LTC3809EDD-1#TRPBF datasheet, PDF

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LTC3809EDD-1#TRPBF: DescriptionOutputable current: - Switching operating frequency: 550kHz Output type: Transistor Driver Number of output voltage channels: 1 Function type: Step-Down Output configuration: Positive high-voltage synchronous current mode buck controller; CategoryPower/power management The power supply circuit; File Size195KB，4 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC3809EDD-1#TRPBF Overview

Outputable current: - Switching operating frequency: 550kHz Output type: Transistor Driver Number of output voltage channels: 1 Function type: Step-Down Output configuration: Positive high-voltage synchronous current mode buck controller

LTC3809EDD-1#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	DFN
package instruction	HVQCCN, SOLCC10,.12,20
Contacts	10
Manufacturer packaging code	DD
Reach Compliance Code	compliant
ECCN code	EAR99
Is Samacsys	N
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	9.8 V
Minimum input voltage	2.75 V
Nominal input voltage	4.2 V
JESD-30 code	S-PQCC-N10
JESD-609 code	e3
length	3 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	10
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	1 A
Package body material	PLASTIC/EPOXY
encapsulated code	HVQCCN
Encapsulate equivalent code	SOLCC10,.12,20
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	0.8 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	600 kHz
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	30
width	3 mm
Base Number Matches	1

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 882

SYNCHRONOUS STEP-DOWN CONVERTER WITH OUTPUT TRACKING

LTC3809EDD-1

DESCRIPTION

Demonstration circuit 882 is a small size, low profile,

low cost and high efficiency synchronous step-down

DC/DC converter featuring the LTC3809EDD-1 controller.

The demo board is capable of providing 2A output cur-

rent with 2.75V to 9.8V input range. Burst mode/Pulse

skipping/Forced continuous operation is selectable. The

constant frequency current mode architecture with

MOSFET V

sensing eliminates the need for a sense re-

sistor and improves efficiency. The maximum peak cur-

rent sense threshold can be easily selected with IPRG

pin. Switching frequency is internally set at 550KHz.

The demo board has optional power component foot-

prints to deliver higher output current and a tracking

function, allowing Vout to track an external voltage sig-

nal at the TRACK terminal (JP4: Track).

Design files for this circuit board are available. Call

the LTC factory.

LTC is a trademark of Linear Technology Corporation

Table 1. Performance Summary (T

= 25°C)

PARAMETER

Input Voltage Range

OUT

Maximum load current I

OUT

Typical Output Ripple Voltage

Typical Switching Frequency

= 2.75V-9.8V, I

OUT

= 0A to 2A

= 2.75V-9.8V

= 3.3V, I

OUT

= 2A (20MHz BW)

CONDITION

VALUE

2.75V to 9.8V

1.8V ±2.5%

8mV

P–P

550kHz

QUICK START PROCEDURE

Demonstration circuit 882 is easy to set up to evaluate

the performance of the LTC3809-1. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below: (Initial jumper positions: JP1 se-

lected; JP4: Soft Start)

measuring the input or output voltage rip-

ple, 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 2 for

proper scope probe technique.

NOTE:

When

Connect the 1.8V load between Vout and GND (Initial

load: 0 A).

Connect the DVMs to the input and output.

Turn on the input power supply and check for the

proper output voltage. Vout should be 1.8V+/-2.5%.

Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage and other pa-

rameters.

With power off, connect the input power supply to Vin

(2.75V-9.8V) and GND (input return).

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