LTC3788GN-1 Linear Technology Corporation, LTC3788GN-1 Datasheet

LTC3788GN-1

Manufacturer Part Number

LTC3788GN-1

Description

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC3788EGN-1-PB.pdf (30 pages)

Specifications of LTC3788GN-1

Case

SSOP

Date_code

09+

Current page: 1 of 30
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APPLICATIONS

TYPICAL APPLICATION

FEATURES

Synchronous Operation for Highest Efﬁ ciency and

Reduced Heat Dissipation

Wide Input Range: 4.5V to 38V (40V Abs Max) and

Operates Down to 2.5V After Start-Up

Output Voltages Up to 60V

±1% 1.2V Reference Voltage

100% Duty Cycle Capability for Synchronous MOSFET

Low Quiescent Current: 125μA

Phase-Lockable Frequency (75kHz to 850kHz)

Programmable Fixed Frequency (50kHz to 900kHz)

Adjustable Output Voltage Soft-Start

Power Good Output Voltage Monitor

Low Shutdown Current I

Internal LDO Powers Gate Drive from VBIAS or EXTV

Available in a Narrow SSOP Package

Industrial

Automotive

Medical

Military

12V AT 5A

SENSE

OUT

110k

220μF

or Inductor DCR Current Sensing

3mΩ

12.1k

1.25μH

2.7k

15nF

0.1μF

: < 8μA

0.1μF

100pF

4.7μF

TG1

BOOST1

SW1

BG1

SENSE1

VFB1

FREQ

PLLIN/MODE

ITH1

SS1 SGND SS2

VBIAS

–

LTC3788-1

INTV

SENSE2

BOOST2

PGND

4.7μF

VFB2

ITH2

SW2

0.1μF

BG2

TG2

–

OPERATES THROUGH TRANSIENTS DOWN TO 2.5V

0.1μF

220pF

4.5V TO 12V START-UP VOLTAGE

8.66k

15nF

Synchronous Boost Controller

3.3μH

12.1k

4mΩ

232k

DESCRIPTION

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

trademarks and No R

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

including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.

The LTC

synchronous boost converter controller that drives all

N-channel power MOSFETs. Synchronous rectiﬁ cation

increases efﬁ ciency, reduces power losses and eases

thermal requirements, allowing the LTC3788-1 to be used

in high power boost applications.

A constant-frequency current mode architecture allows

a phase-lockable frequency of up to 850kHz. OPTI-LOOP

compensation allows the transient response to be optimized

over a wide range of output capacitance and ESR values.

The LTC3788-1 features a precision 1.2V reference and a

power good output indicator. A 4.5V to 38V input supply

range encompasses a wide range of system architectures

and battery chemistries.

Independent SS pins for each controller ramp the output

voltages during start-up. The PLLIN/MODE pin selects

among Burst Mode operation, pulse-skipping mode or

continuous inductor current mode at light loads.

For a leadless 32-pin QFN package with additional features

of adjustable current limit, clock out, phase modulation

and two PGOOD outputs, see the LTC3788 data sheet.

37881 TA01a

220μF

24V AT 3A

OUT

220μF

3788-1 is a high performance 2-phase dual

2-Phase, Dual Output

SENSE

and ThinSOT are trademarks of Linear Technology Corporation.

100

0.00001

Efﬁ ciency and Power Loss

0.0001 0.001

vs Load Current

OUTPUT CURRENT (A)

0.01

Burst Mode OPERATION

FIGURE 9 CIRCUIT

OUT

= 12V

= 24V

LTC3788-1

0.1

37881 TA01b

1000

100

0.1

10000

37881fa

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