LTC1703| Datasheet

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LTC1703 Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

FEATURES

DESCRIPTIO

Side 1 Output Is Compliant with Intel Mobile VID Specifications (Includes 5-Bit DAC) 0.9V to 2.0V Output Voltage with 25mV/50mV Steps Two Sides Run Out-of-Phase to Minimize CIN Precision Internal 0.8V 1% Reference Two Independent PWM Controllers in One Package All N-Channel External MOSFET Architecture No External Current Sense Resistor 550kHz Switching Frequency Minimizes External Component Size Very Fast Transient Response Up to 25A Output Current per Channel Low Shutdown Current: < 100uA Small 28-Pin SSOP Package

APPLICATIO S

Mobile Pentium III Processor Systems Microprocessor Core and I/O Supplies Multiple Logic Supply Generator High Efficiency Power Conversion

, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

The LTC 1703 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. The LTC1703 includes digital output voltage adjustment on side 1 that conforms to the Intel Mobile VID specification. It uses a constantfrequency, true PWM design switching at 550kHz, minimizing external component size and cost and optimizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents. The LTC1703 features an onboard reference trimmed to 1% and delivers better than 1.5% regulation at the converter outputs. An optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each cha
nnel can be enabled independently; with both channels disabled, the LTC1703 shuts down and supply current drops below 100uA.

TYPICAL APPLICATIO
VOUT1 0.9V TO 2V 15A L1 1uH QT1

Dual Output Mobile Pentium III Processor Supply
DCP1 MBR0520LT1 1uF DCP2 MBR0520LT1

QT2 L2 2.2uH

LTC1703 COUT1 180uF 4V 6 QB1A 1 2 QB1B CCP1 1uF 3 4 5 RIMAX1,18.7k 6 7 8 9 10 C21 C11 11 15pF 220pF 12 13 R31, 10k 14 VID0 VID1 VID2 VID3 VID4 28 PVCC IMAX2 27 BOOST1 BOOST2 26 BG1 BG2 25 TG1 TG2 24 SW1 SW2 23 IMAX1 PGND 22 FCB FAULT 21 RUN/SS1 RUN/SS2 20 COMP1 COMP2 19 SGND FB2 18 FB1 VCC 17 VID4 SENSE 16 VID3 VID0 15 VID2 VID1 CCP2 1uF

+

QB2 RIMAX2 20k

GND

CSS1 0.22uF

R21 100k C31 220pF

R22, 100k C22 15pF

1uF

L1: MURATA LQT12535C1R5N12 L2: COILTRONICS UP2B-2R2 QT1, QB1A, QB1B: INTERNATIONAL RECTIFIER IRF7811 QT2, QB2: 1/2 FAIRCHILD NDS8926

U
VIN 4.5V TO 5.5V

U

U

+

CIN 150uF 10V 2 VOUT2 1.5V 3A

+

COUT2 180uF 4V

C32 2200pF R12 10.2k 0.1% R32 1k 10

RB2 11.5k 0.1% C12 220pF

GND GND

1703 TA01

CSS2 0.22uF

1703fa

1

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LTC1703 DATASHEET