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L6933H1.2
High performance 2A ULDO linear regulator with Soft Start
Features

2 V to 14 V input voltage range 200 m rDS(on) max 200 A quiescent current at any load Excellent load and line regulation Adjustable from 1.2 V to 5 V 1 % voltage regulation accuracy Power Good output MLCC capacitors filter supported Adjustable Soft Start Short circuit protection Thermal shut down HSOP8 package
HSOP8
Description
The L6933H1.2 ultra low drop output linear regulator operates from 2 V to 14 V and is able to support output current up to 2 A. Designed with an internal 50 m N-channel MOSFET, it can be used for on board DC-DC conversions saving in real estate, list of components, low noise generation and power dissipation. L6933H1.2 is available as adjustable version from 1.2 V to 5 V with a voltage regulation accuracy of 1 %. A Soft Start function allows the device to smoothly increase the Output Voltage at the start-up, avoiding overshoot. Inhibit function is provided. The upper current limit is fixed at 2.5 A 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.
Applications

Motherboards, mobile PC Hand-held instruments PCMCIA Cards Processors I/O Chipset and RAM supply Typical operating circuit
Figure 1.
Table 1. Device summary
Order codes L6933H1.2 L6933H1.2TR November 2007 Package HSOP8 HSOP8 Rev 3 Packaging Tube Tape and reel 1/12
www.st.com 12
Contents
L6933H1.2
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 7
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical electrical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1 7.2 7.3 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Demoboard layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Component part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
8
Components selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1 8.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
9 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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L6933H1.2
Pin settings
1
1.1
Pin settings
Pin connection
Figure 2. Pin connection (top view)
1.2
Pin description
Table 2. Pin description
Pin N Name Description The soft-start time is programmed connecting an external capacitor from this pin and GND. The internal current generator forces a current of 5 A through the capacitor. In steady state regulation, the voltage at this pin will be about 8 V. This pin is also used to inhibit the device: when the voltage at this pin is lower than the 0.5 V, the device is disabled. Supply voltage. This pin is connected to the drain of the internal N-mos. Connect this pin to a capacitor larger than 10 F. Connecting this pin to a voltage divider it is possible to program the output voltage between 1.2 V and 5 V. Regulated output voltage. This pin is connected to the source of the internal Nmos. Connect this pin to a capacitor of 10 F. 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 % the programmed voltage. Not connected Ground pins internally connected
SS/INH
1
VIN ADJ VOUT PGOOD NC GND
2 3 4 5 7, 8 6
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Maximum ratings
L6933H1.2
2
2.1
Maximum ratings
Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol VIN VIN and PGood SS/INH, 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. Block diagram
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L6933H1.2
Electrical characteristics
4
Electrical characteristics
Table 5. Electrical characteristics (TJ = 25 C, VIN = 5 V unless otherwise specified) (1)
Symbol VIN VO Parameter Operating supply voltage Output voltage IO = 0.1 A; VIN = 3.3 V VIN = 2.5 V 10 %; IO = 10 mA Line regulation VIN = 3.3 V 10 %; IO = 10 mA VIN = 5 V 10 %; IO = 10 mA Load regulation rDS(on) IOCC Iq Drain source ON resistance Current limiting Quiescent current Ripple rejection
VINH
Test condition
Min 2 1.188
Typ
Max 14
Unit V V mV mV mV mV m A mA dB V uA %VO %VO
1.2
1.212 5 5 5 15 200
VIN = 3.3 V; 0.1 A < IO < 2 A
2.3
2.5 0.2
2.7 0.4
f = 120 Hz, IO = 1 A VIN = 5 V, VIN = 2 Vpp
60
75 0.5
INHIBIT input threshold Soft start current PGOOD threshold Vss = 0 V VO rise
Iss
-5 90 10
PGOOD
PGOOD hysteresis PGOOD saturation IPGOOD = 1 mA
0.2
0.4
V
1. Specification referred to T from -25 C to 125 C.
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Typical electrical performance
L6933H1.2
5
Typical electrical performance
Figure 4. Output voltage vs junction temperature Figure 5. Quiescent current vs junction temperature
6
Soft-Start
When Vin is above the turn-on threshold, the device implements the Soft-Start phase: a 5 A current is sourced from the SS pin charging the external capacitor. The voltage across SS capacitor increases until it reaches about 8 V. The output voltage is in regulation when the SS voltage exceeds VOUT + 1 V. The SS time results:
C SS * ( V OUT + 1 ) T SS = --------------------------------------------I SS
If VIN is below the turn-on threshold, the SS pin is kept shorted to GND. The SS pin can also be used as ENABLE by shorting the pin to GND through an external switch: when the voltage at this pin is lower than 0.5 V, the device is disabled.
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L6933H1.2
Application information
7
7.1
Application information
Application circuit
Figure 6. Demoboard application circuit
1.2 V OUT = ------- x ( R 1 + R 2 ) R2
7.2
Demoboard layout
Figure 7. Demoboard layout
Note:
SS/INH drives directly the NPN base; its current need to be properly limited.
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Application information
L6933H1.2
7.3
Component part list
Table 6. Component part list Figure 8
Reference C1 C2 C3 CSS R1 R2 R3 Q1 R4 Part number GRM32ER61C226ME20 GRM32ER61A106KA01 Description 22 f, 16 V 10 f, 10 V N.M. 10 nF, 16 V 0 N.M. 100 K General purpose signal NPN 1 K Manufacturer Murata Murata
Figure 8.
Compensation network
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L6933H1.2
Components selection
8
8.1
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 47 F is enough for any application but a much lower value can be sufficient in many cases.
8.2
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 used for particular applications without affecting the loop stability. 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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Package mechanical data
L6933H1.2
9
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. Table 8. SO-8 mechanical data
mm. Dim. Min A A1 A2 B C
(1) D
inch Max 1.75 0.25 1.65 0.51 0.25 5.00 4.00 Min 0.053 0.004 0.043 0.013 0.007 0.189 0.15 0.050 6.20 0.50 1.27 0.10 0.228 0.010 0.016 0.244 0.020 0.050 0.004 Typ Max 0.069 0.010 0.065 0.020 0.010 0.197 0.157
Typ
1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 5.80 0.25 0.40
E e H h L k ddd
0 (min.), 8 (max.)
1. Dimensions D does not include mold flash, protru-sions or gate burrs. Mold flash, potrusions or gate burrs shall not exceed 0.15mm (.006inch) in total (both side).
Figure 9.
Package dimensions
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L6933H1.2
Revision history
10
Revision history
Table 9. Document revision history
Date 21-Mar-2006 16-Jul-2007 22-Nov-2007 Revision 1 2 3 First release Section 8: Components selection on page 9 updated Updated cover page. Changes
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L6933H1.2
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