Component - Boost Converter (BoostConv) V2.0 Datasheet.pdf

®
PSoC Creator™ Component Datasheet
Boost Converter (BoostConv)
2.0
Features
 Produces a selectable output voltage that is higher than the input voltage
 Input voltage range between 0.5 V and 5.5 V
 Boosted output voltage range between 1.8 V and 5.25 V
 Source up to 50 mA depending on the selected input and output voltage parameter values
 Two modes of operation: Active and Standby
 Boost standby mode operation with autothump is not supported on PSoC 3 ES2. Only Boost
active mode operation is supported on this device.

Boost Converter component is not supported on PSoC 5.
General Description
The Boost Converter (BoostConv) component allows you to configure and control the PSoC
boost converter hardware block. The boost converter enables input voltages that are lower than
the desired system voltage to be boosted to the desired system voltage level. The converter
uses an external inductor to convert the input voltage to the desired output voltage.
The BoostConv component is enabled by default at chip startup with an output voltage of 1.8 V.
This allows the chip to start up in scenarios where the input voltage to the boost is below the
minimum allowable voltage to power the chip. The configuration parameters defined in the
component customizer (default VIN = 1.8 V, VOUT = 3.3 V, Switching Frequency = 400 kHz) will
not take effect until the BoostConv_Start() API is called. The BoostConv component parameters
can also be adjusted during run time using the provided APIs.
The boost converter has two main operating modes:

Active – Active mode is the normal mode of operation where the boost regulator actively
generates a regulated output voltage.

Standby – Standby mode is a low-power mode of operation.
When to Use the Boost Component
Use the BoostConv component when the available voltage source for a system is less than the
required voltage level to operate the system. The BoostConv component accepts a battery or
other input voltage and produces a higher output voltage
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-69085 Rev. *A
Revised October 12, 2011
Boost Converter (BoostConv)
®
PSoC Creator™ Component Datasheet
As an example, the system may use a 0.5-V solar cell as the primary power source and rely on
the boost block to power the 1.8-V PSoC core. In another application, a 3.3-V system could use
the BoostConv component to power a 5.0-V LCD glass.
Input/Output Connections
The BoostConv component requires no connections in the project schematic view. Fixedfunction pins support the boost converter block circuit. The system circuit must provide
connections for the input voltage (Vbat), output voltage (Vout), inductor pin (Ind), and battery
ground (Vssb). Refer to the schematic representation shown in the Functional Description
section.
Component Parameters
Drag a BoostConv component onto your design and double-click it to open the Configure dialog.
Vbat input voltage (V)
This is the VBAT or other voltage source that is used as the input voltage to the boost converter
block. This system circuit connects this voltage to the Vbat PSoC pin. The input voltage can be
between 0.5 V and 5.5 V. This value is used to calculate the estimated maximum output current.
The default value is 1.8 V.
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Document Number: 001-69085 Rev. *A
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PSoC Creator™ Component Datasheet
Boost Converter (BoostConv)
Output voltage (V)
This is the target output voltage that the boost converter block will maintain. Use the drop-down
list to select the desired output voltage. Output voltage levels are provided in 0.1-V increments
from 1.8 V to 3.6 V and in 0.25-V increments from 4.00 V to 5.25 V. The default value is 3.3 V.
An external Schottky diode is required for output voltages above 3.6 V.
The output voltage value can be modified at run time by using the BoostConv_SelVoltage()
function.
Switching frequency
This is the switching frequency at which the boost converter block will operate. This value is an
enumerated type and can be set to any of the following frequencies:




100 kHz
400 kHz
2 MHz
External 32 kHz
The 100-kHz, 400-kHz, and 2-MHz switching frequencies are generated using an oscillator
internal to the boost converter block. The External 32-kHz switching frequency is intended for
Standby mode automatic thump regulation.
External clock source
The External 32 kHz to the Boost frequency is the source of the switching signal when the boost
converter block is configured to use an external clock. This value can be set to any of the
following frequencies:



None
ECO 32kHz
ILO 32kHz
Note The external 32-kHz clock (ECO or ILO) selection is only supported in PSoC 3 Production
silicon. Select None for PSoC 3 ES2 silicon.
Max output current (mA)
This is an estimate of the maximum output current available from the boost converter block
based on the specified Vbat input voltage and Output voltage values. This is a read-only
value.
Document Number: 001-69085 Rev. *A
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Boost Converter (BoostConv)
PSoC Creator™ Component Datasheet
Disable auto battery connect to output when Vin = Vsel
When set, disables auto battery connection to output when Vin = Vsel. For more details, see
Functional Description.
Placement
The BoostConv component uses the dedicated boost converter hardware block in the silicon. No
placement options are available.
Resources
Digital Blocks
Resolution
Datapaths
Macro
cells
BoostConv fixed
HW *
N/A
N/A
API Memory (Bytes)
Status
Control
Registers Registers Counter7
N/A
N/A
Flash
RAM
Pins (per
External
I/O)
494
3
N/A
N/A
* The BoostConv component uses the dedicated boost converter hardware block in the silicon.
Application Programming Interface
Application Programming Interface (API) routines allow you to configure the component using
software. The following table lists and describes the interface to each function. The subsequent
sections cover each function in more detail.
By default, PSoC Creator assigns the instance name “BoostConv_1” to the first instance of a
component in a given design. You can rename it to any unique value that follows the syntactic
rules for identifiers. The instance name becomes the prefix of every global function name,
variable, and constant symbol. For readability, the instance name used in the following table is
“BoostConv.”
Function
Description
BoostConv_Start()
Starts the BoostConv component and puts the boost block into Active mode.
BoostConv_Stop()
Disables the BoostConv component. Turns off power to the boost converter
circuitry.
BoostConv_EnableInt()
Enables the boost block undervoltage interrupt generation.
BoostConv_DisableInt()
Disables the boost block undervoltage interrupt generation.
BoostConv_SetMode()
Sets the boost converter mode to Active or Standby.
BoostConv_SelVoltage()
Selects the target output voltage the boost converter will maintain.
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Document Number: 001-69085 Rev. *A
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PSoC Creator™ Component Datasheet
Boost Converter (BoostConv)
Function
Description
BoostConv_SelFreq()
Sets the switching frequency to one of four possible values: 100 kHz,
400 kHz, and 2 MHz (generated internal to the boost converter block) or
32 kHz (sourced external to the boost converter block from the chip
ECO-32kHz or ILO-32kHz oscillator).
BoostConv_EnableAutoThump()
Enables automatic thump mode (only available when the boost block is in
Standby mode and the switching frequency is set to 32 kHz).
BoostConv_DisableAutoThump()
Disables automatic thump mode.
BoostConv_ManualThump()
Forces a single pulse of the boost converter switch transistors.
BoostConv_ReadStatus()
Returns the boost block status register.
BoostConv_SelExtClk()
Sets the source of 32-kHz frequency: the 32-kHz ECO or 32-kHz ILO.
BoostConv_ReadIntStatus()
Returns the contents of the boost block interrupt status register.
BoostConv_Init()
Initializes BoostConv registers with initial values provided from customizer.
BoostConv_Enable()
This function enables the boost block (only valid when in Active mode).
Component is enabled by default.
BoostConv_Disable()
Disables the boost block.
Global Variables
Function
BoostConv_initVar
Description
Indicates whether the Boost Converter has been initialized. The variable is initialized to 0
and set to 1 the first time BoostConv_Start() is called. This allows the component to restart
without reinitialization after the first call to the BoostConv_Start() routine.
If reinitialization of the component is required, then the BoostConv_Init() function can be
called before the BoostConv_Start() or BoostConv_Enable() function.
void BoostConv_Start(void)
Description:
Starts the BoostConv component and puts the boost block into Active mode. The component
is in this state when the chip powers up. This is the preferred method to begin component
operation. BoostConv_Start() sets the initVar variable, calls the BoostConv_Init() function,
and then calls the BoostConv_Enable() function.
Parameters:
None
Return Value: None
Side Effects:
If the initVar variable is already set, this function: (1) Sets the initial value of the target output
voltage (from the customizer) and mode (Active mode) or restores target output voltage and
mode saved in the BoostConv_Stop() function; (2) Calls the BoostConv_Enable() function.
Document Number: 001-69085 Rev. *A
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Boost Converter (BoostConv)
PSoC Creator™ Component Datasheet
void BoostConv_Stop(void)
Description:
Saves boost converter target output voltage and mode. Disables the BoostConv component.
Parameters:
None
Return Value: None
Side Effects:
Turns off power to the boost converter circuitry. Sets the boost converter to Standby mode.
void BoostConv_EnableInt(void)
Description:
This function enables the boost block output undervoltage interrupt generation.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_DisableInt(void)
Description:
This function disables the boost block output undervoltage interrupt generation.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_SetMode(uint8 mode)
Description:
This function sets the boost converter mode: Active or Standby.
Parameters:
uint8 mode: Sets the operational mode for the boost block:
Mode
BoostConv_BOOSTMODE_ ACTIVE
Notes
In the active mode, the boost block maintains the
selected output voltage.
BoostConv_BOOSTMODE_STANDBY Low power state, only bandgap and comparator
circuitry is active. Automatic thump mode is used
with the external 32-kHz clock to regulate output
voltage
Return Value:
None
Side Effects:
For Standby mode, this function enables automatic thump mode and sets the switching
frequency clock source to the 32-kHz external clock. For Active mode this function disables
automatic thump mode.
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PSoC Creator™ Component Datasheet
Boost Converter (BoostConv)
void BoostConv_SelVoltage(uint8 voltage)
Description:
This function selects the target output voltage the boost converter will maintain.
Parameters:
uint8 voltage: The target output voltage for the boost converter block. Output voltages above
3.6 V require an external Schottky diode
Power Setting
Value
Notes
BoostConv_VOUT_OFF
0x00
Off – HI-Z
BoostConv_VOUT_1_8V
0x03
1.8 V
BoostConv_VOUT_1_9V
0x04
1.9 V
BoostConv_VOUT_2_0V
0x05
2.0 V
BoostConv_VOUT_2_1V
0x06
2.1 V
BoostConv_VOUT_2_2V
0x07
2.2 V
BoostConv_VOUT_2_3V
0x08
2.3 V
BoostConv_VOUT_2_4V
0x09
2.4 V
BoostConv_VOUT_2_5V
0x0A
2.5 V
BoostConv_VOUT_2_6V
0x0B
2.6 V
BoostConv_VOUT_2_7V
0x0C
2.7 V
BoostConv_VOUT_2_8V
0x0D
2.8 V
BoostConv_VOUT_2_9V
0x0E
2.9 V
BoostConv_VOUT_3_0V
0x0F
3.0 V
BoostConv_VOUT_3_1V
0x10
3.1 V
BoostConv_VOUT_3_2V
0x11
3.2 V
BoostConv_VOUT_3_3V
0x12
3.3 V
BoostConv_VOUT_3_4V
0x13
3.4 V
BoostConv_VOUT_3_5V
0x14
3.5 V
BoostConv_VOUT_3_6V
0x15
3.6 V
BoostConv_VOUT_4_0V
0x16
4.00 V
(external Schottky diode required)
BoostConv_VOUT_4_25V
0x17
4.25 V
(external Schottky diode required)
BoostConv_VOUT_4_5V
0x18
4.50 V
(external Schottky diode required)
BoostConv_VOUT_4_75V
0x19
4.75 V
(external Schottky diode required)
BoostConv_VOUT_5_0V
0x1A
5.00 V
(external Schottky diode required)
BoostConv_VOUT_5_25V
0x1B
5.25 V
(external Schottky diode required)
Return Value:
None
Side Effects:
None
Document Number: 001-69085 Rev. *A
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Boost Converter (BoostConv)
PSoC Creator™ Component Datasheet
void BoostConv_SelFreq(uint8 frequency)
Description:
This function sets the switching frequency to one of four possible values
Parameters:
uint8 switch_freq: The desired switching frequency
Switch Frequency
Notes
BoostConv__SWITCH_FREQ_100KHZ Generated internal to the boost converter block
with a dedicated oscillator
BoostConv__SWITCH_FREQ_400KHZ
BoostConv__SWITCH_FREQ_2MHZ
BoostConv__SWITCH_FREQ_32KHZ
Comes from the ECO-32kHz or ILO-32kHz
Return Value: None
Side Effects:
None
void BoostConv_EnableAutoThump(void)
Description:
This function enables automatic thump mode. The AutoThump mode is available only when
the boost block is in the Standby mode. The switching frequency clock source for the boost
block must be set to the 32-kHz external clock. In this mode, standby boost operation is
accomplished by generating a boost switch pulse on each edge of the switching clock when
the output voltage is below the selected value.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_DisableAutoThump(void)
Description:
This function disables automatic thump mode.
Parameters:
None
Return Value: None
Side Effects:
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None
Document Number: 001-69085 Rev. *A
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PSoC Creator™ Component Datasheet
Boost Converter (BoostConv)
void BoostConv_ManualThump(void)
Description:
This function forces a single pulse of the boost converter switch transistors.
Parameters:
None
Return Value: None
Theory:
Side Effects:
Thump produces one ~500-ns pulse when set. This routine writes a ‘0’ followed by a ‘1’ to
the bit 7 “thump” bit in the boost block BOOST_CR0 register.
uint8 BoostConv_ReadStatus(void)
Description:
This function returns the contents of the boost block status register
Parameters:
None
Return
Value:
uint8 boost block status register: BOOST_SR:
Side Effects:
Bit
Name
Description
7
BoostConv_RDY
When set, internal circuits have been initialized
6
BoostConv_START
When set, converter is in startup mode
5
–
Reserved
4
BoostConv_OV
Output above overvoltage limit when 1, below limit when 0
3
BoostConv_VHI
Output is above vhigh limit when 1, below limit when 0
2
BoostConv_VNOM
Output is above nominal when 1, below nominal when 0
1
BoostConv_VLO
Output is above vlow limit when 1, below limit when 0
0
BoostConv_UV
Output is above undervoltage limit when 1, below limit when 0
None
void BoostConv_SelExtClk(uint8 source)
Description:
This function sets the source of 32-kHz frequency: the chip’s ECO-32kHz or ILO-32kHz.
Parameters:
uint8 source: The source of 32-kHz frequency
Name
Description
BoostConv__EXTCLK_ECO
Set chip ECO-32kHz as the source of 32-kHz frequency
BoostConv__EXTCLK_ILO
Set chip ILO-32kHz as the source of 32-kHz frequency
Return Value: None
Side Effects:
None
Document Number: 001-69085 Rev. *A
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Boost Converter (BoostConv)
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PSoC Creator™ Component Datasheet
void BoostConv_ReadIntStatus(void)
Description:
This function returns the contents of the boost block interrupt status register.
Parameters:
None
Return Value: uint8 Boost interrupt status register BOOST_SR2 bit 0: When set, a Boost Output
Undervoltage event has occurred.
Side Effects:
None
void BoostConv_Init(void)
Description:
Initializes or restores the component according to the customizer Configure dialog settings. It
is not necessary to call BoostConv_Init() because the BoostConv_Start() API calls this
function and is the preferred method to begin component operation.
Parameters:
None
Return Value: None
Side Effects:
All registers will be set to values according to the customizer Configure dialog.
void BoostConv_Enable(void)
Description:
This function enables the boost block when in Active mode. The component is enabled by
default. Activates the hardware and begins component operation. It is not necessary to call
BoostConv_Enable() because the BoostConv_Start() API calls this function, which is the
preferred method to begin component operation.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_Disable(void)
Description:
This function disables the boost block.
Parameters:
None
Return Value: None
Side Effects:
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None
Document Number: 001-69085 Rev. *A
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PSoC Creator™ Component Datasheet
Boost Converter (BoostConv)
Sample Firmware Source Code
PSoC Creator provides many example projects that include schematics and example code in the
Find Example Project dialog. For component-specific examples, open the dialog from the
Component Catalog or an instance of the component in a schematic. For general examples,
open the dialog from the Start Page or File menu. As needed, use the Filter Options in the
dialog to narrow the list of projects available to select.
Refer to the “Find Example Project” topic in the PSoC Creator Help for more information.
Functional Description
Figure 1. Application for Boost Converter
Vboost
Vdda
Vddd Vdddio
External
Schottky diode
required when
Vput > 3.6 V
Ind
10–22 µH
22 µF
PSoC
0.1 µF
Vbat
22 µF
Vssb
Vssa
Vssd
The boost block circuit is enabled by default to support scenarios in which processor startup is
powered by the VBOOST voltage. The boost block is configured for Active mode with an output
voltage of 1.8 V by default. When a BoostConv component is placed in a project, it provides
access to the configuration registers for the boost hardware block. The BoostConv_Start()
function configures the BoostConv component with the settings made in the component
configuration dialog.
Document Number: 001-69085 Rev. *A
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Boost Converter (BoostConv)
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PSoC Creator™ Component Datasheet
Boost block registers are powered from the VBOOST supply. The VBOOST output cannot be allowed
to fall below 1.4 V. You can expect to lose register contents if V BOOST is allowed to fall below
1.4 V. The firmware must reload these registers if such these conditions occur.
The boost converter hardware uses the fixed-function pins on the chip shown in the schematic
above. These signals are not shown on the BoostConv component.
Operation with Input Voltage Greater Than Programmed Output Voltage
When Control register 2 (BOOST_CR2): Bit 1 (eqoff) = 0, the output voltage will track the input
voltage when the input is greater than the programmed output voltage. This is shown below:


Output Voltage = Programmed voltage when Input < Programmed
Output Voltage = Input voltage when Input > Programmed
When Control register 2 (BOOST_CR2): Bit 1 (eqoff) = 1, the output voltage does not track until
either the optional external Schottky diode or inherent internal silicon diode between the inductor
pin and output are forward biased. The effect of this is that the output voltage tracks input with a
diode drop, as shown below:


Output Voltage = Programmed voltage when Input < Programmed
Output Voltage = Input voltage – diode drop when Input > Programmed + diode drop
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Document Number: 001-69085 Rev. *A
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PSoC Creator™ Component Datasheet
Boost Converter (BoostConv)
DC and AC Electrical Characteristics
The following values indicate expected performance and are based on initial characterization
data. Unless otherwise specified in the tables below, operating conditions are: V BAT = 2.4 V,
VOUT = 2.7 V, IOUT = 40 mA, FSW = 400 kHz, LBOOST = 10 µH, CBOOST = 22 µF || 0.1 µF
Inductive Boost Regulator DC Specifications
Parameter
VBAT
IOUT
Description
Min
Typ
Max
Units
T = –35 °C to +65 °C
0.5
–
3.6
V
Over entire temperature range
0.68
–
3.6
V
VBAT = 1.6–3.6 V, VOUT = 3.6–5.0 V,
external diode
–
–
50
mA
VBAT = 1.6–3.6 V, VOUT = 1.6–3.6 V,
internal diode
–
–
75
mA
VBAT = 0.8–1.6 V, VOUT = 1.6–3.6 V,
internal diode
–
–
30
mA
VBAT = 0.8–1.6 V, VOUT = 3.6–5.0 V,
external diode
–
–
20
mA
VBAT = 0.5–0.8 V, VOUT = 1.6–3.6 V,
internal diode
–
–
15
mA
–
–
700
mA
Boost active mode
–
200
–
µA
Boost standby mode, 32-kHz external
crystal oscillator, IOUT < 1 µA
–
12
–
µA
1.8 V
1.71
1.80
1.89
V
1.9 V
1.81
1.90
2.00
V
2.0 V
1.90
2.00
2.10
V
2.4 V
2.28
2.40
2.52
V
2.7 V
2.57
2.70
2.84
V
Input voltage
includes startup
Load current
1, 2
ILPK
Inductor peak current
IQ
Quiescent current
VOUT
Conditions
Boost output voltage range
3, 4
1
For output voltages above 3.6 V, an external diode is required.
2
Maximum output current applies for output voltages £ 4x input voltage.
3
Based on device characterization (Not production tested).
4
At boost frequency of 2 MHz, VBOOST is limited to 2 × VBAT. At 400 kHz, VBOOST is limited to 4 × VBAT.
Document Number: 001-69085 Rev. *A
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Boost Converter (BoostConv)
Parameter
PSoC Creator™ Component Datasheet
Description
Min
Typ
Max
Units
3.0 V
2.85
3.00
3.15
V
3.3 V
3.14
3.30
3.47
V
3.6 V
3.42
3.60
3.78
V
4.75
5.00
5.25
V
5.0 V
Conditions
External diode required
RegLOAD
Load regulation
–
–
3.8
%
RegLINE
Line regulation
–
–
4.1
%

Efficiency
LBOOST = 10 µH
70
85
–
%
LBOOST = 22 µH
82
90
–
%
Min
Typ
Max
Units
–
–
100
mV
–
0.1,
0.4, or
2
–
MHz
Inductive Boost Regulator AC Specifications
Parameter
Description
VRIPPLE
Ripple voltage
(peak-to-peak)
FSW
Switching frequency
Conditions
VOUT = 1.8 V, FSW = 400 kHz,
IOUT = 10 mA
Component Changes
This section lists the major changes in the component from the previous version.
Version
Description of Changes
Reason for Changes / Impact
2.0.a
Datasheet corrections
2.0
Removed reference to PSoC 5 support.
Component is not supported by PSoC 5.
Updated BoostConv_Start() and BoostConv_Stop()
functions with set/restore mode and voltage
An expected use case is using Boost to power
off-chip devices, so firmware is expected to
start/stop the boost.
Added new parameter “Disable auto battery connect
to output when Vin = Vsel.” Updated BoostConv_Init()
function with disabling auto battery connect to output
when VIN = VSEL.
To allow the user to configure whether the output
voltage should track the input voltage when VBAT
> VBOOST, or only track after the diode is forward
biased (so the output tracks the input - diode
drop).
Added autothump support note to Features in
datasheet
Silicon bug in PSoC 3 ES2 and PSoC 5
Added information to the component that advertizes
its compatibility with silicon revisions.
The tool reports an error/warning if the
component is used on incompatible silicon. If this
happens, update to a revision that supports your
target device.
1.50.a
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Document Number: 001-69085 Rev. *A
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PSoC Creator™ Component Datasheet
Version
Description of Changes
Boost Converter (BoostConv)
Reason for Changes / Impact
Added characterization data to datasheet
Removed reference to sleep mode from datasheet
Component doesn’t support sleep mode.
Minor datasheet edits and updates
1.50
Added support of PSoC 3 Production silicon. Three
API functions have been added:
Boost Converter supports generation of
undervoltage signal.
void BoostConv_EnableInt(void);
void BoostConv_DisableInt(void);
uint8 BoostConv_ReadIntStatus(void);
API function has been added:
void BoostConv_SelExtClk(uint8);
Added BoostConv_Init() function.
To support selection of external switching clock
sources of Boost Converter: ILO or ECO.
To comply with corporate standard and provide
an API to initialize/restore the component without
starting it.
© Cypress Semiconductor Corporation, 2011. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of
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Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in lifesupport systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application
implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Use may be limited by and subject to the applicable Cypress software license agreement.
Document Number: 001-69085 Rev. *A
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