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PDF AA18375AP Data sheet ( Hoja de datos )
| Número de pieza | AA18375AP | |
| Descripción | Switching Regulator Controller | |
| Fabricantes | Agamem Microelectronic | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AA18375AP (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Agamem Microelectronics Inc.
www.DataSheet4U.com
PRELIMINARY
AA18375AP
Switching Regulator Controller
OVERVIEW
The AA18375AP is a two-channel PWM DC-DC converter control IC that features low-voltage operation.
This IC can obtain the step-up, step-down and inverting voltages with a small number of external
components. Because the IC is compactly packaged, it is best suited for use as a power supply in
portable equipment.
FEATURES
• Wide supply voltage range: 3.6 V to 15 V
• Low current consumption: 1.3 mA typical
• Control in a wide output frequency range is possible (1 kHz to 500 kHz).
• Timer latch, short-circuit protection circuit is built in.
• Circuit to prevent malfunction during low input voltage is built in.
• Built-in reference voltage (1.28V) output pin.
• Dead time period is adjustable over the whole range of duty ratio.
• Synchronization operation is possible.
PIN Configuration
(TOP VIEW)
CT 1
RT 2
+IN1 3
-IN1 4
FB1 5
D.T.C.1 6
OUT1 7
GND 8
16 VREF
15 SCP
14 +IN2
13 -IN2
12 FB2
11 D.T.C.2
10 OUT2
9 VCC
APPLICATIONS
• LCD Displays
• PDAs
• Digital Still Cameras
• Hand-held and portable instruments
©Copyright Agamem Microelectronics Inc. 1 www.agamem.com.tw 2006/6/27
1 page  
Agamem Microelectronics Inc.
www.DataSheet4U.com
PRELIMINARY
AA18375AP
Switching Regulator Controller
Common Mode Rejection
Ratio
Max Output Voltage
Width
Output Sink Current
VO = 1.6 V
Output Source Current VO = 1.6 V
Input Threshold Voltage
PWM
(fOSC=10 kHz)
Comparator
Section Input Sink Current
Duty Cycle = 0 %
Duty Cycle = 100 %
Pin 5, Pin 12 = 1.6 V
Input Source Current
Pin 5, Pin 12 = 1.6 V
Output
Section
Output Leak Current
VO = 15 V
Output Saturation Voltage IO = 50 mA
Stand by Current
Average Supply Current
Output “OFF”
RT = 15 kΩ
TIMING DIAGRAM
CMRR
VOM+
VOM
IOM+
IOM
Vt0
Vt100
IIN+
IIN
Leak
VSAT
ICCS
ICCa
60
2.2
–
24
–
–
1.05
24
–
–
–
–
–
80 – dB
2.4
0.7
50
–1.2
1.9
1.3
50
–1.2
–
–
0.9
–
–0.7
2.1
–
–
–0.7
10
V
V
µA
mA
V
V
µA
mA
µA
1.1 1.4 V
1.3 1.8 mA
1.7 2.4 mA
©Copyright Agamem Microelectronics Inc. 5 www.agamem.com.tw 2006/6/27
5 Page 
Agamem Microelectronics Inc.
www.DataSheet4U.com
PRELIMINARY
AA18375AP
Switching Regulator Controller
HOW TO SET OUTPUT VOLTAGE
The output voltage is set using the connection shown below. The error amplifiers are supplied to the
internal reference voltage circuit as are the other internal circuits. The common-mode input voltage range
is from − 0.2 V to +1.45 V. When the amplifiers are operated non-inverting, tie the inverting terminal to
VREF 1.28 V). When the amplifiers are operated inverting, tie the non-inverting terminal to ground.
R2
Vo+ [=Vref X (1+R2/R1)]
+
-
R1
PIN5 or PIN12
Vref
R2
-
R1 +
Vo- [= -Vref X (R2/R1)]
PIN5 or PIN12
Vref
HOW TO SET TIME CONSTANT FOR TIMER LATCH SHORT PROTECTION CIRCUIT
If the load condition drastically changes due to a load short-circuit and if low-level signals (1.1 V or lower)
are input to the non-inverting inputs of the short-circuit protection comparator from the error amplifiers, the
short circuit protection comparator outputs a “Low” level. The protection enable terminal voltage is
discharged, and then the short-circuit protection comparator charges the externally connected protection
enable capacitor CPE according to the following formula:
VPE = 50 mV + tPE x 10-6/CPE
0.65 = 50 mV + tPE x 10-6/CPE
CPE = tPE/0.6 (µ F)
When the power supply is turned on, the output is considered to be short-circuited state so that the S.C.P.
terminal voltage starts charging. It is necessary to set the external capacitor so as to start up the DC-DC
converter output voltage before setting the latch circuit in the later stage. Especially, pay attention to the
delay of the start-up time when applying the soft-start function.
©Copyright Agamem Microelectronics Inc. 11 www.agamem.com.tw 2006/6/27
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AA18375AP.PDF ] | |
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