Down Controller. SP6125 Datasheet

SP6125 Controller. Datasheet pdf. Equivalent


Sipex Corporation SP6125
www.DataSheet4U.com
Solved by
SP6125
TM
High-Voltage, Step Down Controller in TSOT6
FEATURES
Wide 4.5V – 29V Input Voltage Range
Internal Compensation
Built-in High Current PMOS Driver
Adjustable Overcurrent Protection
Internal soft-start
300kHz Constant Frequency Operation
0.6V Reference Voltage
1% output setpoint accuracy
Lead Free, RoHS Compliant Package:
Small 6 pin TSOT
LX GND FB
6 54
SP6125
6 PinTSOT
1 23
VIN GATE VDR
DESCRIPTION
The SP6125 is a PWM controlled step down (buck) voltage mode regulator with VIN feedforward and
internal Type-II compensation. It operates from 4.5V to 29V, making is suitable for 5V, 12V, and 24V
applications. By using a PMOS driver, this device is capable of operating at 100% duty cycle. The
high side driver is designed to drive the gate 5V below VIN. The programmable overcurrent
protection is based on high-side MOSFET’s ON resistance sensing and allows setting the
overcurrent protection value up to 300mV threshold (measured from VIN-LX). The SP6125 is
available in a space-saving 6-pin TSOT package making it the smallest controller available capable
of operating from 24VDC supplies.
TYPICAL APPLICATION CIRCUIT
C6
0.1uF
Q1
2 FDS4685
1
Vin
Gate
Rs 2k
LX
L1, IHLP-2525CZ
8.2uH, 68mOhm, 4A
SP6125
3
VDR
6
Ds RZ
MBRA340T3G 2K
R1
200k, 1%
GND
5
4
VFB
CZ
100pF
R2
44.2k, 1%
SHDN
D1 1N4148
High=Of f
C1
4.7uF
C4
22uF
VIN
C2 24-29 V
4.7uF
GND
VOUT
C5
22uF
3.3V
0-3A
GND
Mar22-07 RevC
SP6125: TSOT-6 PFET Buck Controller
1
2007 Sipex Corporation


SP6125 Datasheet
Recommendation SP6125 Datasheet
Part SP6125
Description Step Down Controller
Feature SP6125; www.DataSheet4U.com Solved by SP6125 TM High-Voltage, Step Down Controller in TSOT6 FEATURES Wide.
Manufacture Sipex Corporation
Datasheet
Download SP6125 Datasheet




Sipex Corporation SP6125
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 <85°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
4.0 4.2 4.4
0.2
V
V
V
0°C< Tj <85°C
0°C< Tj <85°C
4.5
29 V
0°C< Tj <85°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
VIN/5
kHz
V
40 100 ns
100
50
4
3
0
60
8
6
%
%
k
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
359
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
Mar22-07 RevC
SP6125: TSOT-6 PFET Buck Controller
2
2007 Sipex Corporation



Sipex Corporation SP6125
PIN #
1
2
3
4
5
6
PIN
NAME
VIN
GATE
VDR
FB
GND
LX
PIN DESCRIPTION
DESCRIPTION
Input power supply for the controller. Place input decoupling capacitor as close
as possible to this pin.
Connect to the gate terminal of the external P-channel MOSFET.
Power supply for the internal driver. This voltage is internally regulated to
about 5V below VIN. Place a 0.1uF decoupling capacitor between VDR and
Vin as close as possible to the IC.
Regulator feedback input. Connect to a resistive voltage-divider network to set
the output voltage. This pin can be also used for ON/OFF control. If this pin is
pulled above 1V the P-channel driver is disabled and controller resets internal
soft start circuit.
Ground pin.
This pin is used as a current limit input for the internal current limit comparator.
Connect to the drain pin of the external MOSFET through an optional resistor.
Internal threshold is pre-set to 300mV nominal and can be decreased by
changing the external resistor based on the following formula: VTRSHLD =
300mV – 30uA * R
BLOCK DIAGRAM
VIN
5V
Oscillator
Vin - 5V LDO
VDR
FAULT
FB
FAULT
+
-
1V
VIN
I = k x VIN
5V Internal LDO
VREF
+
-
Error Amplifier
PWM Latch
Reset Dominant
S
+R
-
PWM Comparator
FAULT
GATE
VDR
UVLO
200ms delay
FAULT
Register
S
R
R
Set Dominant
4-Bit counter
POR
ENBL
Overcurrent
Comparator
VIN - 0.3V
LX
30uA
GND
Mar22-07 RevC
SP6125: TSOT-6 PFET Buck Controller
3
2007 Sipex Corporation





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