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ADP2105 Datasheet(PDF) 6 Page - Analog Devices

No. de Pieza. ADP2105
Descripción  1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters
Descarga  32 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADP2105 Datasheet(HTML) 6 Page - Analog Devices

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ADP2105/ADP2106/ADP2107
Rev. 0 | Page 6 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
NC = NO CONNECT
11 PGND
12 LX2
10 LX1
9PWIN2
ADP2105/
ADP2106/
ADP2107
TOP VIEW
(Not to Scale)
EN 1
GND 2
GND 3
GND 4
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Mnemonic
Pin No.
ADP210x-xx
ADP210x-ADJ
Description
1
EN
EN
Enable Input. Drive EN high to turn on the ADP2105/ADP2106/ADP2107. Drive EN low to turn
it off and reduce the input current to 0.1
μA.
2, 3, 4,
15
GND
GND
Test Pins. These pins are used by Analog Devices, Inc. for internal testing and are not ground
return pins. Tie these pins to the AGND plane as close to the ADP2105/ADP2106/ADP2107 as
possible.
5
COMP
COMP
Feedback Loop Compensation Node. COMP is the output of the internal transconductance
error amplifier. Place a series RC network from COMP to AGND to compensate the converter.
See the Loop Compensation section.
6
SS
SS
Soft Start Input. Place a capacitor from SS to AGND to set the soft start period. A 1 nF capacitor
sets a 1 ms soft start period.
7
AGND
AGND
Analog Ground. Connect the ground of the compensation components, soft start capacitor,
and the voltage divider on the FB pin to the AGND pin as close as possible to the ADP2105/
ADP2106/ADP2107. Also connect AGND to the exposed pad of ADP2105/ADP2106/ADP2107.
8
NC
NC
No Connect. Not internally connected. Can be connected to other pins or left unconnected.
9, 13
PWIN2,
PWIN1
PWIN2, PWIN1
Power Source Inputs. The source of the PFET high-side switch. Bypass each PWIN pin to the nearest
PGND plane with a 4.7 μF or greater capacitor as close as possible to the ADP2105/ADP2106/
ADP2107. See the Input Capacitor Selection section.
10, 12
LX1, LX2
LX1, LX2
Switch Outputs. The drain of the P-channel power switch and N-channel synchronous rectifier.
Tie the two LX pins together and connect the output LC filter between LX and the output
voltage.
11
PGND
PGND
Power Ground. Connect the ground return of all input and output capacitors to PGND pin,
using a power ground plane as close as possible to the ADP2105/ADP2106/ADP2107. Also
connect PGND to the exposed pad of the ADP2105/ADP2106/ADP2107.
14
IN
IN
ADP2105/ADP2106/ADP2107 Power Input. The power source for the ADP2105/ADP2106/
ADP2107 internal circuitry. Connect IN and PWIN1 with a 10 Ω resistor as close as possible to
the ADP2105/ADP2106/ADP2107. Bypass IN to AGND with a 0.1 μF or greater capacitor. See
the Input Filter section.
16
OUT_SENSE
FB
Output Voltage Sense or Feedback Input. For fixed output versions, connect OUT_SENSE to the
output voltage. For adjustable versions, FB is the input to the error amplifier. Drive FB through
a resistive voltage divider to set the output voltage. The FB regulation voltage is 0.8 V.


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