L6933H12 [STMICROELECTRONICS]
High performance 2A ULDO linear regulator with Soft Start; 高性能软启动2A ULDO线性稳压器
| 型号： | L6933H12 |
| 厂家： | 
ST |
| 描述： | High performance 2A ULDO linear regulator with Soft Start |
| 文件： | 总12页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L6933H1.2
High performance 2A ULDO linear regulator with Soft Start
Features
■ 2 V to 14 V input voltage range
■ 200 mΩ r max
DS(on)
HSOP8
■ 200 µA 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
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 mΩ N-channel MOSFET, it can be
used for on board DC-DC conversions saving in
real estate, list of components, low noise
■ MLCC capacitors filter supported
■ Adjustable Soft Start
■ Short circuit protection
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.
■ Thermal shut down
■ HSOP8 package
Applications
■ Motherboards, mobile PC
■ Hand-held instruments
■ PCMCIA Cards
■ Processors I/O
The device is also provided with a thermal shut
down that limits the internal temperature at
150 °C with a histeresys of 20 °C.
■ Chipset and RAM supply
Figure 1. Typical operating circuit
Table 1. Device summary
Order codes
Package
Packaging
L6933H1.2
HSOP8
HSOP8
Tube
L6933H1.2TR
Tape and reel
November 2007
Rev 3
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
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
10
2/12
L6933H1.2
Pin settings
1
Pin settings
1.1
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 µA 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.
SS/INH
1
Supply voltage. This pin is connected to the drain of the internal N-mos.
Connect this pin to a capacitor larger than 10 µF.
VIN
ADJ
2
3
4
5
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 N-
mos. Connect this pin to a capacitor of 10 µF.
VOUT
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 % the programmed voltage.
NC
7, 8
6
Not connected
GND
Ground pins internally connected
3/12
Maximum ratings
L6933H1.2
2
Maximum ratings
2.1
Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol
Parameter
Value
Unit
VIN
VIN and PGood
14.5
V
SS/INH, OUT and ADJ
-0.3 to (Vin +0.3)
V
2.2
Thermal data
Table 4. Thermal data
Symbol
Parameter
Maximum thermal resistance junction-ambient
Maximum junction temperature
Value
Unit
°C/W
°C
34 (1)
150
RthJA
TMAX
TSTG
Storage temperature range
-65 to 150
°C
1. Package mounted on board
3
Block diagram
Figure 3. Block diagram
4/12
L6933H1.2
Electrical characteristics
4
Electrical characteristics
(1)
Table 5. Electrical characteristics (T = 25 °C, V = 5 V unless otherwise specified)
J
IN
Symbol
Parameter
Test condition
Min Typ Max Unit
Operating supply
voltage
VIN
2
14
V
VO
IO = 0.1 A; VIN = 3.3 V
Output voltage
Line regulation
Load regulation
1.188 1.2 1.212
V
VIN = 2.5 V 10 %; IO = 10 mA
VIN = 3.3 V 10 %; IO = 10 mA
VIN = 5 V 10 %; IO = 10 mA
VIN = 3.3 V; 0.1 A < IO < 2 A
5
5
mV
mV
mV
mV
5
15
Drain source ON
resistance
rDS(on)
200
mΩ
IOCC
Iq
Current limiting
2.3
60
2.5
0.2
2.7
0.4
A
Quiescent current
mA
f = 120 Hz, IO = 1 A VIN = 5 V,
∆VIN = 2 Vpp
Ripple rejection
75
dB
VINH
INHIBIT input threshold
Soft start current
0.5
-5
V
Iss
Vss = 0 V
VO rise
uA
PGOOD threshold
90
%VO
PGOOD PGOOD hysteresis
PGOOD saturation
10
%VO
V
IPGOOD = 1 mA
0.2
0.4
1. Specification referred to T from -25 °C to 125 °C.
5/12
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 µA 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 V
results:
+ 1 V. The SS time
OUT
CSS • (VOUT + 1)
TSS = ---------------------------------------------
ISS
If V is below the turn-on threshold, the SS pin is kept shorted to GND.
IN
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.
6/12
L6933H1.2
Application information
7
Application information
7.1
Application circuit
Figure 6. Demoboard application circuit
1.2
-------
VOUT
=
× (R1 + R2)
R2
7.2
Demoboard layout
Figure 7. Demoboard layout
Note:
SS/INH drives directly the NPN base; its current need to be properly limited.
7/12
Application information
L6933H1.2
7.3
Component part list
Table 6. Component part list Figure 8
Reference
Part number
Description
22 µf, 16 V
10 µf, 10 V
N.M.
Manufacturer
C1
C2
GRM32ER61C226ME20
GRM32ER61A106KA01
Murata
Murata
C3
CSS
10 nF, 16 V
R1
R2
R3
Q1
0 Ω
N.M.
100 KΩ
General purpose signal
NPN
R4
1 KΩ
Figure 8. Compensation network
8/12
L6933H1.2
Components selection
8
Components selection
8.1
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 µF 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
Type
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Poscap
SP
Cap value (µF)
1 to 47
Rated voltage (V)
4 to 16
Panasonic
Tayo Yuden
TDK
1 to 47
4 to 16
1 to 47
4 to 16
1 to 47
4 to 16
Tokin
1 to 47
4 to 16
SANYO
1 to 47
4 to 16
Panasonic
Kemet
1 to 47
4 to 16
Tantalum
1 to 47
4 to 16
9/12
Package mechanical data
L6933H1.2
9
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
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.
inch
Typ
Dim.
Min
Typ
Max
Min
Max
A
1.35
1.75
0.053
0.069
A1
A2
B
0.10
1.10
0.33
0.19
4.80
0.25
1.65
0.51
0.25
5.00
0.004
0.043
0.013
0.007
0.189
0.010
0.065
0.020
0.010
0.197
C
(1)
D
E
e
3.80
4.00
0.15
0.157
1.27
0.050
H
5.80
0.25
0.40
6.20
0.50
1.27
0.228
0.010
0.016
0.244
0.020
0.050
h
L
k
0° (min.), 8° (max.)
0.10
ddd
0.004
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
10/12
L6933H1.2
Revision history
10
Revision history
Table 9. Document revision history
Date
Revision
Changes
21-Mar-2006
16-Jul-2007
22-Nov-2007
1
2
3
First release
Section 8: Components selection on page 9 updated
Updated cover page.
11/12
L6933H1.2
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