Document
PWM Buck Regulator, Synchronous, Voltage Mode, High Performance, 65 V, 6 A
FAN65004B
www.onsemi.com
Description
FAN65004B is a wide VIN highly efficient synchronous buck
regulator, with integrated high side and low side power MOSFETs.
The device incorporates a fixed frequency voltage mode PWM
controller supporting a wide voltage range from 4.5 V to 65 V and can
handle continuous currents up to 6 A. FAN65004B includes a 0.67% accurate reference voltage to achieve
tight regulation. The switching frequency can be programmed from
PQFN35 6x6 CASE 483BE
100 kHz to 1 MHz. To improve efficiency at light load condition, the
device can be set to discontinuous conduction mode with pulse
MARKING DIAGRAM
skipping operation.
FAN65004B has dual LDOs to minimize power loss and integrated current sense circuit that provides cycle−by−cycle current limiting. This single phase buck regulator offers complete protection features including Over current protection, Thermal shutdown, Under−voltage lockout, Over voltage protection, Under voltage protection and Short
ZXYYKK FAN
65004B
1
−circuit protection.
FAN65004B uses ON Semiconductor’s high performance PowerTrench® MOSFETs that reduces ringing in switching applications. FAN65004B integrates the controller, driver, and power
MOSFETs into a thermally enhanced, compact 6 x 6 mm PQFN
Z
= Assembly Location
X
= Year / Lead Free
YY
= Week
KK
= Lot
FAN65004B = Specific Device Code
package. With an integrated approach, the complete DC/DC converter
is optimized from the controller and driver to MOSFET switching performance, delivering a high power density solution.
Features
ORDERING INFORMATION
See detailed ordering and shipping information on page 23 of this data sheet.
• Wide Input Voltage Range: 4.5 V to 65 V
• Continuous Output Current: 6 A
• Fixed Frequency Voltage Mode PWM Control with Input Voltage
Feed−forward
• High Performance Low Profile 6 mm x 6 mm PQFN
• 0.6 V Reference Voltage with 0.67% Accuracy • Adjustable Switching Frequency: 100 kHz to 1 MHz
Package
• This Device is Pb−Free and RoHS Compliant
• Dual LDOs for Single Supply Operation and to Reduce
Power Loss
• Selectable CCM PWM Mode or PFM Mode for Light
Loads
• External Compensation for Wide Operation Range • Adjustable Soft−Start & Pre−Bias Startup • Enable Function with Adjustable Input Voltage
Under−Voltage−Lock−Out (UVLO)
Applications
• High Voltage POL Module • Telecommunications: Base Station Power Supplies • Networking: Computing, Battery Management
Systems, USB−PD
• Industrial Equipment: Automation, Power Tools, Slot
Machines
• Power Good Indicator
• Over Current Protection, Thermal Shutdown, Over
Voltage Protection, Under Voltage Protection and
Short−circuit Protection
© Semiconductor Components Industries, LLC, 2017
1
November, 2019 − Rev. 2
Publication Order Number: FAN65004B/D
FAN65004B
TYPICAL APPLICATION
R2
C2
R3
EN / UVLO
C4 PVCC
R4 C5
VCC
MODE C6
SS
RT R6
R7
PWM Controller with Driver
RBOOT C3
HVBIAS BOOT
ILIM AGND PGND
PH VIN
C1 VCC
SYNC
R5
PGOOD
EXTBIAS L
SW
C7 COMP
R8
C8 FB
VIN
4.5 V~65 V
VO
R9 R10 C10
C9 R11
Figure 1. Typical Application
Table 1. APPLICATION DESIGN EXAMPLE
CO from
L to be VO_RIPPLE CO from CO from CO to be
R11
VIN (V) VO (V) L (mH) used (mH)
(mF)
VOS (mF) VUS (mF) used
R10 (W)
(W)
R9 R8 C9 C7 C8 (W) (W) (F) (F) (F)
Phase
fCO margin
RT
(Hz)
(⁰) (=R6) (W)
35
24 16.762
2.6
30.9
65.2
718.2
18.0k 69.4
35
28 12.444
2.2
22.7
83.5
613.4
22.6k 67.5
35
30 9.524
2.1
19.8
103.6
571.6
22.6k 67.5
48
24 26.667
2.6
30.9
30.9
718.2
48
28 25.926 22.00
2.2
22.7
31.4
75.2
28010 613.4 365 1.0k 2.7n 220n 470p
3.75E+04
48
30 25.000
2.1
19.8
32.3
571.6
60
24 32.000
2.6
30.9
20.8
718.2
60
28 33.185
2.2
22.7
19.9
613.4
60
30 33.333
2.1
19.8
19.8
571.6
NOTE: *Iout = 5 A, Fsw = 300 KHz
www.onsemi.com 2
FAN65004B
BLOCK DIAGRAM
Figure 2. Block Diagram www.onsemi.com 3
ILIM 14
EN/ 22
UVLO
Sleep Mode/ UVLO/POR
Peak Current Limiting (PCL)
SS 17 FB 15
VCC PVCC
I SEN
Pre−bias Startup
Soft Start
V REF
PCL E/A
PWM Operation
SW
and Frequency
Sync Control
13 MODE
SYNC 21
RT
GND VCC HVBIAS
19
18
23
27
GND 25
PVCC 24
EXTBIAS 26
BOOT 29
VIN 1−3, 31−35
Ramp Generator
VCC VIN Feed−forward
LDO1
LDO2 UVLO
High−side I SEN
Ramp Comparator
PWM Control
Fault
FB V REF
Fault / Power Good
Control
16 COMP
20 PGOOD
Level Shift
PCL
Deadtime Control
Over Temp Protection PCL
Low−side
PVCC
I
12 LG
4−6
7−10
28 VINMON 30 PH
SW PGND
FAN65004B
PIN CONFIGURATION
HVBIAS VINMON BOOT PH VIN VIN VIN VIN VIN
EXTBIAS GND
PVCC VCC
EN/UVLO SYNC
PGOOD RT
GND SS
27 28 26 25
29 30
31 32 33 34 35 1 VIN 2 VIN
24 3 VIN
23
22
4 PGND
21
20
5 PGND
19
12
18
6 PGND
17 16 15 14 13
11 10 9 8 7
COMP FB
ILIM MODE
LG NC SW SW SW SW
Figure 3. Pin Assignment (Bottom View)
Table 2..