LTC3835-1 Linear Technology, LTC3835-1 Datasheet

LTC3835-1

Manufacturer Part Number

LTC3835-1

Description

Low IQ Synchronous Step-Down Controller

Manufacturer

Linear Technology

Datasheet

1.LTC3835-1.pdf (28 pages)

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FEATURES

APPLICATIONS

TYPICAL APPLICATION

Automotive Systems

Telecom Systems

Battery-Operated Digital Devices

Distributed DC Power Systems

Wide Output Voltage Range: 0.8V ≤ V

Low Operating I

OPTI-LOOP

±1% Output Voltage Accuracy

Wide V

Phase-Lockable Fixed Frequency 140kHz to 650kHz

Dual N-Channel MOSFET Synchronous Drive

Very Low Dropout Operation: 99% Duty Cycle

Adjustable Output Voltage Soft-Start or Tracking

Output Current Foldback Limiting

Output Overvoltage Protection

Low Shutdown I

Selectable Continuous, Pulse-Skipping or

Burst Mode

Small 16-Lead Narrow SSOP or 3mm × 5mm

DFN Package

33k

20k

62.5k

0.01μF

330pF

Range: 4V to 36V Operation

Compensation Minimizes C

Operation at Light Loads

100pF

: 80μA

: 10μA

PLLLPF

RUN

TRACK/SS

SGND

PLLIN/MODE

SENSE

High Efﬁ ciency Step-Down Converter

LTC3835-1

–

BOOST

INTV

PGND

OUT

0.22μF

4.7μF

OUT

≤ 10V

3.3μH

0.012Ω

10μF

DESCRIPTION

The LTC

ing regulator controller that drives an all N-channel synchro-

nous power MOSFET stage. A constant-frequency current

mode architecture allows a phase-lockable frequency of

up to 650kHz.

The 80μA no-load quiescent current extends operating

life in battery powered systems. OPTI-LOOP compensa-

tion allows the transient response to be optimized over

a wide range of output capacitance and ESR values. The

LTC3835-1 features a precision 0.8V reference and a power

good output indicator. The 4V to 36V input supply range

encompasses a wide range of battery chemistries.

The TRACK/SS pin ramps the output voltage during start-

up. Current foldback limits MOSFET heat dissipation during

short-circuit conditions.

Comparison of LTC3835 and LTC3835-1

PART #

LTC3835

LTC3835-1

L, LT, LTC, LTM, Burst Mode, and OPTI-LOOP are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 5408150, 5481178, 5705919, 5929620, 6304066,

6498466, 6580258, 6611131.

38351 TA01

3835-1 is a high performance step-down switch-

150μF

3.3V

4V TO 36V

OUT

Step-Down Controller

CLKOUT/

PHASMD

YES

Low I

100

EXTV

0.001

YES

Efﬁ ciency and Power Loss

0.01

= 12V; V

Synchronous

vs Load Current

0.1

LOAD CURRENT (mA)

OUT

PGOOD

YES

= 3.3V

LTC3835-1

EFFICIENCY

POWER LOSS

GN16/3 × 5 DFN

FE20/4 × 5 QFN

100 1000 10000

PACKAGES

38351 TA01b

100000

10000

38351fc

1000

100

0.1

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