L6935TR ,High performance 3 A ULDO linear regulatorApplicationsvoltage from 0.5 V to 3.0 V with a voltage regulation accuracy of 1 %. soft-start is av ..
L6935TR ,High performance 3 A ULDO linear regulatorFeatures■ Up to 5 V input voltage range■ 60 mΩ max RDS(on)■ 35 µA shut-down current■ 3 A maximum ou ..
L6995 ,CONSTANT ON TIME STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATIONABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV V to GND -0.3 to 6 VCC CCV V to GND -0.3 to 6 ..
L6995STR ,STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSIONAbsolute Maximum RatingsSymbol Parameter Value UnitV V to GND -0.3 to 6 VCC CCV V to GND -0.3 to 6 ..
L6996 ,DINAMICALLY PROGRAMMABLE SYNCHRONOUS STEP DOWN CONTROLLER FOR MOBILE CPUsABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV V to GND -0.3 to 6 VCC CCV V to GND -0.3 to 6 ..
L6997 ,STEP DOWN CONTROLLER FOR LOW VOLTAGES OPERATIONSAbsolute Maximum RatingsSymbol Parameter Value UnitV V to GND -0.3 to 6 VCC CCV V to GND -0.3 to 6 ..
LC4128V-5T100C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4128V-5T144C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4128V-5TN128C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4128V-75T100I , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4128V-75T144I , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4128V-75TN100I , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
L6935TR
High performance 3 A ULDO linear regulator
May 2008 Rev 1 1/20
L6935High performance 3 A ULDO linear regulator
Features Up to 5 V input voltage range 60 mΩ max RDS(on) 35 µA shut-down current 3 A maximum output current Split bias and power supplies Adjustable output voltage: 0.5 V to 3.0 V Excellent load and line regulation: 1 %
accuracy (over temperature) MLCC supported Programmable soft-start Short-circuit protection 3.5 A overcurrent protection Thermal shut-down VFQFPN20 4 x 4 x 1.0 mm package
Applications Motherboard Mobile PC Hand-held instruments PCMCIA cards Processors I/O Chipset and RAM supply
DescriptionL6935 is an ultra low drop output linear regulator
operating up to 5 V input and is able to support
output current up to 3 A. Designed with an
internal low-RDS(on) N-channel MOSFET, it can
be used for on-board DC-DC conversions saving
in real estate, list of components and power
dissipation.
Bias input and power input are split to allow linear
conversion from buses lower than 1.2 V
minimizing power losses.
L6935 provides the application with an adjustable
voltage from 0.5 V to 3.0 V with a voltage
regulation accuracy of 1 %. soft-start is available
to program the output voltage rise-time according
to the external capacitor connected.
Enable and Power Good functions make L6935
suitable for complex systems and programmable
start-up sequencing.
The current limit at 3 A protects the system during
a short circuit. The current is sensed in the power
DMOS in order to limit the power dissipation.
Thermal shut down limits the internal temperature
at 150 °C with a hysteresis of 20 °C.
Table 1. Device summary
Contents L69352/20
Contents Typical application circuit and block diagram . . . . . . . . . . . . . . . . . . . . 31.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pins description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . 52.1 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical performances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115.1 Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Power Good . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 VIN vs VBIAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4.1 Over-current protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4.2 Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146.1 Components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1.1 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1.2 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.2 VIN, VBIAS and sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Demonstration board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 VFQFPN20 mechanical data and package dimensions . . . . . . . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Typical application circuit and block diagram L6935
3/20 Typical application circuit and block diagram
1.1 Application circuit
Figure 1. Typical application circuit - VIN = VBIAS
Figure 2. Typical application circuit - VIN ≠ VBIAS
Typical application circuit and block diagram L6935
4/20
1.2 Block diagram
Figure 3. Block diagram
Pins description and connection diagrams L6935
5/20 Pins description and connection diagrams
Figure 4. Pins connection (top view)
2.1 Pin descriptions
Table 2. Pins descriptions
Pins description and connection diagrams L6935
6/20
Table 2. Pins descriptions (continued)
Electrical specifications L6935
7/20
3 Electrical specifications
3.1 Absolute maximum ratings
Table 3. Absolute maximum ratings
3.2 Thermal data
Table 4. Thermal data Measured with the component mounted on demonstration board in free air (22 x 28.5 mm - 2 layer 70 µm
copper).
Electrical specifications L6935
8/20
3.3 Electrical characteristics
Table 5. Electrical characteristics
(VIN = 5 V, VBIAS = 5 V; TA = 25 °C unless otherwise specified). Parameter guaranteed by design, not tested in production
Typical performances L6935
9/20
4 Typical performances
Figure 5. Output voltage and OC threshold vs junction temperature
Figure 6. Quiescent and shutdown current vs junction temperature
Figure 7. Line regulation
Typical performances L6935
10/20
Figure 8. Load regulation
