AAT1142
800mA Voltage-Scaling Step-Down Converter
Electrical Characteristics1
L = 2.2µH, CIN = COUT = 10µF, VIN = 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are
at TA = 25°C.
Symbol
Description
Conditions
Min Typ Max Units
EN/SET and MODE/SYNC
VEN/SET(L)
VEN/SET(H)
TEN/SET(L)
TEN/SET(H)
TOFF
Enable Threshold Low
0.6
V
V
Enable Threshold High
EN/SET Low Time
EN/SET High Time
EN/SET Timeout
1.4
0.3
VEN/SET < 0.6V
VEN/SET > 1.4V
VEN/SET < 0.6V
VEN/SET > 1.4V
VIN = VFB = 5.5V
75
75
µs
µs
µs
µs
µA
50
500
500
1.0
TLATCH
EN/SET Latch Timeout
Input Low Current
IEN/SET
-1.0
VIN
0.4
×
VMODE/SYNC(L) Enable Threshold Low
VMODE/SYNC(H) Enable Threshold High
V
VIN
0.7
-1.0
×
V
IMODE/SYNC
Input Low Current
1.0
µA
Characteristics of SDA and SCL Bus Lines
Standard Mode
Fast Mode
Parameter
Symbol
Min
Max
Min
Max
Units
SCL Clock Frequency
fSCL
100
400
kHz
µs
Hold Time for START Condition; After
this Period, the First Clock Pulse is
Generated
tHD;STA
4.0
0.6
LOW Period of the SCL Clock
HIGH Period of the SCL Clock
Set-up Time for a Repeated START
Condition
tLOW
tHIGH
4.7
4.0
4.7
1.3
0.6
0.6
µs
µs
µs
tSU;STA
Data in Hold Time
tHD;DAT
tSU;DAT
tSU;STO
tBUF
0
3.45
0
0.9
µs
ns
µs
µs
Data in Set-Up Time
350
4.0
4.7
350
0.6
1.3
Set-Up Time for STOP Condition
Bus Free Time Between a STOP and
START Condition
Input Low Level
VIL
VIH
VIN · 0.3
VIN · 0.3
V
V
Input High Level
VIN · 0.7
VIN · 0.7
1. The AAT1142 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured
by design, characterization, and correlation with statistical process controls.
1142.2006.07.1.0
5
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
