BD9850FVM Datasheet PDF - Rohm


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BD9850FVM
Rohm

Part Number BD9850FVM
Description Single-output High-frequency Step-down Switching Regulator
Page 19 Pages

BD9850FVM datasheet pdf
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TECHNICAL NOTE
Large Current External FET Controller Type Switching Regulators
Single-output High-frequency Step-down
Switching Regulator(Controller type)
BD9850FVM
Dual-output Step-up, Negative, Step-down
Switching Regulator(Controller type)
BD9851EFV
High temperature
operating
Now available
ESD
Resistance
Now available
Description
The BD9850FVM is a 1-channel DC/DC step-down switching regulator controller, while the BD9851EFV is a 2-channel DC/DC
step-down switching regulator controller. The BD9850FVM is adaptable for a maximum switching frequency of 2 MHz and the
BD9851EFV for that of 3 MHz. Both provide space saving in all applications.
Features
1) Adaptable for 2-MHz switching frequency (externally variable) (BD9850FVM)
Adaptable for 3-MHz switching frequency (externally variable) (BD9851EFV)
2) FET direct drive
3) High-accuracy reference voltage (Accuracy: ±1%)
4) Built-in Under Voltage Lock Out circuit (UVLO)
5) Built-in Thermal Shutdown circuit (TSD)
6) The BD9851EFV provides two channels:
Channel 1 available for selection of step-down/step-up switching
Channel 2 available for selection of step-down/inverting switching.
7) Compact MSOP8 package (BD9850FVM) / HTSSOP-B20 package (BD9851EFV)
Applications
TFT panel, TA / Router, digital consumer electronics, PC, and portable CD/DVD/DVC
Product lineup
Input range
Oscillation frequency range
External synchronization
Standby function
Operating temperature
Package
BD9850FVM
4V to 9V
100kHz to 2MHz
Not provided
Not provided
– 40˚C to 85˚C
MSOP8
BD9851EFV
4V to 18V
10kHz to 3MHz
Not provided
Provided
–40˚C to 85˚C
HTSSOP-B20
ROHM CO., LTD .
Sep. 2008



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Absolute maximum ratings (Ta=25˚C)
BD9850FVM
Item
Symbol
Rating
Power supply voltage
Vcc
10
Storage temperature
Tstg –55 to +150
Operating temperature
Power dissipation
Topr
Pd
–40 to +85
587 *
Maximum junction temperature
Tjmax
+150
*Reduce by 4.7 mW/ºC over 25ºC (When mounted on PCB of 70mm×70mm×1.6mm)
BD9851EFV
Item
Power supply voltage
(Between Vcc and GND)
Symbol
Vcc
Rating
20
Between VREF and GND
Between OUT1 and PVcc1
Between OUT2 and PVcc2
VREF
Vouth
7
20
Between OUT1, OUT2 and PGND
Power dissipation
Voutl
Pd
20
1000 (*)
Operating temperature
Topr
–40 to +85
Maximum junction temperature
Tjmax
+150
Storage temperature
Tstg –55 to +150
(*)Reduce by 8.0 mW/ºC over 25ºC (When mounted on PCB of 70mm×70mm×1.6mm)
Unit
V
ºC
ºC
mW
ºC
Unit
V
V
V
V
mW
ºC
ºC
ºC
Recommended operating range
BD9850FVM
Item
Power supply voltage
Oscillation frequency
Operating temperature
Symbol
Vcc
fosc
Topr
BD9851EFV
Item
Power supply voltage
Oscillation frequency
Timing resistor
Timing capacitor
Symbol
Vcc
fosc
RRT
CCT
Limits
min. Typ. max.
4 79
100 – 2000
–40 – + 85
Unit
V
kHz
ºC
Limits
min. Typ. max.
4 12 18
10 300 3000
3.3 – 47
33 – 10000
Unit
V
kHz
pF
2/16



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BD9850FVM
Electrical characteristics (Unless otherwise specified, Ta=25˚C, Vcc=7V, fosc=600kHz)
Limits
Item Symbol
min. Typ. max.
[Oscillator block]
Unit
Oscillation frequency
fosc 510 600 690 kHz
Frequency regulation
FDV –5
0
5%
Oscillator amplitude voltage
Vpptr
0.5
V
[Soft start / SW block]
CTL/SS pin sink current
ISS
–1.90
–1.00
1.00
μA
CTL / SS pin clamp voltage
VSS 2.2 2.4 2.6
V
CTL threshold voltage
VCTLTH
1.2
1.3
1.4
V
[PWM comparator block]
0% threshold voltage
D0 1.5 1.6 1.7
V
100% threshold voltage
D100
2.0
2.1
2.2
V
[Error Amp block]
Threshold voltage
VIN 0.98 1.00 1.02
V
Frequency bandwidth
Voltage gain
BW 1.5 3.0
Av – 70
– MHz
– dB
Input bias current
IIB –150 –70 – hA
Maximum output voltage
VCH 2.3 2.4 2.6
V
Minimum output voltage
VCL – 0.03 0.20 V
Output source current
IOl –3.1 –1.6 –1.0 mA
Output sink current
IOO 12
50 125 mA
[VREF block]
VREF output voltage
VREF 2.475 2.500 2.525
V
FREF load regulation
ΔVREFl0
– 10 mV
VREF current capacitance
IVREF
–45
–16
–1
mA
[Total device]
Standby current
ICCS 420 610 960 μA
Average supply current
[Output block]
ICCA 3.4 5.0 7.8 mA
ON resistance
RON 0.9 2.5 8.0 Ω
Output transient time
Tr/ Tf
20
– nsec
[Under voltage lockout block]
Threshold voltage
VUT 3.7 3.8 3.9
V
Hysteresis width
VUThy 0.05 0.10 0.15
*Design guarantee
*Not designed to be radiation-resistant.
V
Conditions
RRT = 24kΩ
Vcc = 4V to 9V
*
VCTL/SS = 1.5V
fosc = 600kHz
fosc = 600kHz
AV = 0dB *
*
VFB = 1.0V
VFB = 1.0V
IVREF = 0mA
IVREF = 0mA to –1mA
At no load
Cout = 1000pF *
Vcc sweep down
3/16



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BD9851EFV
Electrical characteristics (Unless otherwise specified, Ta=25˚C, Vcc=12V, fosc=300kHz, STB=3V)
Limits
Item Symbol
Unit
min. Typ. max.
[Total device]
Conditions
Standby mode circuit current
Iccst
5 μA STB=0V
Operation mode circuit current
Icc
1.5
2.5
4.1 mA FB1, FB2=0V
[Reference voltage block]
Output voltage
VREF
2.475
2.500
2.525
V Io=–0.1mA
Input stability
DVli –
– 10 mV Vcc=4Vto18V, Io=–0.1mA
Load stability
DVlo
– 10 mV Io=–0.1mA to –1mA
Short circuit mode output current Ios – 45 –12 –3 mA
[Oscillator block]
Oscillation frequency
fosc 270 300 330 kHz RRT=24kΩ, CCT=220pF
Oscillation frequency regulation Dfosc
–2
0
2 % Vcc=4Vto18V
[Error Amp block]
Threshold voltage
Vthea
0.98
1.00
1.02
V Ch1
Input offset voltage
Vofst
–10
0
10 mV Ch2
Common-mode input voltage range Vcm
0.3
2.0
V Ch2
Input bias current
Ibias –150
–70
nA
Voltage gain
Av 60 75 90 dB DC *Design guarantee
Frequency bandwidth
Bw 3
6 13 MHz MHz *Design guarantee
Maximum output voltage
Vfbh VREF–0.1
VREF
V
Minimum output voltage
Vfbl –
– 0.1 V
Output sink current
Isink 1.6 6 16 mA FB pin
Output source current
Isource –260
–160
–90
μA FB pin
[PWM comparator block]
0% threshold voltage
Vth0 1.21 1.31 1.41
V FB voltage
100% threshold voltage
Vth100 1.74 1.84 1.94
V FB voltage
DTC bias current
Idtc –1
1 μA
[FET driver block]
ON resistance
RONN
1.5
3
3
Ω When OUT = Lo
RONP
1
2
2
Ω When OUT=Hi
SEL1 input voltage range
[Control block]
Vselh Vcc – 0.2
V In step-down switching
Vsell 0 – – V In step-down switching
Threshold voltage
Vstb 0.6 1.5 1.5
V
Sink current
Istb 6
15 15 μA STB = 3V
[Short circuit protection circuit (SCP) block]
Timer start voltage
Vtime
2.2
2.3
2.3
V FB voltage
Threshold voltage
Vthscp
1.4
1.5
1.5
V SCP voltage
Standby mode voltage
Source current
Vstscp
Vsoscp
–3.2
10 10
–2.0 –2.0
mV SCP voltage
μA SCP=0.75V
[Under voltage lockout block (UVLO)]
Threshold voltage
Hysteresis width
Vuvlo
3.58
3.7
3.7
DVuvlo 0.05 0.11 0.11
V Vcc sweep down
V
*Design guarantee
4/16




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