LTC3838 datasheet(1/54 Pages) LINER

Part #	LTC3838

Description	Dual, Fast, Accurate Step-Down DC/DC Controller

Download	54 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

Logo

1 / 54 page

LTC3838

1

3838fa

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Dual, Fast, Accurate Step-

Down DC/DC Controller with

Differential Output Sensing

TheLTC®3838isadual,PolyPhase®synchronousstep-down

DC/DC switching regulator controller. Two independent

channelsdriveallN-channelpowerMOSFETs.Thecontrolled

on-time, valley current mode control architecture allows for

fast transient response and constant frequency switching

in steady-state operation, independent of VIN, VOUT and

load current. Its load-release transient detection feature

significantly reduces overshoot at low output voltages.

Differential output voltage sensing, along with a preci-

sion internal reference, offers an accurate ±0.67% output

regulation on Channel 1, even if the remote output ground

deviates from local ground by ±500mV. The second channel

can either provide an independent ±1% output, or together

with the first channel of this controller, serve as one of the

PolyPhase channels for a single-output voltage.

The switching frequency can be programmed from 200kHz

to2MHzwithanexternalresistor,andcanbesynchronizedto

an external clock. Very low tON and tOFF times allow for near

0% and near 100% duty cycles, respectively. Voltage track-

ing soft start-up and multiple safety features are provided.

1.2V/1.5V, 15A, 350kHz, DCR Sense, Step-Down Converter (Refer to Figure 16 for Full Design)

APPLICATIONS

n Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V

n ±0.67% Output Voltage Accuracy Over Temperature,

Differential Output Voltage Sensing, Allowing Up to

±500mV Line Loss at Remote Ground on Channel 1

n ±1% Output on the Independent 2nd Channel

n Controlled On-Time, Valley Current Mode Control

n Fast Load Transient Response

n Detect Transient (DTR) Reduces VOUT Overshoot

n Frequency Programmable from 200kHz to 2MHz,

Synchronizable to External Clock

n tON(MIN) = 30ns, tOFF(MIN) = 90ns

n RSENSE or Inductor DCR Current Sensing

n Overvoltage Protection and Current Limit Foldback

n Power Good Output Voltage Monitor

n Output Voltage Tracking and Adjustable Soft Start-Up

n Thermally Enhanced 38-Pin (5mm

× 7mm) QFN and

TSSOP packages

n Distributed Power Systems

n Point-of-Load Converters

n Computing Systems

n Data Communication Systems

L, LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are registered

trademarks and Hot Swap, No RSENSE and UltraFast are trademarks of Linear Technology

Corporation. All other trademarks are the property of their respective owners. Protected by U.S.

Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611.

115k

SENSE1–

SENSE1+

SENSE2–

SENSE2+

VIN

BOOST1

DRVCC1

TG1

BG1

PGND

BG2

DRVCC2

VOUTSENSE1+

VOUTSENSE1–

TRACK/SS1

ITH1

VFB2

TRACK/SS2

ITH2

4.7μF

VOUT2

1.5V

15A

VIN

4.5V TO 38V

VOUT1

1.2V

15A

0.1μF

330μF

2

330μF

2

10k

15k

10k

0.56μH

3838 TA01a

RT

SGND

SW1

BOOST2

LTC3838

TG2

INTVCC

SW2

+

Efficiency/Power Loss

LOAD CURRENT (A)

0.1

40

80

90

100

1

EFFICIENCY

10

3838 F16b

70

60

50

0

1.5

2.0

2.5

1.0

0.5

VIN = 12V

VOUT = 1.2V

FORCED CONTINUOUS MODE

DISCONTINUOUS MODE

POWER

LOSS

Similar Part No. - LTC3838

Manufacturer	Part #	Datasheet	Description
Linear Technology	LTC3838	696Kb / 50P	Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller
	LTC3838	550Kb / 36P	Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
	LTC3838	5Mb / 52P	Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing
	LTC3838	5Mb / 56P	Dual, Fast, Accurate Step-Down DC/DC Controller with External Reference Voltage
	LTC3838	421Kb / 38P	Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing

More results

Similar Description - LTC3838

Manufacturer	Part #	Datasheet	Description
Linear Technology	LTC3838	726Kb / 54P	Dual, Fast, Accurate Step- Down DC/DC Controller with Differential Output Sensing
	LTC3838-2	5Mb / 56P	Dual, Fast, Accurate Step-Down DC/DC Controller with External Reference Voltage
	LTC3838-1	5Mb / 52P	Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing
	LTC3838-1	5Mb / 52P	Dual, Fast, Accurate Step-Down DC/DC Controller with Dual Differential Output Sensing
	LTC3839	696Kb / 50P	Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller
	LTC3833	523Kb / 36P	Fast Accurate Step-Down DC/DC Controller with Differential Output Sensing
	LTC3838-2	5Mb / 56P	Dual, Fast, Accurate Step-Down DC/DC Controller with xternal Reference Voltage and Dual Differential Output Sensing
	LTC3861-1	1Mb / 38P	Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
	LTC3861	977Kb / 38P	Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing
	LTC3861-1	550Kb / 36P	Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

More results

LTC3838 Datasheet(PDF) 1 Page - Linear Technology

LTC3838 Datasheet(HTML) 1 Page - Linear Technology

Similar Part No. - LTC3838

Similar Description - LTC3838

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

Datasheet Download

Link URL