SP6125 Datasheet, PDF (2/12 Pages) Sipex Corporation – High-Voltage, Step Down Controller in TSOT6

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.
ABSOLUTE MAXIMUM RATINGS
Input Voltage……................................................-0.3V to 30V
Lx………………………………………..………….…-2V to 30V
FB……………....................................................-0.3V to 5.5V
Storage Temperature..……..…………...……-65 °C to 150 °C
Junction Temperature.....................................-40°C to 125°C
Lead Temperature (Soldering, 1…0 sec)….…………..300 °C
ESD Rating……….…….…1kV LX, 2kV all other nodes, HBM
ELECTRICAL SPECIFICATIONS
Specifications are for TAMB=TJ=25°C, and those denoted by ♦ apply over the full operating range, -40°C< Tj <125°C. Unless
otherwise specified: VIN =4.5V to 29V, CIN = 4.7µF.
PARAMETER
UVLO Turn-On Threshold
UVLO Turn-Off Threshold
UVLO Hysterisis
Operating Input Voltage
Range
Operating Input Voltage
Range
Operating VCC Current
Reference Voltage Accuracy
Reference Voltage Accuracy
Reference Voltage
Reference Voltage
Switching Frequency
Peak-to-peak ramp Modulator
Minimum ON-Pulse Duration
Minimum Duty Cycle
Maximum Duty Cycle
Gate Driver Turn-Off
Resistance
Gate Driver Pull-Down
Resistance
Gate Driver Pull-up
Resistance
VIN - VDR voltage difference
Overcurrent Threshold
LX pin Input Current
OFF interval during hiccup
Soft start time
SHDN Threshold
SHDN Threshold Hysteresis
♦ ^{MIN TYP MAX UNITS}
CONDITIONS
4.2 4.35 4.5
V
4.0 4.2 4.4
V
0.2
V
0°C< T_j <125°C
0°C< T_j <125°C
4.5
29
V
0°C< T_j <125°C
7
29
V♦
0.3 3
0.5 1
0.5 2
mA
VFB=1.2V
%
%_♦
0.594 0.6 0.606 V
♦ ^{0.588 0.6 0.612 V}
255 300 345 kHz
VIN/5
V
40 100 ns _♦
0
%
100
%
50 60
kΩ
4
8
Ω
3
6
Ω
Internal resistor between GATE and
VIN
VIN=12V, VFB=0.5V, Measure
resistance between GATE and VDR
VIN=12V, VFB=0.7V, Measure
resistance between GATE and VIN
4.5
5.5
♦ ^V
Measure VIN – VDR, VIN>7V
270 300 330
25 30 35
200
3
5
9
0.9 1.0 1.1
100
mV
Measure VIN - LX
uA
VLX = VIN
ms
ms
VFB=0.58V, measure between
VIN=4.5V and first GATE pulse
♦ ^V
Apply voltage to FB
mV
Jan28-08 RevG
SP6125: TSOT-6 PFET Buck Controller
2
 2007 Exar Corporation