Datenblatt-pdf.com


AAT3112 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT3112
Beschreibung High Efficiency Charge Pump
Hersteller AAT
Logo AAT Logo 




Gesamt 16 Seiten
AAT3112 Datasheet, Funktion
AAT3112
500mA High Efficiency Charge Pump
for White LED Flash Applications
General Description
Features
ChargePump
The AAT3112 is a member of AnalogicTech's Total
• Input Voltage Range:
Power Management IC™ (TPMIC™) family. It is a
— AAT3112-5.0: 2.7V to 5.0V
dual voltage doubling charge pump that provides a
— AAT3112-4.5: 2.7V to 4.5V
regulated output voltage. It operates with an input
• Up to 500mA Peak Output Current
voltage range of 2.7 to 5.0 volts. The device can
• 200mA Continuous Output Current
deliver a constant 200mA output load current and up
to 500mA of pulsed current. The 500mA peak cur-
• IQ <1μA in Shutdown
• Regulated 4.5V or 5.0V Output
rent capability of the AAT3112 makes it ideal for
• 26μA of Quiescent Current
white LED flash applications. A low external parts
• Small Application Circuit
count (two 1μF flying capacitors and two small
• Automatic Soft Start
capacitors at VIN and VOUT) makes the AAT3112 ide-
ally suited for small battery-powered applications.
• No Inductors
• Short-Circuit/Over-Temperature Protection
The AAT3112 has a thermal management system
to protect the device in the event of a short-circuit
• 16-Pin 3x3mm QFN Package
• Temperature Range: -40°C to +85°C
condition at the output pin. Built-in soft-start circuit-
ry prevents excessive inrush current during start-
up. A high charge pump switching frequency
enables the use of very small external capacitors.
Applications
A low current shutdown feature disconnects the
load from VIN and reduces quiescent current to less
than 1μA. The AAT3112 is available in a Pb-free
16-pin 3x3mm QFN package and is rated over thewww.DataSheet4U.com
General-Purpose High-Current Boost Supply
White LED Backlighting
White LED Photo Flash
-40°C to +85°C temperature range.
Typical Application
VIN
CIN
Enable Light
Enable Flash
C1 = 1μF C2 = 1μF
C1+ C1- C2+ C2-
VIN VOUT1
VOUT2
AAT3112
EN1
EN2
GND
C OUT
D1 D2 D3 D4
RB
3112.2007.01.1.5
1






AAT3112 Datasheet, Funktion
AAT3112
500mA High Efficiency Charge Pump
for White LED Flash Applications
Typical Characteristics-AAT3112-4.5V
VIN = 3.5V, CIN = COUT = 10μF, C1 = C2 = 1μF; TA = 25°C, unless otherwise noted.
Output Voltage vs. Output Current
5.0
4.9
4.8 VIN = 3.6V VIN = 3.9V
4.7
4.6
4.5
4.4 VIN = 4.2V
4.3
4.2
4.1
4.0
0
50 100 150 200
Output Current (mA)
250
300
Supply Current vs. Supply Voltage
(No Load, No Switching)
30
25
20
15
10
5
0
2.5 3.0 3.5 4.0
Supply Voltage (V)
4.5
Startup Time with 100mA Load
EN
(2V/div)
VOUT
(1V/div)
Time (50µs/div)
Startup Time with 200mA Load
EN
(2V/div)
VOUT
(1V/div)
Time (50µs/div)
Maximum Current Pulse vs. Input Voltage
(50ms pulse; VOUT > 4.0V)
800
700
600
500
400
300
3
3.2 3.4 3.6 3.8
Input Voltage (V)
4
4.2
6
Efficiency vs. Input Voltage
85
80 50mA
75
70
65 200mA
60 100mA
55
50
45
40
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
Input Voltage (V)
3112.2007.01.1.5

6 Page









AAT3112 pdf, datenblatt
Functional Block Diagram
AAT3112
500mA High Efficiency Charge Pump
for White LED Flash Applications
VIN
EN1
EN2
C2+
C2-
Control
Circuit
Control
Circuit
S1 S2
S3 S4
S2 S1
S4 S3
C1 +
C1 -
VOUT1
GND
VOUT2
Functional Description
The AAT3112 is a dual charge pump intended for
high-current applications. This device boosts an
input voltage to a regulated output voltage.
Regulation is achieved by sensing the output volt-
age through an internal resistor divider network.
The AAT3112 requires only four external compo-
nents: two 1.0μF ceramic capacitors for the charge
pump (C1 and C2), one 10μF ceramic capacitor for
CIN, and one 10μF ceramic capacitor for COUT.
The AAT3112 is designed to deliver 200mA of con-
tinuous current and up to 500mA of pulsed current.
Each charge pump engine has an independent
enable pin to extend battery life. The charge pump
switching frequency is approximately 750kHz,
enabling the use of small external flying capacitors.
The AAT3112 has complete output short-circuit and
thermal protection to safeguard the device under
extreme operating conditions. An internal thermal
protection circuit senses die temperature and will
shut down the device if the internal junction tem-
perature exceeds approximately 145°C.
12 3112.2007.01.1.5

12 Page





SeitenGesamt 16 Seiten
PDF Download[ AAT3112 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
AAT3110MicroPower Regulated Charge PumpAdvanced Analogic Technologies
Advanced Analogic Technologies
AAT3110-33MicroPower Regulated Charge PumpAdvanced Analogic Technologies
Advanced Analogic Technologies
AAT3110-5MicroPower Regulated Charge PumpAdvanced Analogic Technologies
Advanced Analogic Technologies
AAT3110IGU-33-T1MicroPower Regulated Charge PumpAdvanced Analogic Technologies
Advanced Analogic Technologies
AAT3110IGU-5-T1MicroPower Regulated Charge PumpAdvanced Analogic Technologies
Advanced Analogic Technologies

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche