Board Only

1 4 E1, E2, E8, E9 Turret, 0.09 DIA Mill-Max, 2501-2

2 12 E3 to E7, E10 to E16 Turret, 0.061 DIA Mill-Max, 2308-2

3 3 JP1 to JP3 Header, 3 Pins, 2mm Samtec, TMM-103-02-L-S

4 3 JP1 to JP3 Shunt 2mm Samtec, 2SN-BK-G

5 4 Stand-Off, Nylon, 0.375" Tall (Snap On) Keystone, 8832 (Snap On)

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dc1735Af

DEMO MANUAL DC1735A

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

Figure 5. Demo Circuit Schematic

ALL CAPACITORS ARE 0402, 10%

1. ALL RESISTORS ARE 0402, 1%, 1/16W

5% DUTY CYCLE

3.3V-5.5V

3.3V - 5.5V

2.0AMAX

2. INSTALL SHUNTS AS SHOWN.

NOTE: UNLESS OTHERWISE SPECIFIED

220mA

110mA

OFF

JP3

330mA

JP2

LIMIT

220mA

LIMIT PROGRAMMING

INPUT CURRENT

DEMO CIRCUIT 1735A

BACKUP POWER PATH CONTROLLER

N/A

LTC3226EUD

JIMD.

05-16-11

2-CELL SUPERCAPACITOR CHARGER WITH

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCBDES.

APPENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas,CA95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGYHASMADE A BESTEFFORT TO DESIGNA

CIRCUIT THAT MEETSCUSTOMER-SUPPLIEDSPECIFICATIONS;

HOWEVER,IT REMAINS THE CUSTOMER'SRESPONSIBILITYTO

VERIFYPROPERAND RELIABLE OPERATIONIN THE ACTUAL

APPLICATION. COMPONENTSUBSTITUTIONAND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLYAFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGYAPPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIEDFOR USE WITHLINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

JIMD.PRODUCTION2 05-16-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PFI

VIN

VOUT

GND

JP1

ENABLE

OFF

VIN

E11VMID

4.7uF

6.3V

X5R

0603

PROG

JP3

110mA

OFF

1.21MEG

PULSE LOAD

1.0Meg

R18

6.65

1206

0.25W

R13

475K

R15

E9 GND

E12GND

100K

2.2uF

10V

X5R

0603

GND

JP2

110mA

OFF

R10

255K

1N4148-SMD

2 1

210K

R14

475K

R16

100K

E13 RST

0.1uF

16V

X7R

R11

80.6K

121K

E16GND

E14 PFO

R17

6.65

1206

0.25W

BAL

1.2F

HS230F

39mmx17mm

220uf

CAP-CV-6.3X6

6.3V

100K

ENABLE

E15CAPGOOD

0.1uF

16V

X7R

GND

R12

475K

10K

Si2306BDS

OPT

FDC604P

2 4

LTC3226EUD

1415

VOUT

PFO

PFI

LDO_FB

GATE

RST_FB

RST

EN_CHG

PROG

CPO_FB

CAPGOOD

C-

VIN

VMIDC+

CPO

GND

3.83MEG

E8 VOUT

E10CPO

47uF

6.3V

X5R

1206

20%

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dc1735Af

DEMO MANUAL DC1735A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0711 • 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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