1.2A PWM Step-Down Converter in
2mm x 2mm WLP/UCSP for PA Power
_______________________________________________________________________________________ 3
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
LX
p-channel MOSFET switch, I
LX
= -40mA
0.15
On-Resistance
n-channel MOSFET rectifier, I
LX
= 40mA
0.15
&
T
A
= +25癈
0.1 5
LX Leakage Current
V
IN1A
= V
IN1B
= V
IN2
= 5.5V,
V
LX
= 0V
T
A
= +85癈
1
礎
p-Channel MOSFET Peak
Current Limit
V
LX
= 0V
1.3 1.5 1.8 A
n-Channel MOSFET Valley
Current Limit
1.1 1.3 1.6 A
Minimum On- and Off-Times
0.07
祍
Power-Up Delay
From PA_EN rising to LX rising
80 190 祍
BYPASS
T
A
= +25癈
0.060 0.1
On-Resistance
p-channel MOSFET bypass,
I
PA
= -90mA
T
A
= +85癈
0.1
&
Bypass Current Limit
V
PA
= 0V
0.8 1.4 1.8 A
Total Bypass Current Limit
V
LX
= V
PA
= 0V
2.1 2.9 3.6 A
Bypass Threshold
V
IN2
rising, 150mV hysteresis
0.985 x
V
PA
V/V
T
A
= +25癈
0.01 5
Bypass Off-Leakage Current
V
IN1A
= V
IN1B
= V
IN2
= 5.5V,
V
PAA
= V
PAB
= 0V
T
A
= +85癈
0.1
礎
LDO2
Output Voltage V
LDO2
V
IN2
= 5.5V, I
LDO2
= 1mA;
V
IN2
= 3.4V, I
LDO2
= 1mA
2.765 2.85
2.936 V
Output Current
200
mA
Current Limit
V
LDO2
= 0V
250 550 750 mA
Dropout Voltage
I
LDO2
= 100mA, T
A
= +25癈 (V
LDO2
e 2.5V)
70
mV
Line Regulation
V
IN2
stepped from 3.5V to 5.5V, I
LDO2
= 100mA
2.4
mV
Load Regulation
I
LDO2
stepped from 50礎 to 200mA
25
mV
Power-Supply Rejection
V
LDO2
/V
IN2
10Hz to 10kHz, C
LDO2
= 1礔, I
LDO2
= 30mA
65
dB
Output Noise
100Hz to 100kHz, C
LDO2
= 1礔, I
LDO2
= 30mA
35
礦
RMS
0 < I
LDO2
< 10mA
100
nF
Output Capacitor for Stable
Operation
0 < I
LDO2
< 200mA
1
礔
Shutdown Output Impedance V
EN2
= 0V
1
k&
REFBP
REFBP Output Voltage
0 d I
REFBP
d 1礎
1.237 1.250 1.263 V
REFBP Supply Rejection
V
IN2
stepped from 2.55V to 5.5V
0.2 5 mV
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1A
= V
IN1B
= V
IN2
= V
PA_EN
= V
EN2
= 3.6V, V
HP
= 0V, T
A
= -40癈 to +85癈. Typical values are at T
A
= +25癈, unless otherwise
noted.) (Note 1)
Note 1:All devices are 100% production tested at T
A
= +25癈. Limits over the operating temperature range are guaranteed by design.
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