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© 2019 ROHM Co., Ltd.
No. 62UG012E Rev.00
1
JUN.2019
User’s Guide
Switching Regulator Series
Synchronous Buck-Boost DC/DC Converter
BD83070GWL Evaluation Board
BD83070GWL-EVK-001
Introduction
This application note will provide the steps necessary to operate and evaluate ROHM’s synchronous buck-boost DC/DC converter using
BD83070GWL evaluation board. Component selection and operating procedures are included.
Description
The BD83070GWL converter is a power supply solution designed for battery powered devices. It can operate at pulse frequency modulation
(PFM) to suppress loss and current consumption during light load which has 2.8μA quiescent current at no load. Capable to support up to 1A
output on pulse width modulation (PWM) and provides high efficiency for heavy load. It is possible to disable auto-PFM/PWM mode by via MODE
pin. User can select from 2 preset output voltage via VSEL pin and it changes between buck and boost operations depending on the relation
between input voltage and output voltage.
Application
Single Cell Li-ion or 3 Cell NiMH Battery-Powered Portable
Products
Tablet Terminal Device
Smartphone
Features
Automation PFM/PWM Mode and Fixed PWM Mode
Input Voltage Range: 2.0 V to 5.5 V
Output Current: Up To 1 A (VIN > 2.7 V, VOUT = 3.3 V)
Selectable Output Voltage: 2.5 V or 3.3 V
Efficiency: Up To 95 %
UVLO Detection: 1.61 V(Max)
Built-in Thermal, Over Voltage, And Over Current Protection
Key Specifications
Input Voltage Range: 2.0 V to 5.5 V
Output Voltage: 3.3 V or 2.5V
Output Current: 1 A
Switching Frequency: 1.5 MHz(Typ)
Quiescent VIN Current: 2.8 μA(Typ)
UCSP50L1C package (1.20 mm × 1.60 mm × 0.57 mm)
Evaluation Board Operating Limits
Parameter Symbol Limit Unit Conditions
MIN TYP MAX
Supply Voltage V
IN
2.0 - 5.5 V
Output Current I
OUT
1 - - A VIN>2.7V, VOUT=3.3V
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Evaluation Board
Material of PCB: FR-4
Number of Layer 4
PCB thickness: 1.4mm
Figure 1. BD83070GWL Evaluation Board
Board Schematic
Figure 2. BD83070GWL Evaluation Board Schematic
μ
μ
μ
6
0mm
μ
μ
μ
45mm
μ
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Output Voltage Settings
Below is a table of output voltages selectable using VSEL pin.
VSEL Pin VOUT
HIGH (≥ VIN-0.3 V) 3.3V
LOW (≤ 0.3 V) 2.5V
Table 1. Output Voltage Settings
Operation State Settings
Below is a table of BD83070GWL Condition selectable using EN pin.
EN Pin BD83070GWL Condition
HIGH (≥ 1.2 V) Enable
LOW (≤ 0.4 V) Shutdown
Table 2. EN Pin Settings
Operation Mode Settings
Below is a table of operation modes selectable using MODE pin.
MODE Pin MODE
HIGH (≥ 1.2 V) Forced PWM
LOW (≤ 0.4 V) Automatic PFM-PWM
Table 3. MODE Pin Settings
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Evaluation Board BOM
Below is a table showing the Bill of Materials. Part numbers and suppliers are included.
Reference Part Number Manufacturer
Description
[Unit: inch (mm)] Qty.
C1 GRM21BR61C106ME15 Murata 10μF, 16V, X5R, 0805 (2012) 1
C2 GRM188R60J226MEA0D Murata 22μF, 6.3V, X5R, 0603 (1608) 1
C3 CGB2A1X5R1C474M033BC
TDK 0.47μF, 16V, X5R, 0402 (1005) 1
C10, C20, C4 Open 3
L1 1239AS-H-1R5M Murata 1.5μH, 1A, 1008 (2520) 1
RFRA, R1, R2 Short 3
SW1, SW2, SW3 68000-103HLF FCI CONN HEADER VERT, .100, 3POS, 15AU
3
EN 1502-2 Keystone Electronics
TEST POINT PC MULTI PURPOSE 1
GND0, GND1, GND2,
GND3
1502-2 Keystone Electronics
TEST POINT PC MULTI PURPOSE 4
PVIN0, PVIN1 1502-2 Keystone Electronics
TEST POINT PC MULTI PURPOSE 2
VOUT0, VOUT1 1502-2 Keystone Electronics
TEST POINT PC MULTI PURPOSE 2
U1 BD83070GWL ROHM 3.3V 2A Buck-Boost DC/DC 1
Table 4: Bill of Materials
Board Operating Procedure
1. Set the output voltage using the switch settings at SW3. (refer to Table 1)
2. Set the operation mode using the switch settings at SW2. (refer to Table 3)
3. Disable the IC by setting the SW1 jumper to the upper position (EN → GND).
4. Connect the power supply’s GND terminal to one of each of the GND0,GND1,GND2,GND3 test point on the evaluation
board.
5. Connect the power supply’s VCC terminal to the PVIN0 test point on the evaluation board. This will provide VIN to the IC.
Please note that VIN should be in the range of 2.0V to 5.5V.
6. Connect the electronic load to one of each of GND0-3 and VOUT0. Connect the voltmeter to one of each of GND0-3 and
VOUT1.
7. Turn on the power supply and enable the IC by setting the jumper at SW1 to the lower position (EN → VSYS). The output
voltage can be measured at test point VOUT. Now turn on the load. The load can be increased up to 1.0A.
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Board Layout
The following are layers of the Evaluation Board of BD83070GWL
Figure 3. Top Layer
Figure 4. Middle 1 Layer
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Figure 5. Middle 2 Layer
Figure 6. Bottom Layer
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Reference Application Data
The following are graphs of efficiency, switching frequency, load response, output voltage, ripple, startup and shutdown.
Typical Performance Curves
Figure 7. Efficiency vs Output Current
(VSEL=High, MODE=Low: Auto-PFM/PWM)
Figure 8. Efficiency vs Output Current
(VSEL=High, MODE=High: Forced-PWM)
Figure 9. Efficiency vs Output Current
(VSEL=Low, MODE=Low: Auto-PFM/PWM)
Figure 10. Efficiency vs Output Current
(VSEL=Low, MODE=High: Forced-PWM)
50
55
60
65
70
75
80
85
90
95
100
0.01 0.1 1 10 100 1000
Efficiency [%]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.8 V
VIN=3.6 V
VIN=3.0 V
VIN=2.4 V
VIN=1.8 V
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
Efficiency [%]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.8 V
VIN=3.6 V
VIN=3.0 V
VIN=2.4 V
VIN=1.8 V
50
55
60
65
70
75
80
85
90
95
100
0.01 0.1 1 10 100 1000
Efficiency [%]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.8 V
VIN=3.6 V
VIN=3.0 V
VIN=2.4 V
VIN=1.8 V
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100 1000
Efficiency [%]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.8 V
VIN=3.6 V
VIN=3.0 V
VIN=2.4 V
VIN=1.8 V
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Typical Performance Curves - continued
Figure 11. Output Voltage 2 vs Output Current
(“Load Regulation”, VSEL=Low, MODE=High: Forced-PWM)
Figure 12. Output Voltage 1 vs Output Current
(“Load Regulation”, VSEL=High, MODE=High: Forced-PWM)
Figure 13. Output Voltage 2 vs Output Current
(“Load Regulation”, VSEL=Low, MODE=Low: Auto-PFM/PWM)
Figure 14. Output Voltage 1 vs Output Current
(“Load Regulation”, VSEL=High, MODE=Low: Auto-PFM/PWM)
2.10
2.15
2.20
2.25
2.30
2.35
2.40
2.45
2.50
2.55
2.60
0 500 1000 1500 2000
Output Voltage 2:V
OUT2
[V]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.6 V
VIN=2.4 V
VIN=1.8 V
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
0 500 1000 1500 2000
Output Voltage 1:V
OUT1
[V]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.6 V
VIN=2.4 V
VIN=1.8 V
2.10
2.15
2.20
2.25
2.30
2.35
2.40
2.45
2.50
2.55
2.60
0 500 1000 1500 2000
Output Voltage 2:V
OUT2
[V]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.6 V
VIN=2.4 V
VIN=1.8 V
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
0 500 1000 1500 2000
Output Voltage 1:V
OUT1
[V]
Output Current:I
OUT
[mA]
VIN=4.2 V
VIN=3.6 V
VIN=2.4 V
VIN=1.8 V
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Typical Performance Curves - continued
Figure 15. Transient Response
(VIN=2.3 V, VSEL=High, MODE=Low: Auto-PFM/PWM,
Output current 20 mA->600 mA)
Figure 16. Transient Response
(VIN=2.3 V, VSEL=High, MODE=Low: Auto-PFM/PWM,
Output current 600 mA->20 mA)
Figure 17. Transient Response
(VIN=3.6 V, VSEL=High, MODE=Low: Auto-PFM/PWM,
Output current 50 mA->1000 mA)
Figure 18. Transient Response
(VIN=3.6 V, VSEL=High, MODE=Low: Auto-PFM/PWM,
Output current 1000 mA->50 mA)
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Typical Performance Curves - continued
Figure 19. Startup Waveform
(VIN=2.4 V, VSEL=High, MODE=High: Forced-PWM,
5.5 Ω resistive load)
Figure 20. Startup Waveform
(VIN=3.6 V, VSEL=High, MODE=High: Forced-PWM,
3.3 Ω resistive load)
Figure 21. Shutdown Waveform
(VIN=3.6 V, VSEL=Low, MODE=Low: Auto-PFM/PWM, No
load)
Figure 22. Shutdown Waveform
(VIN=3.6 V, VSEL=High, MODE=Low: Auto-PFM/PWM, No
load)
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Typical Performance Curves - continued
Figure 23. Switching Frequency vs Power Supply Voltage
(MODE=High: Forced-PWM, No load)
Figure 24. Ripple Voltage vs Output Current
(VIN=3.6 V, VSEL=High)
Figure 25. Quiescent VIN Current vs Power Supply Voltage
(MODE=Low: Auto-PFM/PWM, FB=3.5V,No load)
Figure 26. Shutdown VIN current vs Power Supply Voltage
(EN=MODE=Low, No load)
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Switching Frequency:f
SW
[MHz]
Power Supply Voltage:V
IN
[V]
VSEL=Low
VSEL=High
0
20
40
60
80
100
120
140
160
180
200
0.01 0.1 1 10 100 1000
Ripple Voltage [mV]
Output Current:I
OUT
[mA]
MODE=L: Auto PFM/PWM
MODE=H: Forced PWM
0.0
0.5
1.0
1.5
2.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Shutdown VIN Current:I
SHD
[μA]
Power Supply Voltage:V
IN
[V]
Ta=-50 ˚C
Ta=+25 ˚C
Ta=+85 ˚C
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© 2019 ROHM Co., Ltd. No. 62UG012E Rev.001
JUN.2019
BD83070GWL
Revision History
Date Revision Changes
10.Jun.2019 001 New Release
R1102
B
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Before you use our Products, please contact our sales representative
and verify the latest specifica-
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Examples of application circuits, circuit constants and any other information contained herein are
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