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TECHNICAL NOTE
Large Current External FET Controller Type Switching Regulator
Step-down, High-efficiency Switching Regulators (Controller type)
BD9011EKN , BD9011KV , BD9775FV
■ BD901 1EKN, BD9011KV ●Overview The BD9011EKN/KV is a 2-ch synchronous controller with rectification switching for enhanced power management efficiency. It supports a wide input range, enabling low power consumption ecodesign for an array of electronics. ●Features 1) Wide input voltage range: 3.9V to 30V 2) Precision voltage references: 0.8V±1% 3) FET direct drive 4) Rectification switching for increased efficiency 5) Variable frequency: 250k to 550kHz (external synchronization to 550kHz) 6) Built-in selected OFF latch and auto remove over current protection 7) Built-in independent power up/power down sequencing control 8) Make various application , step-down , step-up and step-up-down 9) Small footprint packages: HQFN36V, VQFP48C ●Applications Car audio and navigation systems, CRTTV,LCDTV,PDPTV,STB,DVD,and PC systems,portable CD and DVD players, etc. ●Absolute Maximum Ratings (Ta=25℃) Parameter S
EXTVCC Voltage VCCCL1,2 Voltage CL1,2 Voltage SW1,2 Voltage BOOT1,2 Voltage BOOT1,2-SW1,2 Voltage STB, EN1,2 Voltage VREG5,5A VREG33 VREG SS1,2、FB1,2
ymbol
EXTVCC VCCCL1,2 CL1,2 SW1,2 BOOT1,2 BOOT1,2-SW1,2 7 STB, EN1,2 VREG5,5A 7 33 SS1,2、FB1,2
Rating
34 34
*1 *1
Unit
Parameter S
COMP1,2 Voltage
ymbol
COMP1,2 DET1,2 RT、SYNC
Rating Unit
V V V V V
DET1,2 Voltage RT、SYNC Voltage
VREG5 V
34 34 40
*1 *1
0.875 (HQFN36V) Power Dissipation Pd 1.1 (VQFP48C)
*2
*2
W
*1
V V V
W
VCC
VREG5 VREG5
V V
Operating temperature Storage temperature Junction temperature
Topr Tstg Tj +150
-40 to +105 -55 to +150
℃ ℃ ℃
*1 Regardless of the listed rating, do not exceed Pd in any circumstances. *2 Mounted on a 70mm x 70mm x 0.8mm glass-epoxy board. De-rated at 7.44mW/℃(HQFN36V) or 8.8mW/℃(VQFP48C) above 25℃.
Sep. 2008
http://www.Datasheet4U.com
●Operating conditions (Ta=25℃) Parameter S Input voltage 1 Input voltage 2 BOOT-SW voltage Carrier frequency Synchronous frequency Synchronous pulse duty Min OFF pulse
*1 After more than 4.5V, voltage range. *2 In case of using less than 6V, Short to VCC, EXTVCC and VREG5.
ymbol EXTVCC VCC BOOT-SW OSC SYNC Duty TMIN
Min. 3.9
*1 *2
Typ. 12
Max. 30 30 VREG5
Unit V V V kHz
3.9 *1 *2 12 4.5 5 250 300 550 OSC 40 50 100
550 60 -
kHz % nsec
★This product is not designed to provide resistance against radiation.
●Electrical characteristics (Unless otherwise specified, Ta=25℃ VCC=12V STB=5V EN1,2=5V) Parameter S VIN bias current Shutdown mode current [Error Amp Block] Feedback reference voltage Feedback reference voltage (Ta=-40 to 105℃) Open circuit voltage gain VO input bias current [FET Driver Block] HG high side ON resistance HG low side ON resistance LG high side ON resistance LG low side ON resistance [Oscillator] Carrier frequency Synchronous frequency [Over Current Protection Block] CL threshold voltage CL threshold voltage (Ta=-4.