L6926
High efficiency monolithic synchronous step-down regulator
Datasheet - production data
Applications
TSSOP8
VFQFPN8
(3x3x1.0 mm)
Features
2 V to 5.5 V battery input range
High efficiency: up to 95%
Internal synchronous switch
No external Schottky diode required
Extremely low quiescent current
1 µA max. shutdown supply current
800 mA max. output current
Adjustable output voltage from 0.6 V
Low-dropout operation: up to 100% duty
cycle
Selectable low noise/low consumption mode
at light load
Power Good signal
± 1% output voltage accuracy
Current mode control
600 kHz switching frequency
Externally synchronized from 500 kHz to 1.4
MHz
OVP
Short-circuit protection
Battery-powered equipment
Portable instruments
Cellular phones
PDAs and handheld terminals
DSC
GPS
Description
The device is a DC-DC monolithic regulator
specifically designed to provide high efficiency.
The L6926 supply voltage can be as low as 2 V
to be used in single Li-Ion cell supplied
applications. Output voltage can be selected by
an external divider down to 0.6 V. Duty cycle can
saturate 100% allowing low-dropout operation.
The device is based on a 600 kHz fixed
frequency, current mode architecture. Low
consumption mode operation can be selected at
light load conditions, allowing switching losses to
be reduced. The L6926 is externally
synchronized by a clock, which makes it useful in
noise sensitive applications. Other features like
Power Good, overvoltage protection, short-circuit
protection and thermal shutdown (150 °C) are
also present.
Table 1: Device summary
Order code
L6926
L6926013TR
L6926Q1
L6926Q1TR
Package
TSSOP8
TSSOP8
VFQFPN8
VFQFPN8
Packing
Tube
Tape and reel
Tube
Tape and reel
April 2015
DocID9302 Rev 11
1/21
www.st.com
This is information on a product in full production.
Contents
L6926
Contents
1
2
3
4
5
Application circuit ........................................................................... 5
Pin configuration ............................................................................. 6
Maximum ratings ............................................................................. 7
Electrical characteristics ................................................................ 8
Detailed description ...................................................................... 10
5.1
Modes of operation ......................................................................... 10
5.1.1
5.1.2
5.1.3
Low consumption mode.................................................................... 10
Low noise mode ............................................................................... 11
Synchronization ................................................................................ 11
5.2
5.3
5.4
Short-circuit protection .................................................................... 11
Slope compensation ........................................................................ 12
Loop stability ................................................................................... 12
Dropout operation ........................................................................... 13
PGOOD ........................................................................................... 13
Adjustable output voltage ................................................................ 13
OVP (overvoltage protection) .......................................................... 13
Thermal shutdown ........................................................................... 13
TSSOP8 package information ......................................................... 15
VFQFPN8 package information ...................................................... 17
6
Additional features and description ............................................. 13
6.1
6.2
6.3
6.4
6.5
7
Package information ..................................................................... 14
7.1
7.2
8
Revision history ............................................................................ 20
2/21
DocID9302 Rev 11
L6926
List of tables
List of tables
Table 1: Device summary ........................................................................................................................... 1
Table 2: Pin description .............................................................................................................................. 6
Table 3: Absolute maximum ratings ........................................................................................................... 7
Table 4: Thermal data ................................................................................................................................. 7
Table 5: Electrical characteristics ............................................................................................................... 8
Table 6: TSSOP8 package mechanical data ............................................................................................ 16
Table 7: VFQFPN8 package mechanical data ......................................................................................... 18
Table 8: Document revision history .......................................................................................................... 20
DocID9302 Rev 11
3/21
List of figures
L6926
List of figures
Figure 1: L6926 application circuit .............................................................................................................. 5
Figure 2: Pin connections (top view) ........................................................................................................... 6
Figure 3: Device block diagram ................................................................................................................ 10
Figure 4: TSSOP8 package outline .......................................................................................................... 15
Figure 5: VFQFPN8 package outline ........................................................................................................ 17
Figure 6: VFQFPN8 recommended footprint ............................................................................................ 19
4/21
DocID9302 Rev 11
L6926
Application circuit
1
Application circuit
Figure 1: L6926 application circuit
L6.8 µH
5 LX
R 3
R2
500 k
8
PGOOD
200 k
3
R1
VFB
100 k
4
C
220 pF
GND
GIPG100420150929LM
V
OUT
= 1.8 V
C2
10 µF
6. 3 V
V
IN
= 2 to 5.5 V
C1
10 µF
6. V
3
V
CC
6
RUN
1
SYNC
7
2
COMP
R1
10 k
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