LTC3836EGN-PBF datasheet(1/28 Pages) LINER

Part #	LTC3836EGN-PBF

Description	Dual 2-Phase, No RSENSETM Low VIN Synchronous Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3836

1

3836fa

FEATURES

APPLICATIONS

DESCRIPTION

Dual 2-Phase,

No RSENSETM Low VIN

Synchronous Controller

The LTC®3836 is a 2-phase dual output synchronous

step-down switching regulator controller with tracking

that drives external N-channel power MOSFETs using few

external components. The constant-frequency current

mode architecture with MOSFET VDS sensing eliminates

the need for sense resistors and improves efﬁciency.

The power loss and noise due to the ESR of the input

capacitance are minimized by operating the two control-

lers out-of-phase. Pulse-skipping operation provides high

efﬁciency at light loads. The 97% duty cycle capability

provides low dropout operation, extending operating time

in battery-powered systems.

The operating frequency is selectable from 300kHz to

750kHz, allowing the use of small surface mount induc-

tors and capacitors. For noise sensitive applications, the

LTC3836 operating frequency can be externally synchro-

nized from 250kHz to 850kHz.

The LTC3836 features an internal 1ms soft-start that can

be extended with an external capacitor. A tracking input al-

lows the second output to track the ﬁrst during start-up.

The LTC3836 is available in the tiny thermally enhanced

(4mm × 5mm) QFN and 28-lead narrow SSOP packages.

High Efﬁciency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter

n No Current Sense Resistors Required

n Out-of-Phase Controllers Reduce Required Input

Capacitance

n All N-Channel Synchronous Drive

n VIN Range: 2.75V to 4.5V

n Constant-Frequency Current Mode Operation

n 0.6V ±1.5% Voltage Reference

n Low Dropout Operation: 97% Duty Cycle

n True PLL for Frequency Locking or Adjustment

n Selectable Pulse-Skipping/Continuous Operation

n Tracking Function

n Internal Soft-Start Circuitry

n Power Good Output Voltage Monitor

n Output Overvoltage Protection

n Micropower Shutdown: IQ = 6.5μA

n Tiny Low Proﬁle (4mm × 5mm) QFN and Narrow

SSOP Packages

n General Purpose 3.3V to 1.X Supplies

n Single Lithium-Ion Powered Devices

n Distributed DC Power Systems

SENSE1+

VIN

LTC3836

SGND

SENSE2+

BOOST1

BOOST2

TG1

TG2

SW1

SW2

BG1

BG2

PGND

VFB1

VFB2

820pF

VOUT1

1.8V AT

15A

VOUT2

1.2V AT

15A

100μF

× 2

100μF

× 2

15k

820pF

15k

59k

118k

59k

0.47μH

ITH1

3836 TA01

ITH2

22μF

× 3

VIN

3.3V

Efﬁciency/Power Loss vs Load Current

LOAD CURRENT (mA)

30

90

100

20

10

80

50

70

60

40

100

1000

100000

10000

3836 TA01b

0

10000

10

100

1000

1

10

3.3V-1.2V

POWER LOSS

CIRCUIT OF FIGURE 15

3.3V-1.2V

EFFICIENCY

3.3V-1.8V

EFFICIENCY

3.3V-1.8V

POWER LOSS

TYPICAL APPLICATION

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No RSENSE

is a trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners. Protected by U.S. Patents including 5481178, 5929620, 6144194, 6304066,

6498466, 6580258, 6611131.

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