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PDF AA18380 Data sheet ( Hoja de datos )
| Número de pieza | AA18380 | |
| Descripción | Switching Regulator Controller | |
| Fabricantes | Agamem Microelectronic | |
| Logotipo |  |
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Agamem Microelectronics Inc.
PRELIMINARY
AA18380
Switching Regulator Controller
OVERVIEW
The AA18380 is a single-channel PWM DC-DC regulator control IC that supports low-voltage operation. This
IC features a low minimum operating voltage of 1.8 V and low current consumption, is optimal for use in
high-efficiency power supplies for portable electronic equipment.
FEATURES
• Wide operating supply voltage range: 1.8 V to 15 V
• Stable reference voltage circuit: 1.25V.
• Low current consumption: Typically 5.5 mA in operation, 1 µA or less in stand-by
• Wide PWM output frequency range: 10 kHz to 1 MHz
• Incorporates a soft start circuit and adjustable soft start time.
• Timer latch short-circuit protection circuit (SCP).
• Low input voltage malfunction prevention circuit (U.V.L.O.)
• On/off control function
• Totem-pole type output by using an external resistor to set the output current (for NPN transistors)
PIN Configuration
IN- 1
SCP 2
VCC 3
BR/CTL 4
(TOP VIEW)
8 FB
7 OSC
6 GND
5 OUT
APPLICATIONS
• LCD Displays
• PDAs
• Digital Still Cameras
• Hand-held and portable instruments
©Copyright Agamem Microelectronics Inc.
1
www.agamem.com.tw 2007/1/15
1 page  
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Agamem Microelectronics Inc.
AA18380
PRELIMINARY
Switching Regulator Controller
(Continued)
Parameter
Symbol
Condition
Output section
Output voltage
Output current
setting section/
Control section
Entire device
Output source
current
Output sink current
Pull down resistance
Pin voltage
Input off condition
Input on condition
Pin current range
Stand-by current
Average supply
current
TIMING DIAGRAM
VOH1
VOH2
VOL1
VOL2
IO+
IO –
RO
VBR
IOFF
ION
IBR
ICCS
ICC
RB = 390 Ω , IO = –15 mA
RB = 750 Ω , VCC = 1.8 V
IO = –10 mA
RB = 390 Ω , IO = 15 mA
RB = 750 Ω , VCC = 1.8 V
IO = 10 mA
RB = 390 Ω , VO = 0.9 V
RB = 390 Ω , VO = 0.3 V
—
RB = 390 Ω
—
BR/CTL pin open or VCC
RB = 390 Ω
Value
Unit
Min Typ Max
1.0 1.2 — V
0.8 1.0 — V
— 0.1 0.2 V
— 0.1 0.2 V
— –30 –20 mA
30 60 — mA
20 30 40 kΩ
0.2 0.3 0.4 V
–20 —
0 µA
— — –45 µ A
–1.8 — –0.1 mA
——
1 µA
— 5.5 9.3 mA
FB Pin voltage
Reference input for short
circuit detectioin compartor
Idle Period setting voltage
Sawtooth wave output
Soft start setting voltage
Out put waveform
Stable State
SCP pin waveform
Soft start
ON--
tS
Power supply control SW
OFF
Output
Short
circuit
tPE
Output short circuit
Short circuit
detection
©Copyright Agamem Microelectronics Inc.
5
www.agamem.com.tw 2007/1/15
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Agamem Microelectronics Inc.
PRELIMINARY
TYPICAL APPLICATION EXAMPLE
Boost Type - Step Up
AA18380
Switching Regulator Controller
IN- 1
SCP 2
Vcc 3
C3
Vin 33uF BR/CTL
(3V)
4
C1
0.1uF R6
390
Q2
2N7002
8 FB
7 OSC
6 GND
5 OUT
C5
270pF
R5
3K
L1
22uH
1N5821
D1
R1 18K
Q1
FZT489
C4
0.1uF
R2 2K
Vout
(5V)
C6
10uF
Vout = 0.5 X (1 + R1/R2)
Buck Type - Step Down
Vin
(12V)
33uF IN- 1
SCP 2
Vcc 3
BR/CTL 4
0.1uF
4.7K
8 FB
7 OSC
6 GND
5 OUT
270pF
470
68pF
2SA1585S 22uH
2N3904
20K 2K
R1
9K
47uF
2N3904
FR154
R2
1K
104pF
0.1uF
3K
1.bootstrap, single end push pull style.
2.Vout = 0.5 X (1 + R1/R2)
3.For example, R1=5.6K , R2=1K , Vout=3.3V
©Copyright Agamem Microelectronics Inc.
11
www.agamem.com.tw 2007/1/15
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AA18380.PDF ] | |
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