Datasheet

ManualsBrandsMicrochip ManualsIntegrated Circuits (ICs)LDO Voltage Regulator 5V 70mA SOT-223

MCP1790/MCP1791

Features

• 48V (43.5V ±10%) load dump protected for <500 ms

with a 30 second repetition rate (FORD Test Pulse

G Loaded)

• Wide steady state supply voltage, 6.0V - 30.0V

• Extended Junction Temperature Range:

-40 to +125°C

• Fixed output voltages: 3.0V, 3.3V, 5.0V

• Low quiescent current: 70 µA typical

• Low shutdown quiescent current: 10 µA typical

• Output Voltage Tolerances of ±2.5% over the

temperature range

• Maximum output current of 70 mA @ +125°C

Junction Temperature

• Maximum continuous input voltage of 30V

• Internal thermal overload protection, +157°C

(typical) Junction Temperature

• Internal short circuit current limit, 120 mA (typical)

for +5V option

• Short Circuit Current Foldback

• Shutdown Input option (MCP1791)

• Power Good Output option (MCP1791)

• High PSRR, -90 dB@100 Hz (typical)

• Stable with 1 µF to 1000 µF Tantalum and

Electrolytic Capacitors

• Stable with 4.7 µF to 1000 µF Ceramic Capacitors

Applications

• Low Voltage A/C powered (24VAC) Fire Alarms,

Sensors, HVAC Controls

• Automotive Electronics

• Automotive Accessory Power Adapters

• Electronic Thermostat Controls

• Microcontroller power

General Description

The MCP1790/MCP1791 regulator provides up to 70 mA

of current. The input operating voltage range is specified

from 6.0V to 30V continuous, 48V absolute max, making

it ideal for automotive and commercial 12/24 VDC

systems.

The MCP1790/MCP1791 has a tight tolerance output

voltage load regulation of ±0.2% (typical) and a very

good line regulation at ±0.0002%/V (typical). The

regulator output is stable with ceramic, tantalum and

electrolytic capacitors. The MCP1790/MCP1791

regulator incorporates both thermal and short circuit

protection.

The MCP1790 is the 3-pin version of the MCP1790/

MCP1791 family. The MCP1791 is the 5-pin version

and incorporates a Shutdown input signal and a Power

Good output signal.

The regulator is specifically designed to operate in the

automotive environment and will survive +48V (43.5V

±10%) load dump transients and double-battery jumps.

The device is designed to meet the stringent quiescent

current requirements of the automotive industry. The

device is also designed for the commercial low voltage

fire alarm/detector systems, which use 24 VDC to

supply the required alarms throughout buildings. The

low ground current, 110 µA (typ.), of the CMOS device

will provide a power cost savings to the end users over

similar bipolar devices. Typical buildings using

hundreds of 24V powered fire and smoke detectors can

see substantial savings on energy consumption and

wiring gage reduction compared to bipolar regulators.

The MCP1790 device will be offered in the 3-pin

DD-PAK, and SOT-223 packages.

The MCP1791 device will be offered in the 5-pin

DD-PAK, and SOT-223 packages.

The MCP1790/MCP1791 will have a junction

temperature operating range of -40°C to +125°C.

70 mA, High Voltage Regulator

Summary of content (34 pages)

PAGE 1
MCP1790/MCP1791 70 mA, High Voltage Regulator Features General Description • 48V (43.5V ±10%) load dump protected for <500 ms with a 30 second repetition rate (FORD Test Pulse G Loaded) • Wide steady state supply voltage, 6.0V - 30.0V • Extended Junction Temperature Range: -40 to +125°C • Fixed output voltages: 3.0V, 3.3V, 5.0V • Low quiescent current: 70 µA typical • Low shutdown quiescent current: 10 µA typical • Output Voltage Tolerances of ±2.
PAGE 2
MCP1790/MCP1791 Package Types MCP1790 DDPAK-3 MCP1791 SOT-223-3 DDPAK-5 SOT-223-5 4 1 2 3 1 Pin DS22075B-page 2 6 2 3 1 2 3 4 5 1 2 3 4 5 Pin 1 VIN 1 SHDN 2 GND (TAB) 2 3 VOUT VIN 4 GND (TAB) 3 GND (TAB) 4 VOUT 5 PWRGD 6 GND (TAB) © 2010 Microchip Technology Inc.
PAGE 3
MCP1790/MCP1791 TYPICAL APPLICATION PWRGD MCP1791 R1 100 kΩ On SHDN Off VIN VIN = 6V to 30V 1 VOUT VOUT = 5.0V @ 70 mA GND C1 4.7 µF C2 1 µF Tantalum MCP1790 1 VIN = 8.0V to 16V VIN 5Ω VOUT C1 1.0 µF GND © 2010 Microchip Technology Inc. VOUT = 3.3V @ 70 mA C2 1.
PAGE 4
MCP1790/MCP1791 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Input Voltage, VIN ........................................................+48.0V † Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied.
PAGE 5
MCP1790/MCP1791 AC/DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise noted, VIN = VOUT(MAX) + VDROPOUT(MAX), (Note 1), IOUT = 1 mA, COUT = 4.7 µF (X7R Ceramic), CIN = 4.7 µF (X7R Ceramic), TA = +25°C, SHDN > 2.4V. Boldface type applies for junction temperatures, TJ (Note 5) of -40°C to +125°C. Parameters Symbol Min Typ Max Units Conditions Short Circuit Foldback Voltage Corner VFOLDBACK — 4.2 — V VR = 5.0V Falling VOUT, RLOAD < 0.1Ω — 3.0 — V VR = 3.
PAGE 6
MCP1790/MCP1791 AC/DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise noted, VIN = VOUT(MAX) + VDROPOUT(MAX), (Note 1), IOUT = 1 mA, COUT = 4.7 µF (X7R Ceramic), CIN = 4.7 µF (X7R Ceramic), TA = +25°C, SHDN > 2.4V. Boldface type applies for junction temperatures, TJ (Note 5) of -40°C to +125°C.
PAGE 7
MCP1790/MCP1791 TEMPERATURE SPECIFICATIONS Parameters Symbol Min Typ Max Units Conditions Specified Temperature Range TJ -40 — +125 °C — Operating Temperature Range TJ -40 — +125 °C — Storage Temperature Range TA -55 — +150 °C — Thermal Resistance, 3LD DDPAK θJA θJC — 31.4 3 — °C/W EIA/JEDEC JESD51-751-7 4 Layer Board Thermal Resistance, 3LD SOT-223 θJA θJC — 62 15 — °C/W EIA/JEDEC JESD51-751-7 4 Layer Board Thermal Resistance, 5LD DDPAK θJA θJC — 31.
PAGE 8
MCP1790/MCP1791 2.0 TYPICAL PERFORMANCE CHARACTERISTICS Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
PAGE 9
MCP1790/MCP1791 Note: Unless otherwise indicated, COUT = 4.7 uF Ceramic (X7R), CIN = 10.0 µF Ceramic (X7R), IOUT = 1 mA, Temperature = +25°C, VIN = 6.0V, RPWRGD_PULLUP = 10 kΩ To VOUT, VSHDN = VIN, and device is MCP1790. VOUT = 3.3V VIN = 6V to 30V 0.004 0 mA 10 mA 0.002 Output Voltage (V) Line Regulation (%/V) 0.006 0.000 -0.002 70 mA -0.004 -0.006 -45 -20 5 30 55 80 105 5.04 5.03 5.02 5.01 5.00 4.99 4.98 4.97 4.96 4.95 4.94 VOUT = 5.0V VIN = 6.
PAGE 10
MCP1790/MCP1791 Note: Unless otherwise indicated, COUT = 4.7 uF Ceramic (X7R), CIN = 10.0 µF Ceramic (X7R), IOUT = 1 mA, Temperature = +25°C, 130 ROUT < 0.1Ω 125 120 VOUT = 5.0V 115 PSRR (dB) Short Circuit Current (mA) VIN = 6.0V, RPWRGD_PULLUP = 10 kΩ To VOUT, VSHDN = VIN, and device is MCP1790. VOUT = 3.3V 110 105 VOUT = 3.0V 100 6 10 14 18 22 26 30 Input Voltage (V) FIGURE 2-13: Input Voltage. Short Circuit Current vs 10.00 Noise (μV/ Hz) VR=5.
PAGE 11
MCP1790/MCP1791 Note: Unless otherwise indicated, COUT = 4.7 uF Ceramic (X7R), CIN = 10.0 µF Ceramic (X7R), IOUT = 1 mA, Temperature = +25°C, VIN = 6.0V, RPWRGD_PULLUP = 10 kΩ To VOUT, VSHDN = VIN, and device is MCP1790. Dynamic Line Response. FIGURE 2-22: Output Voltage (V) FIGURE 2-19: Dynamic Load Response. 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 VOUT = 3.3V VOUT = 3.0V 0 20 40 60 80 100 120 140 Output Current (mA) FIGURE 2-20: Dynamic Line Response.
PAGE 12
MCP1790/MCP1791 Note: Unless otherwise indicated, COUT = 4.7 uF Ceramic (X7R), CIN = 10.0 µF Ceramic (X7R), IOUT = 1 mA, Temperature = +25°C, Startup Ground Current (µA) VIN = 6.0V, RPWRGD_PULLUP = 10 kΩ To VOUT, VSHDN = VIN, and device is MCP1790. 90 80 70 60 50 40 30 20 10 0 IOUT = 1 mA VOUT = 5.0V VOUT = 3.3V 0 1 2 3 4 5 6 7 Input Voltage (V) FIGURE 2-25: DS22075B-page 12 Startup Ground Current. © 2010 Microchip Technology Inc.
PAGE 13
MCP1790/MCP1791 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1 and Table 3-2. TABLE 3-1: Pin No. SOT-223-3 MCP1790 PIN FUNCTION TABLE Pin No. DDPAK-3 Symbol Function 1 1 VIN 2,Tab 2,Tab GND Ground Terminal 3 3 VOUT Regulated Output Voltage TABLE 3-2: Unregulated Supply Voltage MCP1791 PIN FUNCTION TABLE Pin No. SOT-223-5 Pin No.
PAGE 14
MCP1790/MCP1791 4.0 DEVICE OVERVIEW 4.4 The MCP1790/MCP1791 are high input voltage regulators capable of providing up to 70 mA of current at output voltages up to 5.0V. The devices have an input voltage operating range from 6.0V to 30V, 48V absolute max. The MCP1790 devices are 3-pin devices consisting of VIN, VOUT and GND. The MCP1791 devices have 5 or more pins which add Shutdown and Power-Good functions to the MCP1790 device. 4.1 4.4.
PAGE 15
MCP1790/MCP1791 4.5 Shutdown (SHDN) 4.6 The MCP1791 has a Shutdown (SHDN) input signal that enables or disables the regulator output voltage. When the SHDN input signal is greater than 2.40V, the regulator output voltage is enabled. Note that the regulator output may still be disabled by the undervoltage lockout incorporated within the VIN circuitry. The value of the SHDN signal to put the regulator into Shutdown mode is ≤0.8V. The SHDN pin is pulled low by an internal resistor.
PAGE 16
MCP1790/MCP1791 4.8 Output Current and Current Limiting The MCP1790/MCP1791 devices are tested and ensured to supply a minimum of 70 mA of output current. The MCP1790/MCP1791 also incorporate an output current limit foldback. When the regulator is in an overcurrent condition, VOUT will decrease with increasing load. When VOUT falls below 30% (typical) of VR, the output current will start to fold back. The output current will fold back to less than 100 mA (typical) when VOUT is near 0 volts. The 5.
PAGE 17
MCP1790/MCP1791 4.9 Power Good Output (PWRGD) The MCP1791 has an open-drain Power Good (PWRGD) output signal capable of sinking a minimum of 5.0 mA of current while maintaining a PWRGD output voltage of 0.4V or less. VPWRGD_TH VOUT As the output voltage of the LDO rises, the PWRGD output will be held low until the output voltage has exceeded the power good threshold (VPWRGD_TH) level by an amount equal to the power good hysteresis value ((VPWRGD_HYS), typically 2% of VR.
PAGE 18
MCP1790/MCP1791 5.0 APPLICATION CIRCUITS/ ISSUES 5.1 Typical Application The MCP1790/MCP1791 is most commonly used as a voltage regulator. It is a high voltage input capability and thermal protection make it ideal for automotive and 24V industrial applications. MCP1791 1 VIN 5 5 4 FIGURE 5-1: PWRGD 10 kΩ CIN 1 µF Ceramic 24 VDC 5.1.1 3 2 1N4002 + VOUT + COUT 4.7 µF Ceramic 5V@70 mA Typical Application.
PAGE 19
MCP1790/MCP1791 5.3 Power Dissipation Example Internal power dissipation, junction temperature rise, junction temperature and maximum power dissipation are calculated in the following example. The power dissipation, as a result of ground current, is small enough to be neglected. 5.3.1 5.3.1.2 To estimate the internal junction temperature, the calculated temperature rise is added to the ambient or offset temperature. For this example, the worst-case junction temperature is estimated below.
PAGE 20
MCP1790/MCP1791 6.0 PACKAGING INFORMATION 6.1 Package Marking Information 3-Lead DDPAK (MCP1790) XXXXXXXXX XXXXXXXXX YYWWNNN 1 2 MCP1790 e3 50EEB^^ 1005256 3 1 3-Lead SOT-223 (MCP1790) XXXXXXX XXXYYWW NNN Legend: XX...
PAGE 21
MCP1790/MCP1791 6.1 Package Marking Information (Continued) 5-Lead DDPAK (Fixed) (MCP1791) Example: XXXXXXXXX XXXXXXXXX YYWWNNN MCP1791 e3 50EET^^ 1005256 1 2 3 4 5 1 2 3 4 5 5-Lead SOT-223 (MCP1791) XXXXXXX XXXYYWW NNN Legend: XX...
PAGE 22
MCP1790/MCP1791 0 # " & 1 $ / "2 " " 3 1 $ -44/// # #4 1 E E1 L1 D1 D H 1 N b e BOTTOM VIEW TOP VIEW b1 CHAMFER OPTIONAL C2 A φ c A1 L 5 " # " 8 # " 6&#; 3 " 6!7% 6 6 69 : * 3 9. 7 < = $ = 9. > $ % *? = %' " $ 3 $ > $ % ( = = $ $ 3 1 8 ** = *? 9.
PAGE 23
MCP1790/MCP1791 ! ! "" 0 # " & 1 $ / "2 " " 3 1 $ -44/// # #4 1 D b2 E1 E 3 2 1 e e1 A2 A b c φ L A1 5 " # " 8 # " 6&#; 8 $" 88 % % 6 69 : 6 * 8 $ 3 * , ! 9& " $ 8 $ 3 9. 7 = = ? $ = $ $ 3 1 7 ( < 9.
PAGE 24
MCP1790/MCP1791 ! ! "" 0 # " & 1 $ / "2 " " 3 1 $ -44/// # #4 1 DS22075B-page 24 © 2010 Microchip Technology Inc.
PAGE 25
MCP1790/MCP1791 # 0 # " & 1 $ / "2 " " 3 1 $ -44/// # #4 1 E1 E L1 D1 D H 1 N b BOTTOM VIEW e TOP VIEW CHAMFER OPTIONAL C2 A φ c A1 L 5 " # " 8 # " 6&#; 3 " 6!7% 6 6 69 : ( 3 9. 7 < = $ = 9. > $ % *? = %' " $ 3 $ > $ % ( = = $ $ 3 1 8 ** = *? 9.
PAGE 26
MCP1790/MCP1791 # ! ! $ "" 0 # " & 1 $ / "2 " " 3 1 $ -44/// # #4 1 D b2 E E1 3 2 1 4 N e e1 A2 A b c φ L A1 5 " # " 8 # " 6&#; 8 $" 88 % % 6 69 : 6 ( 8 $ 3 , ! 9& " $ 8 $ 3 9. 7 = = ? $ < $ $ 3 1 7 (( < <( 9.
PAGE 29
MCP1790/MCP1791 APPENDIX A: REVISION HISTORY Revision B (September 2010) The following is the list of modifications: • Updated the Features section. • Removed conditions for the Output Voltage Regulation parameter in the AC/DC Characteristics table. • Updated the symbol used for the Storage Temperature Range parameter in the TEMPERATURE SPECIFICATIONS table. Revision A (March 2008) • Original Release of this Document. © 2010 Microchip Technology Inc.
PAGE 31
MCP1790/MCP1791 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device XX X X X/ XX Output Feature Tolerance Temp. Package Voltage Code Device: MCP1790: 70 mA High Voltage Regulator MCP1790T: 70 mA High Voltage Regulator Tape and Reel MCP1791: 70 mA High Voltage Regulator MCP1791T: 70 mA High Voltage Regulator Tape and Reel = 3.0V “Standard” = 3.3V “Standard” = 5.
PAGE 33
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 34
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