LTC3548EDD(RevA) View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC3548EDD
(Rev.:RevA)

Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

Linear Technology 

LTC3548

TYPICAL APPLICATIO S

1mm Profile Core and I/O Supplies

VIN = 3.6V

TO 5.5V

C1*

10μF

VOUT2 = 3.3V

AT 400mA

L2

4.7μH

C5, 68pF

RUN2 VIN RUN1

MODE/SYNC

POR

LTC3548

SW2

SW1

R5

100k

POWER-ON

RESET

L1

2.2μH

C4, 33pF

C3

4.7μF

R4

887k R3

196k

VFB2

GND

VFB1

R2

R1 604k

301k

C1, C2: MURATA GRM219R60J106KE19

C3: MURATA GRM219R60J475KE19

L1: COILTRONICS LPO3310-222MX

L2: COILTRONICS LPO3310-472MX

*IF C1 IS GREATER THAN 3" FROM POWER SOURCE,

ADDITIONAL CAPACITANCE MAY BE REQUIRED.

Efficiency vs Load Current

100

95

3.3V

90

85

1.8V

80

75

70

65

VIN = 5V

Burst Mode OPERATION

NO LOAD ON OTHER CHANNEL

60

1

10

100

LOAD CURRENT (mA)

1000

3548 TA08

VOUT1 = 1.8V

AT 800mA

C2

10μF

3548 TA07

3548fa

14

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