ST L6932 User Manual
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
L6932
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)
APPLICATIONS
■ MOTHERBOARDS
■ MOBILE PC
■ HAND-HELD INSTRUMENTS
■ PCMCIA CARDS
■ PROCESSORS I/O
■ CHIPSET AND RAM SUPPLY
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
V
IN
2V to 14V
IN
2
C1
L6932D
5,6,7,8
GND
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.
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.
1.5V-1.8V-2.5V
C2
V
OUT
OUT
3
PGOOD
4
1
EN
December 2005
V
IN
2V to 14V
C2
V
OUT
1.2V to 5V
IN
2
C1
L6932D
5,6,7,8
GND
OUT
4
R1
ADJ
3
1
EN
R2
Rev. 9
1/11
L6932
PIN CONNECTIONS
EN
ADJ
OUT
1
IN
2
3
4
L6932D1.2
8
7
6
5
GND
GND
GND
GND
EN
IN
OUT
PGOOD
1
2
3
4
L6932D1.5
L6932D1.8
L6932D2.5
8
7
6
5
GND
GND
GND
GND
PIN FUNCTION
N°
L6232D
1.2
1 EN Enables the device if connected to Vin and disables the device if forced to gnd.
2 IN Supply voltage. This pin is connected to the drain of the internal N-mos. Connect this
ADJ – Connecting this pin to a voltage divider it is possible to programme the output voltage
3
L6232D
1.5/1.8/
Description
2.5
pin to a capacitor larger than 10
µF.
between 1.2V and 5V.
– OUT Regulated output voltage. This pin is connected to the source of the internal N-mos.
Connect this pin to a capacitor of 10
µF.
OUT – Regulated output voltage. This pin is connected to the source of the internal N-mos.
Connect this pin to a capacitor of 10
µF.
4
– PGOOD 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.
5, 6, 7, 8 GND Ground pin.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
in
VIN and Pgood 14.5 V
EN, OUT and ADJ -0.3 to (V
+0.3) V
in
THERMAL DATA
Symbol Parameter Value Unit
R
th J-amb
T
max
T
stg
(*) Measured on Demoboard with about 4 cm2 of dissipating area 2 Oz.
Thermal Resistance Junction to Ambient 62 (*) °C/W
Maximum Junction Temperature 150 °C
Storage Temperature Range -65 to 150 °C
2/11
L6932
BLOCK DIAGRAM
GND
ELECTRICAL CHARACTERISTCS
(*) Specification referred to T
(Referred to the Fixed Voltage version)
IN
REFERENCE
VREF=1.25V
ENABLEEN
THERMAL
SENSOR
(Tj = 25°C, VIN = 5V unless otherwise specified)
from -25°C to 125°C.
j
VREF
0.9 VREF
+
ERROR
AMPL.
CHARGE
PUMP
-
+
CURRENT
LIMIT
DRIVER
OUT
PG
D99IN1100
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
R
Operating Supply Voltage 2 14 V
in
V
Output voltage L6932D1.2 Io = 0.1A; Vin = 3.3V 1.188 1.2 1.212 V
o
Output voltage L6932D1.5 I
Output voltage L6932D1.8 I
Output voltage L6932D2.5 I
L6932D1.2
Line Regulation
L6932D1.5
Line Regulation
L6932D1.8
Line Regulation
L6932D2.5
Line Regulation
L6932D1.2 Load Regulation V
L6932D1.5 Load Regulation V
L6932D1.8 Load Regulation V
L6932D2.5 Load Regulation V
Drain Source ON resistance 200 mΩ
dson
= 0.1A; Vin = 3.3V 1.485 1.5 1.515 V
o
= 0.1A; Vin = 3.3V 1.782 1.8 1.818 V
o
= 0.1A; Vin = 3.3V 2.475 2.5 2.525 V
o
V
= 2.5V ±10%; Io = 10mA 5 mV
in
V
= 3.3V ±10%; Io = 10mA 5 mV
in
V
= 5V ±10%; Io = 10mA 5 mV
in
V
= 2.5V ±10%; Io = 10mA 5 mV
in
V
= 3.3V ±10%; Io = 10mA 5 mV
in
V
= 5V ±10%; Io = 10mA 5 mV
in
V
= 2.5V ±10%; Io = 10mA 5 mV
in
V
= 3.3V ±10%; Io = 10mA 5 mV
in
= 5V ±10%; Io = 10mA 5 mV
V
in
V
= 3.3V ±10%; Io = 10mA 5 mV
in
V
= 5V ±10%; Io = 10mA 5 mV
in
= 3.3V; 0.1A < Io < 2A 15 mV
in
= 3.3V; 0.1A < Io < 2A 15 mV
in
= 3.3V; 0.1A < Io < 2A 15 mV
in
= 3.3V; 0.1A < Io < 2A 15 mV
in
3/11
L6932
ELECTRICAL CHARACTERISTCS
(continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
I
I
V
Current limiting 2.3 2.5 2.7 A
occ
I
Quiescent current 0.2 0.4 mA
q
Shutdown current 2V < Vin < 14V
sh
Ripple Rejection f = 120Hz, I
= 5V, ∆Vin = 2Vpp
V
in
EN Input Threshold 0.5 0.65 0.8 V
en
Pgood threshold V
rise 90 %Vo
o
= 1A
o
*
60 75 dB
25 µA
Pgood Hysteresis 10 %Vo
Pgood saturation I
Figure 1. Output Voltage vs. Junction
Temperature (L6932D1.2)
1.213
1.212
1.212
1.211
V
1.211
1.210
1.210
1.209
-60 -40 -20 0 20 40 60 80 100 120 140 160
Temp [°C]
=1mA 0.2 0.4 V
pgood
Figure 3. Output Voltage vs. Junction
Temperature (L6932D2.5)
2.520
2.515
2.510
V
2.505
2.500
2.495
-60 -40 -20 0 2 0 40 60 80 100 1 20 140 1 60
Temp [°C]
Figure 2. Output Voltage vs. Junction
Temperature (L6932D1.8)
1.808
1.804
1.800
V
1.796
1.792
1.788
-60 - 40 -20 0 20 40 60 80 100 120 140 160
4/11
Temp [°C]
Figure 4. Quiescent Current vs. Junction
Temperature
310
300
Vin=5V
290
Iq
280
(uA)
270
260
250
-40 -20 0 20 40 60 80 100 120 140
Temp [°C ]
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