600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
Electrical Characteristics
1
T
A
= -40°C to +85°C, unless otherwise noted. V
IN
= V
CC
= 3.6V; typical values are T
A
= 25°C.
Symbol
V
IN
V
UVLO
V
OUT
V
DACIN
I
Q
I
SHDN
I
LIM
R
DS(ON)H
R
DS(ON)L
R
DS(ON)BP
I
LXLEAK
ΔV
OUT
/V
OUT
ΔV
OUT
/
V
OUT
*ΔV
IN
R
OUT
V
OUT
F
OSC
T
SD
T
HYS
I
LL
t
VOUTS
AAT1171
Description
Input Voltage
UVLO Threshold
UVLO Hysteresis
V
OUT
Programmable Range
Input Voltage Range from DAC
Quiescent Current
Shutdown Current
P-Channel Current Limit
High Side Switch On Resistance
Low Side Switch On Resistance
Bypass Switch Resistance
LX Leakage Current
Load Regulation
Line Regulation
Feedback Impedance
Output Voltage Accuracy
Oscillator Frequency
Over-Temperature Shutdown
Threshold
Over-Temperature Shutdown
Hysteresis
Light Load Load Current Threshold
Output Voltage Settling Time
Conditions
V
IN
Rising
Min
2.7
Typ
2.6
200
Max
5.5
Units
V
V
mV
V
V
µA
µA
A
mΩ
mΩ
mΩ
µA
%
%/V
kΩ
V
MHz
°C
°C
mA
0.6
0.2
No Load, Light Load
No Load, PWM, V
CC
Bias Current
EN = AGND = PGND
T
A
= 25°C
45
420
1.2
1.6
230
230
85
3.6
1.2
70
1.0
V
DAC
= 1.3V or BYPASS = VIN
V
CC
= 5.5V, V
LX
= 0 to V
CC
I
LOAD
= 0 to 500mA
1
0.5
0.2
V
DAC
= 0.6V, I
LOAD
= 0
1.746
170
1.8
2.0
140
15
100
1.854
V
OUT
= 0.6V to V
OUT(MAX)
,
MODE/SYNC = V
IN
30
µs
1. The AAT1171 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.
4
1171.2006.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
