ST L6932 User Manual
L6932
HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR
■2V TO 14V INPUT VOLTAGE RANGE
■200mΩ Rdson MAX.
■200µA QUIESCENT CURRENT AT ANY LOAD
■EXCELLENT LOAD AND LINE REGULATION
■1.5V, 1.8V AND 2.5V FIXED VOLTAGE
■ADJUSTABLE FROM 1.2V TO 5V (L6932D1.2)
■1% VOLTAGE REGULATION ACCURACY
■SHORT CIRCUIT PROTECTION
■THERMAL SHUT DOWN
■SO-8 (4+4) PACKAGE
APPLICATIONS
■MOTHERBOARDS
■MOBILE PC
■HAND-HELD INSTRUMENTS
■PCMCIA CARDS
■PROCESSORS I/O
■CHIPSET AND RAM SUPPLY
SO-8 (4+4)
ORDERING NUMBERS:
L6932D1.2 (SO-8) |
L6932D1.2TR (T&R) |
L6932D1.5 (SO-8) |
L6932D1.5TR (T&R) |
L6932D1.8 (SO-8) |
L6932D1.8TR (T&R) |
L6932D2.5 (SO-8) |
L6932D2.5TR (T&R) |
Mosfet, can be usefull for the DC-DC conversion between 2.5V and 1.5V at 2A in portable applications reducing the power dissipation.
L6932 is available in 1.5V, 1.8V, 2.5V and adj version from 1.2V and ensure a voltage regulation accuracy of 1%.
The 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.
DESCRIPTION
The L6932 Ultra Low Drop Output linear regulator operates from 2V to 14V and is able to support 2A. Designed with an internal 50mΩ N-channel
TYPICAL OPERATING CIRCUIT
The device is also provided of a thermal shut down that limits the internal temperature at 150°C with an histeresys of 20°C. L6932 provides the Enable and the Power good functions.
VIN |
IN |
OUT |
VOUT |
2V to 14V |
2 |
3 |
1.5V-1.8V-2.5V |
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L6932D |
PGOOD |
C2 |
C1 |
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4 |
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5,6,7,8 |
1 |
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GND |
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EN |
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VIN |
IN |
OUT |
VOUT |
2V to 14V |
2 |
4 |
1.2V to 5V |
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L6932D |
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R1 |
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ADJ |
C2 |
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C1 |
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3 |
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5,6,7,8 |
1 |
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GND |
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R2 |
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EN |
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Rev. 9 |
December 2005 |
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1/11 |
L6932
PIN CONNECTIONS
EN |
1 |
8 |
GND |
EN |
1 |
8 |
GND |
IN |
2 |
7 |
GND |
IN |
2 |
7 |
GND |
ADJ |
3 |
6 |
GND |
OUT |
3 |
6 |
GND |
OUT |
4 |
5 |
GND |
PGOOD |
4 |
5 |
GND |
L6932D1.2 |
L6932D1.5 |
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L6932D1.8 |
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L6932D2.5 |
PIN FUNCTION
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L6232D |
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L6232D |
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N° |
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1.5/1.8/ |
Description |
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1.2 |
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2.5 |
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1 |
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EN |
Enables the device if connected to Vin and disables the device if forced to gnd. |
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2 |
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IN |
Supply voltage. This pin is connected to the drain of the internal N-mos. Connect this |
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pin to a capacitor larger than 10 F. |
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ADJ |
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– |
Connecting this pin to a voltage divider it is possible to programme the output voltage |
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between 1.2V and 5V. |
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3 |
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– |
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OUT |
Regulated output voltage. This pin is connected |
to the source of the internal N-mos. |
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Connect this pin to a capacitor of 10 F. |
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OUT |
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– |
Regulated output voltage. This pin is connected |
to the source of the internal N-mos. |
4 |
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Connect this pin to a capacitor of 10 F. |
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– |
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PGOOD |
Power good output. The pin is open drain and detects the output voltage. It is forced |
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low if the output voltage is lower than 90% of the programmed voltage. |
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5, 6, 7, 8 |
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GND |
Ground pin. |
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ABSOLUTE MAXIMUM RATINGS
Symbol |
Parameter |
Value |
Unit |
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Vin |
VIN and Pgood |
14.5 |
V |
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EN, OUT and ADJ |
-0.3 to (Vin +0.3) |
V |
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THERMAL DATA
Symbol |
Parameter |
Value |
Unit |
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Rth J-amb |
Thermal Resistance Junction to Ambient |
62 (*) |
°C/W |
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Tmax |
Maximum Junction Temperature |
150 |
°C |
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Tstg |
Storage Temperature Range |
-65 to 150 |
°C |
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(*) Measured on Demoboard with about 4 cm2 of dissipating area 2 Oz.
2/11
L6932
BLOCK DIAGRAM (Referred to the Fixed Voltage version)
IN |
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CHARGE |
CURRENT |
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PUMP |
LIMIT |
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VREF |
+ |
DRIVER |
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REFERENCE |
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VREF=1.25V |
- |
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ERROR |
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OUT |
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AMPL. |
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EN |
ENABLE |
THERMAL |
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SENSOR |
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PG |
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- |
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0.9 VREF |
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+ |
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GND |
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D99IN1100 |
ELECTRICAL CHARACTERISTCS (Tj = 25°C, VIN = 5V unless otherwise specified)
(*) Specification referred to Tj from -25°C to 125°C.
Symbol |
Parameter |
Test Condition |
Min. |
Typ. |
Max. |
Unit |
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Vin |
Operating Supply Voltage |
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2 |
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14 |
V |
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Vo |
Output voltage L6932D1.2 |
Io = 0.1A; Vin = 3.3V |
1.188 |
1.2 |
1.212 |
V |
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Output voltage L6932D1.5 |
Io = 0.1A; Vin = 3.3V |
1.485 |
1.5 |
1.515 |
V |
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Output voltage L6932D1.8 |
Io = 0.1A; Vin = 3.3V |
1.782 |
1.8 |
1.818 |
V |
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Output voltage L6932D2.5 |
Io = 0.1A; Vin = 3.3V |
2.475 |
2.5 |
2.525 |
V |
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L6932D1.2 |
Vin = 2.5V ±10%; Io = 10mA |
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5 |
mV |
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Line Regulation |
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Vin = 3.3V ±10%; Io = 10mA |
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5 |
mV |
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Vin = 5V ±10%; |
Io = 10mA |
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5 |
mV |
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L6932D1.5 |
Vin = 2.5V ±10%; Io = 10mA |
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5 |
mV |
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Line Regulation |
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Vin = 3.3V ±10%; Io = 10mA |
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5 |
mV |
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Vin = 5V ±10%; |
Io = 10mA |
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5 |
mV |
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L6932D1.8 |
Vin = 2.5V ±10%; Io = 10mA |
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5 |
mV |
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Line Regulation |
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Vin = 3.3V ±10%; Io = 10mA |
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5 |
mV |
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Vin = 5V ±10%; |
Io = 10mA |
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5 |
mV |
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L6932D2.5 |
Vin = 3.3V ±10%; Io = 10mA |
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5 |
mV |
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Line Regulation |
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Vin = 5V ±10%; |
Io = 10mA |
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5 |
mV |
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L6932D1.2 Load Regulation |
Vin = 3.3V; 0.1A < Io < 2A |
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15 |
mV |
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L6932D1.5 Load Regulation |
Vin = 3.3V; 0.1A < Io < 2A |
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15 |
mV |
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L6932D1.8 Load Regulation |
Vin = 3.3V; 0.1A < Io < 2A |
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15 |
mV |
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L6932D2.5 Load Regulation |
Vin = 3.3V; 0.1A < Io < 2A |
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15 |
mV |
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Rdson |
Drain Source ON resistance |
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200 |
mΩ |
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3/11
L6932
ELECTRICAL CHARACTERISTCS (continued)
Symbol |
Parameter |
Test Condition |
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Min. |
Typ. |
Max. |
Unit |
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Iocc |
Current limiting |
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2.3 |
2.5 |
2.7 |
A |
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Iq |
Quiescent current |
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0.2 |
0.4 |
mA |
Ish |
Shutdown current |
2V < Vin < 14V |
* |
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25 |
A |
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Ripple Rejection |
f = 120Hz, Io = 1A |
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60 |
75 |
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dB |
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Vin = 5V, ∆Vin = 2Vpp |
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Ven |
EN Input Threshold |
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0.5 |
0.65 |
0.8 |
V |
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Pgood threshold |
Vo rise |
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90 |
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%Vo |
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Pgood Hysteresis |
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10 |
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%Vo |
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Pgood saturation |
Ipgood =1mA |
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0.2 |
0.4 |
V |
Figure 1. Output Voltage vs. Junction Temperature (L6932D1.2)
1.213 |
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1.212 |
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1.212 |
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1.211 |
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V |
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1.211 |
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1.210 |
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1.210 |
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1.209 |
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-60 |
-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
120 |
140 |
160 |
Temp [°C]
Figure 2. Output Voltage vs. Junction Temperature (L6932D1.8)
1.808 |
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1.804 |
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1.800 |
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V |
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1.796 |
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1.792 |
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1.788 |
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-60 |
-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
120 |
140 |
160 |
Temp [°C]
Figure 3. Output Voltage vs. Junction Temperature (L6932D2.5)
2.520 |
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2.515 |
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2.510 |
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V |
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2.505 |
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2.500 |
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2.495 |
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-60 |
-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
120 |
140 |
160 |
Temp [°C]
Figure 4. Quiescent Current vs. Junction
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Temperature |
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310 |
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300 |
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Vin=5V |
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290 |
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Iq |
280 |
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(uA) |
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270 |
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260 |
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250 |
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-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
120 |
140 |
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Temp [°C ] |
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4/11
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