LTC3737EGN#TRPBF datasheet, PDF

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LTC3737EGN#TRPBF: DescriptionIC REG CTRLR BUCK 24SSOP; CategoryPower/power management The power supply circuit; File Size184KB，5 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC3737EGN#TRPBF Overview

IC REG CTRLR BUCK 24SSOP

LTC3737EGN#TRPBF 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,
Contacts	24
Manufacturer packaging code	GN
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	DUAL 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-G24
JESD-609 code	e3
length	8.649 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	24
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	1 A
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	SINGLE
Maximum switching frequency	825 kHz
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	30
width	3.899 mm

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 664

2-PHASE DUAL STEP-DOWN CONVERTER WITH OUTPUT TRACKING

LTC3737EUF

DESCRIPTION

Demonstration circuit 664 is a high efficiency 2-phase

dual step-down DC/DC converter with 2.75V to 9.8V

input range. It has two outputs: 2.5V/2.5A and

1.8V/3A. The demo board features the constant fre-

quency current mode LTC®3737EUF controller. The

MOSFET V

sensing eliminates the need for sense

resistors and improves efficiency. Out of phase op-

eration significantly reduces input ripple current and

noise as well as the input capacitor size.

Switching frequency is internally set at 550KHz. For

noise sensitive applications, the converter can be ex-

Table 1. Performance Summary (T

= 25°C)

PARAMETER

Input Voltage Range

OUT1

= 2.75V to 9.8V, I

OUT1

= 0A to 2.5A,

OUT2

= 0A to 3A

OUT2

= 2.75V to 9.8V, I

OUT1

= 0A to 2.5A,

OUT2

= 0A to 3A

Typical Output Ripple V

OUT1

Typical Output Ripple V

OUT2

Typical Switching Frequency

= 3.3V, I

OUT1

= 2.5A (20MHz BW)

= 3.3V, I

OUT2

= 3A (20MHz BW)

PLLLPF Pin Floating

14mV

P–P

19mV

P–P

550kHz

1.8V ±3%

CONDITION

VALUE

2.75V to 9.8V

2.5V ±3%

ternally synchronized from 250KHz to 850KHz. The

frequency can also be selected with PLLLPF pin. Ty-

ing PLLLPF pin to GND selects 300KHz operation;

tying PLLLPF pin to VIN selects 750KHz operation.

The demo board has tracking function, allowing V

OUT2

to track V

OUT1

during start-up.

Design files for this circuit board are available. Call

the LTC factory.

LTC is a trademark of Linear Technology Corporation

QUICK START PROCEDURE

Demonstration circuit 664 is easy to set up to evalu-

ate the performance of LTC3737. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

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 out-

put 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

With power off, connect the input power supply to

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

Connect the 2.5V load (Load 1 in Figure 1) between

Vout1 and GND; connect the 1.8V load (Load 2 in

Figure 1) between Vout2 and GND. (Initial loads:

0A.)

Connect the DVMs to the input and outputs.

Turn on the input power supply and check for the

proper output voltages. Vout1 should be 2.5V+/-

3%. Vout2 should be 1.8V+/-3%.

LTC3737EGN#TRPBF Related Products

	LTC3737EGN#TRPBF	LTC3737EGN#TR	LTC3737EUF#TR	DC664A	LTC3737EUF#PBF	LTC3737EGN#PBF	LTC3737EUF#TRPBF
Description	IC REG CTRLR BUCK 24SSOP	IC reg ctrlr buck pwm CM 24-ssop	IC reg ctrlr buck pwm CM 24-qfn	board eval for ltc3737euf	IC REG CTRLR BUCK 24QFN	IC REG CTRLR BUCK 24SSOP	IC REG CTRLR BUCK 24QFN
Brand Name	Linear Technology	Linear Technology	Linear Technology	-	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	conform to	incompatible	incompatible	-	conform to	conform to	conform to
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	SSOP	SSOP	QFN	-	QFN	SSOP	QFN
package instruction	SSOP,	SSOP,	HVQCCN,	-	HVQCCN, LCC24,.16SQ,20	SSOP, SSOP24,.24	HVQCCN,
Contacts	24	24	24	-	24	24	24
Manufacturer packaging code	GN	GN	UF	-	UF	GN	UF
Reach Compliance Code	compliant	_compli	compli	-	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99	-	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	-	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER	DUAL SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	-	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	9.8 V	9.8 V	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	2.75 V	2.75 V
Nominal input voltage	4.2 V	4.2 V	4.2 V	-	4.2 V	4.2 V	4.2 V
JESD-30 code	R-PDSO-G24	R-PDSO-G24	S-PQCC-N24	-	S-PQCC-N24	R-PDSO-G24	S-PQCC-N24
JESD-609 code	e3	e0	e0	-	e3	e3	e3
length	8.649 mm	8.649 mm	4 mm	-	4 mm	8.649 mm	4 mm
Humidity sensitivity level	1	1	1	-	1	1	1
Number of functions	1	1	1	-	1	1	1
Number of terminals	24	24	24	-	24	24	24
Maximum operating temperature	70 °C	70 °C	70 °C	-	70 °C	70 °C	70 °C
Maximum output current	1 A	1 A	1 A	-	1 A	1 A	1 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	SSOP	HVQCCN	-	HVQCCN	SSOP	HVQCCN
Package shape	RECTANGULAR	RECTANGULAR	SQUARE	-	SQUARE	RECTANGULAR	SQUARE
Package form	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	-	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	260	235	235	-	260	260	250
Certification status	Not Qualified	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	1.75 mm	0.8 mm	-	0.8 mm	1.75 mm	0.8 mm
surface mount	YES	YES	YES	-	YES	YES	YES
Switch configuration	SINGLE	SINGLE	SINGLE	-	SINGLE	SINGLE	SINGLE
Maximum switching frequency	825 kHz	825 kHz	825 kHz	-	825 kHz	825 kHz	825 kHz
Temperature level	COMMERCIAL	COMMERCIAL	COMMERCIAL	-	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	Matte Tin (Sn)	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)	-	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	NO LEAD	-	NO LEAD	GULL WING	NO LEAD
Terminal pitch	0.635 mm	0.635 mm	0.5 mm	-	0.5 mm	0.635 mm	0.5 mm
Terminal location	DUAL	DUAL	QUAD	-	QUAD	DUAL	QUAD
Maximum time at peak reflow temperature	30	20	20	-	30	30	NOT SPECIFIED
width	3.899 mm	3.899 mm	4 mm	-	4 mm	3.899 mm	4 mm

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