Rainbow Electronics MAX1545 User Manual

General Description

The MAX1519/MAX1545 are dual-phase, Quick-PWM™, step-down controllers for desktop and mobile Pentium®4 (P4) CPU core supplies. Dual-phase operation reduces input ripple current requirements and output voltage ripple while easing component selection and layout difficulties. The Quick-PWM control scheme provides instantaneous response to fast load-current steps. The MAX1519/MAX1545 include active voltage positioning with adjustable gain and offset, reducing power dissipation and bulk output capacitance requirements.

The MAX1519/MAX1545 are intended for two different notebook CPU core applications: stepping down the battery directly or stepping down the 5V system supply to create the core voltage. The single-stage conversion method allows these devices to directly step down highvoltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the 5V system supply instead of the battery) at a higher switching frequency provides the minimum possible physical size.

The MAX1519/MAX1545 comply with Intel’s P4 specifications. The switching regulator features soft-start, power-up sequencing, and soft-shutdown. The MAX1519/MAX1545 also feature independent four-level logic inputs for setting the suspend voltage (S0–S1).

The MAX1519/MAX1545 include output undervoltage protection (UVP), thermal protection, and voltage regulator power-OK (VROK) output. When any of these protection features detect a fault, the controller shuts down. Additionally, the MAX1519/MAX1545 include overvoltage protection.

The MAX1519/MAX1545 are available in low-profile, 40pin, 6mm x 6mm thin QFN packages. For other CPU platforms, refer to the pin-to-pin compatible MAX1544 and MAX1532/MAX1546/MAX1547 data sheets.

Applications

Desktop and Mobile P4 Computers

Multiphase CPU Core Supply

Voltage-Positioned Step-Down Converters

Servers/Desktop Computers

Low-Voltage, Digitally Programmable Power Supplies

Features

♦ Dual-Phase, Quick-PWM Controllers

♦ ±0.75% V

OUT

Accuracy Over Line, Load, and

Temperature (1.3V)

♦ Active Voltage Positioning with Adjustable Gain

and Offset

♦ 5-Bit On-Board DAC

Mobile: 0.60V to 1.75V Output Range Desktop: 1.10V to 1.85V Output Range

♦ Selectable 100kHz/200kHz/300kHz/550kHz

Switching Frequency

♦ 4V to 28V Battery Input Voltage Range

♦ Adjustable Slew-Rate Control

♦ Drive Large Synchronous Rectifier MOSFETs

♦ Output Overvoltage Protection (MAX1545 Only)

♦ Undervoltage and Thermal-Fault Protection

♦ Power Sequencing and Timing

♦ Selectable Suspend Voltage (0.675V to 1.45V)

♦ Soft-Shutdown

♦ Selectable Single- or Dual-Phase Pulse Skipping

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

19-2734; Rev 1; 9/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

Pentium is a registered trademark of Intel Corp.

PART TEMP RANGE PIN-PACKAGE

MAX1519ETL -40°C to +100°C 40 Thin QFN 6mm

MAX1545ETL -40°C to +100°C 40 Thin QFN 6mm ✕ 6mm

✕ 6mm

TOP VIEW

TIME

TON SUS

S0 S1

SHDN

OFS

REF

ILIM

V

CC

10

CSN

CMN

CMPV+BSTS

CSP

403938373635343332

1

2

3

4

5

6

7

8

9

MAX1519 MAX1545

111213141516171819

CCI

CCV

GND

GNDS

THIN QFN

LXS

DHS

DLS

PGND

31

30

V

DD

29

DLM

28

DHM

27

LXM BSTM

26

VROK

25

D0

24

D1

23

D2

22

D3

21

20

FB

OAIN-

OAIN+

SKIP

CODE

D4

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

V+ to GND ..............................................................-0.3V to +30V

V

CC

to GND..............................................................-0.3V to +6V

V

DD

to PGND............................................................-0.3V to +6V

SKIP, SUS, D0–D4 to GND.......................................-0.3V to +6V

ILIM, FB, OFS, CCV, CCI, REF, OAIN+,

OAIN- to GND.........................................-0.3V to (V

CC

+ 0.3V)

CMP, CSP, CMN, CSN, GNDS to GND ......-0.3V to (V

CC

+ 0.3V)

TON, TIME, VROK, S0–S1, CODE to GND.-0.3V to (V

CC

+ 0.3V)

SHDN to GND (Note 1)...........................................-0.3V to +18V

DLM, DLS to PGND....................................-0.3V to (V

DD

+ 0.3V)

BSTM, BSTS to GND ..............................................-0.3V to +36V

DHM to LXM ...........................................-0.3V to (V

BSTM

+ 0.3V)

LXM to BSTM............................................................-6V to +0.3V

DHS to LXS..............................................-0.3V to (V

BSTS

+ 0.3V)

LXS to BSTS .............................................................-6V to +0.3V

GND to PGND .......................................................-0.3V to +0.3V

REF Short-Circuit Duration .........................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

40-Pin 6mm

✕ 6mm Thin QFN

(derate 23.2mW/°C above +70°C)...............................1.860W

Operating Temperature Range .........................-40°C to +100°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= 0°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)

Note 1: SHDN may be forced to 12V for the purpose of debugging prototype boards using the no-fault test mode, which disables

fault protection and overlapping operation.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

PWM CONTROLLER

Input Voltage Range

DC Output Voltage Accuracy (Note 2)

Line Regulation Error VCC = 4.5V to 5.5V, V+ = 4.5V to 28V 5 mV

IFB, I

Input Bias Current

I

OFS

GNDS

OFS Input Range 02V

OFS Gain A

OFS

GNDS Input Range -20 +200 mV

GNDS Gain A

TIME Frequency Accuracy f

GNDS

TIME

Battery voltage, V+ 4 28

V

, V

CC

DD

V+ = 4.5V to 28V, includes load regulation error

DAC codes ≥ 1V -10 +10

DAC codes from

0.60V to 1V

4.5 5.5

-15 +15

FB, GNDS -2 +2

OFS -0.1 +0.1

∆V

/∆V

OUT

OFS

OUT

OFS

OUT

= V

/∆V

= V

/∆V

OFS;

GNDS

OFS, VOFS

- V

OFS

REF, VOFS

∆V

∆V ∆V

∆V

1000kHz nominal, R

500kHz nominal, R

250kHz nominal, R

Shutdown, R

= 30kΩ 125

TIME

= 0 to 1V

= 1V to 2V

= 15kΩ 900 1000 1100

TIME

= 30kΩ 460 500 540

TIME

= 60kΩ 225 250 275

TIME

-0.129 -0.125 -0.117

0.97 0.99 1.01 V/V

mV

µA

V/V

kHz

V

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= 0°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)

)

On-Time (Note 3) t

Minimum Off-Time (Note 3) t

BIAS AND REFERENCE

Quiescent Supply Current (VCC)I

Quiescent Supply Current (VDD)I

Quiescent Battery Supply Current (V+)

Shutdown Supply Current (VCC) Measured at VCC, SHDN = GND 4 10 µA

Shutdown Supply Current (VDD) Measured at VDD, SHDN = GND <1 5 µA

Shutdown Battery Supply Current (V+)

Reference Voltage V Reference Load Regulation ∆V

FAULT PROTECTION

Output Overvoltage Protection Threshold (MAX1545 Only)

Output Overvoltage Propagation Delay (MAX1545 Only)

Output Undervoltage Protection Threshold

Output Undervoltage Propagation Delay

VROK Threshold

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ON

OFF(MIN

CC

DD

I

V+

REF

V

OVP

t

OVP

V

UVP

t

UVP

V+ = 12V, V

FB

TON = GND 300 375

TON = VCC, open, or REF 400 480

Measured at VCC, FB forced above the regulation point, OAIN- = FB, V

OAIN+

Measured at VDD, FB forced above the regulation point

Measured at V+ 25 40 µA

Measured at V+, SHDN = GND, V

CC

V

CC

I

REF

SKIP = VCC, measured at FB with respect to unloaded output voltage

SKIP = REF or GND 2.00 V

FB forced 2% above trip threshold 10 µs

Measured at FB with respect to unloaded output voltage

FB forced 2% below trip threshold 10 µs

Measured at FB with respect to unloaded output voltage

= V

CCI

= 1.3V

= VDD = 0 or 5V

= 4.5V to 5.5V, I

= -10µA to +100µA -10 +10 mV

= 1.2V

TON = GND (550kHz)

TON = REF (300kHz)

TON = open (200kHz)

TON = V (100kHz)

= 0 1.990 2.000 2.010 V

REF

Lower threshold

(undervoltage)

Upper threshold

(overvoltage)

SKIP = V

CC

155 180 205

320 355 390

475 525 575

920 1000 1140

13 16 19 %

67 70 73 %

-12 -10 -8

+8 +10 +12

1.70 3.20 mA

<1 5 µA

ns

%

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= 0°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Undervoltage Fault and VROK Transition Blanking Time

t

BLANK

(Note 4)

VROK Startup Delay

Measured from the time when FB reaches the voltage set by the DAC code; clock speed set by R

TIME

Measured from the time when FB first reaches the voltage set by the DAC code after startup

357ms

24 Clks

VROK Delay t

VROK

VROK Output Low Voltage I

FB forced 2% outside the VROK trip threshold

= 3mA 0.4 V

SINK

10 µs

VROK Leakage Current High state, VROK forced to 5.5V 1 µA

VCC Undervoltage Lockout Threshold

Thermal-Shutdown Threshold T

V

UVLO(VCC

SHDN

Rising edge, hysteresis = 90mV, PWM disabled below this level

4.0 4.25 4.4 V

Hysteresis = 10°C 160 °C

CURRENT LIMIT AND BALANCE

Current-Limit Threshold Voltage (Positive, Default)

Current-Limit Threshold Voltage (Positive, Adjustable)

Current-Limit Threshold Voltage (Negative)

V

LIMIT(NEG

Current-Limit Threshold Voltage (Zero Crossing)

CMP, CMN, CSP, CSN Input Ranges

CMP, CMN, CSP, CSN Input Current

Secondary Driver-Disable Threshold

ILIM Input Current I

Current-Limit Default Switchover Threshold

V

ZERO

V

LIMIT

CSP

ILIM

CMP - CMN, CSP - CSN; ILIM = V

CMP - CMN, CSP - CSN

V

CC

= 0.2V 8 10 12

ILIM

= 1.5V 73 75 77

ILIM

CMP - CMN, CSP - CSN; ILIM = VCC, SKIP = V

CC

28 30 32 mV

-41 -36 -31 mV

CMP - CMN, CSP - CSN; SKIP = GND 1.5 mV

02V

V

= V

= 0 to 5V -2 +2 µA

CSN

V

3VCC - 1

CC

0.4

= 0 to 5V 0.1 200 nA

V

3VCC - 1

CC

0.4

V

CSP

ILIM

mV

V

(V

- V

Current-Balance Offset V

Current-Balance Transconductance

OS(IBAL

G

m(IBAL

CMP

-20mV < (V

1.0V < V

CCI

CMN

CMP

< 2.0V

) - (V

- V

CSP

CMN

- V

CSN

) < 20mV,

); I

CCI

= 0,

-2 +2 mV

400 µS

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= 0°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GATE DRIVERS

DH_ Gate-Driver On-Resistance R

DL_ Gate-Driver On-Resistance R

DH_ Gate-Driver Source/Sink Current

DL_ Gate-Driver Sink Current I

DL_ Gate-Driver Source Current I

Dead Time t

ON(DH)

ON(DL)

I

DH

DL(SINK

DL(SOURCE

DEAD

VOLTAGE-POSITIONING AMPLIFIER

Input Offset Voltage V

Input Bias Current I

Op Amp Disable Threshold V

Common-Mode Input Voltage Range

OS

BIAS

OAIN-

V

CM

Common-Mode Rejection Ratio CMRR V

Power-Supply Rejection Ratio PSRR VCC = 4.5V to 5.5V 75 100 dB

Large-Signal Voltage Gain A

OA

Output Voltage Swing

Input Capacitance 11 pF

Gain-Bandwidth Product 3 MHz

Slew Rate 0.3 V/µs

Capacitive-Load Stability No sustained oscillations 400 pF

LOGIC AND I/O

SHDN Input High Voltage V SHDN Input Low Voltage V SHDN No-Fault Threshold V

IH

IL

SHDN

Three-Level Input Logic Levels SUS, SKIP

Logic Input Current SHDN, SUS, SKIP -1 +1 µA

D0–D4 Logic Input High Voltage 1.6 V

D0–D4 Logic Input Low Voltage 0.8 V

BST_ - LX_ forced to 5V 1.0 4.5 Ω

High state (pullup) 1.0 4.5

Low start (pulldown) 0.4 2

DH_ forced to 2.5V, BST_ - LX_ forced to 5V

1.6 A

DL_ forced to 5V 4 A

DL_ forced to 2.5V 1.6 A

DL_ rising 35

DH_ rising 26

-1 +1 mV

OAIN+, OAIN- 0.1 200 nA

V

3VCC - 1

CC

0.4

Guaranteed by CMRR test 0 2.5 V

OAIN+

= V

= 0 to 2.5V 70 115 dB

OAIN-

RL = 1kΩ to VCC/2 80 112 dB

|V

- V

OAIN+

R

= 1kΩ to VCC/2

L

OAIN-

| ≥ 10mV,

VCC - V

V

FBL

FBH

77 300

47 200

0.8 V

0.4 V

12 15 V

High 2.7

REF 1.2 2.3

Low 0.8

-

mV

Ω

ns

V

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= 0°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.)

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= -40°C to +100°C, unless otherwise specified.) (Note 5)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

D0–D4 Input Current D0–D4 -2 +2 µA

CODE Input High Voltage 2.4 V

CODE Input Low Voltage 0.8 V

CODE Input Current -1 +1 µA

Four-Level Input Logic Levels TON, S0–S1

Four-Level Input Current TON, S0–S1 forced to GND or V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

PWM CONTROLLER

Input Voltage Range

DC Output Voltage Accuracy (Note 2)

OFS Input Range 02V

OFS Gain A

GNDS Gain A

On-Time (Note 3) t

Minimum Off-Time (Note 3) t

OFS

GNDS

TIME

ON

OFF(MIN

High

V

-

CC

0.4

Open 3.15 3.85

REF 1.65 2.35

Low 0.4

-3 +3 µA

CC

Battery voltage, V+ 4 28

, V

V

CC

DD

V+ = 4.5V to 28V, includes load regulation error

∆V

/∆V

OUT

OFS

OUT

OFS

OUT

OFS;

= V

OFS, VOFS

/∆V

OFS;

= V

OFS

/∆V

GNDS

- V

REF, VOFS

∆V

∆V ∆V

∆V

1000kHz nominal, R

500kHz nominal, R

250kHz nominal, R

V+ = 12V, V

= V

CCI

= 1.2V

FB

DAC codes ≥ 1V -13 +13

DAC codes from

0.60V to 1V

= 0 to 1V

= 1V to 2V

= 15kΩ 880 1120

TIME

= 30kΩ 450 550TIME Frequency Accuracy f

TIME

= 60kΩ 220 280

TIME

TON = GND (550kHz)

TON = REF (300kHz)

TON = open (200kHz)

TON = V

CC

(100kHz)

4.5 5.5

-20 +20

-0.131 -0.115

0.94 1.01 V/V

150 210

315 395

470 580

910 1150

TON = GND 380

TON = VCC, open, or REF 490

mV

V/V

kHz

ns

V

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

_______________________________________________________________________________________ 7

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= -40°C to +100°C, unless otherwise specified.) (Note 5)

)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BIAS AND REFERENCE

Quiescent Supply Current (VCC)I

Quiescent Supply Current (VDD)I

Quiescent Battery Supply Current (V+)

I

CC

DD

V+

Shutdown Supply Current (VCC) Measured at VCC, SHDN = GND 20 µA

Shutdown Supply Current (VDD) Measured at VDD, SHDN = GND 20 µA

Shutdown Battery Supply Current (V+)

Reference Voltage V

REF

FAULT PROTECTION

Output Overvoltage Protection Threshold (MAX1545 Only)

Output Undervoltage Protection Threshold

V

OVP

UVP

VROK Threshold

Measured at VCC, FB forced above the regulation point, OAIN- = FB,

= 1.3V

V

OAIN+

Measured at VDD, FB forced above the regulation point

3.2 mA

20 µA

Measured at V+ 50 µA

Measured at V+, SHDN = GND, V

= VDD = 0 or 5V

CC

VCC = 4.5V to 5.5V, I

= 0 1.985 2.015 V

REF

SKIP = VCC, measured at FB with respect to unloaded output voltage

Measured at FB with respect to unloaded output voltage

Lower threshold

Measured at FB with respect to unloaded output voltage

(undervoltage)

Upper threshold (overvoltage) SKIP = V

CC

13 19 %

67 73 %

-13 -7

+7 +13

20 µA

%

VROK Startup Delay

VCC Undervoltage Lockout Threshold

CURRENT LIMIT AND BALANCE

Current-Limit Threshold Voltage (Positive, Default)

Current-Limit Threshold Voltage (Positive, Adjustable)

Current-Limit Threshold Voltage (Negative)

Current-Balance Offset V

V

UVLO(VCC

V

LIMIT

V

LIMIT

V

LIMIT(NEG

OS(IBAL

Measured from the time when FB first reaches the voltage set by the DAC code after startup

Rising edge, hysteresis = 90mV, PWM disabled below this level

CMP - CMN, CSP - CSN; ILIM = V

V

ILIM

CMP - CMN, CSP - CSN

CC

= 0.2V 7 13

= 1.5V 72 78

CMP - CMN, CSP - CSN; ILIM = VCC, SKIP = V

(V

-20mV < (V

1.0V < V

CMP

- V

CC

CMN

CCI

) - (V

CMP

< 2.0V

- V

CSP

CMN

- V

CSN

) < 20mV,

); I

CCI

= 0,

3ms

3.90 4.45 V

27 33 mV

mV

-30 -42 mV

-3 +3 mV

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

8 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, VCC= VDD= V

SHDN

= V

TON

= V

SKIP

= VS0= VS1= V

CODE

= 5V, VFB= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; TA= -40°C to +100°C, unless otherwise specified.) (Note 5)

)

Note 2: DC output accuracy specifications refer to the trip level of the error amplifier. When pulse skipping, the output slightly rises

(< 0.5%) when transitioning from continuous conduction to no load.

Note 3: On-time and minimum off-time specifications are measured from 50% to 50% at the DHM and DHS pins, with LX_ forced to

GND, BST_ forced to 5V, and a 500pF capacitor from DH_ to LX_ to simulate external MOSFET gate capacitance. Actual incircuit times may be different due to MOSFET switching speeds.

Note 4: The output fault-blanking time is measured from the time when FB reaches the regulation voltage set by the DAC code.

During normal operation (SUS = GND), regulation voltage is set by the VID DAC inputs (D0–D4). During suspend mode (SUS = REF or high), the regulation voltage is set by the suspend DAC inputs (S0–S1).

Note 5: Specifications to T

A

= -40°C and +100°C are guaranteed by design and are not production tested.

GATE DRIVERS

DH_ Gate-Driver On-Resistance R

DL_ Gate-Driver On-Resistance R

VOLTAGE-POSITIONING AMPLIFIER

Input Offset Voltage V

Common-Mode Input Voltage Range

Output Voltage Swing

LOGIC AND I/O

SHDN Input High Voltage V SHDN Input Low Voltage V

D0–D4 Logic Input High Voltage 1.6 V

D0–D4 Logic Input Low Voltage 0.8 V

CODE Input High Voltage 2.4 V

CODE Input Low Voltage 0.8 V

Four-Level Input Logic Levels TON, S0–S1

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ON(DH

ON(DL)

OS

V

CM

IH

IL

BST_ - LX_ forced to 5V 4.5 Ω

High state (pullup) 4.5

Low start (pulldown) 2

Guaranteed by CMRR test 0 2.5 V

|V

OAIN+

R

L

= 1kΩ to VCC/2

- V

OAIN-

| ≥ 10mV,

VCC - V

V

High 2.7 REF 1.2 2.3Three-Level Input Logic Levels SUS, SKIP

Low 0.8

High

Open 3.15 3.85

REF 1.65 2.35

Low 0.4

FBL

FBH

-2.0 +2.0 mV

0.8 V

-

V

CC

0.4

300

200

0.4 V

Ω

mV

V

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

_______________________________________________________________________________________ 9

)

Typical Operating Characteristics

(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 set for 1V (SUS = V

CC

), OFS = GND, TA= +25°C, unless otherwise specified.)

100

90

80

50

0.1 10 100

70

60

LOAD CURRENT (A)

EFFICIENCY (%)

1

EFFICIENCY vs. LOAD CURRENT

(V

OUT

= 1.00V)

MAX1519 toc04

VIN = 20V

VIN = 12V

VIN = 8V

SKIP = REF SKIP = V

CC

OUTPUT VOLTAGE vs. LOAD CURRENT

(V

OUT

= 0.80V)

MAX1519 toc05

LOAD CURRENT (A)

OUTPUT VOLTAGE (V)

30

SUS = V

CC

10 20

0.74

0.76

0.78

0.80

0.82

0.72 040

100

90

80

50

0.1 10 100

70

60

LOAD CURRENT (A)

EFFICIENCY (%)

1

DUAL-PHASE EFFICIENCY vs. LOAD CURRENT

(V

OUT

= 0.80V)

MAX1519 toc06

VIN = 20V

VIN = 8V

VIN = 12V

SKIP = REF

100

90

80

50

0.1 10 100

70

60

LOAD CURRENT (A)

EFFICIENCY (%)

1

SINGLE-PHASE EFFICIENCY

vs. LOAD CURRENT

(V

OUT

= 0.80V)

MAX1519 toc07

VIN = 20V

VIN = 8V

V

IN

= 12V

SKIP = GND

SWITCHING FREQUENCY

vs. LOAD CURRENT

MAX1532toc08

LOAD CURRENT (A)

SWITCHING FREQUENCY (kHz)

3010 20

100

200

300

400

0

040

V

OUT

= 1V (NO LOAD)

SKIP MODE (SKIP = REF)

FORCED-PWM (SKIP = VCC)

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE (FORCED-PWM MODE)

MAX1519 toc09

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

20 255 1510

30

60

90

120

150

0

030

I

IN

SKIP = V

CC

ICC + I

DD

OUTPUT VOLTAGE vs. LOAD CURRENT

1.52

1.50

1.48

1.46

1.44

OUTPUT VOLTAGE (V)

1.42

1.40

1.38 060

(V

= 1.50V)

OUT

LOAD CURRENT (A)

MAX1519 toc01

EFFICIENCY (%)

40 503010 20

EFFICIENCY vs. LOAD CURRENT

= 1.50V)

(V

100

90

80

70

60

50

0.1 1 10 100

OUT

VIN = 8V

VIN = 12V

VIN = 20V

SKIP = REF SKIP = V

LOAD CURRENT (A)

OUTPUT VOLTAGE vs. LOAD CURRENT

= 1.00V)

(V

1.02

1.00

MAX1519 toc02

0.98

0.96

0.94

OUTPUT VOLTAGE (V)

0.92

CC

0.90 060

OUT

5010 3020 40

LOAD CURRENT (A

MAX1519 toc03

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 set for 1V (SUS = V

CC

), OFS = GND, TA= +25°C, unless otherwise specified.)

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

10 ______________________________________________________________________________________

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE (PULSE SKIPPING)

3.0 SKIP = REF

2.5

2.0

1.5

1.0

SUPPLY CURRENT (mA)

0.5

0

030

CURRENT-BALANCE OFFSET

50

SAMPLE SIZE = 100

40

30

20

SAMPLE PERCENTAGE (%)

10

0

-2.50 2.50

OUTPUT OFFSET VOLTAGE

vs. OFS VOLTAGE

150

100

MAX1519 toc10

50

ICC + I

DD

IIN

20 255 1510

INPUT VOLTAGE (V)

0

-50

OUTPUT OFFSET VOLTAGE (mV)

-100

-150

02.0 OFS VOLTAGE (V)

CURRENT-LIMIT THRESHOLD

VOLTAGE DISTRIBUTION

0

1.25-1.25

OFFSET VOLTAGE (mV)

50

MAX1519 toc13

40

30

20

SAMPLE PERCENTAGE (%)

10

0

9.0 11.0

V

ILIM

SAMPLE SIZE = 100

DISTRIBUTION

= 0.20V

10.0

CURRENT LIMIT (mV)

UNDEFINED REGION

1.50.5 1.0

10.59.5

50

SAMPLE SIZE = 100

MAX1519 toc11

40

30

20

SAMPLE PERCENTAGE (%)

10

0

1.990 2.010

60

50

MAX1519 toc14

40

30

20

10

GAIN (dB)

0

-10

-20

-30

-40

0.1 10 100 10001 10,000

REFERENCE VOLTAGE

DISTRIBUTION

2.000

REFERENCE VOLTAGE (V)

2.0051.995

VOLTAGE-POSITIONING AMPLIFIER

GAIN AND PHASE vs. FREQUENCY

GAIN

PHASE

FREQUENCY (kHz)

MAX1519 toc15

MAX1519 toc12

180

144

108

72

36

0

-36

-72

-108

-144

-180

PHASE (DEGREES)

VPS AMPLIFIER OFFSET VOLTAGE

vs. COMMON-MODE VOLTAGE

180

160

140

120

100

80

60

OFFSET VOLTAGE (µV)

40

20

0

1 205

COMMON-MODE VOLTAGE (V)

VPS AMPLIFIER

DISABLED

34

MAX1519 toc16

INDUCTOR CURRENT DIFFERENCE

vs. LOAD CURRENT

1.0

0.8

(A)

0.6

L(CM)

- I

0.4

L(CS)

I

0.2

0

SKIP = REF

SKIP = V

CC

R

= 1mΩ

SENSE

10

050

20

30 40

LOAD CURRENT (A)

MAX1519 toc17

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 set for 1V (SUS = V

CC

), OFS = GND, TA= +25°C, unless otherwise specified.)

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

______________________________________________________________________________________ 11

5V

0V

2V

1V

0V

5V

0V

A. SHDN, 5V/div B. 1.5V OUTPUT, 1V/div C. VROK, 5V/div R

= 64.9k

TIME

5V

0V

1.5V

0V

10A

0A

A. SHDN, 5V/div B. 1.5V OUTPUT, 1V/div

, 10A/div

C. I

L1

, 10A/div

D. I

L2

= 75mΩ, R

R

LOAD

POWER-UP SEQUENCE

1ms/div

Ω

SOFT-SHUTDOWN

200µs/div

= 64.9k

TIME

MAX1519 toc18

A

B

C

MAX1519 toc20

A

B

C

D

Ω

SOFT-START

5V

0V

1.5V

0V

10A

0A

100µs/div

A. SHDN, 5V/div B. 1.5V OUTPUT, 1V/div C. I

, 10A/div

L1

, 10A/div

D. I R

LOAD

L2

= 75mΩ, R

TIME

= 64.9k

Ω

1.50V LOAD TRANSIENT (10A TO 50A LOAD)

50A

10A

1.5V

20A

0A

20µs/div

A. LOAD CURRENT, (I B. OUTPUT VOLTAGE (1.5V NO LOAD), 100mV/div

, 10A/div

C. I

L1

, 10A/div

D. I

L2

= 10A TO 50A), 50A/div

LOAD

MAX1519 toc19

A

B

C

D

MAX1519 toc21

A

B

C

D

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 set for 1V (SUS = V

CC

), OFS = GND, TA= +25°C, unless otherwise specified.)

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

12 ______________________________________________________________________________________

30A

10A

1.00V LOAD TRANSIENT (10A TO 30A LOAD)

MAX1519 toc22

A

0.2V

OFFSET TRANSITION

0V

MAX1519 toc23

A

1.0V

10A

0A

10A

0A

20µs/div

A. LOAD CURRENT, (I B. OUTPUT VOLTAGE (1.00V NO LOAD), 50mV/div

, 10A/div

C. I

L1

, 10A/div

D. I

L2

= 10A TO 30A), 25A/div

LOAD

SUSPEND TRANSITION

(DUAL-PHASE PWM OPERATION)

3.3V 0V

1.5V

1.0V

2.5A

40µs/div

A. SUS, 5V/div B. V

= 1.5V TO 1.0V, 0.5V/div

OUT

, 10A/div

C. I

L1

, 10A/div

D. I

L2

5A LOAD, SKIP = V

, R

CC

TIME

= 64.9k

MAX1519 toc24

Ω

B

C

D

1.5V

5A

A. V

OFS

B. V

OUT

C. I

L1

D. I

L2

10A LOAD

20µs/div

= 0 TO 200mV, 0.2V/div

= 1.500V TO 1.475V, 20mV/div , 10A/div , 10A/div

B

C

D

SUSPEND TRANSITION

(SINGLE-PHASE SKIP OPERATION)

A

B

C

D

3.3V 0V

1.5V

1.0V

10A

0A

10A

0A

A. SUS, 5V/div B. V

= 1.5V TO 1.0V, 0.5V/div

OUT

, 10A/div

C. I

L1

, 10A/div

D. I

L2

5A LOAD, C

OUT

100µs/div

= (4) 680µF, SKIP = SUS, R

MAX1519 toc25

TIME

A

B

C

D

= 64.9k

Ω

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN= 12V, VCC= VDD= 5V, SHDN = SKIP = VCC, D0–D4 set for 1.5V (SUS = GND), S0–S1 set for 1V (SUS = V

CC

), OFS = GND, TA= +25°C, unless otherwise specified.)

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

______________________________________________________________________________________ 13

1.5V

SINGLE-PHASE SKIP TO DUAL-PHASE

PWM TRANSITION

5V

0A

, 10A/div

L1

, 10A/div

L2

TO GND, 5V/div

CC

A. SKIP = V B. 1.5V OUTPUT, 50mV/div C. I D. I 2A LOAD

20µs/div

MAX1519 toc26

A

B

C

D

DUAL-PHASE SKIP TO DUAL-PHASE

PWM TRANSITION

5V 2V

1.5V

0A

20µs/div

A. SKIP = V B. 1.5V OUTPUT, 50mV/div C. I D. I 2A LOAD

, 10A/div

L1

, 10A/div

L2

TO REF, 5V/div

CC

MAX1519 toc27

A

B

C

D

100mV DAC CODE TRANSITION

3.3V

0V

1.5V

1.4V

5A

A. D1, 5V/div B. V

= 1.50V TO 1.40V, 100mV/div

OUT

, 10A/div

C. I

L1

, 10A/div

D. I

L2

10A LOAD

20µs/div

MAX1519 toc28

400mV DAC CODE TRANSITION

A

B

C

D

3.3V

0V

1.5V

1.1V

5A

A. D3, 5V/div B. V

= 1.50V TO 1.10V, 0.5V/div

OUT

, 10A/div

C. I

L1

, 10A/div

D. I

L2

10A LOAD

40µs/div

MAX1519 toc29

A

B

C

D