FAN5355 データシートの表示（PDF） - Fairchild Semiconductor

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FAN5355

1A / 0.8A, 3MHz Digitally Programmable TinyBuck™ Regulator

Fairchild Semiconductor 

Electrical Specifications (Continued)

VIN = 3.6V, EN = VIN, VSEL = VIN, SYNC = GND, VSEL0(6) bit = 1, CONTROL2[4:3] = 00. TA = -40°C to +85°C, unless otherwise

noted. Typical values are at TA = 25°C. Circuit and components according to Figure 1.

Symbol Parameter

Conditions

DAC

Resolution

Option 07

All Other Options

Differential Nonlinearity

Monotonicity Assured by Design

Timing

I2CEN

EN HIGH to I2C Start

tV(L-H)

VOUT LOW to HIGH Settling

Soft-Start

RLOAD = 75Ω, Transition from 1.0 to 1.5375V

VOUT Settled to within 2% of Setpoint

tSS

VSLEW

Regulator Enable

to Regulated

VOUT

Option 06

All Other

Options

Soft-start VOUT Slew Rate(12)

RLOAD > 5Ω, to VOUT = 1.8000V

RLOAD > 5Ω, to VOUT = Power-up Default

Note:

12. Option 06 slew rate is 35.5V/ms during the first 16μs of soft-start.

Min. Typ. Max. Units

7

Bits

6

Bits

0.8

LSB

250

μs

7

μs

170

210

140

180

18.75

μs

μs

V/ms

AVIN

EN

VSEL

SYNC

SDA

SCL

I2C

INTERFACE

AND LOGIC

3 MHz Osc

Q1

7-bit REF

DAC

SOFT START

Q2

FPWM MODULATOR

EN_REG

CLK

Figure 4. Block Diagram

PVIN

VIN

CIN

SW

L OUT

VOUT

COUT

PGND

VOUT

AGND

© 2008 Fairchild Semiconductor Corporation

7

FAN5355 • Rev. 1.0.4

www.fairchildsemi.com

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