LTC3858GN-1 Linear Technology Corporation, LTC3858GN-1 Datasheet

LTC3858GN-1

Manufacturer Part Number

LTC3858GN-1

Description

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC3858IUFD-1TRPBF.pdf (36 pages)

Specifications of LTC3858GN-1

Case

SSOP

Date_code

09+

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LTC3858GN-1

Manufacturer:

LTNEAR

Quantity:

20 000

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FEATURES

APPLICATIONS

TYPICAL APPLICATION

OUT1

3.3V

Low Operating I

Wide Output Voltage Range: 0.8V ≤ V

Wide V

Out-of-Phase Controllers Reduce Required Input

Capacitance and Power Supply Induced Noise

OPTI-LOOP

Phase-Lockable Frequency (75kHz-850kHz)

Programmable Fixed Frequency (50kHz-900kHz)

Selectable Continuous, Pulse-Skipping or

Burst Mode

Very Low Dropout Operation: 99% Duty Cycle

Adjustable Output Voltage Soft-Start

Power Good Output Voltage Monitor

Output Overvoltage Protection

Output Latch-Off Protection During Short Circuit

Low Shutdown I

Internal LDO Powers Gate Drive from V

No Current Foldback During Start-Up

Tiny 4mm × 5mm QFN and Narrow SSOP Packages

Automotive Systems

Battery Operated Digital Devices

Distributed DC Power Systems

SENSE

0.007Ω

150μF

3.3μH

62.5k

or DCR Current Sensing

High Efﬁ ciency Dual 8.5V/3.3V Step-Down Converter

Range: 4V to 38V

20k

Compensation Minimizes C

Operation at Light Loads

0.1μF

15k

680pF

: 170μA (One Channel On)

: 8μA

0.1μF

TG1

BOOST1

SW1

BG1

SENSE1

TH1

FB1

SS1

–

LTC3858-1

SGND

INTV

SENSE2

BOOST2

SS2

PGND

SW2

BG2

TG2

TH2

FB2

0.1μF

–

OUT

or EXTV

≤ 24V

15k

680pF

0.1μF

4.7μF

20k

7.2μH

193k

0.01Ω

22μF

50V

DESCRIPTION

The LTC

switching regulator controller that drives all N-channel

synchronous power MOSFET stages. A constant frequency

current mode architecture allows a phase-lockable fre-

quency of up to 850kHz. Power loss and noise due to the

input capacitor ESR are minimized by operating the two

controller outputs out of phase.

The 170μA 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

LTC3858-1 features a precision 0.8V reference and a power

good output indicator. A wide 4V to 38V input supply range

encompasses a wide range of intermediate bus voltages

and battery chemistries.

Independent soft-start pins for each controller ramp the

output voltages during start-up. The output latch-off feature

protects the circuit in short-circuit conditions.

For a leadless 32-pin QFN package with additional features

of adjustable current limit, clock out, phase modulation

and two PGOOD outputs, see the LTC3858 data sheet.

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

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

respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6100678,

6144194, 6177787, 6304066, 6580258.

9V TO 38V

38581 TA01

150μF

8.5V

3.5A

OUT2

3858-1 is a high performance dual step-down

Step-Down Controller

2-Phase Synchronous

100

0.0001

Efﬁ ciency and Power Loss

0.001

vs Load Current

OUTPUT CURRENT (A)

EFFICIENCY

0.01

Low I

FIGURE 12 CIRCUIT

0.1

OUT

LTC3858-1

POWER LOSS

= 12V

= 3.3V

38581 TA01b

, Dual

0.1

10000

1000

100

38581f

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