ADP3025 データシートの表示（PDF） - Analog Devices
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ADP3025 Datasheet PDF : 24 Pages
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ADP3025
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
CS5 1
38 BST5
FB5 2
37 DRVH5
EAN5 3
36 SW5
EAO5 4
35 DRVL5
ADJ/FX5 5
34 PGND1
SS5 6
33 S D
CLSET5 7 ADP3025 32 PGND2
REF
8
TOP VIEW
(Not to Scale)
31 INTVCC1
AGND 9
30 VIN
CLSET3 10
INTVCC2 11
SYNC 12
SS3 13
ADJ/FX3 14
EAO3 15
E EAN3 16
FB3 17
CS3 18
T PFI 19
29 DRVL3
28 SW3
27 DRVH3
26 BST3
25 DRV2
24 FB2
23 COMP2/SD2
22 CPOR
21 PWRGD
20 PFO
Figure 2. 38-Lead TSSOP Pin Configuration
E Table 3. Pin Function Descriptions
Pin No. Mnemonic Function
L 1
CS5
Current Sense Input for the Top N-Channel MOSFET of the 5 V Buck Converter. Connect to the drain of the top
N-channel MOSFET.
2
FB5
Feedback Input for the 5 V Buck Converter. Connect to the output sense point in fixed output mode. Connect to
an external resistor divider in adjustable output mode.
O 3
EAN5
Inverting Input of the Error Amplifier of the 5 V Buck Converter. Use for external loop compensation only in
fixed output mode. In adjustable output mode, connect to the external resistor divider.
4
EAO5
Error Amplifier Output for the 5 V Buck Converter.
5
ADJ/FX5
TTL Logic Input. When ADJ/FX5 = 0 V, fixed output mode, connect FB5 to the output sense point. When
ADJ/FX5 = 5 V, adjustable output mode, connect FB5 to the external resistor divider.
S 6
SS5
Soft Start for the 5 V Buck Converter. Also used as an ON/OFF pin.
7
CLSET5
Current Limit Setting. A resistor can be connected from AGND to CLSET5. A minimum current limit is obtained
by leaving it open. A maximum current limit is obtained by connecting it to AGND.
8
REF
800 mV Reference. Bypass it with a capacitor (22 nF typical) to AGND. REF cannot be loaded externally.
B 9
AGND
Analog Signal Ground.
10
CLSET3
Current Limit Setting. A resistor can be connected from AGND to CLSET3. A minimum current limit is obtained
by leaving it open. A maximum current limit is obtained by connecting it to AGND.
O 11, 31 INTVCC2, 1 Linear Regulator Bypass for the Internal 5 V LDO. Bypass this pin with a 4.7 µF capacitor to AGND. Pins 11 and 31
must be connected for proper operation.
12
SYNC
Oscillator Synchronization and Frequency Select. fOSC = 200 kHz when SYNC = 0 V; select fOSC = 300 kHz, when
SYNC = 5 V. The oscillator can be synchronized with an external source through the SYNC pin.
13
SS3
Soft Start for the 3.3 V Buck Converter. Also used as an ON/OFF pin.
14
ADJ/FX3
TTL Logic Input. When ADJ/FX3 = 0 V, fixed output mode, connect FB3 to the output sense point. When
ADJ/FX3 = 5 V, adjustable output mode, connect FB3 to the external resistor divider.
15
EAO3
Error Amplifier Output for the 3.3 V Buck Converter.
16
EAN3
Error Amplifier Inverting Input of the 3.3 V Buck Converter. Use for external loop compensation only in fixed
output mode. In adjustable output mode, connect to an external resistor divider.
17
FB3
Feedback Input for the 3.3 V Buck Converter. Connect to output sense point in fixed output mode. Connect to
an external resistor divider in adjustable output mode.
18
CS3
Current Sense Input for the Top N-Channel MOSFET of the 3.3 V Buck Converter. CS3 should be connected to
the drain of the N-channel MOSFET.
Rev. A | Page 6 of 24
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