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TECHNICAL NOTE
System Power Supply for TV Series
FET Controller Type 3ch System Power Supply ICs
BD8606FV
Description
BD8606FV has realized the high performance and reliability required as a power supply for thin-screen TV. Due to the high-speed load response, it is most suitable for TV-purpose processors with increasingly high performance, and due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application design. As a high-reliability design, it has various built-in protection circuits (overcurrent protection, output voltage abnormal protection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for thin-screen TV which requires the high reliability.
Features
1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 3ch synchronous rectification step-down system DC/DC converter controller 3ch independent ON/OFF. controllable Soft start, soft off function Concentrated protection control with built-in sequencer Built-in low voltage protection function Built-in overvoltage protection function Built-in overcurrent protection function Built-in RT terminal open/short protection function Frequency setting by external resistance is available. Protection condition is output from PDET terminal. Built-in external reset output function
Aug. 2008
Electric characteristic (Ta=25, VIN1, VIN2, VIN3=5.0V, VCC=5.0V, and GND=0V unless otherwise specified.)
Parameter
Circuit current 1 Circuit current 2
Symbol IQ1 IQ2 VREF IFBB VFCH VFCL IFCSINK IFCSOURCE AVERR FOSC ISS VSSTH VSSCLM VSSSTB VSSSTB_HYS RSS VSSPON VSSPON_HYS VLVP VLVP_HYS VOVP ILXB IOCPB VRSTO IMONVCCB IRSTDLY VOL_RST VOL_RDET VIH_CTL VIL_CTL II_CTL VOH_DRV VOL_DRV
MIN 0.792 -1 1.8 0.5 100 -4.0 1.0 1.44 0.11 5 49 1.0 10 0.27 10 1.08 -1 20 0.98 -1 -15 2.0 4.5 -
specification value TYP MAX 2.5 5 5.0 10 0.8 0 100 -2.5 1.1 1.72 0.15 50 70 1.1 100 0.32 100 1.2 0 50 1.0 0 -10 40 0.808 1 0.2 -70 600 -1.0 1.2 2.0 0.19 100 91 1.2 200 0.37 200 1.32 1 80 1.02 1 -5 0.4 0.4 VCC 0.5 70 0.5
UNIT mA mA V A V V mA A B kHz A V V V mV k V mV V mV V uA uA V uA uA V V V V uA V V
Condition CTL1,2,3=0V CTL1,2,3=VCC
Terminal FB and FC terminal short
< Error amplifier part Ch1,Ch2,Ch3 >
Standard voltage VREF Terminal FB Input bias current Terminal FC Clamping voltage H Terminal FC Clamping voltage L Terminal FC Sink current Terminal FC Source current Open loop gain
VFB=0.9V VFB=0.7V VFB=0.9V VFB=0.9V, VFC=0.4V VFB=0.7V, VFC=1.6V
< OSC part >
Oscillation frequency
< Soft start part Ch1,Ch2,Ch3 >
Charging current Terminal SS Threshold voltage Terminal SS Clamping voltage Terminal SS Standby voltage Terminal SS Standby voltage Maximum hysteresis error Terminal SS Discharge resistance Terminal SS Protection circuit start voltage Terminal SS Protection circuit start voltage Maximum hysteresis error Terminal FB Low voltage detection voltage Terminal FB Low voltage detection Maximum hysteresis error Terminal FB Overvoltage detection voltage Terminal LX input bias current Terminal OCP input bias current
VSS=1.0V VSS voltage, VFC=0.8V VSS voltage (LH)
VSS voltage (LH) VSS voltage VFB voltage VFB voltage VFB voltage
< Low voltage, over voltage detection part Ch1,Ch2,Ch3 >
< Over current detection part Ch1,Ch2,Ch3 > < Reset detection part >
Terminal MONVCC reset detection voltage Terminal MONVCC input bias current Terminal RSTDLY charging current Terminal RESET L output voltage
VMONVCC voltage (HL)
IOL=100uA IOL=100uA Terminal CTL1,2,3 Terminal CTL1,2,3 Terminal CTL1,2,3, CTL=VCC Terminal DRV1A,2A,3A,1B,2B,3B Terminal DRV1A,2A,3A,1B,2B,3B
< Others >
Terminal PDET L output voltage Terminal CTL input voltage H level voltage Terminal CTL input voltage L level voltage Terminal CTL input current Terminal DRV H output voltage Terminal DRV L output voltage
VFB : FB terminal voltage, VFC : FC terminal voltage, VSS : SS terminal voltage, VMONVCC : MONVCC terminal voltage Not designed for radiation resistance.
Current capability should not exceed Pd.
2 / 22
Block diagram
MONVCC RSTDLY PGND3 RESET DRV3A DRV3B TEST2 TEST1 OCP3 PDET PGND1 CTL3 CTL2 CTL1 GND VIN3 VCC SS3 FC3 FB3 LX3
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
VRSTO Delay OVP1.5 LVP0.4 VREF
SYSTEM CONTROL SEQUENCER
Driver Control
SS1 SS2 SS3 Driver Control OVP1.5 LVP0.4 OVP1.5 LVP0.4 VREF VREF OSC Driver Control
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
LX1
GND
VIN2
LX2
Terminal explanation
Table 1 terminal explanation No. Symbol
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Ch1 power GND PGND1 (same potential as GND terminal) DRV1B Ch1 Nch drive output terminal LX1 Ch1 overcurrent detection terminal
DRV1A Ch1 Pch drive output terminal VIN1 Ch1 power supply input terminal Ch1 overcurrent detection level OCP1 resistance connection terminal FB1 Ch1 voltage detection terminal FC1 Ch1 phase compensation terminal Ch1 soft start adjustment capacity SS1 connection terminal GND GND (0V connection) Frequency adjustment resistance RT connection terminal Ch2 soft start adjustment capacity SS2 connection terminal FC2 Ch2 phase compensation terminal FB2 Ch2 voltage detection terminal Ch2 overcurrent detection level resistance OCP2 connection terminal VIN2 Ch2 power supply input terminal DRV2A Ch2 Pch drive output terminal LX2 Ch2 overcurrent detection terminal
DRV2B Ch2 Nch drive output terminal Ch2 power GND PGND2 (same potential as terminal GND)
Please give to VCC+0.3V as an operation condition in all input terminals. However, please do not exceed the absolute maximum rating as VCC=VIN1=VIN2=VIN3.
DRV1B
VIN1
FC1
SS1
RT
FB2
OCP2
OCP1
SS2
DRV1A
Description
FB1
FC2
DRV2A
DRV2B
PGND2
Figure 1 Block char
No.
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Symbol
Description
Ch3 power GND PGND3 (same potential as terminal GND) DRV3B Ch3 Nch drive output terminal LX3 DRV3A VIN3 OCP3 FB3 FC3 SS3 GND TEST1 TEST2 CTL1 CTL2 CTL3 VCC RESET Ch3 overcurrent detection terminal Ch3 Pch drive output terminal Ch3 power supply input terminal Ch3 overcurrent detection level resistance connection terminal Ch3 voltage detection terminal Ch3 phase compensation terminal Ch3 soft start adjustment capacity connection terminal GND (0V connection) Test terminal (Connect to GND) Test terminal (connect to GND) Ch1 control terminal Ch2 control terminal Ch3 control terminal
Power supply input terminal Reset output terminal Reset delay adjustment capacity RSTDLY connection terminal MONVCC VCC monitor terminal PDET Off latch signal output
3 / 22
Terminal equivalent circuit chart
Terminal No. 1 20 21 Terminal name PGND1 PGND2 PGND3 Explanation Ch1 Power GND (GND Terminal and this potential) Ch2 Power GND (GND Terminal and this potential) Ch3 Power GND (GND Terminal and this potential) Ch1 Nch Driving output terminal Terminal equivalent circuit chart
2
DRV1B
VIN
VIN
19
DRV2B
Ch2 Nch Driving output terminal

22
22
DRV3B
Ch3 Nch Driving output terminal
PGND
PGND
VIN VIN
3
LX1
Ch1
Over current detection terminal
VIN
18
LX2
Ch2
Over current detection terminal

23
23
LX3
Ch3
Over current detection terminal
PGND
VIN1
4 DRV1A Ch1 Pch Driving output terminal
VIN1
17
DRV2A
Ch2 Pch Driving output terminal

24
24
DRV3A
Ch3 Pch Driving output terminal
PGND
5 VIN1 Ch1 Power supply input terminal
PGND
16
VIN2
Ch2
Power supply input terminal
25
VIN3
Ch3
Power supply input terminal
4 / 22
Terminal No.
Terminal name
Explanation
Terminal equivalent circuit chart
VCC
6 OCP1 Ch1 Over current detection level Set resistance connection terminal
VIN1

15 OCP2 Ch2 Over current detection level Set resistance connection terminal
26
GND
26 OCP3 Ch3 Over current detection level Set resistance connection terminal
7
FB1
Ch1
Voltage detection terminal
VCC
14
FB2
Ch2
Voltage detection terminal

27
27
FB3
Ch3
Voltage detection terminal
GND
VCC
8
FC1
Ch1
Phase amends terminal

28
13
FC2
Ch2
Phase amends terminal
GND
28
FC3
Ch3
Phase amends terminal
5 / 22
Terminal No..
Terminal name
Explanation
Terminal equivalent circuit chart
9
SS1
Ch1 Soft start Adjustment capacity connection terminal
VCC
12
SS2
Ch2 Soft start Adjustment capacity connection terminal

29
29
SS3
Ch3 Soft start Adjustment capacity connection terminal
GND
10 30
GND GND
GND 0V Connection GND 0V Connection
VCC
11
RT
Frequency adjustment resistance connection terminal
GND
31
TEST1
Test terminal
VCC
32 TEST2 Test terminal
31 32 33 34 35
33
CTL1
Ch1 Control terminal
34
CTL2
Ch2 Control terminal
GND
35 CTL3 Ch3 Control terminal
6 / 22
Terminal No. 36
Terminal name VCC
Explanation
Terminal equivalent circuit chart
Power supply input terminal
VCC
37
RESET
Reset output terminal
37
GND
VCC
38
RSTDLY
Reset Delay Adjustment capacity connection terminal
38
GND
VCC
39
MONVCC
VCC Monitor terminal
39
GND
VCC
40
PDET
Off latch output terminal
40
GND
7 / 22
Circuit chart
PGND3
PGND2
DRV3B
21
22
Driver Control
Driver Control
LX3
DRV3A
23
VIN3
24
25
OCP3
26
FB3
VREF
VREF
FC3
27
28
SS3
GND OSC OVP1.5 LVP0.4 SYSTEM CONTROL SEQUENCER SS1 SS2 SS3 VREF
29
TEST1
30
TEST2
31
32
CTL1
33
CTL2
34
CTL3
35
VCC
36
RESET
5
DRV1A
6
VIN1
7
OCP1
8
FB1
9
FC1
10
SS1
11
GND
12
RT
OVP1.5 LVP0.4
OVP1.5 LVP0.4
13
SS2
14
FC2
15
FB2
16
OCP2
17
VIN2
18
DRV2A
19
LX2
20
DRV2B
37
RSTDLY Delay
38
MONVCC
39
PDET
VRSTO
40
It measures it by the static test mode. The circuit chart of CH2 and CH3 is omitted. Figure 2 Circuit chart
8 / 22
1
2
Driver Control
3
4
PWM Counter
LX1
DRV1B
PWM Counter
PGND1
20
19
18
17
16
15
14
13
12
11
OSC
10
9
8
7
6
5
4
3
2
1
Figure 3 Application circuit chart
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Application circuit chart
9 / 22
SYSTEM CONTROL SEQUENCER SS1 SS2 SS3
VRSTO
Delay
. Each characteristic reference data
0.900
ERROR AMP REFERENCE VOLTAGE : VREF[V]
0.875 0.850 0.825 0.800 0.775 0.750 0.725 0.700 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
AMBIENT TEMPERATURE : Ta[]
SWITCHING FREQUENCY : fosc[kHz]
600 550 500 450 400 350 300 250 200 150 100 -40 -30 -20 -10 0 10 20 30 40
RT=27k
50 60 70 80
AMBIENT TEMPERATURE : Ta[]
Figure 4 Standard voltage-temperature characteristic
100 80 60 40 GAIN [dB] 20 0 -20 -40 -60 -80 -100 1000 10000 100000
f [H z] Gain Phase
Figure 5 Switching frequency-temperature characteristic
4.0
SS CHARGE CURRENT : Iss[A]
180 135 90 45 0 -45 -90 -135 -180
1000000 10000000
3.5 3.0 2.5 2.0 1.5 1.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Ph ase [de g]
AMBIENT TEMPERATURE : Ta[]
Figure 6 Open loop characteristic
80 OCP INPUT CURRENT : Iocp[A] 70 60 50 40 30 20
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Figure 7 Terminal SS charge current-temperature characteristic
15
RSTDLY CHARGE CURRENT : Irstdly[A]
14 13 12 11 10 9 8 7 6 5 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80
AMBIENT TEMPERATURE : Ta[]
AMBIENT TEMPERATURE : Ta[]
Figure 8 Terminal OCP inflow current-temperature characteristic
1.10
Figure 9 Terminal RSTDLY charge current-temperature characteristic
1000
1.05
Vrsto[V]
1.00
PWM FREQUENCY [kHz]
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
100
0.95
0.90
10 10 100 1000
AMBIENT TEMPERATURE : Ta[]
RT RESISTANCE [k]
Figure 10 MONVCC reset detection voltage-temperature characteristic
5V CTL
Figure 11 Switching frequency-terminal RT resistance characteristic
100 90 POWER EFFICIENCY[%] 80 70 60 50 40 30 20 10 0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
3.4ms
1.72V
SS 3.3V
Vo
VIN=5.0V Vo=3.3V External FETSP8M4 Drive
LOAD CURRENT[A]
Css=6800pF
Figure 12 Soft start crimp
Figure 13 Efficiency
10 / 22
Reference data of dead time
Figure 14 Dead time (VCC=5.0V,VIN=5.0V,Ta=25)
Parameter Symbol
PchMOS OFFNchMOS ON Dead time NchMOS OFFPchMOS ON Dead time
200
Trdeat Tfdeat
200
min 90 100
typ 120 140
max 160 190
UNIT
ns ns
VCC=4.0V
VCC=4.0V
150 150
VCC=5.0V
Trdeat [nsec]
VCC=5.0V
Tfdeat [nsec]
VCC=7.0V
VCC=7.0V
100
100
50 -40 -20 0 20 40 60 80
50 -40 -20 0 20 40 60 80
AMBIENT TEMPERATURE : Ta[]
AMBIENT TEMPERATURE : Ta[]
Figure 15 Dead time Trdeat - Temperature characteristic
Figure 16 Dead time Tfdeat - Temperature characteristic
(pcs) 7 6 5 4 3 2 1 0 2 4 6 VCC=VIN=5.0V Ta=25 n=12(2lot)
(pcs) 7 6 5 4 3 2 1 0 1 5 6 VCC=VIN=5.0V Ta=25 n=12(2lot)
90
98 95 93
Figure 17 Dead time Trdeat - Difference
105 103 100
113 110 108
120 118 115
Trdeat[ns]
128 125 123
135 133 130
143 140 138
150 148 145
158 155 153
160
11 / 22
190 188 185 183 180 178 175 173 170 168 165 163 160 158 155 153 150 148 145 143 140 138 135 133 130 128 125 123 120 118 115 113 110 108 105 103 100
Tfdeat[ns]
Figure 18 Dead time Tfdeat - Difference
Reset detection data
Figure 19 Circuit chart
Figure 20 Reset detection (VCC=5V,Ta=25)
Parameter Symbol
Terminal MONVCC reset detection voltage Terminal MONVCC reset detection voltage Maximum hysteresis error
VRSTO VRST_HYS
min 0.98 20
typ 1.0 72
max 1.02 180
UNIT
V mV
12 / 22
Permissible loss Tcmax jc [/W] ja [/W] TSTGmin [ ] TSTGmax [ ] Ta min [ ] Ta max [ ] Tj max
Destruction Destruction temperature temperature [ ] [ ] 150.0 150.0
28.0
111.1
-50.0
150.0
-45.0
85.0
1.2
1 Permissible loss Pd [W]
0.8
ROHM standard substrate mounting ja=111.1/W
0.6
0.4
0.2
0 0 25 50 75 100 125 150 Ambient temperature Ta []
ROHM standard substrate specification Material The glass epoxy Size 70mmx70mmx1.6mmt
Figure 2 Heat decrease curve
These values are the example values, and no guarantee values.
13 / 22
Operation description
ON/OFF control DC/DC converter controller ON/OFF function DC/DC converter controller of each Ch can be independently controlled ON/OFF by CTL1, CTL2, and CTL3 terminal. Analog circuit of Ch interlocked to each CTL terminal starts operation at ON control (on mode), and goes down to setting output voltage. Analog circuit of Ch interlocked to each CTL terminal should be standby at OFF control (off mode), and output voltage becomes 0V. Table1 DC/DC converter controller ON/OFF function
CTL1 terminal voltage Ch1 CTL2 terminal voltage Ch2 CTL3 terminal voltage Ch3 >VIHCTL1 ON control >VIHCTL2 ON control >VIHCTL3 ON control Soft start time set function DC/DC converter controller of each Ch can do soft start without overshoot by charging soft start capacity (Css) connected between ss terminal and GND in each Ch by charging current at ON control. The mute of the output is released when it reaches VSS=0.15V (VSSSTB), and the output voltage does the soft start operation from the point of VSS=0.3V (typ) in proportion to the voltage of the terminal SS. Also, soft start time (tss) can be set by setting soft start capacity arbitrarily. Soft start time (tss) should be set at 3msec < tss < 30msec. Please note that the overshoot is not caused in the output setting voltage when setting it to tss3msec.
t
SS
= 400us
1.1V x C
SS 2.5uA
Discharge function DC/DC converter controller of each Ch can do soft off by discharging load discharged to soft start capacity connected between SS terminal to GND by discharging resistance at OFF control. Soft off operates in proportion to the voltage of the terminal SS the output voltage from the point of VSS=0.8V (typ).
2.0V
CTL terminal voltage
1.9V 1.1V
0.5V
0.8V
SS terminal voltage
0.15V
0.3V
Output voltage
Mute release
tss
Figure 22 Wave form at ON/OFF control
14 / 22
OSC oscillation frequency setting function DRVA and DRVB output oscillation frequency of DC/DC converter controller of each Ch can be set by installing resistance between RT terminal and GND externally.
10000
[KHz Switching frequency[KHz]
1000
100
10 1 10 100 1000 * *reference data
RT terminal resistance[K] RT[K]
Figure 23 Terminal RT resistance-oscillation frequency
Off latch signal output function PDET terminal outputs condition of off latch when protection operation of DC/DC converter controller of each Ch operates. Table 2 PDET terminal off latch signal output function Protection operation Terminal PDET ON LOW OFF Hi-Z
15 / 22
Reset output function Reset output function observes voltage value from MONVCC terminal and does reset operation compared to internal reference level. Set MONVCC terminal external resistance to make VCC voltage more than 5.0V at reset release. Table 3 DC/DC converter controller ON/OFF function MONVCC terminal voltage RESET terminal LOW 1.0V(typ) Hi-Z 1.072V(typ)
Delay time until detecting reset release is settable by capacitor connected to RSTDLY terminal.
1.235V C RSTDLY IR S T D L Y
TRSTDLY
Figure 24 Reset operation ( TRSTDLYDelay time until detecting reset release )
16 / 22
Output Duty Output Duty of DRVA of the DC/DC converter controller of each Ch is decided depending on the voltage of the terminal FC of each Ch.
Setting output Duty
Output setting voltage 100 [%] VIN voltage
9% Setting output Duty 92%
Duty [%]
Figure 25 FC Voltage-Output Duty Linearity
17 / 22
Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection operation. Low voltage protection function(LVP) Low voltage protection function detects output voltage VO set in each Ch from FB terminal of each Ch and off-latched all DC/DC converter controller compared to internal reference level. Low voltage protection function operates when FB terminal voltage falls below VLVP (=1.5 x VREF) and continues about more than 400sec (typ). Table 4 Low voltage protection function CTL Low voltage Low voltage SS terminal FB terminal terminal protection function protection operation >VIHCTL >1.1V(typ) VLVP+VLVP_HYS OFF <1.0V(typ) Disable OFF Constant voltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the transition to ON control (during soft start).
Overvoltage protection function(OVP) Overvoltage protection function detects output voltage VO set in each Ch from FB terminal of each Ch and off-latched all DC/DC converter controller compared to internal reference level. Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.5 x VREF) and continues about more than 400sec (typ). Table 5 Overvoltage protection function CTL Overvoltage Overvoltage SS terminal FB terminal terminal protection function protection operation >VIHCTL >1.1V(typ) >VOVP ON Effective Overvoltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the transition to ON control (during soft start).
Figure 26 Low voltage and over voltage protection
18 / 22
Overcurrent protection function(OCP) Overcurrent protection function compared drain voltage (LX terminal voltage) with OCP terminal voltage when external Pch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS would be OFF. Up to 50uA (typ) of constant current from OCP terminal is synchronized. Overcurrent detection level (OCP terminal voltage) can be set arbitrarily by external resistance value. Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and continues about more than 400sec (typ). Table 6 overcurrent protection function CTL LX terminal Overcurrent SS terminal terminal voltage protection function >VIHCTL >1.1V(typ) VOCP <1.0V(typ) Disable Overcurrent protection operation ON OFF OFF OFF
LX terminal Voltage
OCP terminal Voltage
Immediately off
Immediately off
Immediately off
DRVA
DRVB
Output current
Output current
LX
Rocp
Protection
ON OFF
400usec (typ) to an off latch in continuance
400usec
OCP
Immediately off operation
Off latch
Figure 27 Overcurrent protection
19 / 22
Terminal FC abnormality protection function
FCHP=1.95V(typ) 1.5V(typ) Internal triangular wave FC 0.9V(typ) FCLP=0.62V(typ)
About 400usec(typ) continuance and an off latch.
About 400usec(typ)
Off latch
The terminal FC abnormality protection function Ofrattis it all DC/DC converter controller detecting the continuance of the state that FC which is the difference input of PWMCOMP does not intersect with an internal triangular wave. The terminal FC abnormality protection function is exceeded 1.95V(typ) by the voltage of the terminal FC or operates when it falls below 0.62V(typ), and about 400usec(typ) or more continues. CTL terminal
> VIHCTL
SS terminal
> 1.1V(typ) < 1.0V(typ)
Protection operation Enable Disable
FC terminal
> 1.95V(typ) 0.62V(typ) < , < 1.95V(typ) < 0.62V(typ) -
Terminal FC abnormality protection operation
ON OFF ON OFF
< VIHCTL
Terminal FC abnormality protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in
the transition to ON control (during soft start).
RT terminal open/short protection function RT terminal open/shot protection function off-latches all DC/DC converter controller by detecting open/short condition internally from RT terminal to prevent from output voltage error caused by abnormal oscillation of internal triangular wave at RT terminal open/short. RT terminal open/short protection function is regularly enabled after boot-up. RT terminal open/short protection function operates when error detection condition continues about more than 400sec (typ).
20 / 22
Soft start time-out function Each Ch DC/DC converter controller off-latch-controls when VSS does not exceed VSSPON from VSS > VSSSTB+VSSSTB_HYS after 50msec (typ) passed from soft start.
Figure 28 At soft start time-out Error detection (off latch) release method Each Ch DC/DC converter controller comes into off latch condition when protection function operates. Off latch can be released by the following method. Each Ch DC/DC converter controller becomes able to do ON control transition by releasing off latch. 1. Set all Ch CTL terminal voltage as < VILCTL and continue that condition about more than 200usec (typ). 2. Drop down power supply VCC to below 3.7V.
21 / 22
SSOP-B40

Tape Quantity
13.6 0.2
40 21
Embossed carrier tape 2000pcs E2
(The direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand)
7.8 0.3 5.4 0.2
Direction of feed
0.3Min.
1
20
1.8 0.1
0.15 0.1 0.1
0.1
1234
1234
1234
1234
1234
1234
1234
1234
0.65
0.22 0.1
0.08 M
Reel
1pin
Direction of feed
Unit:mm)
When you order , please order in times the amount of package quantity.
22 / 22
Catalog No.08T273A '08.8 ROHM (c)
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact your nearest sales office.
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