FAN5026 Просмотр технического описания (PDF) - Fairchild Semiconductor
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производитель
FAN5026 Datasheet PDF : 17 Pages
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Pin Configurations
AGND
LDRV1
PGND1
SW1
HDRV1
BOOT1
ISNS1
EN1
GND
VSEN1
ILIM1
SS1
DDR
VIN
1
28
2
27
3
26
4
25
5
24
6
23
7
22
FAN5026
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VCC
LDRV2
PGND2
SW2
HDRV2
BOOT2
ISNS2
EN2
GND
VSEN2
ILIM2/REF2
SS2
PG2/REF2OUT
PG1
TSSOP-28
θJA = 50°C/W; θJC = 16°C/W. See note below.
Note: θJA and θJC values are determined using a 4 layer, 1" square PCB with 1 ounce copper.
Pin Definitions
Pin
Number
1
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
12
17
Pin Name
AGND
LDRV1
LDRV2
PGND1
PGND2
SW1
SW2
HDRV1
BOOT1
BOOT2
ISNS1
ISNS2
EN1
EN2
GND
VSEN1
VSEN2
ILIM1
SS1
SS2
Pin Function Description
Analog Ground. This is the signal ground reference for the IC. All voltage levels are
measured with respect to this pin.
Low-Side Drive. The low-side (lower) MOSFET driver output. Connect to gate of
low-side MOSFET.
Power Ground. The return for the low-side MOSFET driver. Connect to source of
low-side MOSFET.
Switching Node. Return for the high-side MOSFET driver and a current sense input.
Connect to source of high-side MOSFET and low-side MOSFET drain.
High-Side Drive. High-side (upper) MOSFET driver output. Connect to gate of high-side
MOSFET.
BOOT. Positive supply for the upper MOSFET driver. Connect as shown in Figure 3.
Current Sense Input. Monitors the voltage drop across the lower MOSFET or external
sense resistor for current feedback.
Enable. Enables operation when pulled to logic high. Toggling EN will also reset the
regulator after a latched fault condition. These are CMOS inputs whose state is
indeterminate if left open.
Ground. These pins should be tied to AGND for proper operation.
Output Voltage Sense. The feedback from the outputs. Used for regulation as well as
PG, under-voltage and over-voltage protection and monitoring.
Current Limit 1. A resistor from this pin to GND sets the current limit.
Soft Start. A capacitor from this pin to GND programs the slew rate of the converter
during initialization. During initialization, this pin is charged with a 5µA current source.
3
FAN5026 Rev. 1.0.5
www.fairchildsemi.com
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