AP5100 Datasheet PDF - Diodes Incorporated

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AP5100
Diodes Incorporated

Part Number AP5100
Description 1.2A Step-Down Converter
Page 12 Pages


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Features
AP5100www.DataSheet4U.com
1.2A Step-Down Converter with 1.4MHz Switching
Frequency
General Description
VIN 4.75V to 24V
Load current of up to 1.2A
Internal Power MOSFET
Stable with Low ESR Ceramic Output Capacitors
Up to 90% Efficiency
0.1µA Shutdown Mode
Fixed 1.4MHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Resistor divider adjustable Output: 0.81V to 15V
SOT26: Available in “Green” Molding Compound
(no Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
The AP5100 is a current mode step-down converter with a built-in
power MOSFET to enable smallest solution size power
conversion.
With the low series resistance power switch it enables a constant
output current of up to 1.2A over a wide input supply range. The
load and line regulation has excellent response time over the
operating input voltage and temperature range.
The AP5100 is self protected, through a cycle-by-cycle current
limiting algorithm and an on chip thermal protection.
The AP5100 will provide the voltage conversion with a low count
of widely available standard external components.
The AP5100 is available in SOT26 package.
Applications
Distributed Power Systems
Battery Charger
Pre-Regulator for Linear Regulators
WLED Drivers
Typical Applications
VIN
C1
ON
OFF
5 IN
BST 1
6
SW
AP5100
4 EN
FB 3
GND
C3 .L1
D1
R1
R2
VOUT
C6
C2
Figure 1. Typical Application Circuit
AP5100
Document number: DS32130 Rev. 1 - 2
1 of 12
www.diodes.com
MARCH 2010
© Diodes Incorporated



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AP5100www.DataSheet4U.com
1.2A Step-Down Converter with 1.4MHz Switching
Frequency
Typical Applications (Continued)
VIN
C1
10µF
25V
R3
100kohm
OFF ON
5 IN
BST 1
C3
22nF
AP5100 SW 6
D1
B230A
4 EN GND FB 3
L1
3.3µH
R1
49.9kohm
R2
16.2kohm
C6
100pF
VOUT
3.3V
C2
22µF
6.3V
Figure 2. 1.4MHz, 3.3V Output at 1A Step-Down Converter
VIN
6V -12V
C1
10µF
25V
R3
100Kohm
OFF ON
5 IN
BST 1
AP5100 SW
C3
10nF
6
D1
L1
10µH
1N5819HW-7
4 EN GND FB
- Vout
- Vout
3
R4
200Kohm
1%
- Vout
R2
40 ohm
1%
- Vout
Figure 3. White LED Driver Application
C2
10µF
16V
LED1
LED 2
LED 3
AP5100
Document number: DS32130 Rev. 1 - 2
2 of 12
www.diodes.com
MARCH 2010
© Diodes Incorporated



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Ordering Information
AP5100www.DataSheet4U.com
1.2A Step-Down Converter with 1.4MHz Switching
Frequency
AP5100 W G - 7
Package
W : SOT26
Green
G : Green
Packing
7 : Tape & Reel
Device
AP5100WG-7
Package
Code
W
Packaging
(Note 2)
SOT26
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Pin Assignments
( Top View )
BST 1
6 SW
GND 2
5 IN
FB 3
74 EN
SOT26
AP5100
Document number: DS32130 Rev. 1 - 2
3 of 12
www.diodes.com
MARCH 2010
© Diodes Incorporated



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Pin Descriptions
AP5100www.DataSheet4U.com
1.2A Step-Down Converter with 1.4MHz Switching
Frequency
Pin Name
BST
GND
FB
EN
IN
SW
Pin #
1
2
3
4
5
6
Description
Bootstrap. To form a boost circuit, a capacitor is connected between SW and BST
pins to form a floating supply across the power switch driver. This capacitor is needed
to drive the power switch’s gate above the supply voltage. Typical values for CBST
range from 0.1uF to 1uF.
Ground. This pin is the voltage reference for the regulated output voltage. All control
circuits are referenced to this pin. For this reason care must be taken in its layout.
Feedback. To set the output voltage, connect this pin to the output resistor divider or
directly to VOUT. To prevent current limit run away during a current limit condition, the
frequency foldback comparator lowers the oscillator frequency when the FB voltage is
below 400mV.
On/Off Control Input. Do not leave this pin floating. To turn the device ON, pull EN
above 1.2V and to turn it off pull below 0.4V.
If enable/disable is not used, connect a 100kOhm resistor between EN to VIN.
Supply Voltage. The AP5100 operates from a +4.75V to +24V unregulated input. A
decoupling capacitor C1 is required to prevent large voltage spikes from appearing at
the input. Place this capacitor near the IC.
Switch Output. This is the reference for the floating top gate driver.
Absolute Maximum Ratings (Note 3)
Symbol
Description
ESD HBM Human Body Model ESD Protection
ESD MM
VIN
VSW
Machine Model ESD Protection
Supply Voltage
Switch Voltage
VBST
Boost Voltage
All Other Pins
TST Storage Temperature
TJ Junction Temperature
TL Lead Temperature
θJA Junction to Ambient Thermal Resistance (Note 4)
θJC Junction to Case Thermal Resistance (Note 4)
Notes: 3. Exceeding these ratings may damage the device.
4. Test condition for SOT26: Measured on approximately 1” square of 1 oz copper.
Rating
3
300
26
-0.3 to VIN + 0.3
VSW + 6
–0.3 to +6
-65 to +150
+150
+260
140
35
Unit
KV
V
V
V
V
V
°C
°C
°C
°C/W
°C/W
AP5100
Document number: DS32130 Rev. 1 - 2
4 of 12
www.diodes.com
MARCH 2010
© Diodes Incorporated



AP5100 datasheet pdf
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AP5100 pdf
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