Ceramate CP3800SA Switching regulator power controller Datasheet

CP3800
Switching Regulator Power Controller
Features
General Description
• Wide supply voltage operating range: 1.8 to13 V
• Low current consumption: Typically 5.5 mA
in operation, 1 µA or less in stand-by
• High speed operation is possible: Maximum
1 MHz
• The error amplifier gain is set inside the IC,
so peripheral components are minimized.
• Incorporates a soft start circuit.
• Incorporates a timer-latch type short circuit
detection circuit (SCP).
• Totem-pole type output with adjustable on/off
current (for NPN transistors)
• Incorporates a stand-by function.
The CP3800 is a single-channel switching
regulator control IC for low voltage applications
incorporating a soft start function and short circuit
detection function. The device has a low minimum
operating voltage of 1.8 V and is ideal for the
power supply of battery-operated electronic
equipment.
The CP3800 can be operated on two types: noninsulated input/output choppers (step-up, stepdown , and insulated input/output converters (flyback). The former type is used for DC/DC
converters and the latter type is used for DC/DC
converts and line-operation-type power supplies.
Applications
• Power source for battery-powered equipment
• Power source for cameras, camcorders, VCRs,
PDAs, electronic data banks, and hand-held
Communication equipment
Block Diagram
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
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CP3800
Switching Regulator Power Controller
Pin Configuration
Ordering Information
CP3800 X X
Package
N: DIP-8
S: SOP-8
T: TSSOP-8
Packing
BLANK: TUBE
A: TAPING
Pin Description
Pin No.
Symbol
I/O
1
2
3
4
5
6
7
INSCP
VCC
BR/CTL
OUT
GND
OSC
I
—
—
I
O
—
—
8
FB
O
Description
Error amplifier inverting input pin
Soft start and SCP setting capacitor connection pin
Power supply pin
Output current setting and control pin
Totem-pole type output pin
Ground pin
Capacitor and resistor connection pin for setting the oscillation
frequency
Error amplifier output pin
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
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CP3800
Switching Regulator Power Controller
Absolute Maximum Ratings
(Ta=+250C)
Parameter
Power supply voltage
Output source current
Output sink current
Allowable dissipation
Operating temperature
Storage temperature
ESD Classification
Symbol
Condition
VCC
IO+
IOPD
PD
TOP
Tstg
—
—
—
SOP-8, Ta ≦+25°C
TSSOP-8, Ta ≦+25°C
—
—
MIL-STD-883
Rated Value
Min.
Max.
—
3
—
-50
—
50
—
570
—
430
-30
+85
-55
+125
Class 2
Unit
V
mA
mA
mW
mW
0
C
0
C
* : When mounted on a 10 cm square double-sided epoxy board
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage,
current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
Recommended Operating Conditions
(Ta=+250C)
Parameter
Symbol
Values
Unit
Min.
Typ.
Max.
Power supply voltage
VCC
1.8
-12.0
V
Error amplifier input voltage
VI
-0.2
-1.0
V
BR/CTL pin input voltage
VBR
-0.2
-VCC
V
Output source current
IO+
-20
--mA
Output sink current
IO--40
mA
SCP pin capacitance
CPE
-0.1
-μF
Phase compensation capacitance
CP
-0.1
-μF
Output current setting resistance
RB
150
390
5000
Ω
Timing resistance
RT
1.0
3.0
10.0
kΩ
Timing capacitance
CT
100
270
10000
pF
Oscillation frequency
fOSC
10
500
1000
kHz
Operating temperature
TOP
-30
+25
+85
°C
WARNING: Recommended operating conditions are normal operating ranges for the semiconductor
device. All the device’s electrical characteristics are warranted when operated within these ranges.
Always use semiconductor devices within the recommended operating conditions. Operation outside
these ranges may adversely affect reliability and could result in device failure.
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
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CP3800
Switching Regulator Power Controller
Electrical Characteristics
(VCC=+2V, Ta=+250C)
Parameter
Circuit to prevent
malfunction at low
input voltage
(U.V.L.O.)
Soft start
Short circuit
detection (S.C.P.)
Sawtooth wave
oscillator (OSC)
Error amplifier
Idle period
adjustment section
Symbol
Condition
Reset voltage
VR
Threshold voltage
VTH
Charging current
Voltage at soft start
completion
Charging current
Threshold voltage
Oscillation frequency
Frequency input
Stability
Frequency variation
with temperature
Input threshold
Voltage
VT input stability
VT variation with
Temperature
Input bias current
Voltage gain
Frequency bandwidth
Maximum output
voltage range
Output source current
Output sink current
Maximum duty cycle
ICS
Vts
VSCP=0V
ICPC
VtPC
fOSC
fdV
VSCP=0V
Output voltage
Output section
--
-RT=3.3kΩ, CT=270pF
VCC=2V to 12V
fdT
Ta =-300C to 850C
VT
VFB = 450mV
VTdV
VTdT
VCC=2V to 12V
Ta = -300C to 850C
IB
AV
BW
VOM+
VOM_
IOM+
IOM_
TDUTY
VIN = 0V
VOH1
VOH2
VOL1
VOL2
Output source current
Output sink current
Pull down resistance
--
IO+
IORO
-AV = 0 dB
--
VFB = 450mV
RT=3.3kΩ, CT=270pF
fOSC = 500KHz
RB= 390Ω, IO= -15 mA
RB= 750Ω, VCC = 1.8V
IO= -10 mA
RB= 390Ω, IO= -15 mA
RB= 750Ω, VCC = 1.8V
IO= -10 mA
RB= 390Ω, VO = 0.9V
RB= 390Ω, VO = 0.3V
--
Values
Unit
Min. Typ. Max.
--0.9
V
1.1
1.3
1.5
V
-1.5
0.7
-1.0
0.8
-0.7
0.9
μA
V
-1.5
0.7
400
--
-1.0
0.8
500
2
-0.7
0.9
600
10
μA
V
kHz
%
--
5
--
%
480
500
520
mV
---
5
1
20
--
mV
%
-1.0 -0.2
70 100
-6
0.78 0.87
-- 0.05
--40
24
40
75
--
1.0 μA
145 V/V
-- MHz
-V
0.2
V
-24 μA
-- μA
85
%
1.0
0.8
1.2
1.0
---
V
V
---
0.1
0.1
0.2
0.2
V
V
-30
20
-30
60
30
-20
-40
mA
mA
kΩ
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
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CP3800
Switching Regulator Power Controller
Output current
Setting section/
Control section
Pin voltage
Input off condition
Input on condition
Pin current range
Stand-by current
VBR
IOFF
ION
IBR
ICCS
Average supply current
ICC
Entire device
0.10 0.19 0.25 V
-20
-0
μA
---45 μA
-1.8
--0.1 mA
BR/CTL pin open or --1
μA
VCC
RB= 390,VCC =2~12V
-5.5 10.0 mA
RB= 390Ω
--
Timing Chart
FB pin voltage
Reference input for short circuit
detection comparator
Idle period setting voltage
Sawtooth wave output
Soft start setting voltage
OUT pin waveforms
SCP pin waveforms
Soft start
tS
ON
Power supply control SW
OFF
Output
short
circuit
t PE
Output short circuit
Short circuit
detection
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
Http: www.ceramate.com.tw
Page 5 of 19
Rev 1.0 Mar.31,2003
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CP3800
Switching Regulator Power Controller
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
Http: www.ceramate.com.tw
Page 6 of 19
Rev 1.0 Mar.31,2003
Fax:886-3-3521052
CP3800
Switching Regulator Power Controller
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
Http: www.ceramate.com.tw
Page 7 of 19
Rev 1.0 Mar.31,2003
Fax:886-3-3521052
CP3800
Switching Regulator Power Controller
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
Http: www.ceramate.com.tw
Page 8 of 19
Rev 1.0 Mar.31,2003
Fax:886-3-3521052
CP3800
Switching Regulator Power Controller
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
Http: www.ceramate.com.tw
Page 9 of 19
Rev 1.0 Mar.31,2003
Fax:886-3-3521052
CP3800
Switching Regulator Power Controller
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
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CP3800
Switching Regulator Power Controller
Typical Application Schematic
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
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Rev 1.0 Mar.31,2003
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CP3800
Switching Regulator Power Controller
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
Http: www.ceramate.com.tw
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Rev 1.0 Mar.31,2003
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CP3800
Switching Regulator Power Controller
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
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CP3800
Switching Regulator Power Controller
Functional Description
Soft Start SCP
Figure 1 Soft-Start SCP Equivalent circuit
At power-on, the CP3800 operates in the soft-start mode. Since no current is supplied, comp1, comp2,
and SCP latch are inactive. Immediately after power-on, the CPE capacitor is charged at a constant
current of 1µA to increase from 0V. In the soft-start mode, the VSCP (capacitor CPE voltage) is input
to the PWM comparator, so that the soft-start circuit is controlled at the on-duty ratio of 0% with the
increase of the VSCP.
When the VSCP reaches 0.8V, the soft-start supplies current to comp1, comp2, and SCP latch and at
the same time discharges the CPE capacitor (VSCP=0V). This changes the soft-start mode to the
normal mode (output short circuit detection wait state) and the SCP becomes active (stays low). In the
normal mode, the input from the soft-start circuit to the PWM comparator is kept at 0.8V.
If the switching regulator output suddenly drops due to load effect, the error amplifier output (FB pin)
is fixed at VOM+ and capacitor CPE starts charging. When the voltage at the SCP pin reaches
approximately 0.8V, the output pin is set low and the SCP pin stays low.
Set time by the following expressions (see Timing Chart):
Soft-Start time (The time until the output ON duty reaches approximately 50%)
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
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CP3800
Switching Regulator Power Controller
t S = 0.35 × CPE ( µF )
Short-circuit detection time(or Soft-Start full time) :
t PE = 0.8 × CPE ( µF )
Setting Oscillating Frequency
The oscillation frequency of a sawtooth waveform is determined by the timing capacitor (CT) and the
timing resistor (RT) which are connected to the OSC pin. When the voltage of the OSC pin falls to
0.1V, the CT is rapidly charged to increase the voltage of the OSC pin instantaneously. When the
voltage of the OSC pin reaches 0.8V, Charging stops, so that CT and RT are discharged to decrease the
voltage of the OSC pin. The waveform of the OSC pin is shown as Figure 2.
Figure 2 Oscillator Waveform
The cycle (T) can be determined as follows:
VX = VHe
−
t
CT × RT
t = −CT × RT × log e (
VX
)
VH
T = −CT × RT × log e (0.1 / 0.8) = 2.1 × CT × RT [s ]
Calculating under the conditions of RT=3.0KΩ and CT=270pF , the oscillating frequency is 588kHz,
which is slightly different from the value (600kHz) in the Electrical Characteristics. This difference is
caused by characteristics, such as changes in the maximum voltage amplitude of the sawtooth
waveform with the CT value and the circuit delay causing the maximum amplitude to become large in
the case of a high oscillating frequency even for the same capacitor. It is difficult to incorporate these
non-linear characteristics into the equation. In practical use, therefore, the user should read the RT and
CT values from the characteristic curve or should determine an approximate target value by using the
equation.
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
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CP3800
Switching Regulator Power Controller
Switching Regulator Function
(1) Reference voltage circuit
The reference voltage circuit generates a temperature-compensated reference voltage (~1.25V)
from voltage supplied from the power supply pin (pin 3). In addition to providing the reference
voltage for the switching regulator, the circuit also sets the idle period.
(2) Error amplifier
The error amplifier detects the output voltage of the switching regulator and outputs the PWM
control signal. The voltage gain is fixed, and connecting a phase compensation capacitor to the
FB pin (pin 8) provides stable phase compensation for the system.
(3) PWM comparator
The voltage comparator has one inverting and three non-inverting inputs. The comparator is a
voltage/pulse width converter that controls the ON time of the output pulse depending on the
input voltage. The output level is high (H) when the sawtooth wave is lower than the error
amplifier output voltage, soft start setting voltage, and idle period setting voltage.
(4) Output circuit
The output circuit has a totem pole type configuration and can drive an external NPN transistor
directly. The value of the ON/OFF current can be set by a resistor connected to the BR/CTL pin
(pin 4). Stand-by mode (supply current 1µA or less) can be set by connecting the BR/CTL pin
(pin4) to VCC or by making the pin open circuit.
(5) Under-Voltage Lockout (UVLO)
Transients when powering on or instantaneous glitches in the supply voltage can lead to
malfunction of the control IC and cause system damage or failure. The circuit to prevent
malfunction at low input voltage detects a low input voltage by comparing the supply voltage to
the internal reference voltage. On detection, the circuit fixes the output pin to low.
To cancel the status, set VCC below the reset voltage VR (0.9V) and then set VCC up to the
recommended operation condition range. By the operation, the latch is canceled to start to operate
normally.
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
Tel:886-3-3214525
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CP3800
Switching Regulator Power Controller
Small Outline 8-pin Plastic SOP
SYMBOL
A
B
C
D
E
F
H
J
K
M
L
e1
α
INCHES
MIN
MAX
0.188
0.197
0.149
0.158
0.228
0.244
0.050
BSC
0.013
0.020
0.004
0.010
0.053
0.069
0.011
0.019
0.007
0.010
0.016
0.050
0.150 REF
450
0
80
0
MILLIMETERS
MIN
MAX
4.80
5.00
3.80
4.00
5.80
6.20
1.27 BSC
0.33
0.51
0.10
0.25
1.35
1.75
0.28
0.48
0.19
0.25
0.40
1.27
3.81 REF
450
0
0
80
NOTES
-
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: [email protected]
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CP3800
Switching Regulator Power Controller
Small Outline 8-pin TSSOP
SYMBOL
A
B
C
D
E
F
H
K
M
α
INCHES
MIN
MAX
0.114
0.122
0.169
0.177
0.244
0.260
0.026
BSC
0.010
0.012
0.002
0.006
0.041
0.047
0.005
BSC
0.020
0.028
80
00
MILLIMETERS
MIN
MAX
2.90
3.10
4.30
4.50
6.20
6.60
0.65 BSC
0.25
0.30
0.05
0.15
1.05
1.20
0.127 BSC
0.50
0.70
00
80
NOTES
-
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
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CP3800
Switching Regulator Power Controller
Reflow Condition (IR/Convection or VPR Reflow)
Reference JEDEC Standard J-STD-020A
Classification Reflow Profiles
Convection or
IR/Convction
Average Heating Rate(180°C to peak)
Preheat Temperature(125±20°C)
Temperature maintained above 180°C
Time within 5°C of actual Peak Temperature
Peak Temperature Range(Note 1)
Cooling Rate
Time 25°C to Peak Temperature
5°C/second max.
120 seconds max.
10~150 seconds
10~20 seconds
219~225°C or
235~240°C
6°C /second max.
6 minutes max.
VPR
10°C/second max.
60 seconds
219~225°C or
235~240°C
10°C/second max.
*1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions.
Package Reflow Conditions
Pkg. Thickness ≥2.5mm Pkg. Thickness <2.5mm Pkg. Thickness <2.5mm
and
and
and all bags
3
Pkg. Volume ≥350 mm
Pkg. Volume <350 mm3
Convection 219~225°C
VPR 219~225°C
IR/Convection 219~225°C
Convection 235~240°C
VPR 235~240°C
IR/Convection 235~240°C
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
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