LDFM33PUR

LDFM STMICROELECTRONICS | Alldatasheet

Document overview

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• PDF pages: 36

Technical content

Datasheet sections

• 1 Block diagram
• 2 Pin configuration
• 3 Typical application
• 4 Absolute maximum ratings
• 5 Electrical characteristics
• 6 Application information
• 6.1 External capacitors
• 6.1.1 Input capacitor
• 6.1.2 Output capacitor
• 6.2 Enable pin operation
• 6.3 Power Good
• 7 Typical performance characteristics
• 8 Package information
• 8.1 PPAK package information
• 8.2 PPAK packing information
• 8.3 DPAK (TO-252) package information
• 8.4 DPAK (TO-252) packing information
• 8.5 DFN6 (2x2) package information
• 8.6 DFN6 (2x2) packing information
• 8.7 DFN6 (3x3) package information
• 8.8 DFN6 (3x3) packing information
• 9 Ordering information
• 10 Revision history

Features

 Input voltage from 2.5 to 16 V  Very low dropout voltage (300 mV max. at 500 mA load)  Low quiescent current (200 µA typ. @ 500 mA load)  Available in 1% precision in PPAK and DFN6 packages, 2% in DPAK  500 mA guaranteed output current  Wide range of output voltages available on request: adjustable from 0.8 V, fixed up to

12 V in 100 mV steps

 Logic-controlled electronic shutdown  Power Good (PPAK and DFN packages)  Fast dynamic response to line and load changes  Internal current and thermal protection  Temperature range: - 40 °C to 125 °C

Applications

 PCs and laptop computers  Battery-powered equipment  Industrial and medical equipment  Portable equipment

Description

The LDFM is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.5 V to 16 V. It is available in fixed and adjustable output voltage versions, from 0.8 V to 12 V. The LDFM features high output precision, very low dropout voltage, low noise, and low quiescent current, therefore suitable for low voltage microprocessors and memory applications. Enable logic control pin and Power Good output are featured on PPAK/DFN packages. Current and thermal protection are provided.

1 Block diagram

Figure 1: Block diagram (generic version)

2 Pin configuration

Figure 2: Pin connection (top view) Table 1: Pin description DPAK, PPAK Pin n° Symbol Function PPAK DPAK 5 - ADJ/PG For adjustable versions: error amplifier input pin. For fixed version: Power Good output 2 1 VIN Input voltage 4 3 VOUT Output voltage 1 - EN Enable pin logic input: Low = shutdown, High = active 3 2 GND Ground TAB TAB GND Ground Table 2: Pin description DFN6-2x2 and 3x3 Pin n° Symbol Function 2 ADJ/NC For adjustable versions: error amplifier input pin. For fixed version: not connected

6 VIN Input voltage

1 VOUT Output Voltage

5 EN Enable pin logic input: low = shutdown, high = active

3 PG Power good output

4 GND Ground

3 Typical application

Figure 3: Fixed versions Figure 4: Adjustable version (PPAK and DFN6 packages only)

Absolute maximum ratings LDFM

4 Absolute maximum ratings

Table 3: Absolute maximum ratings Symbol Parameter Value Unit VIN DC input voltage - 0.3 to 20 V VOUT DC output voltage - 0.3 to VIN + 0.3 V VEN Enable input voltage - 0.3 to VIN + 0.3 V VADJ Adjust pin voltage - 0.3 to 2 V VPG Power Good pin voltage - 0.3 to VIN + 0.3 V ILOAD Output current Internally limited mA PD Power dissipation Internally limited mW TSTG Storage temperature range - 65 to 150 °C TOP Operating junction temperature range - 40 to 125 °C Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. All values are referred to GND. Table 4: Thermal data Symbol Parameter Value Unit PPAK DPAK DFN6-2x2 DFN6-3x3 RthJA Thermal resistance junction-ambient 100 100 65 55 °C/W RthJC Thermal resistance junction-case 8 8 6.5 10 °C/W

5 Electrical characteristics

TJ = 25 °C, VIN = VOUT(NOM) + 1 Va, CIN = 1 µF, COUT = 2.2 µF, ILOAD = 10 mA, VEN = 2 V, unless otherwise specified. Table 5: Electrical characteristics for LDFM (fixed versions) Symbol Parameter Test conditions Min. Typ. Max. Unit VIN Operating input voltage 2.5 16 V VOUT VOUT accuracy, PPAK and DFN6 versions VOUT+1 V≤ VIN≤ 16 V(1) ILOAD = 10 mA -1 1 % 10 mA ≤ ILOAD≤ 500 mA TJ = -40 to 125 °C -1.5 1.5 % VOUT VOUT accuracy, DPAK version VOUT+1 V(1) ≤ VIN ≤ 16 V ILOAD = 10 mA -2 2 % 10 mA ≤ ILOAD ≤ 500 mA TJ = -40 to 125 °C -3 3 % ∆VOUT Static line regulation VOUT+1 V(1) ≤ VIN ≤ 16 V 0.01 %/V VOUT+1 V(1) ≤ VIN ≤ 16 V, TJ = -40 to 125 °C 0.04 ∆VOUT Static load regulation 10 mA ≤ ILOAD ≤ 500 mA 0.1 %/A 10 mA ≤ ILOAD ≤ 500 mA, TJ = -40 to 125 °C 0.15 0.4 10 mA ≤ ILOAD ≤ 500 mA, TJ = -40 to 125 °C DFN6 version 10 mV VDROP Dropout voltage (2) ILOAD = 500 mA, -40 °C < TJ < 125 °C 125 300 mV IQ Quiescent current ON mode: VEN = 2 V ILOAD= 10 mA to 500 mA, TJ = -40 to 125 °C 200 800 µA OFF Mode:VEN = GND, PPAK and DFN versions OFF Mode:VEN = GND, PPAK and DFN versions, -40 °C < TJ < 125 °C 120 ISC Short-circuit current 0.8 A VEN Enable input logic low VIN = 2.5 V to 16 V, -40 °C<TJ<125 °C 0.8 V Enable input logic high 2 IEN Enable pin input current VEN = VIN 5 10 µA PG Power Good output threshold Rising edge 0.92* VOUT V a For VOUT < 1.5 V; VIN = 2.5 V.

Electrical characteristics LDFM Symbol Parameter Test conditions Min. Typ. Max. Unit Falling edge 0.8* VOUT Power Good output voltage low ISINK = 6 mA, open drain output 0.4 SVR Supply voltage rejection VIN = 6 V +/- 0.5 VRIPPLE Freq. = 120 Hz, VOUT = 5 V dB VIN = 6 V +/- 0.5 VRIPPLE Freq. = 10 kHz, VOUT = 5 V eN Output noise voltage Bw = 10 Hz to 100 kHz, ILOAD = 100 mA. COUT = 2.2 µF µVRMS/ VOUT TSHDN Thermal shutdown 170 Hysteresis Notes: (1)For VOUT < 1.5 V; VIN = 2.5 V. (2)Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply for output voltages below 1.5 V.

TJ = 25 °C, VIN = VOUT(NOM) + 1 Va, CIN = 1 µF, COUT = 2.2 µF, ILOAD = 10 mA, VEN = 2 V, unless otherwise specified. Table 6: Electrical characteristics for LDFM (adjustable version) Symbol Parameter Test conditions Min. Typ. Max. Unit VIN Operating input voltage 2.5 16 V VADJ Reference voltage VIN = VOUT+1 V(1) 0.8 V Reference voltage tolerance VOUT+1 V(1) ≤ VIN ≤ 16 V ILOAD = 10 mA -1 10 mA ≤ ILOAD ≤ 500 mA TJ = -40 to 125 °C -1.5 1.5 ∆VOUT Static line regulation VOUT+1 V (1) ≤ VIN ≤ 16 V 0.01 %/V VOUT+1 V(1) ≤ VIN ≤ 16 V, TJ = -40 to 125 °C 0.04 ∆VOUT Static load regulation 10 mA ≤ ILOAD ≤ 500 mA 0.06 %/A 10 mA ≤ ILOAD ≤ 500 mA, TJ = -40 to 125 °C 0.2 0.4 10 mA ≤ ILOAD ≤ 500 mA, TJ = -40 to 125 °C DFN6 version VDROP Dropout voltage (2) VOUT fixed to 2.5 V, ILOAD = 500 mA, -40 °C < TJ < 125 °C 125 300 mV IQ Quiescent current ON mode: VEN = 2 V ILOAD= 10 mA to 500 mA, TJ = -40 to 125 °C 200 800 µA OFF Mode:VEN = GND, PPAK and DFN versions OFF Mode:VEN = GND, PPAK and DFN versions, -40 °C < TJ < 125 °C 120 ISC Short-circuit current 0.8 A VEN Enable input logic low VIN= 2.5 V to 16 V, -40 °C < TJ < 125 °C 0.8 V Enable input logic high 2 IEN Enable pin input current VEN = VIN 5 10 µA PG Power Good output threshold Rising edge 0.92* VADJ V Falling edge 0.8* VADJ Power Good output voltage low ISINK = 6 mA, open drain output 0.4 a For VOUT < 1.5 V; VIN = 2.5 V.

Electrical characteristics LDFM Symbol Parameter Test conditions Min. Typ. Max. Unit SVR Supply voltage rejection VIN = VOUT+1 V +/- 0.5 VRIPPLE Freq. = 120 Hz, VOUT = 0.8 V dB VIN = VOUT+1 V +/- 0.5 VRIPPLE Freq. = 10 kHz, VOUT = 0.8 V eN Output noise voltage Bw = 10 Hz to 100 kHz, ILOAD = 100 mA. COUT = 2.2 µF µVRMS/ VOUT TSHDN Thermal shutdown 170 Hysteresis Notes: (1)For VOUT < 1.5 V; VIN = 2.5 V. (2)Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply for output voltages below 1.5 V.

6 Application information

6.1 External capacitors

The LDFM requires external capacitors for regulator stability. These capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see Figure 25: "Stability plane adj (COUT, ESR)" and Figure 26: "Stability plane 3.3 V (COUT, ESR)"). It is advisable to locate the input/output capacitors as close as possible to the relative pins.

6.1.1 Input capacitor

An input capacitor with a minimum value of 1 µF is required with the LDFM. This capacitor must be located a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. Any good quality ceramic capacitors can be used for this capacitor.

6.1.2 Output capacitor

It is possible to use ceramic capacitors but the output capacitor must meet the requirements for minimum amount of capacitance and E.S.R. (equivalent series resistanc e) value. A minimum capacitance of 2.2 µF is a good choice to guarantee the stability of the regulator. However, other COUT values can be used according to Figure 25: "Stability plane adj (COUT, ESR)" and Figure 26: "Stability plane 3.3 V (COUT, ESR)", showing the allowable ESR range as a function of the output capacitance. The output capacitor must maintain its ESR in the stable region over the full operating temperature range to assure stability. Also, capacitor tolerance and variation with temperature must be kept in consideration in order to assure the minimum amount of capacitance at all times.

6.2 Enable pin operation

The Enable pin can be used to turn OFF the regulator when pulled down, so drastically reducing the current consumption. When the enable feature is not used, this pin must be tied to VIN to keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the Enable pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section (VEN). The Enable pin must not be left floating because it is not internally pulled down/up.

6.3 Power Good

The LDFM features an open drain Power Good (PG) pin to sequence external supplies or loads and to provide fault detection. This pin requires an external resistor (RPG) to pull PG high when the output is within the PG tolerance window. Typical values for this resistor range from 10 kΩ to 100 kΩ.

Typical performance characteristics LDFM

7 Typical performance characteristics

CIN = COUT = 1 µF, VIN = VOUT +1 V, VEN to VIN, IOUT = 10 mA, unless otherwise specified. Figure 5: Output voltage vs temperature Figure 6: Output voltage vs temperature for adjustable Figure 7: Line regulation vs temperature Figure 8: Load regulation vs temperature Figure 9: Short-circuit current vs drop voltage Figure 10: Dropout voltage vs temperature

8 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK ® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.

8.1 PPAK package information

Figure 27: PPAK package outline

Table 7: PPAK mechanical data Dim. mm Min. Typ. Max. A 2.2 2.4 A1 0.9 1.1 A2 0.03 0.23 B 0.4 0.6 B2 5.2 5.4 C 0.45 0.6 C2 0.48 0.6 D 6 6.2 5.1 E 6.4 6.6 4.7 e 1.27 G 4.9 5.25 G1 2.38 2.7 H 9.35 10.1 0.8 1 L4 0.6 L5 1 2.8 R 0.20 V2 0°

8.2 PPAK packing information

Figure 28: PPAK tape outline

Figure 29: PPAK reel outline Table 8: PPAK tape and reel mechanical data Tape Reel Dim. mm Dim. mm Min. Max. Min. Max. A0 6.8 7 A 330 B0 10.4 10.6 B 1.5 12.1 C 12.8 13.2 D 1.5 1.6 D 20.2 D1 1.5 G 16.4 18.4 E 1.65 1.85 N 50 F 7.4 7.6 T 22.4 K0 2.55 2.75 P0 3.9 4.1 Base qty. 2500 P1 7.9 8.1 Bulk qty. 2500 P2 1.9 2.1 R 40 T 0.25 0.35 W 15.7 16.3

8.3 DPAK (TO-252) package information

Figure 30: DPAK (TO-252) package outline

Table 9: DPAK (TO-252) mechanical data Dim. mm Min. Typ. Max. A 2.20 2.40 A1 0.90 1.10 A2 0.03 0.23 b 0.64 0.90 b4 5.20 5.40 c 0.45 0.60 c2 0.48 0.60 D 6.00 6.20 5.10 E 6.40 6.60 5.20 e 2.28 e1 4.40 4.60 H 9.35 10.10 L 1.00 1.50 (L1) 2.80 0.80 L4 0.60 1.00 R 0.20 V2 0°

Figure 31: DPAK (TO-252) recommended footprint (dimensions are in mm)

8.4 DPAK (TO-252) packing information

Figure 32: DPAK (TO-252) tape outline

Figure 33: DPAK (TO-252) reel outline Table 10: DPAK (TO-252) tape and reel mechanical data Tape Reel Dim. mm Dim. mm Min. Max. Min. Max. A0 6.8 7 A 330 B0 10.4 10.6 B 1.5 12.1 C 12.8 13.2 D 1.5 1.6 D 20.2 D1 1.5 G 16.4 18.4 E 1.65 1.85 N 50 F 7.4 7.6 T 22.4 K0 2.55 2.75 P0 3.9 4.1 Base qty. 2500 P1 7.9 8.1 Bulk qty. 2500 P2 1.9 2.1 R 40 T 0.25 0.35 W 15.7 16.3

8.5 DFN6 (2x2) package information

Figure 34: DFN6 (2x2) package outline

Table 11: DFN6 (2x2) mechanical data Dim. mm Min. Typ. Max. A 0.80 0.90 1.00 A1 0.00 0.02 0.05 b 0.25 0.30 0.35 D 2.00 BSC E 2.00 BSC e 0.65 BSC D2 1.45 1.70 E2 0.85 1.10 L 0.20 0.30 K 0.15 aaa 0.05 bbb 0.10 ccc 0.10 ddd 0.05 eee 0.08 N 6

Figure 35: DFN6 (2x2) recommended footprint

8.6 DFN6 (2x2) packing information

Figure 36: DFN6 (2x2) reel outline Table 12: DFN6 (2x2) tape and reel mechanical data Dim. mm Min. Typ. Max. A 180 C 12.8 13.2 D 20.2 N 60 T 14.4 A0 2.4 B0 2.4 K0 1.3 P0 4 P 4

8.7 DFN6 (3x3) package information

Figure 37: DFN6 (3x3) package outline

Table 13: DFN6 (3x3) mechanical data Dim. mm Min. Typ. Max. A 0.80 A1 0 0.02 0.05 0.20 b 0.23 0.45 D 2.90 3 3.10 D2 2.23 2.50 E 2.90 3 3.10 E2 1.50 1.75 e 0.95 L 0.30 0.40 0.50 Figure 38: DFN6 (3x3) recommended footprint

8.8 DFN6 (3x3) packing information

Figure 39: DFN6 (3x3) tape outline

Figure 40: DFN6 (3x3 mm) reel outline Table 14: DFN6 (3x3) tape and reel mechanical data Dim. mm Min. Typ. Max. A0 3.20 3.30 3.40 B0 3.20 3.30 3.40 K0 1 1.10 1.20

9 Ordering information

Table 15: Order code Order code Package Output voltage LDFMPT-TR PPAK Adjustable from 0.8 V LDFMPUR DFN6-3x3 LDFMPVR DFN6-2x2 LDFM33PUR DFN6-3x3 3.3 V LDFM33PVR DFN6-2x2 LDFM50DT-TR DPAK 5 V LDFM50PT-TR PPAK

Table 16: Document revision history Date Revision Changes 28-Aug-2012 1 Initial release. 22-Nov-2013 2 Part numbers LDFM and LDFM50 have been unified under LDFM. Updated the Features and the Description in cover page. Cancelled Table1: Device summary. Updated Section 2: Pin configuration, Section 3: Typical application, Section 4: Absolute maximum ratings, Section 5: Electrical characteristics and Section 8: Package information. Added Section 8.7: DFN6 (3 x 3 mm) packing information and Section 9: Order code. Minor text changes. 15-Jun-2015 3 Updated Table 5: Electrical characteristics for LDFM (fixed versions) and Table 6: Electrical characteristics for LDFM (adjustable version). Minor text changes. 05-Sep-2016 4 Updated Section 9: "Ordering information". Minor text changes.