Dual PWM Step-Down Converter in a 2mm x
2mm Package for WCDMA PA and RF Power
_______________________________________________________________________________________ 3
PARAMETER
CONDITIONS
MIN   TYP   MAX  UNITS
Peak Current Limit (p-Channel
MOSFET)
1200  1450   1700   mA
Valley Current Limit (n-Channel
MOSFET)
1100  1350   1600   mA
Minimum On-Time
70
ns
Minimum Off-Time
50
ns
Power-Up Delay
From V
PAEN
 rising to V
LX1
 rising
50    75    祍
OUT1 REFIN
Common-Mode Range
0.2
1.7    V
REFIN-to-PAOUT Gain
V
REFIN
 = 0.32V or 1.32V, I
LX1
 = 0A
2.45   2.5   2.55
Input Resistance
320
k&
BYPASS
Bypass Mode Threshold
V
REFIN
 falling, 150mV hysteresis
0.396
xV
CC
V
T
A
 = +25癈
0.14
On-Resistance
p-channel MOSFET
I
OUT
 = -90mA
T
A
 = +85癈
0.3
&
Bypass Current Limit
V
PAOUT
= 1.5V
700   1000   1400   mA
Step-Down Current Limit in
Bypass
1200  1450   1700   mA
Total Bypass Current Limit
V
PAOUT
= V
LX1
= 1.5V
1900  2450   3100   mA
T
A
= +25癈
0.01    5
Bypass Off-Leakage Current
V
CC
 = V
IN1
 = 5.5V,
V
PAOUT
 = 0V
T
A
= +85癈
1
OUT2
Output Voltage
I
OUT2
 = 0 to 150mA,
V
IN2
 = V
CC
 = 3.2V to 4.5V
3.038   3.1   3.162   V
T
A
 = +25癈
0.01    5
OUT2 Leakage Current
V
RFEN1
 = V
RFEN2
 = 0
T
A
 = +85癈
0.1
No-Load Supply Current
V
PAEN
 = 0V, I
OUT2
 = 0A, switching
2.5
mA
p-channel MOSFET switch, I
LX2
 = -40mA
300
m&
On-Resistance
n-channel MOSFET rectifier, I
LX2
 = 40mA
300
m&
p-Channel Current-Limit
Threshold
400   450   500   mA
n-Channel Negative Current Limit
400
mA
Maximum Duty Cycle
100
%
Minimum Duty Cycle
16.5
%
PWM Frequency
1.8   2.0    2.2   MHz
Power-Up Delay
From V
RFEN1
 or V
RFEN2
 rising to V
LX2
 rising
35    75    祍
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
IN1
= V
IN2
= V
PAEN
= V
RFEN1
= V
RFEN2
= 3.6V, V
REFIN
= 0.72V, T
A
= -40癈 to +85癈, typical values are at T
A
= +25癈,
unless otherwise noted.) (Note 2)
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