BD9007F-E2 Rohm Semiconductor, BD9007F-E2 Datasheet - Page 14

• Manufacturer Part Number: BD9007F-E2
• Description: IC REG SW 2A FLEX STEPDOWN 8-SOP
• Manufacturer: Rohm Semiconductor
• Type: Step-Down (Buck)r

Specifications of BD9007F-E2

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1 ~ 35 V
• Current - Output: 2A
• Frequency - Switching: 50kHz ~ 500kHz
• Voltage - Input: 7 ~ 35 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOP
• Power - Output: 690mW
• Output Voltage: 2. 6 V
• Output Current: 2 A
• Input Voltage: 7 V to 35 V
• Operating Temperature Range: - 40 C to + 105 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: BD9007F-E2TR

●Heat Loss
SW wave from
BD9006F, BD9006HFP, BD9007F, BD9007HFP
© 2009 ROHM Co., Ltd. All rights reserved.
www.rohm.com
GND
The chip junction temperature Tj can be considered in the following two patterns:
Output
voltage
V
For thermal design, be sure to operate the IC within the following conditions.
(Since the temperatures described hereunder are all guaranteed temperature, take margin into account.)
To obtain Tj from the IC surface temperature T
< Reference value > θj－c :HRP7
To obtain Tj from the ambient temperature Ta in actual use state,Tj=T
< Reference. value >
The heat loss W of the IC can be obtained by the formula shown below:
IN
W = Ron × Io
Load
1. The ambient temperature Ta is to be 105℃ or less.
2. The chip junction temperature Tj is to be 150℃ or less.
0
Tr
0
θj－a :
θj－a :
Ron: ON resistance of IC (refer to page.4)
Vo: Output voltage
Tr: Switching rise/fall time (approximately 20nsec)
f: Oscillation frequency
DC/DC converter
controller
2
×
HRP7 89.3℃/W Single piece of IC
54.3℃/W 2-layer PCB (Copper foil area on the front side of PCB: 15×15mm
22.7℃/W 2-layer PCB (Copper foil area on the front side of PCB: 70×70mm
PCB size: 70×70×1.6mm
Copper foil area on the front side of
SOP8 222.2℃/W Single piece of IC
181.8℃/W 1-layer PCB
PCB size: 70×70×1.6mm
2
V
Vo
IN
Maximum load
T=
+ V
SOP8 32.5℃/W
1
Adequate phase margin
Inadequate phase margin
IN
V
1
f
+
+
IN:
× Icc + Tr × V
①
②
Input voltage I
V
①
②
O
Vm
7℃/W
3
3
(PCB incorporates thermal via.)
R
L
t
IN
C
<Reference>
<Procedure>
× Io × f
in actual use state, Tj=T
CC
PCB:
: Circuit current (refer to page.3)
Measurement of open loop of the DC/DC converter
To measure the open loop of the DC/DC converter, use the gain phase
analyzer or FRA to measure the frequency characteristics.
※Please contact us if you have any questions regarding phase compensation.
Furthermore, the phase margin can also be measured with the load
responsiveness. Measure variations in the output voltage when
instantaneously changing the load from no load to the maximum load. Even
though ringing phenomenon is caused, due to low phase margin, no ringing
takes place. Phase margin is provided. However, no specific phase margin
can be probed.
10.5×10.5mm
1. Check to ensure output causes no oscillation at the maximum
2. Isolate ① and ② and insert Vm
3. Measure (probe) the oscillation of ① to that of ②.
14/17
(with amplitude of approximately.100mVpp).
load inclosed loop.
Io: Load current
2
C
+θj－c×W
a
+θj－a×W
① Ron × Io
② 2 ×
=Tr × V
2
)
1
2
IN
2
2
× Tr ×
)
× Io× f
1
T
Technical Note
× V
2009.05 - Rev.A
IN
× Io