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L6933H1.2-L6933H1.2TR
High Performance 2A ULDO Linear Regulator with Soft Start
November 2007 Rev 3 1/12
L6933H1.2High performance 2A ULDO linear regulator with Soft Start
Features 2 V to 14 V input voltage range 200 mΩ rDS(on) max 200 µA quiescent current at any load Excellent load and line regulation Adjustable from 1.2 V to 5 V 1 % voltage regulation accuracy Power Good output MLCC capacitors filter supported Adjustable Soft Start Short circuit protection Thermal shut down HSOP8 package
Applications Motherboards, mobile PC Hand-held instruments PCMCIA Cards Processors I/O Chipset and RAM supply
DescriptionThe L6933H1.2 ultra low drop output linear
regulator operates from 2 V to 14 V and is able to
support output current up to 2 A. Designed with
an internal 50 mΩ N-channel MOSFET , it can be
used for on board DC-DC conversions saving in
real estate, list of components, low noise
generation and power dissipation. L6933H1.2 is
available as adjustable version from 1.2 V to 5 V
with a voltage regulation accuracy of 1 %.
A Soft Start function allows the device to smoothly
increase the Output Voltage at the start-up,
avoiding overshoot. Inhibit function is provided.
The upper current limit is fixed at 2.5 A to control
the current in short circuit condition within ± 8 %.
The current is sensed in the power MOS in order
to limit the power dissipation.
The device is also provided with a thermal shut
down that limits the internal temperature at
150 °C with a histeresys of 20 °C.
Figure 1. Typical operating circuit
Table 1. Device summary
Contents L6933H1.22/12
Contents Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical electrical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.2 Demoboard layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.3 Component part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.1 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.2 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
L6933H1.2 Pin settings
3/12
1 Pin settings
1.1 Pin connection
Figure 2. Pin connection (top view)
1.2 Pin description
Table 2. Pin description
Maximum ratings L6933H1.2
4/12
2 Maximum ratings
2.1 Absolute maximum ratings
2.2 Thermal data
3 Block diagram
Table 3. Absolute maximum ratings
Table 4. Thermal data Package mounted on board
L6933H1.2 Electrical characteristics
5/12
4 Electrical characteristics
Table 5. Electrical characteristics (TJ = 25 °C, VIN = 5 V unless otherwise specified) (1) Specification referred to T from -25 °C to 125 °C.
Typical electrical performance L6933H1.2
6/12 Typical electrical performance
6 Soft-Start
When Vin is above the turn-on threshold, the device implements the Soft-Start phase: a
5 µA current is sourced from the SS pin charging the external capacitor. The voltage across
SS capacitor increases until it reaches about 8 V.
The output voltage is in regulation when the SS voltage exceeds V OUT + 1 V. The SS time
results:
If VIN is below the turn-on threshold, the SS pin is kept shorted to GND.
The SS pin can also be used as ENABLE by shorting the pin to GND through an external
switch: when the voltage at this pin is lower than 0.5 V, the device is disabled.
Figure 4. Output voltage vs
junction temperature
Figure 5. Quiescent current vs
junction temperatureSS
CSS VOUT 1+()•SS
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