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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
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Agamem Microelectronics Inc.
PRELIMINARY
PIN DESCRIPTIONS
AA18380
Switching Regulator Controller
Pin No.
1
2
3
4
5
6
7
8
Symbol
IN-
SCP
VCC
BR/CTL
OUT
GND
OSC
FB
I/O Description
I Internal error amplifier inverting input pin
— Soft start and short circuit protection setting capacitor connection pin
— IC power supply pin
I Output current setting and control pin
O Output voltage monitoring pin
— Ground pin
Timing capacitor & resistor connection pin for setting the internal PWM
frequency
O Error amplifier output pin
BLOCK DIAGRAM
Vcc
3
OSC
7
IN- 1
FB 8
Reference
0.8V
Voltage Supply
0.1V
1.25V
-
Error
Amp.
+
0.5V
36K
500
Sawtooth wave
Oscillator
0.1V
-
+ PWM
+ COMP.
+
DTC 0.6V
Output drive
Control circuit
0.3V
Soft start SCP
6
GND
2
SCP
4
BR/CTL
5 OUT
30K
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Agamem Microelectronics Inc.
AA18380
PRELIMINARY
Switching Regulator Controller
ABSOLUTE MAXIMUM RATINGS
(Ta = +25°C)
Parameter
Power supply voltage
Output source current
Output sink current
Allowable dissipation
Operating temperature
Storage temperature
Symbol
VCC
IO+
IO –
PD
Top
Tstg
Condition
Ta +25° C
Rating
Min Max
— 16
— –50
— 50
— 430*
–30 +85
–55 +125
Unit
V
mA
mA
mW
°C
°C
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
RECOMMENDED OPERATING RANGE
Parameter
Power supply voltage
Error amplifier input voltage
BR/CTL pin input voltage
Output source current
Output sink current
SCP pin capacitance
Phase compensation capacitance
Output current setting resistance
Timing resistance
Timing capacitance
Oscillation frequency
Operating temperature
Symbol
VCC
VI
VBR
IO+
IO –
CPE
CP
RB
RT
CT
fOSC
TOP
Min
1.8
–0.2
–0.2
–40
150
1.0
100
10
–30
Value
Typ
0.1
0.1
390
3.0
270
500
+25
(Ta = +25°C)
Max
15
1.0
VCC
40
5000
10.0
10000
1000
+85
Unit
V
V
V
mA
mA
µF
µF
k
pF
kHz
°C
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Agamem Microelectronics Inc.
AA18380
PRELIMINARY
Switching Regulator Controller
ELECTRICAL CHARACTERISTICS
(VCC = +2 V, Ta = +25° C)
Parameter
Circuit to prevent
malfunction at low
input voltage
(U.V.L.O.)
Soft start
Short circuit
detection (S.C.P.)
Sawtooth wave
oscillator (OSC)
Error amplifier
Idle period
adjustment
section
Reset voltage
Threshold voltage
Charging current
Voltage at soft start
completion
Charging current
Threshold voltage
Oscillation
frequency
Frequency input
stability
Frequency variation
with temperature
Input threshold
voltage
VT input stability
VT variation with
temperature
Input bias current
Voltage gain
Frequency
bandwidth
Maximum output
voltage range
Output source
current
Output sink current
Maximum duty cycle
Symbol
VR
VTH
ICS
VtS
ICPC
VtPC
fOCS
fdV
fdT
VT
VTdV
VTdT
IB
AV
BW
VOM+
VOM –
IOM+
IOM –
tDUTY
Condition
VSCP = 0 V
VSCP = 0 V
RT = 3.0 k, CT = 270 pF
VCC = 2 V to 15 V
Ta = –30°C to +85°C
VFB = 450 mV
VCC = 2 V to 15 V
Ta = –30°C to +85°C
VIN = 0 V
AV = 0 dB
VFB = 0.45 V
RT = 3.0 k, CT = 270 pF
VFB = 0.8 V
Min
1.1
–1.5
0.7
–1.5
0.7
400
480
–1.0
70
0.78
24
65
Value
Typ
1.3
–1.0
0.8
–1.0
0.8
500
2
5
500
5
1
–0.2
100
6
0.87
0.05
–40
40
75
Max
0.9
1.5
–0.7
0.9
–0.7
0.9
600
10
520
20
1.0
145
0.2
–24
85
Unit
V
V
µA
V
µA
V
kHz
%
%
mV
mV
%
µA
V/V
MHz
V
V
µA
µA
%
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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 , IO = –15 mA
RB = 750 , VCC = 1.8 V
IO = –10 mA
RB = 390 , IO = 15 mA
RB = 750 , VCC = 1.8 V
IO = 10 mA
RB = 390 , VO = 0.9 V
RB = 390 , VO = 0.3 V
RB = 390
BR/CTL pin open or VCC
RB = 390
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 k
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.
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