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PRODUCT DATASHEET
AAT1217
SwitchRegTM
General Description
The AAT1217 is a high efficiency, synchronous, fixed frequency, step-up converter designed for single-cell or dual-cell alkaline, NiMH, or NiCd battery-powered applications. The high 1.2MHz switching frequency and completely integrated control circuitry minimize the total solution footprint area while maintaining excellent regulation, ripple, and transient response throughout the full load range. Light load mode operation and low quiescent current allow the AAT1217 to maintain high efficiency performance for light load conditions. With a 1.2A peak inductor current limit, the AAT1217 is capable of delivering 100mA to the load from a single AA cell, 400mA from dual AA cells, or up to 500mA from a single-cell lithiumion battery. The AAT1217 has a 0.85V start-up voltage with operation down to 0.5V. The AAT1217 is available in a Pb-free, space-saving low profile (1mm) 6-pin TSOT23 or 6-pin SOT23 package and is rated over the -40C to +85C ambient temperature range.
600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Features
* * * * * * * * * * * * * * * * * VIN Operation Range: 0.5V to VOUT VOUT Range: 2.5V to 5.5V 100mA Output from a Single AA Cell Input 400mA Output from a Dual AA Cell Input 500mA Output from a Single Li+ Cell Input High Efficiency: Up to 93% Efficiency Low Start-Up Voltage: 0.85V Typical Internal Synchronous Rectifier VOUT 4.5V: No External Schottky Diode Fixed Frequency Pulse Width Modulation (PWM) CurrentMode Control Scheme with Internal Compensation 1.2MHz Fixed Switching Frequency 1.2A Current Limit Light Load Mode Operation Over-Current Protection EMI Reduction Anti-Ringing Control Circuitry Low Shutdown Current: <1.0A -40C to +85C Ambient Temperature Range Low Profile (1mm) TSOT23-6 or SOT23-6 Package
Applications
* * * * * * Cellular and Smart Phones Digital Still and Video Cameras Microprocessors and DSP Core Supplies MP3 Player Portable Instruments Wireless and DSL Modems
Typical Application
L1 4.7H
L1 4.7H
VIN 0.85V VIN R3 1M
SW VOUT
VOUT 3.3V,100 mA C OUT 4.7F
VIN 0.85V
SW VIN VOUT
VOUT 3.3V, 100 mA
C IN 4.7F
AAT1217-1.2
SHDN GND FB
R1 1.02M R2 604k
C IN 4.7F
R3 1M
AAT1217-3.3
SHDN GND FB
C OUT 4.7F
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PRODUCT DATASHEET
AAT1217
SwitchRegTM
Pin Descriptions
Pin #
1 2 3 4 5 6
600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Symbol
SW GND FB SHDN VOUT VIN
Function
Power Switch Pin. Ties to the drains of the PMOS synchronous rectifier and the NMOS switch. Ground Pin Feedback Input Pin. Connect FB to the center point of the external resistor divider. The feedback threshold voltage is 1.23V. Shutdown Signal Input. Logic high enables the IC. Logic low disables the IC. Shutdown current is <1A. Power Output Pin. Tied to the source of the PMOS synchronous rectifier. Power Supply Input. Must be closely decoupled to GND, Pin 2, with a 4.7F or greater ceramic capacitor.
Pin Configuration
TSOT23-6/SOT23-6 (Top View)
SW
1
6
VIN VOUT SHDN
GND FB
2
5
3
4
2
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PRODUCT DATASHEET
AAT1217
SwitchRegTM 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Absolute Maximum Ratings1
Symbol
VIN VSW VFB, VSHDN VOUT TA TSTORAGE TLEAD TJ
Description
Input Supply Voltage SW Voltage FB, SHDN Voltages VOUT Voltage Operating Ambient Temperature Range2 Storage Temperature Range Lead Temperature (Soldering, 10s) Operating Junction Temperature Range2
Value
-0.3 to 6 -0.3 to 6 -0.3 to 6 -0.3 to 6 -40 to 85 -65 to 150 300 -40 to 150
Units
V V V V C C C C
Thermal Information3
Symbol
JA PD
Description
Maximum Thermal Resistance Maximum Power Dissipation TSOT23-6 SOT23-6 TSOT23-6 SOT23-6
Value
190 150 526 667
Units
C/W mW
1. Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 2. TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + PD x JA. 3. Mounted on an FR4 board.
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PRODUCT DATASHEET
AAT1217
SwitchRegTM 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Electrical Characteristics1
VIN = 1.2V, VOUT = 3.3V, TA = 25C, unless otherwise noted. Symbol
VIN VOUT VFB VOUT/ VOUT/VIN
Description
Minimum Start-Up Voltage Minimum Operating Voltage Output Voltage Range Output Voltage Accuracy3 Reference Voltage Reference Voltage Line Regulation
Conditions
IOUT = 1mA VSHDN = VIN
Min
Typ
0.85 0.5
Max
1 0.65 5.5 +4
Units
V V % V %/V
2.5 IOUT = 10mA; TA = -40C to +85C TA = -40C to +85C VIN = 1.2V to 2.4V, IOUT = 10mA, VOUT = 3.3V VIN = 2.4V to 4.2V, IOUT = 10mA,VOUT = 5.0V VIN = 1.2V, IOUT = 10mA to 100mA, VOUT = 3.3V VIN = 3.6V, IOUT = 10mA to 400mA, VOUT = 5.0V VSHDN = 0 Measured on VOUT, VSHDN = VIN VSW = 5V VSW = 0V VOUT = 3.3V VOUT = 5V VOUT = 3.3V VOUT = 5V -4 1.192 1.230 0.2 0.4 0.003
1.268
VOUT/ VOUT/IOUT IQ ILNMOS ILPMOS RDS(ON)L RDS(ON)H ICL t(ICL) DMAX FOSC VSHDN ISHDN TSD
Reference Voltage Load Regulation Quiescent Current (Shutdown) Quiescent Current (Active) NMOS Switch Leakage PMOS Switch Leakage NMOS Switch ON Resistance PMOS Switch ON Resistance NMOS Current Limit Current Limit Delay to Output Maximum Duty Cycle Switching Frequency SHDN Input Low SHDN Input High SHDN Input Current Thermal Shutdown
%/mA 0.004 0.01 300 0.1 0.1 0.35 0.30 0.60 0.55 1200 40 85 1.2 1.5 0.35 1 1 500 5 5 A A A mA ns % MHz V A C
750 VFB = 1.15V, TA = -40C to +85C TA = -40C to +85C 80 0.9 1.00 VSHDN = 5.5V Hysteresis
0.01 160 20
1. Specifications over the temperature range are guaranteed by design, characterization, and correlation with statistical process controls. 2. Not including the current into internal resistance divider. 3. For fixed 3.3V and 5.0V output voltage version. The adjustable output voltage is guaranteed by reference voltage accuracy.
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PRODUCT DATASHEET
AAT1217
SwitchRegTM 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Typical Characteristics
Efficiency vs. Output Current
(VOUT = 3.3V; TA = 25C)
100 90 80 100
Efficiency vs. Output Current
(VOUT = 5V; TA = 25C) VIN = 2.4V VIN = 1.2V VIN = 1.5V
VIN = 2.4V Efficiency (%) VIN = 1.5V VIN = 1.2V
90 80 70 60 50 40 30 20 10 0 0.1
Efficiency (%)
VIN = 3.6V
70 60 50 40 30 20 10 0 0.1 1 10 100 1000
1
10
100
1000
Output Current (mA)
Output Current (mA)
Output Voltage vs. Output Current
(VOUT = 3.3V; TA = 25C)
3.5 5.2
Output Voltage vs. Output Current
(VOUT = 5V; TA = 25C)
Output Voltage (V)
3.4
Output Voltage (V)
5.1
VIN = 1.2V
3.3
VIN = 1.5V
VIN = 2.4V
VIN = 1.2V
VIN = 1.5V
VIN = 2.4V VIN = 3.6V
5
3.2
4.9
3.1
0
100
200
300
400
500
600
4.8
0
100
200
300
400
500
600
Output Current (mA)
Output Current (mA)
Minimum Start-Up Voltage vs. Output Current
(VOUT = 3.3V; TA = 25C)
1.5
Maximum Output Current vs. Input Voltage
(L = 4.7H; TA = 25C)
1000
Start-Up Voltage (V)
Maximum Output Current (mA)
1.35 1.2 1.05 0.9 0.75 0.6 0 20 40 60 80 100 120 140 160 180 200
800 600 400 200 0 0.5
VOUT = 3.3V VOUT = 5V
1
1.5
2
2.5
3
3.5
4
4.5
Output Current (mA)
Input Voltage (V)
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PRODUCT DATASHEET
AAT1217
SwitchRegTM 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Typical Characteristics
No Load Input Current vs. Input Voltage
(VOUT = 3.3V; TA = 25C; No Load)
1000 900 3.35 3.34
Output Voltage vs. Temperature
Input Current (A)
Output Voltage (V)
1 1.5 2 2.5 3
800 700 600 500 400 300 200 100 0
3.33 3.32 3.31 3.3 3.29 3.28 3.27 3.26 3.25 -50 -25 0 25 50 75 100
Input Voltage (V)
Temperature (C)
Light Load Mode Operation
(VIN = 1.8V; VOUT = 3.3V; IOUT = 5mA) VSW 2V/div
Anti-Ringing Operation at SW
(VIN = 2.4V; VOUT = 5V; IOUT = 20mA)
VSW 2V/div
0V
0V
VOUT 50mV/div (AC)
Time (1ms/div)
Time (400ns/div)
(VIN = 1.5V; VOUT = 3.3V; CFF = 100pF)
Load Transient Response
IOUT 50mA/div
0A
100mA 40mA
VOUT 100mV/div (AC) Time (100s/div)
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PRODUCT DATASHEET
AAT1217
SwitchRegTM 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Functional Block Diagram
VIN VIN Start-Up Oscillator Slope Compensation L1 SW
+
VOUT GOOD 2.3V - MUX
VOUT
VOUT
+
CIN -
Current Sense COUT To VIN Bandgap 1.23V Antiringing Control PWM Logic R1
R2
+ +
FB - EA - Comp
GND
SHDN Shutdown Control Oscillator 1.2MHz
Functional Description
The AAT1217 is a synchronous step-up DC-DC converter. It utilizes internal MOSFET switches to achieve high efficiency over the full load current range. It operates at a fixed switching frequency of 1.2MHz, and uses the slope compensated current mode pulse width modulation (PWM) architecture. The device can operate with an input voltage below 1V; the typical start-up voltage is 0.85V.
rectifier is realized by a P-channel MOSFET (PMOS) with gate control circuitry that incorporates relatively complicated timing concerns. An external Schottky diode is required when the output voltage is greater than 4.5V.
Low Voltage Start-Up
The AAT1217 can start-up with supply voltages down to 0.85V. During start-up, the internal low voltage start-up circuitry controls the internal NMOS switch. The AAT1217 leaves the start-up mode once VOUT exceeds 2.3V. An internal comparator (VOUT GOOD) monitors the output voltage and places the chip into normal operation once VOUT exceeds 2.3V. The AAT1217's control circuitry is biased by VIN during start-up and biased by VOUT once VOUT exceeds VIN. When VOUT exceeds VIN, the AAT1217's operation will be independent of VIN.
Synchronous Rectification
The AAT1217 integrates a synchronous rectifier to improve efficiency as well as to eliminate the need for an external Schottky diode. The synchronous rectifier is used to reduce the conduction loss contributed by the forward voltage of an external Schottky diode. The synchronous
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PRODUCT DATASHEET
AAT1217
SwitchRegTM
Current Mode Operation
The AAT1217 is based on a slope compensated current mode PWM control topology. It operates at a fixed frequency of 1.2MHz. At the beginning of each clock cycle, the main switch (NMOS) is turned on and the inductor current starts to ramp. After the maximum duty cycle or the sense current signal equals the error amplifier (EA) output, the main switch is turned off and the synchronous switch (PMOS) is turned on. This control topology features cycle-by-cycle current limiting which can prevent the main switch from overstress and the external inductor from saturating.
600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Application Information
Adjustable Output Voltage
An external resistor divider is used to set the output voltage. The output voltage of the switching regulator (VOUT) is determined by the following equation:
R1 VOUT = 1.23V * 1 + R2
Table 1 lists the recommended resistor values for particular output voltage settings. VOUT
3.3V 5.0V
Light Load Mode Operation
At very light load, the AAT1217 automatically switches into light load mode operation to improve efficiency. During this mode, the PWM control will skip some pulses to maintain regulation. If the load increases and the output voltage drops, the device will automatically switch back to normal PWM mode and maintain regulation.
R1()
1.02M 1.02M
R2()
604k 332k
Table 1: Resistor Selection for Output Voltage Setting.
Fixed Output Voltage
The AAT1217 has two fixed output voltage options: 3.3V and 5V. An internal resistor divider is connected to the FB pin inside the package which eliminates the need for external feedback resistors. When designing with the fixed output voltage option, remember to leave the FB pin open; otherwise the output voltage will be affected. However, a feed-forward capacitor can still be added between the FB and VOUT pins to enhance the control loop performance.
Anti-Ringing Control
An anti-ringing circuitry is included to remove the high frequency ringing that appears on the SW pin when the inductor current goes to zero. In this case, a ringing on the SW pin is induced due to remaining energy stored in parasitic components of switch and inductor. The antiringing circuitry clamps the voltage internally to the battery voltage and therefore dampens this ringing.
Device Shutdown
When SHDN is set logic high, the AAT1217 is put into active mode operation. If SHDN is set logic low, the device is put into shutdown mode and consumes less than 1A of current. After start-up, the internal circuitry is supplied by VOUT, however, if shutdown mode is enabled, the internal circuitry will be supplied by the input source again.
Inductor Selection
The high switching frequency of 1.2MHz allows for small surface mount inductors. For most applications, the AAT1217 operates with inductors from 2.2H to 10H. Use the following equations to select the proper inductor value for a particular application condition:
IL IPEAK = IDC + 2 IDC = IL = IL = IOUT * VOUT * VIN
VIN * D VOUT - VIN ; D= L * FSW VOUT VIN * (VOUT - VIN) L * FSW * VOUT
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PRODUCT DATASHEET
AAT1217
SwitchRegTM
IPEAK =
IPEAK IDC IL IOUT VOUT VIN
600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
IOUT * VOUT VIN * (VOUT - VIN) * VIN + 2L * FSW * VOUT
X7R and X5R ceramic capacitors are ideal for this function. To minimize stray inductance, the capacitor should be placed as close as possible to the IC. This keeps the high frequency content of the input current localized, minimizing EMI and input voltage ripple. Always examine the ceramic capacitor DC voltage coefficient characteristics to get the proper value. For example, the capacitance of a 10F, 6.3V, X5R ceramic capacitor with 5.0V DC applied is actually about 6F. A laboratory test set-up typically consists of two long wires running from the bench power supply to the evaluation board input voltage pins. The inductance of these wires, along with the low-ESR ceramic input capacitor, can create a high Q network that may affect converter performance. This problem often becomes apparent in the form of excessive ringing in the output voltage during load transients which can produce errors in loop phase and gain measurements. Since the inductance of a short printed circuit board (PCB) trace feeding the input voltage is significantly lower than the power leads from the bench power supply, most actual applications do not exhibit this problem. In applications where the input power source lead inductance cannot be reduced to a level that does not affect the converter performance, a high ESR tantalum or aluminum electrolytic capacitor should be placed in parallel with the low ESR, ESL bypass input ceramic capacitor. The introduction of the high ESR capacitor dampens the high Q network and stabilizes the AAT1217.
D FSW L
Peak Inductor Current DC Component (Average) of the Inductor Current Peak-Peak Inductor Ripple Current Output (Load) Current Output Voltage Input Voltage AAT1217 Efficiency (consult the performance graphs in the "Typical Characteristics" section of the data sheet) Steady-State Duty Cycle Switching Frequency Inductor Value
For a given chosen inductor value and application conditions make sure the peak inductor current does not exceed the maximum current rating of the selected vendor's inductor. For optimum load transient and efficiency, low DCR inductors should be selected. Table 2 lists some typical surface mount inductors that are suitable for typical AAT1217 applications.
Input Capacitor
A surface mount 4.7F or greater, X5R or X7R, ceramic capacitor is suggested for the input capacitor. The input capacitor provides a low impedance loop for the edges of pulsed current drawn by the AAT1217. Low ESR/ESL
Part Number
Sumida CDH28D11/S
L (H)
2.2 4.7 10 2.2 4.7 10 2.2 4.7 10 2.2 4.7 10 2.2 4.7 10 4.7 10
Max DCR (m)
123 238 431 140 (typ) 246 (typ) 446 (typ) 100 190 410 71.2 108.7 182 31.3 72 128 45 90
Rated DC Current (A)
1.15 0.75 0.53 1.12 0.8 0.55 1 0.74 0.49 1.75 1.15 1.04 2.04 1.32 1 1.87 1.33
Size WxLxH (mm)
3x3.3x1.2
Coiltronics SD3112
3.1x3.1x1.2
TDK VLF3012A
2.8x2.6x1.2
Sumida CR43
4.3x4.8x3.5
Sumida CDRH4D28 Toko D53LC
5.0x5.0x3.0 5.0x5.0x3.0
Table 2: Typical Surface Mount Inductors.
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PRODUCT DATASHEET
AAT1217
SwitchRegTM
Output Capacitor
The output capacitor limits the output ripple and provides holdup during large load transitions. A 4.7F to 10F, X5R or X7R, ceramic capacitor is suggested for the output capacitor. Typically the recommended capacitor range provides sufficient bulk capacitance to stabilize the output voltage during large load transitions and has the ESR and ESL characteristics necessary for low output voltage ripple. In addition, the output voltage droop during load transient is dominated by the capacitance of the ceramic output capacitor. During a step increase in load current, the ceramic output capacitor alone supplies the load current until the loop responds. Within several switching cycles, the loop responds and the inductor current increases to match the load current demand. Larger output capacitor values help to reduce the voltage droop during large load current transients.
600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Load Disconnect in Shutdown
In conventional synchronous step-up converters, a conduction path exists from input to output through the backgate (body diode) of the P-channel MOSFET during shutdown. Special application circuitry can disconnect the load from the battery during shutdown (see Figure 1).
PCB Layout Guidance
The AAT1217 typically operates at 1.2MHz. This is a considerably high frequency for DC-DC converters. PCB layout is important to guarantee satisfactory performance. It is recommended to make traces of the power loop, especially where the switching node is involved, as short and wide as possible. First of all, the inductor, input and output capacitor should be as close as possible to the device. Feedback and shutdown circuits should avoid the proximity of large AC signals involving the power inductor and switching node. The optional rectifier diode (D1 in Figure 1) can improve efficiency and alleviate the stress on the integrated MOSFETs. The diode should also be close to the inductor and the chip to form the shortest possible switching loop. While the two-layer PCB shown in Figures 2 and 3 is enough for most applications, large and integral multi-layer ground planes are ideal for high power applications. Large areas of copper have lower resistance and help to dissipate heat. The converter's ground should join the system ground to which it supplies power at one point only. Figure 1 is the schematic for a highly efficient load disconnect application circuit for the AAT1217. An example PCB layout for the AAT1217 is shown in Figures 2 and 3.
External Diode Selection
An external Schottky diode is required when the output voltage is above 4.5V. The Schottky diode is optional for output voltages 4.5V, but can improve efficiency by about 2% to 3%.
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PRODUCT DATASHEET
AAT1217
SwitchRegTM 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
L1 4.7H 1 VIN 0.85V SW 6 VIN VOUT 5 Q1 Si2305 DS R4 510k FB GND 2 R3 510k ON/OFF Control 3 VOUT 3.3V,100mA D1 MBR0520
AAT1217
CIN 4.7F 4 SHDN
R1 1.02M R2 604k
COUT 4.7F
Q2 2N3904
Figure 1: AAT1217 High Efficiency Load Disconnect Application Circuit.
Figure 2: AAT1217 Evaluation Board Layout Example Top Layer.
Figure 3: AAT1217 Evaluation Board Layout Example Bottom Layer.
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PRODUCT DATASHEET
AAT1217
SwitchRegTM
Ordering Information
Output Voltage1
Adj. Fixed 3.3V Fixed 5.0V Fixed 3.3V
600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
Package
TSOT23-6 TSOT23-6 TSOT23-6 SOT23-6
Marking2
VZMYY WAMYY WBMYY 3CXYY
Part Number (Tape and Reel)3
AAT1217ICA-1.2-T1 AAT1217ICA-3.3-T1 AAT1217ICA-5.0-T1 AAT1217IGU-3.3-T1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/about/quality.aspx.
Package Information
TSOT23-6
0.40 0.10 0.95 BSC
Detail "A" 2.80 BSC 1.60 BSC
End View Top View
2.90 BSC 0.25 BSC
0.127 BSC 1.00 +10 -0 0.45 0.15
1.00 0.10
0.000
+ 0.100 - 0.000
Side View
Detail "A"
All dimensions in millimeters.
1. Please contact sales for other voltage options. 2. YY = Manufacturing Date Code. 3. Sample stock is generally held on part numbers listed in BOLD.
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PRODUCT DATASHEET
AAT1217
SwitchRegTM 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter
SOT23-6
2.85 0.15 1.90 BSC 0.95 BSC
1.575 0.125
1.10 0.20
2.80 0.20 1.20 0.25
0.075 0.075
0.15 0.07 4 4
GAUGE PLANE
10 5 0.40 0.10 x 6
0.60 REF
0.45 0.15
0.10 BSC
All dimensions in millimeters.
Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611
(c) Advanced Analogic Technologies, Inc. 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. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. 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. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
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