Linear Technology DEMO CIRCUIT 1324A Bedienungsanleitung

PDC

DESCRIPTION

Demonstration Circuit 1324A is a monolithic 400mA

Buck regulator, with fixed output, and two 150mA,

Low Drop Out linear regulators. These are housed in

an 8 lead, 2mm X 2mm DFN package.

Design files for this circuit board are available. Call

the LTC factory.

L, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered

trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy

Drive, FilterCAD, Hot Swap, LinearView, μModule, Micropower SwitcherCAD, Multimode

Dimming, No Latency ΔΣ, No Latency Delta-Sigma, No RSENSE, Operational Filter, PanelProtect,

PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT,

UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names

may be trademarks of the companies that manufacture the products.

PERFORMANCE SUMMARY

Specifications are at T

= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN

Input voltage 2.9 5.5 V

VOUT1 Output of regulator (buck) 1 I

OUT1

≤ 400mA 1.17 1.23 V

VOUT2

Output of LDO1 I

OUT2

≤ 150mA. Subject to dropout limitations. 2.73 2.87 V

VOUT3

Output of LDO2 IOUT3 ≤ 150mA

1.755 1.845 V

OPERATING PRINCIPLES

The LTC3672BEDC-2 is a monolithic fixed output,

400mA, synchronous buck regulator and two 150mA

LDOS.

VOUT1 is driven by a high efficiency synchronous buck

regulator with a fixed output of 1.2V. The buck regulator

on the LTC3672BEDC-2 operates at approximately

2.25MHz, allowing the use of small inductors and

capacitors.

The two fixed output LDOs, have a maximum dropout

voltage of 250mV, over process and temperature. This

allows all three outputs to remain in regulation with VIN

as low as 2.98V.

All of the regulators on the LTC3672BEDC-2 are enabled

via the ENALL pin, controlled by JP1.

DEMO CIRCUI

1324

QUICK START GUID

LTC3672BEDC-2: Monolithi

Fixed-Output 400mA Buck Regulator with Dual

150mA LDOs in 2mm X 2mm DFN

Efficiency of the Buck regulator at VIN = 3.6V

LTC3672BEDC-1

VOUT = 1.2V

100

0 100 200 300 400

LOAD CURRENT [mA]

Efficiency [%]

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1324A

FIXED-OUTPUT 400MA BUCK REGULATOR WITH DUAL 150MA LDOS

LTC3672BEDC-2

Figure 1: Test Equipment Hookup Diagram

Connect test equipment as shown in Figure 1.

Set PS1 = 0V, set PS1 Ilimit = 1A, set LD1 =

0A, LD2 = 0A, LD3 = 0A, and JP1 = ON.

Slowly increase PS1 and verify that all

regulators are operational at VIN ≥ 2.9V.

Set PS1 = 3.6V, and JP1 = ON. Verify VM2 =

1.17V~1.23V, VM3 = 1.755V ~ 1.845V, and

VM4 = 2.73V~2.87V.

Set PS1 = 2.9V, LD1 = 400mA. Verify VM2 =

1.17V~1.23V.

Set LD2 = 150mA, LD3=150mA. Verify that

VM3 = 1.755V~1.845V, and VM4 =

2.65~2.87V.

Set PS1 = 5.5V, and repeat step 5.

Set JP1 = OFF, set PS1 = 2.9V, verify that all

output voltages (VM2-4) are 0V.

Set PS1 = 5.5V, verify that all output voltages

(VM2-4) are 0V.

Set PS1 = 0V, set JP1 = ON.

LD2

0V-5V

+ 1

+ -

AM1

VM2

PS1

0V-6V 2A Supply

+ LD1

0V-5V

LD3

0V-5V

+ 1A

+ -

AM2

+ -

AM3

VM3

VM4

VM1

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1324A

FIXED-OUTPUT 400MA BUCK REGULATOR WITH DUAL 150MA LDOS

LTC3672BEDC-2

Oscillograph 1:Startup from ENALL

Oscillograph 3:Startup from VIN

Oscillograph 2:Shutdown from ENALL

Oscillograph 4:Shutdown from VIN

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1324A

FIXED-OUTPUT 400MA BUCK REGULATOR WITH DUAL 150MA LDOS

LTC3672BEDC-2

APPLICATIONS INFORMATION

There are several components that are only necessary

under certain conditions. C1, C3, and R1, need to be

used as follows.

The connection of VIN to an operating supply may

have significant parasitic inductance. When this

connection is made to the DC1324A PCB, the supply

must charge up the local decoupling capacitance, C2.

A current is established in the connecting leads, while

this capacitor is charging. This current acts as a step

load to induce ringing in the connection. This ringing

may cause the voltage at VIN to rise to up to 2X the

supply voltage, possibly damaging devices, including

the LTC3672BEDC-2, on the DC1324A board. To

prevent this, the damping network composed of

C1&R1 has been added. R1 serves to reduce the Q of

the resonant circuit, and reduces overshoot on VIN

from resonant ringing. C1 blocks the DC voltage,

preventing R1 from consuming any DC current.

If the connection between VIN and the power supply is

very short, and has very low parasitic inductance, there

is no need for this damping circuit, and it may be

omitted. This is usually the case when the

LTC3672BEDC-2 resides on the same PCB as the

source of the VIN voltage. Please be careful with

battery wiring that supplies VIN, as this may also have

significant parasitic inductance.

C3 provides a decoupling function, in the event that

some parasitic resistance and inductance exists

between VIN and VIN1. This impedance can be

problematic when the LTC3672BEDC-2 is supplying

current to loads that contain high speed transients. If,

in the application, a direct connection is made to VIN1,

then it is unlikely that C3 will be needed.

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1324A

FIXED-OUTPUT 400MA BUCK REGULATOR WITH DUAL 150MA LDOS

LTC3672BEDC-2

Figure 2: Schematic of DC1324A: LTC3672BEDC-2 Monolithic Fixed-Ouput 400mA Buck Regulator with Dual

150mA LDOs in 2mm X 2mm DFN

10uF

0603

6.3V E9 GND

OPT

1.8V

150mA

10uF

0603

6.3V

Note1: Subject to the dropout limitations of LDO2 (VOUT3)

E10

400mA

1.2V

E5 GND

GND

1.0

0402

VOUT2

LTC3672BEDC-2

GND

ENALL

BUCKOUT

VIN1

LDO1

LDO2

VIN

GND1

2.2uF

0402

2.8V

150mA

2.2uF

0402

VOUT1

ENALL

OFF

E7 GND

VOUT3

4.7uH

EPL2014-472MLC

GND

JP1

2.2uF

6.3V

0402

VIN E1

2.9V - 5.5V

ENALL

10uF

0603

6.3V

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1324A

FIXED-OUTPUT 400MA BUCK REGULATOR WITH DUAL 150MA LDOS

LTC3672BEDC-2

Table 2: Bill Of Materials

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