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L6920D 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L6920D은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 L6920D 기능
기능 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER
제조업체 STMicroelectronics
로고 STMicroelectronics 로고


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L6920D 데이터시트, 핀배열, 회로
L6920
1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER
s 0.6 TO 5.5V OPERATING INPUT VOLTAGE
s 1V START UP INPUT VOLTAGE
s INTERNAL SYNCHRONOUS RECTIFIER
s ZERO SHUT DOWN CURRENT
s 3.3V AND 5V FIXED OR ADJUSTABLE
OUTPUT VOLTAGE (2V UP TO 5.2V)
s 120mINTERNAL ACTIVE SWITCH
s LOW BATTERY VOLTAGE DETECTION
s REVERSE BATTERY PROTECTION
Applications
s ONE TO THREE CELL BATTERY DEVICES
s PDA AND HAND HELD INSTRUMENTS
s CELLULAR PHONES - DIGITAL CORDLESS
PHONE
s PAGERS
s GPS
s DIGITAL CAMERAS
APPLICATION CIRCUIT
TSSOP8
ORDERING NUMBER: L6920D
DESCRIPTION
The L6920 is a high efficiency step-up controller re-
quiring only three external components to realize the
conversion from the battery voltage to the selected
output voltage.
The start up is guaranteed at 1V and the device is op-
erating down to 0.6V.
Internal synchronous rectifier is implemented with a
120mP-channel MOSFET and, in order to improve
the efficiency, a variable frequency control is imple-
mented.
VCC
2.5V
L1 LX
C2
SHDN
LBI
REF
78
1
5
L6920
23
46
OUT
FB
C3
LBO
GND
VOUT
3.3V
500mA
C1
D00IN1136C
May 2003
1/12




L6920D pdf, 반도체, 판매, 대치품
L6920
Figure 1. Efficiency vs. Output Current
100
Vin = 2.4V
90
80
Vin = 1.2V
70
60
50
40
30
20
10
0
0.01
0.1
Vout = 3.3V
L = 47µH
C = 100µF
1 10
LOAD CURRENT [mA]
100
1000
Figure 2. Efficiency vs. Output Current
100
Vin = 3.6V
90
Vin = 2.4V
80
Vin = 1.2V
70
60
50 Vofut = 5V
L = 47µH
40 C = 100µF
30
20
10
0
0.01
0.1 1
10 100
LOAD CURRENT [mA]
1000
Figure 3. Startup Voltage vs Output Current
1.4
1.2
1
0.8
0.6
0.4 L = 47µH
C = 22µF
0.2
0
30 60 90 120 150 180
Output current (mA)
4/12

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L6920D 전자부품, 판매, 대치품
L6920
Figure 6. No regulation. Iload > Iload_lim Trace1:
Vout (100mV~/div) Trace 4: IL (200mA/div).
Time div.: 5 µs/div
The synchronous switch body diode causes a para-
sitic path between power supply and output that can't
be avoided also in shutdown.
Low battery detection
The L6920 includes a low battery detector compara-
tor. Threshold is VREF voltage and a 1.3% hystere-
sis is added to avoid oscillations when input crosses
the threshold slowly. The LBO is an open drain out-
put so a pull up resistor is required for a proper use.
Start-up
One of the key features of L6920 is the startup at sup-
ply voltage down to 1V (please see the diagram in
Figure 3. in case of heavy load).
The device leaves the startup mode of operation as
soon as VOUT goes over 1.4V. During startup, the
synchronous switch is off and the energy is trans-
ferred to the load through its intrinsic body diode.
The N-channel switches with a very low RDSon
thanks to an internal charge pump used to bias the
power mos gate. Because of this modified behavior,
TON/TOFF times are lengthened. Current limit and
zero crossing detection are still available.
Shutdown
In shutdown mode (SHDN pulled low) all internal cir-
cuitries are turned off, minimizing the current provid-
ed by the battery (ISHDN < 100 nA, in typical case).
Both switches are turned off, and the low battery
comparator output is forced in high impedance state.
Reverse polarity
A protection circuit has been implemented to avoid
that L6920 and the battery are destroyed in case of
wrong battery insertion.
In addition, this circuit has been designed so that the
current required by the battery is zero also in reverse
polarity.
APPLICATION INFORMATION
Output voltage selection
Output voltage must be selected acting on FB pin.
Three choices are available: fixed 3.3V, 5V or adjust-
able output set via an external resistor divider.
OUTPUT VOLTAGE SELECTION
VOUT = 3.3V
FB pin connected to OUT (see
application circuit)
VOUT = 5V
FB pin connected to GND
2V VOUT 5.2V
FB pin connected to a resistive
divider
VOUT
=
1.23 V 1
+
RR-----45--
7/12

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