enhanced efficiency over conventional LDO regulators
and requires only three low cost ceramic capacitors. No
inductor is required; saving space and cost when com-
pared to inductive switching regulators.
The AAT3183 typically consumes 35µA of no load (zero
output current) quiescent current, making it ideal for
portable battery powered systems. Shutdown current is
less than 1µA.
The AAT3183 soft-start prevents excessive inrush cur-
rent while providing monotonic turn-on characteristics.
The device includes integrated short-circuit and over-
temperature (thermal) protection to safeguard system
components.
The AAT3183 is available in a Pb-free 2.0x2.1mm
SC70JW-8 package. Operating temperature range is
-40°C to +85°C.
•
•
•
•
•
•
•
•
•
Applications
•
•
•
•
•
Camcorders
Digital Still Cameras
DSP Core Supplies
PDAs, Handheld Devices, Notebook PCs
Smart Phones
Typical Application
C
FLY
1µF
C1-
V
IN
C
IN
1µF
IN
C1+
OUT
V
OUT
AAT3183
C
OUT
4.7µF
V
ENABLE
EN
GND
3183.2008.02.1.3
www.analogictech.com
1
PRODUCT DATASHEET
AAT3183
ChargePump
TM
300mA Inductorless Step-Down Converter
Pin Descriptions
Pin #
1
2
3
4
5
6, 7, 8
Symbol
OUT
C1+
C1-
IN
EN
GND
Function
Charge pump converter output. Requires a ceramic capacitor to ground.
Flying capacitor positive terminal. Connect
fl
ying capacitor between C1+ and C1-.
Flying capacitor negative terminal. Connect
fl
ying capacitor between C1+ and C1-.
Charge pump converter input. Requires a ceramic capacitor to ground.
Enable pin. Active high.
Ground.
Pin Configuration
SC70JW-8
(Top View)
OUT
C1+
C1-
IN
1
8
GND
GND
GND
EN
2
3
4
7
6
5
2
www.analogictech.com
3183.2008.02.1.3
PRODUCT DATASHEET
AAT3183
ChargePump
TM
300mA Inductorless Step-Down Converter
Absolute Maximum Ratings
1
Symbol
V
IN
V
EN
T
J
T
S
T
LEAD
Description
Input Voltage to Ground
Enable Voltage to Ground
Operating Junction Temperature Range
2
Storage Temperature Range
Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6.0
-0.3 to 6.0
-40 to 150
-65 to 150
300
Units
V
V
°C
°C
°C
Thermal Information
Symbol
θ
JA
P
D
Description
Thermal Resistance
Maximum Power Dissipation at T
A
= 25°C
3
Value
160
625
Units
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. T
J
is calculated from the ambient temperature T
A
and power dissipation P
D
according to the following formula: T
J
= T
A
+ P
D
·
θ
JA
.
3. Mounted on an FR4 board.
3183.2008.02.1.3
www.analogictech.com
3
PRODUCT DATASHEET
AAT3183
ChargePump
TM
300mA Inductorless Step-Down Converter
Electrical Characteristics
1
V
IN
= 3.6V, C
IN
= C
FLY
= 1.0µF, C
OUT
= 4.7µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
=
25°C.
Symbol
V
IN
V
OUT
V
UVLO
I
OUT
I
Q
Description
Input Voltage
Output Voltage Accuracy
Under-Voltage Lockout (UVLO)
Output Current
Quiescent Current
Shutdown Current
Output Voltage Ripple
Line Regulation
Load Regulation
Soft-Start Time
Clock Frequency
Enable Threshold Low
Enable Threshold High
EN Input Leakage
Output Impedance
Over-Temperature Shutdown Threshold
Over-Temperature Shutdown Hysteresis
Conditions
No Load, T
A
= 25°C
No Load
V
IN
Rising
Hysteresis
V
IN
Falling
V
EN
= V
IN
, No Load
V
EN
= GND
I
OUT
= 300mA
I
OUT
= 150mA
I
OUT
= 100mA
I
OUT
= 10mA
3.2V
≤
V
IN
≤
5.5V, I
OUT
= 50mA
0mA
≤
I
OUT
≤
150mA
I
OUT
= 300mA
Min
2.7
-1
-2
Typ
Max
5.5
+1
+2
2
Units
V
%
V
1.5
0.15
1.3
35
12
16
17
17
2.9
0.053
100
2
300
60
1
mA
µA
V
PP
ΔV
OUT
/ΔV
IN
ΔV
OUT
/ΔI
OUT
T
SS
F
CLK
V
EN(L)
V
EN(H)
I
EN
R
OUT
T
SD
T
HYS
mV
mV/V
mV/mA
µs
MHz
V
V
µA
Ω
°C
°C
0.4
1.4
1
1
150
15
1. The AAT3183 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correla-
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