High performance 2A ULDO linear regulator
Features
■ 2V to 14V input voltage range
■ 200mΩ r
■ 200µA quiescent current at any load
■ Excellent load and line regulation
■ Adjustable from 1.2V to 5V
■ 1% voltage regulation accuracy
■ Short circuit protection
■ Thermal shut down
■ HSOP8 package
Applications
■ Motherboards
■ Mobile PC
■ Hand-held instruments
■ PCMCIA Cards
■ Processors I/O
■ Chipset and RAM supply
Figure 1. Typical operating circuit
Vin=2V to 14V
Vin=2V to 14V
DS(on)
max
C1
C1
Vin Vout
Vin Vout
2
2
EN
EN
1
1
GND
GND
L6932H1.2
L6932H1.2
7
7
6
6
L6932H1.2
HSO-8
Description
The L6932 Ultra Low Drop Output linear regulator
operates from 2V to 14V and is able to support
output current up to 2A. Designed with an internal
50mΩ N-channel Mosfet, it can be used for
onboard DC-DC conversions saving in real
estate, list of components, low noise generation
and power dissipation.
L6932H1.2 is available as adjustable version from
1.2V to 5V with a voltage regulation accuracy of
1%.
The upper current limit is fixed at 2.5A 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. L6932H1.2 provides the
Enable and the Power good functions
4
4
R3
R3
PGOOD
PGOOD
5
5
FB
FB
3
3
8
8
NC2NC1
NC2NC1
R1
R1
R2
R2
Vout=1.2V to 5 V
Vout=1.2V to 5 V
.
C2
C2
Table 1. Device summary
Part number Package Packaging
L6932H1.2 HSO-8 Tube
L6932H1.2TR HSO-8 Tape and reel
May 2007 Rev 2 1/13
www.st.com
13
Contents L6932H1.2
Contents
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5 Typical electrical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Application informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.2 Demoboard layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.3 Component part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.1 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.2 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.3 Loop Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2/13
L6932H1.2 Pin settings
1 Pin settings
1.1 Pin connection
Figure 2. Pin connection (top view)
NC2
EN
EN
1
1
8
8
NC2
1.2 Pin description
Table 2. Pin description
Name Pin N° Description
1 EN Enables the device when connected to Vin and disables it when forced to GND.
2 VIN
3FB
4VOUT
5 PGOOD
Supply voltage. This pin is connected to the drain of the internal N-mos.
Connect this pin to a capacitor larger than 10µF.
Connecting this pin to a voltage divider it is possible to program the output
voltage between 1.2V and 5V.
Regulated output voltage. This pin is connected to the source of the internal Nmos. Connect this pin to a capacitor of 10µF.
Power good output. The pin is open drain and detects the output voltage. It is
forced low if the output voltage is lower than 90% of the programmed voltage.
Vin
Vin
FB
FB
Vout
Vout
NC1
2
2
3
3
4
4
7
7
6
6
5
5
NC1
GND
GND
PGOOD
PGOOD
6 GND Ground pin
7, 8
NC1-
NC2
Internally not connected.
3/13
Maximum ratings L6932H1.2
2 Maximum ratings
2.1 Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
IN
2.2 Thermal data
Table 4. Thermal data
Symbol Parameter Value Unit
R
thJA
T
MAX
T
STG
1. Package mounted on board
VIN and PGOOD 14.5 V
EN, OUT and ADJ -0.3 to (Vin +0.3) V
Maximum thermal resistance junction-ambient
Maximum junction temperature 150 °C
Storage temperature range -65 to 150 °C
34
(1)
°C/W
3 Block diagram
Figure 3. Internal block diagram
4/13