Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Cuk SOT 23 5

: TAIYO YUDEN X5R JMK325BJ226MM

CUK

: TAIYO YUDEN X5R EMK316BJ105MF

OUT

: TAIYO YUDEN X5R JMK325BJ226MM

D: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CR32-150

L2: SUMIDA CR32-470

CUK

1 PF

OUT

22 PF

47 PH

330 pF

FB1

29.4k

FB2

10k

NFB

GND

SHDN

LM2611A

22 PF

15 PH

OUT

- 5V

300 mA

LM2611

www.ti.com

SNOS965I –JUNE 2001–REVISED APRIL 2013

LM2611 1.4MHz Cuk Converter

Check for Samples: LM2611

FEATURES

DESCRIPTION

The LM2611 is a current mode, PWM inverting

• 1.4MHz switching frequency

switching regulator. Operating from a 2.7 - 14V

• Low R

DS(ON)

DMOS FET

supply, it is capable of producing a regulated

• 1mVp-p output ripple

negative output voltage of up to −(36-V

IN(MAX)

). The

LM2611 utilizes an input and output inductor, which

• −5V at 300mA from 5V input

enables low voltage ripple and RMS current on both

• Better regulation than a charge pump

the input and the output. With a switching frequency

• Uses tiny capacitors and inductors

of 1.4MHz, the inductors and output capacitor can be

physically small and low cost. High efficiency is

• Wide input range: 2.7V to 14V

achieved through the use of a low R

DS(ON)

FET.

• Low shutdown current: <1µA

The LM2611 features a shutdown pin, which can be

• 5-lead SOT-23 package

activated when the part is not needed to lower the Iq

and save battery life. A negative feedback (NFB) pin

APPLICATIONS

provides a simple method of setting the output

• MR Head Bias

voltage, using just two resistors. Cycle-by-cycle

current limiting and internal compensation further

• Digital camera CCD bias

simplify the use of the LM2611.

• LCD bias

The LM2611 is available is a small SOT23-5

• GaAs FET bias

package. It comes in two grades:

• Positive to negative conversion

Grade A Grade B

Current Limit 1.2A 0.9A

DS(ON)

0.5Ω 0.7Ω

Typical Application Circuit

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (24 pages)

PAGE 1
LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 LM2611 1.4MHz Cuk Converter Check for Samples: LM2611 FEATURES DESCRIPTION • • • • • • • • • The LM2611 is a current mode, PWM inverting switching regulator. Operating from a 2.7 - 14V supply, it is capable of producing a regulated negative output voltage of up to −(36-VIN(MAX)). The LM2611 utilizes an input and output inductor, which enables low voltage ripple and RMS current on both the input and the output. With a switching frequency of 1.
PAGE 2
LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 5-lead SOT-23 Package Top View SW 1 GND 5 VIN 4 SHDN 2 NFB 3 See Package Number DBV0005A Pin Description Pin Name Function 1 SW Drain of internal switch. Connect at the node of the input inductor and Cuk capacitor.
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LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 Electrical Characteristics Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the Temperature Range TJ = −40°C to +85°C, unless otherwise specified. VIN = 5.0V and IL = 0A, unless otherwise specified.
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LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics RDS(ON) Vs. Ambient Temperature VIN = 5V 0.55 1 0.5 0.8 RDS(ON) (:) RDS(ON) (:) RDS(ON) vs VIN 0.45 0.4 0.6 0.4 0.2 0.35 0 -50 0.3 2 4 6 8 10 12 14 150 Switch Current Limit vs. VIN Switch Current Limit vs Ambient Temperature VIN = 5V 1.4 1.4 SWITCH CURRENT LIMIT (A) SWITCH CURRENT LIMIT (A) 100 Figure 2. 1.35 1.3 1.25 1.2 1.15 2 4 6 10 8 1.39 1.38 1.37 1.36 1.
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LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 Typical Performance Characteristics (continued) -1.215 -1.218 -1.22 -1.220 -1.225 -1.222 VNFB (V) VNFB (V) VNFB vs VIN TA = 25°C, VOUT = −5V -1.23 -1.235 -1.224 -1.226 -1.24 -1.228 -1.245 -1.230 -1.25 VNFB vs Ambient Temperature VIN = 5V -1.232 0 10 5 15 -30 -55 70 95 120 TEMPERATURE ( C) Figure 7. Figure 8. INFB vs VIN TA = 25°C, VOUT = −5V INFB vs Ambient Temperature VIN = 3.5V, VOUT = −5V 4.45 4.4 4.4 4.3 4.
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LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com Block Diagram VIN 1 SW 5 R5 R6 - gm - RC Q2 x10 ¦ RAMP GENERATOR R + DRIVER Q s CURRENT LIMIT COMPARATOR 1.4MHz OSCILLATOR R4 140k VO FF R CC R3 30k R + Q1 THERMAL SHUTDOWN PWM COMPARATOR + 0.05 3 NFB - R1 EXTERNAL CFF (OPTIONAL) SHDN 4 SHUTDOWN 2 GND R2 EXTERNAL Operation Cuk Converter + CCUK - + L1 - - L2 + + L1 - + CCUK - - L2 + + + VIN COUT VIN COUT VOUT - a VOUT - b Figure 13.
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LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 vL1(V) VIN t VOUT iL1(A) 'IL1 IL1 t Figure 14. Voltage and Current Waveforms in Inductor L1 of a Cuk Converter The voltage and current waveforms of inductor L2 are shown in Figure 15. During the first cycle of operation, when the switch is closed, VIN is applied across L2. When the switch opens, VOUT is applied across L2. CCUK 2.2PF L1A 22PH VOUT-5V 375mA L1B 22PH VIN 12V 1 5 VDD 5V SW VIN 4 CIN 22PF SHDN LM2611A NFB RFB1 29.
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LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com Switch Current Limit The LM2611 incorporates a separate current limit comparator, making current limit independent of any other variables. The current limit comparator measures the switch current versus a reference that represents current limit. If at any time the switch current surpasses the current limit, the switch opens until the next switching period.
PAGE 9
LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 A general rule of thumb is to keep fESR > 80kHz for LM2611 Cuk designs. Low ESR tantalum capacitors will usually be rated for at least 180mA in a voltage rating of 10V or above. However the ESR in a tantalum capacitor (even in a low ESR tantalum capacitor) is much higher than in a ceramic capacitor and could place fESR low enough to cause the LM2611 to run unstable.
PAGE 10
LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com Hysteretic Mode As the output current decreases, there will come a point when the energy stored in the Cuk capacitor is more than the energy required by the load. The excess energy is absorbed by the output capacitor, causing the output voltage to increase out of regulation. The LM2611 detects when this happens and enters a pulse skipping, or hysteretic mode.
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LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 APPLICATION INFORMATION Application Circuits 5V to -5V Inverting Converter L2 47 PH CCUK L1 15 PH 1 PF VIN VOUT - 5V 300 mA 5V 5 VIN CIN 4 22 PF SHDN LM2611A 1 RFB1 CFF SW 29.4k 330 pF NFB D 3 COUT 22 PF GND RFB2 2 10k CIN: TAIYO YUDEN X5R JMK325BJ226MM CCUK: TAIYO YUDEN X5R EMK316BJ105MF COUT: TAIYO YUDEN X5R JMK325BJ226MM D: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR32-150 L2: SUMIDA CR32-470 Figure 21.
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LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com 9V to -5V Inverting Converter L2 10 PH CCUK L1 10 PH VIN 1 PF VOUT - 5V 9V 1 5 CIN VIN 4 22 PF SHDN SW LM2611A NFB GND RFB1 CFF 29.4k 330 pF D 3 COUT 22 PF RFB2 2 10k CIN: TAIYO YUDEN X5R JMK325BJ226MM CCUK: TAIYO YUDEN X5R EMK316BJ105MF COUT: TAIYO YUDEN X5R JMK325BJ226MM D: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR32-100 L2: SUMIDA CR32-100 Figure 24.
PAGE 13
LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 12V to -5V Inverting Converter CCUK L1 22 PH VIN L2 22 PH 2.2 PF VOUT - 5V 12V 5 CIN 22 PF VIN 4 SHDN LM2611A 1 RFB1 CFF SW 29.4k 1000 pF NFB 3 D COUT 22 PF GND RFB2 2 10k CIN: TAIYO YUDEN X5R JMK325BJ226MM CCUK: TAIYO YUDEN X5R EMK316BJ225ML COUT: TAIYO YUDEN X5R JMK325BJ226MM D: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR32-220 L2: SUMIDA CR32-220 Figure 26.
PAGE 14
LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com CCUK 2.2PF L1A 22PH VOUT-5V 375mA L1B 22PH VIN 12V CIN 22PF CBYP 0.1PF 1 5 VDD 5V SW VIN 4 SHDN LM2611A NFB RFB1 29.4k CFF 1000pF 3 D COUT 22PF GND 2 RFB2 10k CIN: VISHAY/SPRAGUE 595D226X0020C2T CCUK: TAIYO YUDEN X5R EMK316BJ225ML COUT: TAIYO YUDEN X5R JMK325BJ226MM D: ON SEMICONDUCTOR MBR0520 L1: SUMIDA CR32-220 Figure 28.
PAGE 15
LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 VSHDN RSS 100k L1A 22uH VIN CCUK 1uF 1 5 CIN 22uF VIN 4 SHDN CSS 0.1uF RFB1 29.4k SW LM2611A NFB L1B 22uH CFF 1000pF 3 GND VOUT D COUT 22uF RFB2 10k 2 Figure 29. LM2611 Soft Start Circuit Figure 30. Start-Up Waveforms with Soft Start Circuit Figure 31.
PAGE 16
LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com High Duty Cycle/Load Current Operation The circuit in Figure 32 is used for high duty cycles (D > 0.5) and high load currents. The duty cycle will begin to increase beyond 50% as the input voltage drops below the absolute magnitude of the output voltage.
PAGE 17
LM2611 www.ti.com SNOS965I – JUNE 2001 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision H (April 2013) to Revision I • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
PAGE 20
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) LM2611AMF SOT-23 DBV 5 1000 178.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 LM2611AMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM2611AMFX/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2611AMF SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2611AMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2611AMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM2611BMF SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2611BMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2611BMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.
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