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參數(shù)資料
| 型號(hào)： | BH33PB1WHFV |
| 元件分類： | 固定正電壓單路輸出標(biāo)準(zhǔn)穩(wěn)壓器 |
| 英文描述： | 3.3 V FIXED POSITIVE REGULATOR, PDSO5 |
| 封裝： | HVSOF-5 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 371K |
| 代理商： | BH33PB1WHFV |
Technical Note
BH
□□
PB1WHFV Series
6/9
www.rohm.com
2009 ROHM Co., Ltd. All rights reserved.
2009.04 - Rev.A
Block diagram, recommended circuit diagram, and pin assignment table
Auto Power-saving Function
Power Dissipation (Pd)
1. Power Dissipation (Pd)
Power dissipation calculations include estimates of power dissipation
characteristics and internal IC power consumption, and should be
treated as guidelines. In the event that the IC is used in an
environment where this power dissipation is exceeded, the attendant
rise in the junction temperature will trigger the thermal shutdown
circuit, reducing the current capacity and otherwise degrading the IC's
design performance. Allow for sufficient margins so that this power
dissipation is not exceeded during IC operation.
Calculating the maximum internal IC power consumption (PMAX)
2. Power Dissipation/Heat Reduction (Pd)
HVSOF5
P
MAX
= (V
IN
- V
OUT
)
I
OUT
(MAX.)
Fig. 27 HVSOF5 Power Dissipation
vs Heat Reduction (Example)
PIN No.
Symbol
Function
1
STBY
Output voltage on/off control(High: ON, Low: OFF)
2
GND
Ground
3
V
IN
Power supply input
4
V
OUT
Voltage output
5
SEL
Mode switching
(High: Fix in high-speed mode
Low: Automatic low-consumption mode switching)
The IC incorporates a built-in auto power-saving function that
continuously monitors the output current and switches
automatically between a low current consumption regulator
and a high-speed operation regulator. This function reduces
the regulator's own current consumption to approximately 1/10
or lower of normal levels when the output current falls below
approximately 300
A.
To operate only the high-speed operation regulator without
using the auto power-saving function, fix the SEL pin to high.
Fig. 26 Auto Power-Saving Function (Example)
Fig. 25
Cin … 0.47
F
Co … 0.47
F
BH
□□
PB1WHFV
THERMAL &
OVER CURRENT
PROTECTION
VOLTAGE
REFERENCE
+
-
-
+
-
-
CONTROL
BLOCK
DISCHARGE
VOUT
Co
SEL
VIN
GND
STBY
Cin
1
2
3
4
5
CURRENT
MONITOR
CH1
CH2
SOFFT
START
Rss
( )
Css
( )
Measurement conditions
BH12PB1WHFV
VCC = 2.2 V
VSEL = open,
VSTBY = 1.5 V
0
10
20
30
0
0.5
1
1.5
2
2.5
3
Output current
I
OUT
[mA]
G
I
μ
A
Low-consumption mode
High-speed mode
0
0.2
0.4
0.6
0
25
50
75
100
125
Ta[
℃
]
P
410 mW
*Circuit design
should allow a
sufficient
margin for the
temperature
range so that
P
MAX
< Pd.
V
IN
: Input voltage
V
OUT
: Output voltage
I
OUT
(MAX) : Max. output current
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