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| 型号： | ADP1875ARQZ-0.3-R7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件页数： | 42/44页 |
| 文件大小： | 2475K |
| 代理商： | ADP1875ARQZ-0.3-R7 |
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ADP1874/ADP1875
Rev. 0 | Page 7 of 44
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
VIN 1
COMP 2
EN 3
FB 4
BST
16
SW
15
DRVH
14
PGND
13
GND 5
DRVL
12
RES 6
PGOOD
11
VREG 7
SS
10
VREG_IN 8
TRACK
9
ADP1874/
ADP1875
TOP VIEW
(Not to Scale)
09
34
7-
0
3
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin
No.
Mnemonic
Description
1
VIN
High-Side Input Voltage. Connect VIN to the drain of the upper-side MOSFET.
2
COMP
Output of the Error Amplifier. Connect the compensation network between this pin and AGND to achieve stability
(see the Compensation Network section).
3
EN
Connect to VREG to Enable IC. When pulled down to AGND externally, disables the IC.
4
FB
Noninverting Input of the Internal Error Amplifier. This is the node where the feedback resistor is connected.
5
GND
Analog Ground Reference Pin of the IC. All sensitive analog components should be connected to this ground plane
(see the Layout Considerations section).
6
RES
Current Sense Gain Resistor (External). Connect a resistor between the RES pin and GND (Pin 5).
7
VREG
Internal Regulator Supply Bias Voltage for the ADP1874/ADP1875 Controller (Includes the Output Gate Drivers). A
bypass capacitor of 1 μF directly from this pin to PGND and a 0.1 μF across VREG and GND are recommended.
8
VREG_IN
Input to the Internal LDO. Tie this pin directly to Pin 7 (VREG).
9
TRACK
Tracking Input. If the tracking function is not used, it is recommended to connect TRACK to VREG through a resistor
higher than 1 MΩ or simply connect TRACK between 0.7 V and 2 V to reduce the bias current going into the pin.
10
SS
Soft Start Input. Connect an external capacitor to GND to program the soft start period. Capacitance value of 10 nF for
every 1 ms of soft start delay.
11
PGOOD
Open-Drain Power Good Output. Sinks current when FB is out of regulation or during thermal shutdown. Connect a
3 kΩ resistor between PGOOD and VREG. Leave unconnected if not used.
12
DRVL
Drive Output for the External Lower-Side, N-Channel MOSFET. This pin also serves as the current-sense gain setting
pin (see Figure 69).
13
PGND
Power GND. Ground for the lower-side gate driver and lower-side, N-channel MOSFET.
14
DRVH
Drive Output for the External Upper-Side, N-Channel MOSFET.
15
SW
Switch Node Connection.
16
BST
Bootstrap for the Upper-Side MOSFET Gate Drive Circuitry. An internal boot rectifier (diode) is connected between
VREG and BST. A capacitor from BST to SW is required. An external Schottky diode can also be connected between
VREG and BST for increased gate drive capability.
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