LTC3704| Datasheet

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

LTC3704 Wide Input Range, No RSENSETM Positive-to-Negative DC/DC Controller

FEATURES

DESCRIPTIO

High Efficiency Operation (No Sense Resistor Required) Wide Input Voltage Range: 2.5V to 36V Current Mode Control Provides Excellent Transient Response High Maximum Duty Cycle (Typ 92%) 1% Internal Voltage Reference 2% RUN Pin Threshold with 100mV Hysteresis Micropower Shutdown: IQ = 10A Programmable Switching Frequency (50kHz to 1MHz) with One External Resistor Synchronizable to an External Clock Up to 1.3 fOSC User-Controlled Pulse Skip or Burst Mode Operation Internal 5.2V Low Dropout Voltage Regulator Capable of Operating with a Sense Resistor for High Output Voltage Applications (VDS >36V) Small 10-Lead MSOP Package

The LTC 3704 is a wide input range, current mode, positive-to-negative DC/DC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to high power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET's on-resistance, thereby maximizing efficiency. The IC's operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10A make the LTC3704 ideally suited for battery-operated systems. For applications requiring constant frequency operation, the Burst Mode operation feature can be defeated using the MODE/SYNC pin. Higher than 36V switch voltage applications are possible with the LTC3704 by connecting the SENSE pin to a resistor in the source of the power MOSFET. The LTC3704 is available in the 10-lead MSO
P package.
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. No RSENSE is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5847554, 5731694.

APPLICATIO S

SLIC Power Supplies Telecom Power Supplies Portable Electronic Equipment Cable and DSL Modems Router Supplies

TYPICAL APPLICATIO
R1 1M RUN ITH LTC3704 RC 3k NFB FREQ MODE/SYNC CC1 4.7nF RT 80.6k 1% RFB1 1.21k 1% RFB2 3.65k 1% INTVCC GATE GND SENSE VIN

L1*

VIN 5V to 15V VOUT 5.0V 3A to 5A L2*

CDC 47F

EFFICIENCY (%)

M1 D1 CVCC 4.7F CIN 47F

COUT 100F (X2)

GND
3704 TA01

CIN, CDC : TDK C5750X5R1C476M COUT: TDK C5750X5R0J107M CVCC: TAIYO YUDEN LMK316BJ475ML

D1: MBRD835L (ON SEMICONDUCTOR) L1, L2: BH ELECTRONICS BH510-1009 M1: Si4884 (SILICONIX/VISHAY)

Figure 1. High Efficiency Positive to Negative Supply
3704fb

U
Conversion Efficiency
100 90 80 70 60 VIN = 10V 50 40 30 20 0.001 0.01 1.0 0.1 OUTPUT CURRENT (A) 10
3704 TA01b

U

U

VIN = 5V VIN = 15V

1

LTC3704 Datasheet linear Download PDF

Add this permalink to your bookmarks for future download of LTC3704 datasheet

Permalink: http://datasheet.emcelettronica.com/linear/LTC3704

LTC3704 DATASHEET