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CALIFORNIA MICRO DEVICES
CMPWR160
USB Peripheral Power Management
Features
* 3.3V regulated output up to 500mA * Quiescent current 35A (typical) * Shutdown mode current 7A (typical) * 30ms active LOW Power-On Reset (POR) pulse * Thermal overload protection * Foldback current limiting protection * Reverse-current protection * 8 pin SOIC power package
Applications
* Bus-powered USB peripherals * Self-powered USB peripherals * Portable/battery-powered devices * Critical power monitoring, hot-insertion devices
The SmartORTM CMPWR160 combines a Low Dropout Regulator (LDO) with a Power-On Reset (POR) pulse generator, and is intended for Universal Serial Bus (USB) peripherals. To meet the specification requirements of both USB 1.0 and USB 2.0, the CMPWR160 draws a very low quiescent current (35A), and delivers up to 500mA of load current at a fixed 3.3V output. The POR pulse (active LOW) has a typical duration of 30ms after the output has exceeded and stabilized above 2.9V. Thus a new POR pulse is developed each time the regulator power is interrupted and restored, which occurs often on USB buses when cables are connected (or disconnected) by the user. It is not necessary to have a VCC supply for POR to operate, allowing the CMPWR160 to work in Wired-ORed power systems.
When VCC is powered down, the device will automatically enter reverse-current protection mode and maintain isolation between VOUT and VCC. This is useful for applications that can use power from the USB port in addition to internal batteries or an AC adapter supply (Wired-ORed power systems). In the event of VCC collapsing below VOUT, the device will automatically enter shutdown mode and fully isolate the VCC power source from the output. A ShutDown input (SD) forces the regulator to be powered down on demand. While in shutdown mode the POR circuitry will remain active, making the device suitable for systems which contain backup or alternative power sources. The CMPWR160 is available in an 8-pin SOIC thermally enhanced package, ideal for applications where space is tight.
Block Diagram
Top View VCC SD POR VOUT 1 2 3 4 8 7 6 5 GND GND GND GND
GND VREF 3.3V VCC SD
+ -
SD
VOUT 3.3V/500mA
+
30ms
CMPWR160 8 LEAD SOIC
POR
-
Pin Diagram
2.9V
Simplified Electrical Schematic
Standard Part Ordering Information
Package Pin 8 Style Power SOIC Tubes CMPWR160SA/T Ordering Part Number Tape & Reel CMPWR160SA/R Part Marking CMPWR160SA
C1571000
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
Absolute Maximum Ratings
Parameter ESD Protection (HBM) V CC /V OUT Voltage SD Logic Input Voltage POR Logic Output Voltage Temperature: Storage Operating Ambient Operating Junction Power Dissipation Note 1 Rating 2000 6.0, GND -0.5 V CC + 0.5, GND -0.5 V OUT + 0.5, GND -0.5 -40 to 150 0 to 70 0 to 125 Internally Limited Unit V V V V
CMPWR160
C
Operating Conditions
Parameter VCC Temperature (Ambient) Load Current CEXT Range 4.2 to 5.5 0 to 70 0 to 500 10 10% Unit V
C
mA F
Electrical Operating Characteristics
(over operating conditions unless specified otherwise) Symbol VOUT ILIM IS/C VR LOAD VR LINE VDO IQ ISD IRCC VIH SD VIL SD VPOR TPOR RPOR TDISABLE THYST Parameter Regulator Output Voltage Regulator Current Limit Short-Circuit Current Limit Load Regulation Line Regulation Regulator Dropout Voltage Quiescent Supply Current Shutdown Supply Current VCC Pin Reverse Leakage Shutdown High Detect Shutdown Low Detect POR Detect Threshold POR Pulse Duration POR Output Impedance Shutdown Temperature Thermal Hysteresis After POR Threshold Detected Sinking to GND/Sourcing from VCC VCC = 5V, ILOAD = 5mA to 500mA VCC = 4.2V to 5.5V, ILOAD = 5mA MIN VCC - VOUT for ILOAD = 500mA Regulator Enabled (No Load) Regulator Disabled VOUT = 3.3V, VCC = 0V VCC = 5V VCC = 5V 4.2V < VCC < 5.5V 2.8 20 0.2 Conditions 0mA < ILOAD < 500mA MIN 3.135 550 300 75 2 0.6 35 7 1 3.0 1.0 2.9 30 0.5 160 20 3.0 40 2 0.9 50 10 10 TYP 3.30 MAX 3.465 UNIT V mA mA mV mV V A A A V V V ms k
C C
Note 1: The SOIC package used is thermally enhanced through the use of a fused integral leadframe. The power rating is based on a printed circuit board heat spreading capability equivalent to 2 square inches of copper connected to the GND pins. Typical multi-layer boards using power plane construction will provide this heat spreading ability without the need for additional dedicated copper area. (Please consult with factory for thermal evaluation assistance.)
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
2
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
12/5/2000
CALIFORNIA MICRO DEVICES
Interface Signals
VCC is the input power source for the Low Drop Out Regulator, capable of delivering 3.3V/500mA output current even when the input is as low as 4.2V. Internal loading on this pin is typically 35A when the regulator is enabled, which reduces to only 7A whenever the regulator is shutdown (SD taken Low). In the event of VCC collapsing below VOUT, the loading at VCC will immediately reduce to less than 0.1A. If the VCC pin is within a few inches of the main input filter, a capacitor may not be necessary. Otherwise an input filter capacitor in the range of 1F to 10F will ensure adequate filtering.
SD is the regulator shutdown input logic signal which is Active Low. This is a true CMOS input signal referenced to VCC supply. When the pin is tied High (VCC ) the regulator operates fully. When the pin is taken to GND, the device enters shutdown mode and the regulator is fully disabled. In this mode all critical POR circuitry remains fully powered consuming less than 7A (typical).
CMPWR160
ately enters reverse protection mode to prevent any current flow back into the regulator pass transistor. Under these conditions VOUT will also be used to provide the necessary quiescent current for the internal reference and POR circuits. This ensures excellent start-up characteristics for the regulator.
POR is the Power-On-Reset output pin (Active Low).
When VOUT rises above the POR threshold voltage (typically 2.9V), the pin is forced to logic low (GND). The pin remains logic low for 30ms then it is forced logic high (3.3V). If VOUT falls below the POR threshold voltage during this 30ms interval POR will remain logic low. If it falls below the voltage threshold and then recovers the 30ms time will reset. If VOUT falls below the POR threshold voltage POR is immediately forced to logic low. The power-on reset circuitry is designed to remain active under all conditions and will produce a valid output even when VCC is not present. A very low quiescent current (7A typical) ensures continuous operation of the POR circuit. GND is the negative reference for all voltages. This current that flows in the ground connection is very low (35A typical with the regulator enabled and 7A typical with the regulator disabled).
VOUT is the regulator output voltage used to power the load. An output capacitor of 10F is used to provide the necessary phase compensation, thereby preventing oscillation. The capacitor also helps to minimize the peak output disturbance during line or load transients. Whenever VCC collapses below the output the device immedi-
Pin Functions
Symbol VCC SD POR VOUT GND Description Positive supply input for regulator. When VCC falls below VOUT the regulator is disabled. Shutdown control input signal (Active Low) to disable internal voltage regulator and current supply to less than 7A. Power-On-Reset output signal is held Low until the output has been stable (>2.9V) for at least 30ms. Regulator voltage ouput (3.3V) capable of delivering 500mA when device is enabled (SD is High). Whenever the output exceeds 2.9V (TYP) the POR pulse is triggered. Negative reference for all voltages
CMPWR160 VCC
+
POR VOUT GND
uP Reset VOUT 3.3V/500mA
+
VCC
5V + -
CIN 1F
SD
COUT 10F
GND
Typical Application Circuit
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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CALIFORNIA MICRO DEVICES
Typical DC Characteristics
Unless stated otherwise, all DC characteristics were measured at room temperature with a nominal VCC supply voltage of 5V and an output capacitance of 10F. Resistive load conditions were used. Line Regulation Characteristics of the regulator are shown in Figure 1. At maximum rated load conditions (500mA), a 100mV drop in regulation occurs when the line voltage has collapses below 3.8V. For light load conditions (5mA), regulation is maintained for line voltages as low as 3.3V.
3.35 3.30 3.25
VOUT (V)
CMPWR160
5mA Load 500mA Load
3.20 3.15 3.10 3.05 3.0
3.5
4.0 VCC (V)
4.5
5.0
Figure 1. Line Regulation
VOUT (V)
Load Regulation performance is shown from zero to maximum rated load in Figure 2. A 10% to 100% change of rated load, results in an output voltage change of less than 10mV. This translates into an effective output impedance of approximately 0.02.
3.40
3.35
3.30
3.25
3.20
0
200
400
600
Load Current (mA)
Figure 2. Load Regulation
Ground Current (A)
Ground Current is shown across the entire range of load conditions in Figure 3. The ground current increases by 40A across the range of load conditions. This increase is due to the current limiting protective circuitry becoming active.
100 80 60 40 20 0 0 200 400 600 Load Current (mA)
Figure 3. Ground Current
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
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Tel: (408) 263-3214
Fax: (408) 263-7846
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CALIFORNIA MICRO DEVICES
Typical DC Characteristics continued
VCC Operating Current (no load, SD high) is shown across a range of VCC supply voltages with the regulator enabled in Figure 4. The graph shows that the operating current is 35A typical and changes by less than 1A across this range.
60 50 Supply Current (A) 40 30 20 10 0 3.5
CMPWR160
4.5 VCC (V)
5.5
Figure 4. VCC Operating Current (no load)
VCC Shutdown Current variation with the VCC supply voltage is shown in Figure 5.
Supply Current (A)
10 8 6 4 2 0 1.5
2.5
3.5 VCC (V)
4.5
5.5
Figure 5. VCC Shutdown Current
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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CALIFORNIA MICRO DEVICES
Typical Transient Characteristics
The transient characterization test setup is shown in Figure 6. It was the setup used for the transient tests unless specified otherwise. A maximum rated load current of 6.6 (500mA @ 3.3V) was used during characterization along with a nominal VCC supply voltage of 5V DC, unless specified otherwise. The load transient characterization was done by switching between 6.6 and 660 load resistors. This switched the load between 500 and 5mA respectively. For the VCC power-up and power-down characterizations VCC supply was ramped between 0 and 5V. Both the rise and fall times for the VCC power-up/down pulses were controlled to be 15ms.
CMPWR160
In the line transient characterizations the VCC supply voltage was controlled to step between 4.5 to 5.5V. For the POR response characterization VCC and SD were tied to ground and the VOUT voltage was directly driven between 2.7 and 3.1V. This was done by connecting a function generator directly to the output of the device. These voltage values were picked because it drove VOUT directly across the typical POR threshold voltage of 2.9V. VCC was tied to ground to show that the POR circuitry will operate even when the VCC supply voltage is not present. The oscilloscope traces show the full bandwidth response at the SD, POR, VCC and VOUT pins depending on the characterization.
CMPWR160 VCC VCC + C1 10F C2 0.1F SD POR VOUT GND POR VOUT + C3 0.1F GND C4 10F (500mA) 6.6
GND
Figure 6. Transient Characterization Test Setup
VCC power-up Cold Start
Figure 7 shows the output response during an initial VCC power up with SD tied to VCC. When VCC reaches a particular threshold, the regulator turns on. The uncharged output capacitor causes maximum inrush current to flow. At this point the device sees the output as a short circuit and the device enters a protective current limiting mode. The output capacitor quickly charges and VOUT rises. Once this voltage rises to just below VCC the inrush current stops flowing and the output rises with the input. VOUT continues to rise with the input until it reaches 3.3V.
Tek Run 25.0kS/s Sample
VCC
VOUT
(500mA Load)
1.00V
Ch2 1.00V M 2.00ms Ch2
280mV
Figure 7. VCC Power-up Cold Start
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
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215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
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CALIFORNIA MICRO DEVICES
Typical Transient Characteristics continued
Tek Run 25.0kS/s Sample
CMPWR160
VCC Power down
Figure 8 shows the output response of the regulator during a complete power down situation under full load conditions with SD tied to VCC.
VOUT VCC
(500mA Load) 1.00V Ch2 1.00V M 2.00ms Ch2 3.50V
Figure 8. VCC Power Down Shutdown Transient Response
The transient response of the output voltage to the SD pin is shown in Figure 9. The graph shows that a rising edge on the SD pin enables the regulator and a falling edge disables the regulator. The rise and fall time for the output voltages are 100s and 200s respectively.
(500mA Load) Tek 25.0kS/s 3 Acqs
2
SD
VOUT
1.00V
Ch2 5.00V
M 200s Ch2
3.0V
Figure 9. Shutdown Transient Response
POR Response
The transient response of the active low POR pin to VOUT is shown in Figure 10. When VOUT rises above the POR threshold voltage (typically 2.9V), the pin is forced to logic low (0V). The pin remains at logic low for 30ms then it is forced to logic high (3.3V). If VOUT falls below the POR threshold voltage during this 30ms interval POR will remain logic low. If it falls below the voltage threshold and then recovers the 30ms time will reset. When VOUT falls below the POR threshold voltage POR is immediately forced to logic low. VCC is tied to ground to show that the POR circuitry will work without VCC present.
POR Tek Run 5.0kS/s Sample
3.1V VOUT 2
2.7V
1.00V
Ch2 200mV M 10.0ms Ch2
2.90V
Figure 10. POR Response
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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CALIFORNIA MICRO DEVICES
Typical Transient Characteristics continued
Load Step response
Figure 11 shows the output voltage (Ch1) response of the regulator during a step load change between 5mA and 500mA (represented on Ch2). For the 5mA to 500mA transition an initial transient overshoot of 60mV occurs and then the output settles to its final voltage within 20s. For the 500mA to 5mA transition there is also an initial overshoot of 60mV however it takes approximately 250s to settle to its final voltage. The overall DC voltage disturbance on the output is approximately 25mV, which demonstrates the regulator output impedance of 50m. VOUT offset = 3.3V
Tek Run 250kS/s Sample
CMPWR160
500mA Load 5mA
1 VOUT (offset = 3.3V)
Ch1 50.0mV
2.00V
M 200s Ch2
1.60V
Figure 11. Load Step Response Line Step Response
Figure 12 shows the output response of the regulator to a VCC line voltage transient between 4.5V and 5.5V (1Vpp as shown on Ch2). The load condition during this test is 5mA. The output response produces less than 10mV of disturbance on both edges indicating a line rejection of better than 40dB at high frequencies. VOUT offset = 3.3V
Tek 250kS/s 2 Acqs
5.5V 2 VCC
4.5V (5mA Load)
VOUT(offset = 3.3V)
20.0mV Ch2 500mV M 200s Ch2
5.00V
Figure 12. Line Step Response Reset response time with overdrive
Figure 13 shows the time it takes for the POR signal to reset when the output voltage is driven below the POR trigger threshold by varying amounts. The amount the voltage is driven below the POR trigger threshold is the overdrive voltage.
1000
Turn Off Delay (s)
100
10
1
0
50
100
150
200
250
300
Overdrive (mV)
Figure 13. Reset Response Time with Overdrive
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
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Tel: (408) 263-3214
Fax: (408) 263-7846
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CALIFORNIA MICRO DEVICES
Typical Thermal Characteristics
Thermal dissipation of junction heat consists primarily of two paths in series. The first path is the junction to the case (JC) thermal resistance which is defined by the package style, and the second path is the case to ambient (CA) thermal resistance, which is dependent on board layout. The overall junction to ambient (JA) thermal resistance is equal to: JA = JC + CA For a given package style and board layout, the operating junction temperature is a function of junction power dissipation PJUNC, and the ambient temperature, resulting in the following thermal equation: TJUNC = TAMB + PJUNC (JC ) + PJUNC (CA ) = TAMB + PJUNC (JA) The CMPWR160SA is housed in a thermally enhanced package where all the GND pins (5 through 8) are integral to the leadframe (fused leadframe). When the device is mounted on a double sided printed circuit board with two square inches of copper allocated for "heat spreading", the resulting JA is 50C/W.
CMPWR160
Based on a maximum power dissipation of 1.0W (2Vx500mA) with an ambient of 70C the resulting junction temperature will be: TJUNC = TAMB + PJUNC (JA ) = 70C + 1.0W (50C/W) = 70C + 50C = 120C All thermal characteristics of the CMPWR160SA were measured using a double sided board with two square inches of copper area connected to the GND pins for "heat spreading". Measurements showing performance up to junction temperature of 125C were performed under light load conditions (5mA). This allows the ambient temperature to be representative of the internal junction temperature. Note: The use of multi-layer board construction with power planes will further enhance the thermal performance of the package. In the event of no copper area being dedicated for heat spreading, a multi-layer board construction, using only the minimum size pad layout, will typically provide the CMPWR160SA with an overall JA of 70C/W which allows up to 780mW to be safely dissipated.
Output Voltage vs. Temperature
Figure 14 shows the regulator VOUT performance up to the maximum rated junction temperature. A 125C variation in junction temperature from -25C causes an output voltage variation of about 50mV, reflecting a voltage temperature coefficient of approximately 50ppm/C.
3.35 3.33
VOUT (v)
3.31 3.29 3.27 3.25 -25
0
25
50
75
100
125
Temperature (C)
Figure 14. VOUT Temperature Variation (5mA)
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035
12/5/2000
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
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CALIFORNIA MICRO DEVICES
Typical Thermal Characteristics continued
Output Voltage (Rated) vs. Temperature
Figure 15 shows the regulator steady state performance when fully loaded (500mA) from -25C up to the rated maximum temperature of 70C. The output variation at maximum load is approximately 20mV across the shown operating temperature. This translates to a temperature coefficient of approximately 30ppm/C.
3.34 3.32
VOUT (v)
CMPWR160
3.30 3.28 3.26 3.24 -25
0
25 Temperature (C)
50
Figure 15. VOUT Temperature Variation (500mA)
POR Voltage Threshold Temperature Variation
Figure 16 shows the POR threshold voltage variation from -25C up to the maximum rated junction temperature. The overall 150C change in junction temperature causes less than a 5mV variation in the POR threshold voltage. This translates to a temperature coefficient of 6ppm/C. The POR pulse duration does not vary with temperature.
3.00
POR Threshold (v)
2.95
2.90
2.85
3.24 -25
0
25
50
75
100
125
Temperature (C)
Figure 16. POR Threshold Temperature Variation VCC Supply Current Temperature Variation
Figure 17 shows the VCC supply current variation with temperature from -25C to the maximum rated junction temperature with no load on the device. The supply current changes less than 1A over the entire 150C range shown in the plot.
40 38
Current (A)
36 34 32 30 -25
0
25
50
75
100
125
Temperature (C)
Figure 17. VCC Supply Current vs. Temperature
(c)2000 California Micro Devices Corp. All rights reserved. SmartORTM is a trademark of California Micro Devices Corporation.
10
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
12/5/2000

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