BD9757MWV_10 Datasheet, PDF (3/24 Pages) Rohm – Switching Regulator IC

BD9757MWV
Technical Note
●Electrical characteristics (Unless specified, Ta=25℃, VCCOUT=5.0V, VBAT=3V, STB13 ~ 7=3V,UPIC8=2.5V)
Parameter
Limits
Symbol
Unit
Min.
Typ.
Max.
Conditions
【Internal regulator VREGA】
Output voltage
VREGA 2.4
2.5
2.6
V Io=5mA
【Low-voltage input malfunction prevention circuit】
Detecting voltage 1
Vstd1
-
2.0
2.3
V VREGA monitor
Hysteresis width 1
⊿Vstd1 50
100
200
mV
Detecting voltage 2
Vstd2
-
2.4
2.5
V VCCOUT monitor
Hysteresis width 2
⊿Vstd2 100
200
300
mV
【Short-circuit protection circuit】
SCP detecting time
Timer start threshold voltage
【Start circuit】
Tscp
20
25
30
msec
Vtcinv
0.38
0. 48
0.58
V
INV terminal monitor
CH3 ~ 5
Oscillating frequency
Fstart
150
300
600
kHz
Operation initiation VBAT voltage
Vst1
1.5
-
-
V
Start-up CH soft start time
Tss1
1.8
3.0
5.3 msec
【Oscillating circuit】
Oscillating frequency CH1 ~ 5
fosc1
1.0
1.2
1.4
MHz
Oscillating frequency CH6 ~ 8
fosc2
0.5
0.6
0.7
MHz
Max duty 2,3,4,5(voltage step-down)
Dmax1d
-
-
100
%
(_※2)
Max duty 1(voltage boost)
Dmax1u 86
92
96
%
Max duty 6,7,8
Dmax2
86
92
96
%
【Error AMP】
Input bias current
IINV
-
0
50
nA INV1 ~ 8, NON5=3.0V
INV threshold 1
VINV1 0.79
0.80
0.81
V CH1 ~ 5
INV threshold 2
VINV2 0.99
1.00
1.01
V CH7,8V
INV threshold 3 (max)
VINV3 370
400
430
mV CH8I
【Base Bias Voltage Vref for inverted Channel】
CH6 output voltage
VOUT6
-6.09
-6.00
-5.91
V NON6 12kΩ, 72kΩ^(※3)
Line regulation
DVLi
-
4.0
12.5
mV VCCOUT=1.5 ~ 5.5V
Output circuit at the time of short-circuit
Ios
0.2
1.0
-
mA Vref=0V
【Soft start】
CH2, 5 soft start time
Tss2, 5 3.4
4.4
5.4 msec
CH3, 4 soft start time
Tss3, 4 1.2
2.2
3.2 msec
CH6 soft start time
Tss6
3.4
4.4
5.4 msec
CH7, 8 soft start time
Tss7, 8 4.4
5.4
6.6 msec
※2 The protective circuit start working when circuit is operated by 100% duty.
So it is possible to use only for transition time shorter than charge time for SCP.
※3 Recommend resistor value over 20kΩ between VREF to NON6, because VREF current is under 100µA.
◎ This product is not designed for normal operation within a radioactive environment.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
3/20
2010.11 - Rev.A