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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=-40 to 105℃) [VREG Block] VREG5 output voltage VREG33 reference voltage VREG5 threshold voltage VREG5 hysteresis voltage [Soft start block] Charge current Charge current (Ta=-40 to 105℃) ISS 6.5 ISS+ 6 10 10 13.5 14 μA μA VSS=1V VSS=1V,Ta=-40 to 105℃ ※ VREG5 VREG33 VREG_UVLO DVREG_UVLO 4.8 3.0 2.6 50 5 3.3 2.8 100 5.2 3.6 3.0 200 V V V mV IREF=6mA IREG=6mA VREG:Sweep down VREG:Sweep up Vswth 70 Vswth+ 67 90 90 110 113 mV mV Ta=-40 to 105℃ ※ FOSC Fsync 270 300 500 330 kHz kHz RT=100 kΩ RT=100 kΩ,SYNC=500kHz HGhon HGlon LGhon LGlon 1.5 1.0 1.5 0.5 Ω Ω Ω Ω VOB 0.792 VOB+ Averr IVo+ 0.784 0.800 0.800 46 0.808 0.816 1 V V dB μA Ta=-40 to 105℃ ※ ymbol IIN IST Limit Min. T yp. 5 0 Max. 10 10 Unit Con mA μA VST B=0V ditions
Note: Not all shipped products are subject to outgoing inspection. 2/29
●Reference data (Unless otherwise specified, Ta=25℃)
100 90 80 EFFICIENCY[%] 70 60 50 40 30 20 10 0 0123 1.8V 1.2V 2.6V 3.3V
5.0V
100 90 3.3V CIRCUIT CURRENT[mA] 80 70 EFFICIENCY[%] 60 50 40 30 20
6 5
5.0V
4 3 2 1 0
105℃
25℃
-40℃
VIN=12V
10 0 6 9
Io=2A
12 15 18 21 INPUT VOLTAGE : VIN[V] 24
01
OUTPUT CURRENT:Io[A]
0 20 INPUT VOLTAGE:VIN[V]
30
Fig.1 Ef ficiency 1
Fig.2 Ef ficiency 2
Fig.3 Circu it current
0.816 REFERENCE VOLTAGE : VOB[V] : Vswth[mV] 0.812 0.808 0.804 0.800 0.796 0.792 0.788 0.784 -40 -15 10 35 60 85 110 AMBIENT TEMPERATURE : Ta[℃]
110
OSILATIN G FREQUENCY : F OSC[kHz]
330 320 310 300 290 280 270
RT=100kΩ
100
90 80
70 60 -40 -15 10 35 60 85 110 AMBIENT TEMPERATURE : Ta[℃]
-40
-15
10
35
60
85
110
AMBIENT TEMPERATURE : Ta[℃]
Fig.4 Refer ence voltage vs. temperature characteristics
5.25 5.00 OUT PUT VOLTAGE : Vo[V]
Fig.5 O ver current detection vs. temperature characteristics
6 5
OUT PUT VOLTAGE : Vo[V] 3.0 2.5
Fig.6 F requency vs. temperature characteristics
4.75 4.50 4.25 4.00 3.75 3.50 3.25 3.00 -40 -15 10
OUT PUT VOLTAGE : Vo[V]
VREG5
5.0V
4 3
RCL=15mΩ
2.0 1.5
3.3V
2 1 0 0 5 10 15 20 INPUT VOLTAGE : VIN[V] 25
LOFF=H
1.0
VRE.