2
Date: 3/6/06 SP6656, 400mA Synchronous Buck Regulator with Dynamically Adjustable Voltage Output © Copyright 2006 Sipex Corporation
V
IN
= UV
IN
= V
EN
= 3.6V, V
OUT
= V
FB
, I
O
= 0mA, T
AMB
= -40°C to +85°C, typical values at 25°C unless otherwise noted
.
PV
IN
,V
IN
.............................................................................................. 6V
All other pins .............................................................. -0.3V to V
IN
+0.3V
PV
IN
, P
GND
, LX current ........................................................................ 2A
Storage Temperature .................................................. -65 °C to 150 °C
Operating Temperature ................................................. -40°C to +85°C
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at
these ratings or any other above those indicated in the operation sections
of the specifications below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect reliability.
ELECTRICAL CHARACTERISTICS
PARAMETER MIN TYP MAX UNITS CONDITIONS
Input Voltage Operating UVLO 5.5 V
Range
Minimum Output Voltage 1.0 V
FB Set Voltage, Vr 0.784 0.800 0.816 V 25°C, I
O
= 200mA Close Loop. L
I
= 10µH,
C
OUT
= 22µF
Overall Accuracy Measured at V
IN
= 5.5V, no load and
(-40°C to 85°C) ±5%V
IN
=3.6V, 200mA load, Close Loop
(0°C to 70°C) ±4
On-Time Constant - K
ON
1.5 2.25 3.0 V*µsClose Loop, L
I
= 10µH,C
OUT
= 22µF
Min, T
ON
=K
ON
/(V
IN
-V
OUT
)
Off-Time Constant - K
OFF
1.6 2.4 3.2 V*µsInductor current limit tripped, VFB = 0.5V
Min, T
OFF
=K
OFF
/V
OUT
Measured at V
OUT
= 1V
Off-Time Blanking 100 ns
Turn On Time 250 400 µs 400mA Load
PMOS Switch Resistance 0.3 0.6 Ω I
PMOS
= 200mA
NMOS Switch Resistance 0.3 0.6 Ω I
NMOS
= 200mA
Inductor Current Limit 500 625 750 mA VFB = 0.5V
Power Efficiency 96 % V
OUT
= 2.5V, I
O
= 200mA
92 V
OUT
= 3.3V, I
O
= 400mA
Minimum Guaranteed Load 400 500 mA
Current
V
IN
Quiescent Current 20 30 µAV
OUT
= 3.3V, V
IN
= 3.6V and V
IN
= 5.5V
V
IN
Shutdown Current 1 500 nA EN = 0.0V
V
OUT
Quiescent Current 2 5 µAV
OUT
= 3.3V
V
OUT
Shutdown Current 1 500 nA EN = 0.0V
UVLO
Undervoltage Lockout 2.55 2.70 2.85 V EN = V
IN
,
Threshold, V
IN
falling
UVLO hysteresis 40 mV
OVSO Output Voltage 50 100 mV V
IN
= EN; Iovso =1mA; OVSI = 1 = Vcc
OVSO Leakage Current 5 100 nA V
IN
= EN; Vovso= 3.6V;OVSI= 0.0V= GND
Over-Temperature 140 °C
Rising Trip Point
Over-Temperature Hysteresis 14 °C
EN Leakage Current 1 500 nA
EN Input Threshold Voltage 0.60 0.90 V High to Low Transition
1.25 1.8 V Low to High Transition
FB Leakage Current 1 100 nA FB =1V
LX Leakage 3 5 µA EN = 0.0V, V
IN
= 3.6V
LX = 0.0V, LX = V
IN
+ 0.2V
OVSI Leakage Current 1 500 nA
OVSI Input Threshold Voltage 0.60 0.90 V High to Low Transition
1.25 1.8 Low to High Transition
