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L6932H1.2
High performance 2A ULDO linear regulator
Features

2V to 14V input voltage range 200m rDS(on) max 200A 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
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 50m 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 150C with a histeresys of 20C. L6932H1.2 provides the Enable and the Power good functions.
Vout=1.2V to 5V
Vin
2 4
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
Vout
EN
1
L6932H1.2
6 7 8
PGOOD
5
R3 R1
C1
3
FB
C2
GND
NC1
NC2
R2
Table 1. Device summary
Part number L6932H1.2 L6932H1.2TR May 2007 Package HSO-8 HSO-8 Rev 2 Packaging Tube Tape and reel 1/13
www.st.com 13
Contents
L6932H1.2
Contents
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 1.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 2.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 4 5 6
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical electrical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application informations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.1 6.2 6.3 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Demoboard layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Component part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7
Components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.1 7.2 7.3 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Loop Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8 9
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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L6932H1.2
Pin settings
1
1.1
Pin settings
Pin connection
Figure 2. Pin connection (top view)
EN
1
8
NC2
Vin
2
7
NC1
FB
3
6
GND
Vout
4
5
PGOOD
1.2
Pin description
Table 2. Pin description
Name 1 2 3 4 5 6 7, 8 Pin N EN VIN FB VOUT PGOOD GND NC1NC2 Description Enables the device when connected to Vin and disables it when forced to GND. Supply voltage. This pin is connected to the drain of the internal N-mos. Connect this pin to a capacitor larger than 10F. 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 10F. 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. Ground pin Internally not connected.
3/13
Maximum ratings
L6932H1.2
2
2.1
Maximum ratings
Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol VIN VIN and PGOOD EN, OUT and ADJ Parameter Value 14.5 -0.3 to (Vin +0.3) Unit V V
2.2
Thermal data
Table 4. Thermal data
Symbol RthJA TMAX TSTG Parameter Maximum thermal resistance junction-ambient Maximum junction temperature Storage temperature range Value 34
(1)
Unit C/W C C
150 -65 to 150
1. Package mounted on board
3
Block diagram
Figure 3. Internal block diagram
4/13
L6932H1.2
Electrical characteristics
4
Electrical characteristics
Table 5. Electrical characteristcs (TJ = 25C, VIN = 5V unless otherwise specified)
Symbol VIN VO Parameter Operating Supply Voltage Output voltage IO = 0.1A; VIN = 3.3V VIN = 2.5V 10%; IO = 10mA Line Regulation VIN = 3.3V 10%; IO = 10mA VIN = 5V 10%; IO = 10mA Load Regulation rDS(on) IOCC Iq Ish Drain Source ON resistance Current limiting Quiescent current Shutdown current Ripple Rejection Ven EN Input Threshold Pgood threshold Pgood Hysteresis Pgood saturation Ipgood = 1mA Vo rise 2V < VIN < 14V (1) f = 120Hz, IO = 1A VIN = 5V, VIN = 2Vpp 60 0.5 75 0.65 90 10 0.2 0.4 0.8 2.3 2.5 0.2 VIN = 3.3V; 0.1A < IO < 2A Test condition Min 2 1.188 1.2 Typ Max 14 1.212 5 5 5 15 200 2.7 0.4 25 Unit V V mV mV mV mV m A mA A dB V %Vo %Vo V
1. Specification referred to T from -25C to 125C.
5/13
Typical electrical performance
L6932H1.2
5
Typical electrical performance
Figure 4. Output voltage vs junction temperature Figure 5. Quiescent current vs junction temperature
Figure 6.
Shutdown current vs junction temperature
6/13
L6932H1.2
Application information
6
6.1
Application information
Application circuit
Figure 7.
Vin=2V to 14V
Demoboard application circuit
Vout=1.2V to 5V
Vin
2 4
Vout
EN
1
L6932H1.2
6 7 8
PGOOD
5
R3 R1
C1
3
FB
C2
GND
NC1
NC2
R2
1.2 V OUT = ------- x ( R 1 + R 2 ) R2
6.2
Demoboard layout
Figure 8. Demoboard layout
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Components selection
L6932H1.2
6.3
Component part list
Table 6. Component par list
Reference C1 C2 R1 R2 R3 Part number GRM32ER6C226KE20B GRM32ER6C226KE20B Description 22Uf, 16V 22Uf, 16V N.M. 0 100K Manufacturer MURATA MURATA
7
7.1
Components selection
Input capacitor
The input capacitor value depends on a lot of factors such as load transient requirements, input source (battery or DC/DC converter) and its distance from the input cap. Usually a 47F is enough for any application but a much lower value can be sufficient in many cases.
7.2
Output capacitor
The output capacitor choice depends basically on the load transient requirements. Tantalum, Special Polymer, POSCAP and aluminum capacitors are good and offer very low ESR values. Multilayer ceramic caps have the lowest ESR and can be required for particular applications. Nevertheless in several applications they are ok, the loop stability issue has to be considered (see loop stability section). Below a list of some suggested capacitor manufacturers Table 7. Suggested capacitor
Manufacturer MURATA PANASONIC TAYO YUDEN TDK TOKIN SANYO PANASONIC KEMET Type CERAMIC CERAMIC CERAMIC CERAMIC CERAMIC POSCAP SP TANTALUM Cap Value (F) 1 to 47 1 to 47 1 to 47 1 to 47 1 to 47 1 to 47 1 to 47 1 to 47 Rated Voltage (V) 4 to 16 4 to 16 4 to 16 4 to 16 4 to 16 4 to 16 4 to 16 4 to 16
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L6932H1.2
Components selection
7.3
Loop Stability
The stability of the loop is affected by the zero introduced by the output capacitor. The time constant of the zero is given by:
T = ESR x C OUT
1 F ZERP = ---------------------------------------------2 x ESR x C OUT
This zero helps to increase the phase margin of the loop until the time constant is higher than some hundreds of nsec, depending also on the output voltage and current. So, using very low ESR ceramic capacitors could produce oscillations at the output, in particular when regulating high output voltages (adjustable version). To solve this issue is sufficient to add a small capacitor (e.g. 1nF to 10nF) in parallel to the high side resistor of the external divider, as shown in Figure 9. Figure 9.
Vin=2V to 14V
Compensation network
Vin
2 4
Vout
Vout=1.2V to 5V
EN
1
L6932H1.2
6 7 8
PGOOD
5
R3 R1
C3
C1
3
FB
C2
GND
NC1
NC2
R2
The thermal resistance junction to ambient of the demoboard is approximately 34C/W. This mean that, considering an ambient temperature of 60C and, a maximum junction temperature of 150C, the maximum power that the device can handle is 2.7W. This means that the device is able to deliver a DC output current of 2A only with a very low dropout.
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Package mechanical data
L6932H1.2
8
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
10/13
L6932H1.2 Table 8. HSO-8 Mechanical data
mm. Dim. Min A A1 A2 B C D D1 E E1 e H h L k ddd 0.1 5.80 0.25 0.40 3.80 2.4 1.27 6.20 0.50 1.27 0.228 0.010 0.016 8 (max.) 1.35 0.10 1.10 0.33 0.19 4.80 3.1 4.00 0.150 Typ Max 1.75 0.25 1.65 0.51 0.25 5.00 Min 0.053 0.04 0.043 0.013 0.007 0.189
Package mechanical data
inch Typ Max 0.069 0.010 0.065 0.020 0.010 0.197 0.122 0.157 0.094 0.050 0.244 0.020 0.050
0.04
Figure 10. Package dimensions
11/13
Revision history
L6932H1.2
9
Revision history
Table 9. Revision history
Date 23-Jun-2006 07-May-2007 Revision 1 2 First release Final release, mechanical data pad size updated Changes
12/13
L6932H1.2
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