LTC3808EGN#PBF datasheet, PDF - EEWORLD Datasheet

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LTC3808EGN#PBF: DescriptionIC REG CTRLR BUCK 16SSOP; 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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LTC3808EGN#PBF Overview

IC REG CTRLR BUCK 16SSOP

LTC3808EGN#PBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	SSOP
package instruction	SSOP, SSOP16,.25
Contacts	16
Manufacturer packaging code	GN
Reach Compliance Code	compliant
ECCN code	EAR99
Other features	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.6V TO 9.8V
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	R-PDSO-G16
JESD-609 code	e3
length	4.89 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	1 A
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Encapsulate equivalent code	SSOP16,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	250
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	825 kHz
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	0.635 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.899 mm
Base Number Matches	1

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 769

SYNCHRONOUS STEP-DOWN CONVERTER WITH OUTPUT TRACKING

LTC3808EDE

DESCRIPTION

Demonstration circuit 769A is a high efficiency synchro-

nous step-down DC/DC converter with output tracking

and spread spectrum functions featuring the

LTC3808EDE controller. The demo board is capable of

providing 5A output current at 5V input. Burst

mode/Pulse skipping/Forced continuous operation is

selectable. The constant frequency current mode archi-

tecture with MOSFET V

sensing eliminates the need for

sense resistor and improves efficiency. The maximum

peak current sense threshold can be easily selected with

IPRG pin (See the table on the board).

Switching frequency is internally set at 550KHz. The fre-

quency can be adjusted using PLLLPF pin. Tying PLLLPF

pin to GND selects 300KHz operation; tying PLLLPF pin

to V

selects 750KHz operation. The switching frequency

can also be externally synchronized from 250KHz to

850KHz using SYNC terminal (JP5 selected).

The demo board can be selected to operate in spread

spectrum mode (JP2 selected) with significantly reduced

EMI noise.

The demo board has tracking function, allowing Vout to

track an external voltage signal at TRACK terminal dur-

ing start-up (JP6: Track).

Design files for this circuit board are available. Call

the LTC factory.

Table 1. Performance Summary (T

= 25°C)

PARAMETER

Input Voltage Range

OUT

Maximum load current I

OUT

Typical Output Ripple Voltage

Typical Switching Frequency

Typical Spread Spectrum Frequency Range

= 2.7-8V, I

OUT

= 0A to 5A

= 5V, V

OUT

= 1.8V

= 3.3V, I

OUT

= 3A, Fs=550KHz (20MHz BW)

PLLLPF Pin Floating; JP4 selected

JP2 selected (Spread Spectrum)

CONDITION

VALUE

2.7V to 8V

1.8V ±2.5%

23mV

P–P

550kHz

460kHz- 635kHz

QUICK START PROCEDURE

Demonstration circuit 769A is easy to set up to evaluate

the performance of LTC3808. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below: (Initial jumper positions: JP3 se-

lected; JP6: 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

NOTE:

When

voltage ripple by touching the probe tip directly across

the Vin or Vout and GND terminals. See Figure 2 for

proper scope probe technique.

With power off, connect the input power supply to

+Vin (2.7V-8V) and GND (input return).

Connect the 1.8V load between Vout and GND (Initial

load: 0 A).

LTC3808EGN#PBF Related Products

	LTC3808EGN#PBF	DC769A	LTC3808EGN#TRPBF	LTC3808EDE#PBF	LTC3808EDE#TRPBF
Description	IC REG CTRLR BUCK 16SSOP	board eval for ltc3808ede	IC REG CTRLR BUCK 16SSOP	IC REG CTRLR BUCK 14-DFN	IC REG CTRLR BUCK 14-DFN
Brand Name	Linear Technology	-	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	conform to	-	conform to	conform to	conform to
Maker	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	SSOP	-	SSOP	DFN	DFN
package instruction	SSOP, SSOP16,.25	-	SSOP,	HVSON, SOLCC14,.12,20	HVSSON,
Contacts	16	-	16	14	14
Manufacturer packaging code	GN	-	GN	DE	DE
Reach Compliance Code	compliant	-	compliant	compliant	compliant
ECCN code	EAR99	-	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	-	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER
control mode	CURRENT-MODE	-	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Maximum input voltage	9.8 V	-	9.8 V	9.8 V	9.8 V
Minimum input voltage	2.75 V	-	2.75 V	2.75 V	2.75 V
Nominal input voltage	4.2 V	-	4.2 V	4.2 V	4.2 V
JESD-30 code	R-PDSO-G16	-	R-PDSO-G16	R-PDSO-N14	R-PDSO-N14
JESD-609 code	e3	-	e3	e3	e3
length	4.89 mm	-	4.89 mm	4 mm	4 mm
Humidity sensitivity level	1	-	1	1	1
Number of functions	1	-	1	1	1
Number of terminals	16	-	16	14	14
Maximum operating temperature	70 °C	-	70 °C	70 °C	70 °C
Maximum output current	1 A	-	1 A	1 A	1 A
Package body material	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	-	SSOP	HVSON	HVSSON
Package shape	RECTANGULAR	-	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH	-	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	250	-	260	250	260
Certification status	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	-	1.75 mm	0.8 mm	0.8 mm
surface mount	YES	-	YES	YES	YES
Switch configuration	PUSH-PULL	-	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	825 kHz	-	825 kHz	825 kHz	825 kHz
Temperature level	COMMERCIAL	-	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	Matte Tin (Sn)	-	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	-	GULL WING	NO LEAD	NO LEAD
Terminal pitch	0.635 mm	-	0.635 mm	0.5 mm	0.5 mm
Terminal location	DUAL	-	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	-	30	NOT SPECIFIED	30
width	3.899 mm	-	3.899 mm	3 mm	3 mm
Base Number Matches	1	-	1	1	-

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