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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications General Description
The AAT3112 is a member of AnalogicTech's Total Power Management ICTM (TPMICTM) family. It is a dual voltage doubling charge pump that provides a regulated output voltage. It operates with an input voltage range of 2.7 to 5.0 volts. The device can deliver a constant 200mA output load current and up to 500mA of pulsed current. The 500mA peak current capability of the AAT3112 makes it ideal for white LED flash applications. A low external parts count (two 1F flying capacitors and two small capacitors at VIN and VOUT) makes the AAT3112 ideally suited for small battery-powered applications. The AAT3112 has a thermal management system to protect the device in the event of a short-circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during startup. A high charge pump switching frequency enables the use of very small external capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1A. The AAT3112 is available in a 16-pin 3x3mm QFN package and is rated over the -40C to +85C temperature range.
Features
*
ChargePumpTM
* * * * * * * * * * *
Input Voltage Range: * AAT3112-5.0: 2.7V to 5.0V * AAT3112-4.5: 2.7V to 4.5V Up to 500mA Peak Output Current 200mA Continuous Output Current IQ <1A in Shutdown Regulated 4.5V or 5.0V Output 26A of Quiescent Current Small Application Circuit Automatic Soft Start No Inductors Short-Circuit/Over-Temperature Protection 16-Pin 3x3mm QFN Package Temperature Range: -40C to +85C
Applications
* * * General-Purpose High-Current Boost Supply White LED Backlighting White LED Photo Flash
Typical Application
C1 = 1F C2 = 1F
C1+
C1-
C2 +
C2 VOUT1
VIN
CIN
VIN
VOUT2
C OUT
AAT3112
D1
Enable Light EN1
D2
D3
D4
Enable Flash
EN2 GND
RB
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Pin Descriptions
Pin #
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 EP
Symbol
N/C C2+ C2N/C VIN GND EN2 N/C EN1 GND VIN VOUT1 N/C C1+ C1VOUT2
Function
No connect. Flying capacitor 2 positive terminal. Connect 1F capacitor between C2+ and C2-. Flying capacitor 2 negative terminal. No connect. Input voltage. Connect to Pin 11. Ground connection. Enable pin. When connected high, Charge Pump 2 is enabled. When connected low, it disables the charge pump. No connect. Enable pin. When connected high, Charge Pump 1 is enabled. When connected low, it disables the charge pump. Ground connection. Input voltage. Connect to Pin 5. Output pin for regulated output voltage. Bypass this pin to ground with a low ESR 10F capacitor. No connect. Flying capacitor 1 positive terminal. Connect 1F capacitor between C1+ and C1-. Flying capacitor 1 negative terminal. Regulated output voltage 2. Must be connected to VOUT1 for higher current applications. If used separately, bypass this pin to ground with a low ESR 10F capacitor. Exposed paddle (bottom); connect to GND directly beneath package.
Pin Configuration
QFN33-16 (Top View) N/C C1+ C1VOUT2
16 15 14 13
N/C C2+ C2N/C
1 2 3 4 5 6 7 8
12 11 10 9
VOUT1 VIN GND EN1
N/C EN2 GND VIN
2
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Absolute Maximum Ratings1
Symbol
VIN VOUT VEN TJ TLEAD
Description
Input Voltage Charge Pump Output EN to GND Voltage Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec)
Value
-0.3 to 6 -0.3 to 6 -0.3 to 6 -40 to 150 300
Units
V V V C C
Note 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.
Thermal Information
Symbol
PD JA
Description
Maximum Power Dissipation Maximum Thermal Resistance1
Value
2.0 50
Units
W C/W
Note 1: Mounted on an FR4 board.
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Electrical Characteristics
VIN = 3.3V, VOUT = 5.0V, CIN = COUT = 10 F, C1 = C2 = 1.0F; TA = -40C to 85C, unless otherwise noted. Typical values are TA = 25C. Symbol Description Conditions Min Typ Max Units
AAT3112-4.5 Input Power Supply VIN Operation Range IQ Quiescent Current ISHDN Shutdown Current IOUT VOUT
2.7
2
Pulsed Output Current Output Voltage
2.7 VIN 4.5, IOUT = 0 mA; EN1 = EN2 = VIN EN1 = EN2 = 0 VIN = 3.6V; VOUT = 4.0V; TPULSE = 50mS VIN = 3.6V; VOUT =4.0V; TPULSE = 500mS 2.7 VIN 4.5, IOUT = 100mA 3.0 VIN 4.5, IOUT = 200mA
26 590 500 4.5 4.5 750 80
4.5 60 1.0
V A A mA
4.32 4.32
4.68 4.68
V
Charge Pump Section FCLK Clock Frequency CP Charge Pump Efficiency EN VEN(L) Enable Threshold Low VEN(H) Enable Threshold High IEN EN Input Leakage AAT3112-5.0 Input Power Supply VIN Operation Range IQ Quiescent Current 2 ISHDN Shutdown Current Pulsed Output Current IOUT VOUT Charge Pump FCLK CP EN VEN(L) VEN(H) IEN Output Voltage Section Clock Frequency Charge Pump Efficiency Enable Threshold Low Enable Threshold High EN Input Leakage
VIN = 2.7V; IOUT = 100mA
KHz % 0.3 V V A
1.4 -1.0
1.0
2.7 2.7 VIN 5.0, IOUT = 0 mA; EN1 = EN2 = VIN EN1 = EN2 = 0 VIN = 3.6V; VOUT = 4.5V; TPULSE = 50mS VIN = 3.6V; VOUT =4.5V; TPULSE = 500mS 2.7 VIN 5.0, IOUT = 100mA 3.0 VIN 5.0, IOUT = 200mA 26 600 500 5.0 5.0 750 85
5.0 60 1.0
V A A mA
4.8 4.8
5.2 5.2
V
VIN = 2.7V; IOUT = 100mA
KHz % 0.3 V V A
1.4 -1.0
1.0
Notes: 1. The AAT3112 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. VOUT1 and VOUT2 are pulled high to prevent switching.
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Typical Characteristics
VIN=3.5V, CIN=COUT=10F, C1=C2=1F, TA=25C, unless otherwise noted. VIN vs. VIH
1.00 1.00 0.95 0.90 0.85 0.95
VIN vs. VIL
-40C 25C VIL (V)
0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50
-40C 25C
VIH (V)
0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.0
85C
85C
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Input Voltage (V)
VSHDN Threshold vs. Supply Voltage
1.00 0.95
VSHDN Threshold (V)
0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 0.50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIH
VIL
Input Voltage (V)
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Typical Characteristics-AAT3112-4.5V
VIN=3.5V, CIN=COUT=10F, C1=C2=1F, TA=25C, unless otherwise noted. Output Voltage vs. Output Current
5.0 30
Supply Current vs. Supply Voltage
(No Load, No Switching)
Supply Current (A)
4.9
Output Voltage (V)
4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 0
25 20 15 10 5 0
VIN = 3.6V
VIN = 3.9V
VIN = 4.2V
50
100
150
200
250
300
2.5
3.0
3.5
4.0
4.5
Output Current (mA)
Supply Voltage (V)
Startup Time with 100mA Load
Startup Time with 200mA Load
EN (2V/div)
EN (2V/div)
VOUT (1V/div)
VOUT (1V/div) 50s/div 50s/div
Maximum Current Pulse (50ms pulse) vs. Input Voltage, VOUT > 4.0V
Maximum Current Pulse (mA)
800 700 600 500 400 300 3 3.2 3.4 3.6 3.8 4 4.2
Efficiency vs. Supply Voltage
85 80
50mA
Efficiency (%)
75 70 65 60 55 50 45 40
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
200mA 100mA
Input Voltage (V)
Input Voltage (V)
6
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Typical Characteristics-AAT3112-4.5V
VIN=3.5V, CIN=COUT=10F, C1=C2=1F, TA=25C, unless otherwise noted. Load Transient Response
(VIN = 3.0V) IOUT (200mA/div)
Load Transient Response
(VIN = 4.2V)
IOUT (200mA/div)
VOUT (20mV/div)
VOUT (20mV/div)
50s/div
50s/div
Input and Output Ripples
(IOUT = 50mA @ VIN = 3.5V)
Input and Output Ripples
(IOUT = 100mA @ VIN = 3.5V)
VIN AC Coupled (20mV/div) VOUT AC Coupled (20mV/div)
VIN AC Coupled (20mV/div) VOUT AC Coupled (20mV/div)
5s/div
5s/div
Output Current vs. Input Voltage
(500ms Pulse Time; VOUT > 4.0V)
800 800
Output Current vs. Input Voltage (70C)
(VOUT > 4.0V)
50ms 700 600 500 400 300 200 100 0 2.5 3.0 3.5 4.0 4.5 200ms 300ms 500ms 100ms
Output Current (mA)
700 600 500 400 300 200 100 0 2.5 3 3.5 4 4.5
Input Voltage (V)
Output Current (mA)
Input Voltage (V)
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Typical Characteristics-AAT3112-4.5V
VIN=3.5V, CIN=COUT=10F, C1=C2=1F, TA=25C, unless otherwise noted. Output Voltage vs. Input Voltage for Pulsed High Current, IOUT = 500mA
5 4.5
50ms Pulse 500ms Pulse
Output Voltage (V)
4 3.5 3 2.5 2 1.5 1 0.5 0 3 3.2 3.4 3.6 3.8 4 4.2
Input Voltage (V)
8
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Typical Characteristics-AAT3112-5.0V
VIN=3.5V, CIN=COUT=10F, C1=C2=1F, TA=25C, unless otherwise noted. Output Voltage vs. Output Current
5.5 30
Supply Current vs. Supply Voltage
(No Load, No Switching)
Supply Current (A)
5.4
Output Voltage (V)
5.3 5.2 5.1 5.0 4.9 4.8 4.7 4.6 4.5 0 50 100 150 200 250 300 VIN = 3.6V VIN = 4.2V VIN = 3.9V
25 20 15 10 5 0 2.5 3.0 3.5 4.0 4.5 5.0
Output Current (mA)
Supply Voltage (V)
Startup Time with 100mA Load
Startup Time with 200mA Load
EN (2V/div)
EN (2V/div)
VOUT (1V/div)
VOUT (1V/div) 50s/div 50s/div
Maximum Current Pulse (50ms pulse) vs. Input Voltage, VOUT > 4.5V
Maximum Current Pulse (mA)
1000 900 800 700 600 500 400 300 3.0
Efficiency vs. Supply Voltage
95 90
100mA
Efficiency (%)
85 80 75 70 65 60 55 50 45 40
200mA 50mA
3.2
3.4
3.6
3.8
4.0
4.2
2.7
3.0
3.3
3.5
3.8
4.1
4.4
4.7
4.9
Input Voltage (V)
Input Voltage (V)
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Typical Characteristics-AAT3112-5.0V
VIN=3.5V, CIN=COUT=10F, C1=C2=1F, TA=25C, unless otherwise noted. Load Transient Response
(VIN = 3.0V)
Load Transient Response
(VIN = 4.2V) IOUT (200mA/div)
IOUT (200mA/div)
VOUT (20mV/div)
VOUT (20mV/div)
50s/div
50s/div
Input and Output Ripples
(IOUT = 50mA @ VIN = 3.5V)
Input and Output Ripples
(IOUT = 100mA @ VIN = 3.5V)
VIN AC Coupled (20mV/div) VOUT AC Coupled (20mV/div)
VIN AC Coupled (20mV/div) VOUT AC Coupled (20mV/div)
5s/div
5s/div
Output Current vs. Input Voltage
(500ms Pulse Time; VOUT > 4.5V)
1000 800 900
Output Current vs. Input Voltage (70C)
(VOUT > 4.5V)
50ms 700 600 500 400 300 200 100 0 200ms 300ms 500ms 100ms
Output Current (mA)
800 700 600 500 400 300 200 100 0 3.0 3.5 4.0 4.5 5.0
Output Current (mA)
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
Input Voltage (V)
10
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Typical Characteristics-AAT3112-5.0V
VIN=3.5V, CIN=COUT=10F, C1=C2=1F, TA=25C, unless otherwise noted. Output Voltage vs. Input Voltage for Pulsed High Current, IOUT = 500mA
6
Output Voltage (V)
5
50ms Pulse
4 3
500ms Pulse
2 1 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2
Input Voltage (V)
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Functional Block Diagram
V IN
S2 S1
C1 + EN1
Control Circuit
S4 S3
C1 -
VOUT1
Control Circuit
EN2
GND
S1 S2
C2+ C2S3 S4
V OUT2
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 voltage through an internal resistor divider network. The AAT3112 requires only four external components: two 1.0F ceramic capacitors for the charge pump (C1 and C2), one 10F ceramic capacitor for CIN, and one 10F ceramic capacitor for COUT.
The AAT3112 is designed to deliver 200mA of continuous 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 temperature exceeds approximately 145C.
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Applications Information
Charge Pump Efficiency
The AAT3112 is a regulated output voltage doubling charge pump. The efficiency () can simply be defined as a linear voltage regulator with an effective output voltage that is equal to two times the input voltage. Efficiency () for an ideal voltage doubler can typically be expressed as the output power divided by the input power: = POUT PIN
Capacitor Characteristics
Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT3112. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lowest cost, has a smaller PCB footprint, and is non-polarized. Low ESR ceramic capacitors help to maximize charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. Equivalent Series Resistance: ESR is an important characteristic to consider when selecting a capacitor. ESR is a resistance internal to a capacitor that is caused by the leads, internal connections, size or area, material composition, and ambient temperature. Capacitor ESR is typically measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials: Ceramic capacitors less than 0.1F are typically made from NPO or COG materials. NPO and COG materials typically have tight tolerance and are stable over temperature. Large capacitor values are typically composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors, typically greater than 2.2F, are often available in low-cost Y5V and Z5U dielectrics, but large capacitors are not required in AAT3112 applications. Capacitor area is another contributor to ESR. Capacitors that are physically large will have a lower ESR when compared to an equivalent material smaller capacitor. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size.
In addition, with an ideal voltage doubling charge pump, the output current may be expressed as half the input current. The expression to define the ideal efficiency () can be rewritten as: = -or(%) = 100 VOUT 2VIN POUT VOUT x IOUT VOUT = = PIN VIN x 2IOUT 2VIN
For a charge pump with an output of 4.5 volts and a nominal input of 2.8 volts, the theoretical efficiency is 80.4%. Due to internal switching losses and IC quiescent current consumption, the actual efficiency can be measured at 79.6%. These figures are in close agreement across a wide range of output load conditions. Efficiency will decrease as load current drops below 0.05mA or when the level of VIN approaches VOUT.
Capacitor Selection
Careful selection of the four external capacitors CIN, C1, C2, and COUT is important because they will affect turn-on time, output ripple, and transient performance. Optimum performance will be obtained when low equivalent series resistance (ESR) ceramic capacitors are used. In general, low ESR may be defined as less than 100m.
Layout Considerations
High charge pump switching frequencies and large peak transient currents mandate careful printed circuit board layout. As a general rule for charge pump boost converters, all external capacitors should be located as closely as possible to the device package with minimum length trace connections. Maximize the ground plane around the AAT3112 charge pump and make sure all external capacitors are connected to the immediate ground plane. A local component side ground plane is recommended.
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Application Circuits
C1 = 1F
C2 = 1F
C1+ C1 - C2 + VIN CIN=10F VIN
C2 VOUT COUT=10F VOUT
EN1 EN2 D1 GND D2 D3 D4
Flash LED
R2=10
Q1 TPULSE 100ms - 500ms
Figure 1: Flash Application.
C1 = 1F
C2 = 1F
C1+ C1 V IN CIN=10F Light/Movie Mode Enable VIN
C2 +
C2 VOUT COUT=10F VOUT
EN1 EN2 D1 GND R3=60 - 100 R2=10 LL4148 R1 D2 D3 D4
Flash LED
Q1 C3 0.1F
TPULSE
Flash Enable
2K
Figure 2: Movie Mode Light with Flash Function.
14
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications Ordering Information
Package QFN33-16 QFN33-16 Marking1 LGXYY MNXYY Part Number (Tape and Reel) AAT3112IVN-4.5-T1 AAT3112IVN-5.0-T1
Note 1: XYY = assembly and date code. Sample stock is held on part numbers listed in bold.
Package Information
Pin 1 Identification
1
0.240 0.060
5
3.000 0.050
Pin 1 Dot By Marking
0.400 0.100
13 9
3.000 0.050
0.500 0.050
Top View
Bottom View
0.975 0.725 0.025 0.025 0.213 0.036
Side View
All dimensions in millimeters.
0.850 0.150
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AAT3112
500mA High Efficiency Charge Pump for White LED Flash Applications
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech's standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 16
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