Down Controller. SP6127 Datasheet

SP6127 Controller. Datasheet pdf. Equivalent


Sipex Corporation SP6127
www.DataSheet4U.com
SP6127
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
900kHz 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
SP6127
6 PinTSOT
1 23
VIN GATE VDR
__________________________________________________________ DESCRIPTION
The SP6127 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 VIN, making it 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 the high-side MOSFET’s ON resistance sensing and allows setting the overcurrent protection
value up to 300mV threshold (measured between VIN-LX). The SP6127 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
C7
0.1uF
1
Vin
Gate
2
Rs=1k
LX
Q1
Si2343DS
L1, IHLP-2525CZ
3.3uH, 30mOhm, 6A
SP6127
3
VDR
6
GND
5
4
VFB
Ds RZ
MBRA340T3G 2K
CZ
33pF
R1
200k, 1%
R2
100k, 1%
SHDN
D1 1N4148
High=Of f
VIN
C1
4.7uF
12V
GND
VOUT
C4
22uF
1.8V
0-2.0A
GND
June 26, 2007
SP6127 TSOT-6 PFET Buck Controller
Page 1
2007 Sipex Corporation


SP6127 Datasheet
Recommendation SP6127 Datasheet
Part SP6127
Description Step Down Controller
Feature SP6127; www.DataSheet4U.com SP6127 High-Voltage, Step-Down Controller in TSOT6 FEATURES Wide 4.5V – 29V In.
Manufacture Sipex Corporation
Datasheet
Download SP6127 Datasheet




Sipex Corporation SP6127
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.
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, 10 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
MIN TYP MAX UNITS
CONDITIONS
UVLO Turn-On Threshold
UVLO Turn-Off Threshold
UVLO Hysteresis
4.2 4.35 4.5
4.0 4.15 4.4
0.2
V
V
V
0°C< Tj <125°C
0°C< Tj <125°C
Operating Input Voltage Range
Operating Input Voltage Range
4.5
7
29 V
0°C< Tj <125°C
29 V
Operating VCC Current
Reference Voltage Accuracy
Reference Voltage Accuracy
0.3 3
0.5 1
0.5 2
mA VFB=1.2V
%
%
Reference Voltage
0.594 0.6 0.606 V
Reference Voltage
0.588 0.6 0.612 V
Switching Frequency
Peak-to-peak ramp Voltage
750 900 1050
VIN/5
kHz
V
Minimum ON-Pulse Duration
40 100 ns
Minimum Duty Cycle
Maximum Duty Cycle
Gate Driver Turn-Off Resistance
Gate Driver Pull-Down
Resistance
Gate Driver Pull-up Resistance
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
VIN - VDR voltage difference
4.5
5.5 V
Measure VIN – VDR, VIN>7V
Overcurrent Threshold
LX pin Input Current
OFF interval during hiccup
Soft start time
SHDN Threshold
SHDN Threshold Hysteresis
270 300 330
25 30 35
70
359
0.8 1.0 1.2
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
June 26, 2007
SP6127 TSOT-6 PFET Buck Controller
Page 2
2007 Sipex Corporation



Sipex Corporation SP6127
_______________________________________________________ PIN DESCRIPTION
PIN #
1
2
3
4
5
6
PIN
NAME
VIN
GATE
VDR
FB
GND
LX
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 0.1µF 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
70ms delay
FAULT
Register
S
R
R
Set Dominant
4-Bit counter
POR
ENBL
Overcurrent
Comparator
VIN - 0.3V
LX
30uA
GND
June 26, 2007
SP6127 TSOT-6 PFET Buck Controller
Page 3
2007 Sipex Corporation





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)