Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - DC/DC voltage regulator Holder TSSOP 20 EP

General Description

The MAX5096/MAX5097 easy-to-use, Dual Mode™,

DC-DC converters operate as LDO (low dropout) or

switch-mode buck converters. At a high output load,

the converters operate as high-efficiency pulse-width

modulated (PWM) switch-mode converters and reduce

the power dissipation. The devices switch to a low-

quiescent-current (I

) LDO mode of operation at light

load. During the key-off condition, the system’s microcon-

troller drives the LDO/BUCK input on the fly and forces

the MAX5096/MAX5097 into LDO mode, thereby reduc-

ing the quiescent current significantly.

In Buck mode, the MAX5096/MAX5097 operate from a

5Vto 40V input voltage range and deliver up to 600mA

of load current with excellent load and line regulation.

The fixed-switching frequency versions of 135kHz and

330kHz are available. The MAX5096/MAX5097 DC-DC

internal oscillator can be synchronized to an external

clock. External compensation and a current-mode control

scheme make it easy to design with.

In LDO mode, the MAX5096/MAX5097 operate from a 4V

to 40V input voltage. The LDO mode operation is intended

for a lower output load current of up to 100mA. The quies-

cent current at 100μA load in LDO mode is only 41μA (typ).

The MAX5096/MAX5097 feature an enable input that

shuts down the device, reducing the current consump-

tion to 6μA (typ). Additional features include a power-on-

reset output with a capacitor-adjustable timeout period,

programmable soft-start, output tracking, output overload,

short-circuit, and thermal-shutdown protections.

The MAX5096/MAX5097 operate over the -40°C to +125°C

automotive temperature range and are available in ther-

mally enhanced 20-pin TSSOP or 16-pin TQFN packages.

Applications

● Industrial

Features

● High-Efficiency Switcher Mode (Buck Mode) or Low-

Quiescent-Current Linear Regulator (LDO Mode)

Operation

● Wide Operating Input Voltage Range

• +5V to +40V Buck Mode

• +4V to +40V LDO Mode

● Fixed 3.3V or 5V and Adjustable (1.24V to 11V)

Output Voltage Versions

● 6μA (typ) Shutdown Current

● Fixed 135kHz or 330kHz Switching Frequency

● External Frequency Synchronization

● Programmable Soft-Start

● Integrated Microprocessor-Reset (RESET) Circuit

with Programmable Timeout Period

● Thermal and Short-Circuit Protection

● -40°C to +125°C Automotive Temperature Range

● Thermally Enhanced Package Dissipates

• 2.6W at T

= +70°C (16-Pin TQFN)

• 1.7W at T

= +70°C (20-Pin TSSOP)

19-0603; Rev 3; 5/14

Dual Mode is a trademark of Maxim Integrated Products, Inc.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX5096AATE+ -40°C to +125°C 16 TQFN-EP*

MAX5096BATE+ -40°C to +125°C 16 TQFN-EP*

MAX5096AAUP+ -40°C to +125°C 20 TSSOP-EP*

MAX5096BAUP+ -40°C to +125°C 20 TSSOP-EP*

MAX5097AATE+ -40°C to +125°C 16 TQFN-EP*

MAX5097BATE+ -40°C to +125°C 16 TQFN-EP*

MAX5097AAUP+ -40°C to +125°C 20 TSSOP-EP*

MAX5097BAUP+ -40°C to +125°C 20 TSSOP-EP*

TQFN

15 14 13

5 6 7 8

OUT

ADJ

LDO/BUCK

SGND

RESET

SYNC

COMP

PGND

MAX5096

MAX5097

TOP VIEW

N.C.

ENPGND

TOP VIEW

MAX5096

MAX5097

OUT

ADJ

N.C.BP

138N.C.

129 COMPSYNC

1110 CTSS

SGND

TSSOP

LDO/BUCK

RESET

MAX5096/MAX5097 40V, 600mA Buck Converters with Low-

Quiescent-Current Linear Regulator Mode

Pin Congurations

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (18 pages)

PAGE 1
EVALUATION KIT AVAILABLE 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Ordering Information PART TEMP RANGE MAX5096AATE+ -40°C to +125°C 16 TQFN-EP* MAX5096BATE+ -40°C to +125°C 16 TQFN-EP* -40°C to +125°C 20 TSSOP-EP* MAX5096BAUP+ -40°C to +125°C 20 TSSOP-EP* MAX5097AATE+ -40°C to +125°C 16 TQFN-EP* MAX5097BATE+ -40°C to +125°C 16 TQFN-EP* MAX5097AAUP+ -40°C to +125°C 20 TSSOP-EP* MAX5097BAUP+ -40°C to +125°C 20 TSSOP-EP* +Denotes a lead(Pb)-free/RoHS-co
PAGE 2
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Absolute Maximum Ratings (All voltages referenced to PGND, unless otherwise noted.) IN (transient, 1ms)..................................................-0.3V to +45V SGND....................................................................-0.3V to +0.3V LX...................................................................-1V to (VIN + 0.3V) LX Current.................................................................
PAGE 3
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Electrical Characteristics (continued) (VIN = +14V, IOUT = 1mA, CIN = 100μF, COUT = 22μF, L = 22μH, CBP = 1μF, VEN = +2.4V (Figure 2), SGND = PGND = 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS BUCK MODE Supply Current (Buck Converter On) IS LDO/BUCK = low, VADJ = 1.
PAGE 4
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Electrical Characteristics (continued) (VIN = +14V, IOUT = 1mA, CIN = 100μF, COUT = 22μF, L = 22μH, CBP = 1μF, VEN = +2.4V (Figure 2), SGND = PGND = 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1) PARAMETER Output Voltage ADJ Set Point ADJ Input Bias Current SYMBOL VOUT VADJ IFB MIN TYP MAX UNITS 5V version, MAX5096B/MAX5097B, 5.
PAGE 5
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Electrical Characteristics (continued) (VIN = +14V, IOUT = 1mA, CIN = 100μF, COUT = 22μF, L = 22μH, CBP = 1μF, VEN = +2.4V (Figure 2), SGND = PGND = 0V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1) PARAMETER EN Low-Voltage Threshold SYMBOL VENL EN Input Pulldown CONDITIONS MIN TYP Regulator off VEN = 2V, VLDO/BUCK = 4V MAX UNITS 0.4 V 0.
PAGE 6
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Typical Operating Characteristics (VIN = +14V, VEN = +2.4V, MAX5097AATE+, Figures 2 and 4, TA = +25°C, unless otherwise specified.) 1.5 1.0 0.5 IOUT = 10mA MAX5096 toc02 VEN = 0V VIN = 14V -40 -25 -10 5 20 35 50 65 80 95 110 125 12 10 8 6 4 2 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 710 NO-LOAD SUPPLY CURRENT (µA) IOUT = 100µA 14 MAX5096 toc05 MAX5096 toc06 VOUT = 3.3V VIN = 14V VOUT = 3.
PAGE 7
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Typical Operating Characteristics (continued) (VIN = +14V, VEN = +2.4V, MAX5097AATE+, Figures 2 and 4, TA = +25°C, unless otherwise specified.) LOAD-TRANSIENT RESPONSE (LDO MODE) EFFICIENCY vs. LOAD CURRENT (VOUT = 5V) MAX5096 toc11 MAX5096 toc10 100 90 EFFICIENCY (%) 80 50 40 VIN = 14V VIN = 5.
PAGE 8
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Typical Operating Characteristics (continued) (VIN = +14V, VEN = +2.4V, MAX5097AATE+, Figures 2 and 4, TA = +25°C, unless otherwise specified.
PAGE 9
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Pin Description PIN NAME FUNCTION TQFN TSSOP 1 4 PGND Power Ground. Return path for p-channel power MOSFET driver. Connect the input capacitor return, freewheeling diode anode, and output capacitor return terminals to PGND. 2 5 SGND Signal Ground. Connect SGND to PGND near the input bypass capacitor return terminal. Open-Drain, Active-Low Reset Output.
PAGE 10
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode IN CIN VOUT INTERNAL 4V LDO CURRENT SENSE OSCILLATOR AND RAMP GENERATOR BP CBP - + DC CURRENT LIMITER VIN DC-DC ENABLE PWM PWM COMPARATOR + gm - CP + - SYNCRO SYNC CC MODE SELECTOR LDO/BUCK LDO/BUCK SELECTOR FB CSS MAX5096 MAX5097 VOUT COUT SS VREF + R1 ADJ - FB OUT + SS VREF FEEDBACK SELECTOR LDO MODE AMPLIFIER R2 0.12V RPU EN SS L LX BUCK MODE GM AMPLIFIER COMP RC 0.
PAGE 11
MAX5096/MAX5097 Detailed Description The MAX5096/MAX5097 are easy-to-use, high-efficiency, PWM current-mode, step-down switching converters in normal operation. The MAX5096/MAX5097 have an internal high-side p-channel 0.9Ω switch and use a low forward-drop freewheeling diode for rectification. In buck mode, the p-channel switches at the 135kHz or 330kHz frequency.
PAGE 12
MAX5096/MAX5097 VIN 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode VIN CIN 100µF BP EN 22µH LDO/BUCK LX SYNC CP 22pF COMP RC 100kΩ 1.0µF MAX5096 MAX5097 + D1* COUT B260/ 22µF MURS105 (CER.) VOUT ADJ CC 1.2nF OUT 100kΩ SS CSS 0.047µF CT CCT 0.01µF RESET RESET GND PGND *USE MURS105 IN APPLICATIONS WHERE LDO MODE QUIESCENT CURRENT IS CRITICAL. Figure 2.
PAGE 13
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Applications Information VOUT3 Output Voltage Selection VOUT2 VOUT1 SOFT-START STOP RATIOMETRIC TRACKING OUTPUTS VOUT1 VOUT2 VOUT3 STOP SOFT-START SEQUENCED OUTPUTS Figure 3. Output Voltage Tracking/Sequencing lower end of the AM band. The MAX5096 is suitable for noise-sensitive applications like AM radio power supply.
PAGE 14
MAX5096/MAX5097 5V TO 40V VIN 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode VIN CIN 100µF BP 22µH LDO/BUCK LX SYNC COMP CP 1.0µF EN RC MAX5096 MAX5097 D1* COUT B260/ MURS105 22µF + VOUT R1 ADJ R2 CC OUT RPU SS CSS CT RESET RESET GND *USE MURS105 IN APPLICATIONS WHERE LDO MODE QUIESCENT CURRENT IS CRITICAL. PGND CCT Figure 4. Adjustable Output Voltage Configuration use typical values of VIN and fSW so that efficiency is optimum for typical conditions.
PAGE 15
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode ripple is mainly composed of ΔVQ (caused by the capacitor discharge) and ΔVESR (caused by the voltage drop across the ESR of the output capacitor). Normally, a good approximation of the output-voltage ripple is ΔVRIPPLE ≈ ΔVESR + ΔVQ. If using ceramic capacitors, assume the contribution to the output-voltage ripple from the ESR and the capacitor discharge to be equal to 20% and 80%, respectively.
PAGE 16
MAX5096/MAX5097 Compensation Network The MAX5096/MAX5097 in LDO mode are compensated internally with a compensation network around the LDO error amplifier. When in buck mode, the DC-DC gM amplifier must be externally compensated using a network connected from COMP to ground. The current-mode control architecture reduces the compensation network to a single pole-zero. The RC and C network, connected from the internal transconductance amplifier output to SGND, can provide a single pole-zero pair.
PAGE 17
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode 3) Connect the exposed pad of the IC to the SGND plane. Do not make a direct connection between the exposed pad plane and SGND (pin 2) under the IC. Connect the exposed pad and pin 2 to the SGND plane separately. Connect the ground connection of the feedback resistive divider, the soft-start capacitor, the adjustable reset timeout capacitor, and the compensation network to the SGND plane.
PAGE 18
MAX5096/MAX5097 40V, 600mA Buck Converters with LowQuiescent-Current Linear Regulator Mode Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 7/06 Initial release 1 6/07 Updated Electrical Characteristics table 2 9/07 Removed future product asterisks from Ordering Information table, Updated Electrical Characteristics table and TSSOP package outline 3 5/14 No /V OPNs; removed automotive reference from Applications section DESCRIPTION — 1, 2, 3, 5, 20 1, 4, 18, 19, 20 1 For pric