PRODUCT DATASHEET
AAT1276
SwitchRegTM
Boost Converter with USB Power Switch
Electrical Characteristics1
VCC = VIN = 3.6V, VOUT1 = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
Conditions
Min
Typ
Max
Units
VIN, VCC
VOUTx
VUVLO
Operating Input Voltage Range
Maximum Output Voltage Range
Under-Voltage Lockout
2.7
5.0
5.5
2.7
V
V
V
No Load, Switching
No Load, Not Switching, VFB = 1.5V
EN = GND
100
45
IQ
Quiescent Supply Current
Shutdown Current
μA
μA
90
1.0
ISHDN
Boost Converter
IO
ILIMIT
VFB
Continuous Output Current
Input Switch Current Limit
FB Pin Regulation
3V < VIN < 5V, VO = 5V
500
mA
A
V
2.5
0.6
No Load, TA = 25°C
0.591
-3
0.609
3
VOUT
Output Voltage Tolerance
Load Regulation
ILOAD = 0 to 500mA, VIN = 2.7V to 5V
%
ΔVOUT
(VOUT*ΔVIN)
ILOAD = 0 to 500mA
0.005
%/mA
ΔVOUT/VOUT Line Regulation
VIN = 2.7V to 5V
0.2
200
170
170
%/V
mΩ
mΩ
mΩ
RDS(ON)H
RDS(ON)L
RDS(ON)
High Side Switch On Resistance
Low Side Switch On Resistance
Input Disconnect Switch
VOUT1 = 5V, IOUT1 = 500mA
VOUT1 = 5V, IOUT1 = 500mA
VOUT1 = 5V, IOUT1 = 500mA
_
IN
TSS
η
Soft-Start Time
Efficiency
From Enable to Output Regulation
300
90
μs
%
IOUT1 = 250mA, L = 2.2μH, VIN = 3.6V,
VOUT1 = 5V
TA = 25°C, IOUT1 = 500mA, VIN = 3.6V,
VOUT1 = 5V
FOSC
Switching Frequency
2.0
MHz
Load Switch
RDS(ON)
ILIM
Ω
mA
mA
μs
ms
μs
V
μA
ms
Current Limit Switch On Resistance
Current Limit
VOUT1 = 5V, TA = 25°C
RSET = 16.9kΩ
RSET = 40kΩ
0.2
625
500
100
0.4
4
ILIM(MIN)
TRESP
TON
Minimum Current Limit
Current Limit Response Time
Turn-On Delay Time
VOUT1 = 5V
VOUT1 = 5V, RL = 10Ω
VOUT1 = 5V, RL = 10Ω
ISINK = 1mA
VFAULT = 5V
Rising and Falling Edge
TOFF
Turn-Off Delay Time
10
VFLT
FLT Logic Output Low
0.4
1
_
LOW
IFLT
TBLANK
Control
VTH-L
FLT Logic Output High Leakage Current
Fault Blanking Time
0.5
4
EN Threshold Low
0.4
1
V
V
μA
°C
°C
VTH-H
EN Threshold High
1.4
-1
IEN
EN Input Leakage
VEN = 5V, VIN = 5V
TJ-TH
TJ-HYS
TJ Thermal Shutdown Threshold
TJ Thermal Shutdown Hysteresis
140
15
1. The AAT1276 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
tion with statistical process controls.
w w w . a n a l o g i c t e c h . c o m
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1276.2007.11.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
