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B340B Datasheet(PDF) 2 Page - Intersil Corporation

Part # B340B
Description  Wide VIN Negative VOUT Buck-Boost Regulator With Up to 5A Output Current
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

B340B Datasheet(HTML) 2 Page - Intersil Corporation

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Application Note 1636
2
AN1636.1
July 27, 2011
If the output voltage desired is -0.8V, then R3 is shorted. The
value for R2 is typically between 1k and 10k. Note that if
VOUT < |2.5V| (i.e., -0.8V), the switching frequency and
compensation must be changed to accommodate the 300kHz
operation, due to minimum on-time limitation. Please refer to
the ISL85033 data sheet for further information.
Frequency Control
The ISL85033-12VEVAL3Z evaluation board has an FS pin that
controls the frequency of operation. Programmable frequency
allows for optimization between efficiency and external
component size. Default switching frequency is 500kHz when FS
is tied to VCC (R9 = 0). By removing R9 and connecting R10 to
the most negative potential on the board (VOUT), the switching
frequency could be changed from 300kHz (R10 = 383k) to 2MHz
(R10 = 40.2k). See the ISL85033 data sheet for information
about calculating the value of R10. Do not leave this pin floating.
Disabling/Enabling Function
The ISL85033-12VEVAL3Z evaluation board contains an S1
switch that enables or disables both channels, thus allowing a
low quiescent current state. Table 2 details this function.
NOTE: If driven externally, the EN signal (the same as all input
logic signals) is referenced to VOUT (the most negative potential
on the board) and not to GND. Therefore, the source cannot be
GND referenced, and input level shifting is required.
FIGURE 1. ISL85033-12VEVAL3Z BUCK BOOST: RECOMMENDED
MAXIMUM IOUT (VIN)
FIGURE 2. ISL85033-12VEVAL3Z EFFICIENCY: VOUT = -15V
FIGURE 3. ISL85033-12VEVAL3Z EFFICIENCY: VOUT = -12V
FIGURE 4. ISL85033-12VEVAL3Z EFFICIENCY: VOUT = -5V
0
1
2
3
4
5
6
5
7
9
11
13
15
17
19
21
23
25
VIN (V)
VOUT = -5V
VOUT = -12V
VOUT = -15V
60
65
70
75
80
85
90
95
0
0.5
1.0
1.5
2.0
2.5
IOUT (A)
VIN = 5V
VIN = 12V
0
0.5
1.0
1.5
2.0
2.5
IOUT (A)
VIN = 12V
60
65
70
75
80
85
90
95
VIN = 15V
VIN = 5V
60
65
70
75
80
85
90
95
0
0.5
1.0
1.5
2.0
2.5
IOUT (A)
VIN = 12V
VIN = 15V
VIN = 5V
VIN = 6V
TABLE 2. SWITCH SETTINGS
S1
ON/OFF CONTROL
ON
Enable VOUT
OFF
Disable VOUT


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