ETC BH6557FV

99W134A
DC/DC Converter+Reset
BH6557FV
Description
The BH6557FV is a variable output DC/DC converter
IC with reset. The DC/DC converter output voltage
value and reset voltage value can be adjusted by
external resistance.
Dimension (Units : mm)
Features
1) Synchronous rectification enables high efficiency
2) Built-in charge pump circuits for operating output power MOS
3) Built-in variable reset circuit
4) Built-in power MOS Tr requires fewer external components
5) Mute circuit built-in
6) Built-in thermal shut down circuit
7) SSOP-B16 package has a smaller board footprint
SSOP-B16
Applications
CD-ROM
Absolute Maximum Ratings (Ta=25 ˚C )
Symbol
Limits
Unit
Power MOS supply voltage
Parameter
PowVcc
9
V
Control circuit supply voltage
PrePcc
9
Pre driver supply voltage
VG(9pin)
12
V
V
Output current from DSW terminal
Power dissipation
Iswomax
1
*2
A
Pd
560
*1
mW
Operating temperature range
Topr
– 30 ~ + 85
˚C
Storage temperature range
Tstg
– 55 ~ +150
˚C
* 1 Derating : 4.5mV/˚C for operation above Ta=25 ˚C.
On less than 3% (percentage occupied by copper foil), 70mm ¥ 70mm, t=1.6mm, glass epoxy mounting.
* 2 Intermittent current at maximum applied time of 5msec, 1/10 duty (Max.)
January, 2000
Recommended Operating Conditions (Ta=25 ˚C)
Symbol
Min.
Typ.
Max.
Power MOS supply voltage
PowVcc
4.5
5.0
5.5
V
Control circuit supply voltage
PreVcc
4.5
5.0
5.5
V
VG(9pin)
Io(Variable DC/DC)
8.0
10.0
11.5
V
—
300
500
mA
–10
25
70
˚C
V
Parameter
Pre-driver supply voltage
*3
Variable DC/DC converter output current
*4
Ambient temperature
Ta
Variable DC/DC converter output voltage
Reset threshold voltage range 1
*5
Reset threshold voltage range 2
*6
Unit
VDD
1.7
—
Vcc-1
Vthrst 1
3.5
—
Vcc
V
Vthrst 2
1.25
—
Vcc
V
* 3 In case supply voltage provided outside without using charge-pump built-in.
* 4 L=47µ H, C=47µF is used.
* 5 Setting voltage range when 12pin(PreVcc) is monitored.
* 6 Setting voltage range when the desired voltage except 12pin(PreVcc) is monitored.
Electrical characteristics (Unless otherwise noted, Ta=25 ˚C, PREVCC=5V)
Parameter
Current in standby mode
Symbol
Min.
Typ.
Max.
Unit
IST
—
170
290
µA
Conditions
CE=0V
ICC
—
1.45
2.60
mA
EI terminal threshold voltage
VEITH
1.20
1.25
1.30
V
(5˚C≤ Ta ≤ 75˚C : design guaranteed)
EO terminal output voltage H
VEOH
1.48
1.68
1.88
V
IEO=–100µ A
EO terminal output voltage L
VEOL
—
0.01
0.15
V
IEO=100µA
—
0.42
0.87
Ω
IL=500mA
—
0.30
0.60
Ω
IL=–500mA
VG
7.7
9.7
11.7
V
Operating
VDETON
1.20
1.25
1.30
V
Quiescent current
DSW terminal ON resistance H RDSWONH
DSW terminal ON resistance L RDSWONL
Charge-pump output voltage
Reset detection threshold
voltage
Application circuit