max5083atet Maxim Integrated Products, Inc., max5083atet Datasheet

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max5083atet

Manufacturer Part Number
max5083atet
Description
1.5a, 40v, Maxpower Step-down Dc-dc Converters
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX5083ATET.pdf (18 pages)
The MAX5082/MAX5083 are 250kHz PWM step-down
DC-DC converters with an on-chip, 0.3Ω high-side
switch. The input voltage range is 4.5V to 40V for the
MAX5082 and 7.5V to 40V for the MAX5083. The output
is adjustable from 1.23V to 32V and can deliver up to
1.5A of load current.
Both devices utilize a voltage-mode control scheme for
good noise immunity in the high-voltage switching envi-
ronment and offer external compensation allowing for
maximum flexibility with a wide selection of inductor val-
ues and capacitor types. The switching frequency is
internally fixed at 250kHz and can be synchronized to
an external clock signal through the SYNC input. Light
load efficiency is improved by automatically switching
to a pulse-skip mode.
All devices include programmable undervoltage lock-
out and soft-start. Protection features include cycle-by-
cycle current limit, hiccup-mode output short-circuit
protection, and thermal shutdown. Both devices are
available in a space-saving, high-power (2.7W), 16-pin
TQFN package and are rated for operation over the
-40°C to +125°C temperature range.
19-3657; Rev 0; 5/05
FireWire is a registered trademark of Apple Computer, Inc.
Typical Operating Circuits continued at end of data sheet.
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.
FireWire
Distributed Power
4.5V TO 40V
PGND
®
V
IN
Power Supplies
________________________________________________________________ Maxim Integrated Products
C1
R1
R2
General Description
C2
Applications
ON/OFF
REG
1.5A, 40V, MAXPower Step-Down
SYNC SGND PGND
IN
Automotive
Industrial
DVREG
MAX5082
C-
C
F
C+
SS
♦ 4.5V to 40V (MAX5082) or 7.5V to 40V (MAX5083)
♦ 1.5A Output Current
♦ V
♦ Internal High-Side Switch
♦ Fixed 250kHz Internal Oscillator
♦ Automatic Switchover to Pulse-Skip Mode at
♦ External Frequency Synchronization
♦ Thermal Shutdown and Short-Circuit Protection
♦ Operates Over the -40°C to +125°C Temperature
♦ Space-Saving (5mm x 5mm) High-Power 16-Pin
*EP = Exposed pad.
Pin Configurations appear at end of data sheet.
C
MAX5082ATE
MAX5083ATE
Input Voltage Range
Light Loads
Range
TQFN Package
D1
SS
OUT
BST
COMP
PART
Range From 1.23V to 32V
LX
FB
DC-DC Converters
Typical Operating Circuits
D2
C
BST
-40°C to +125°C
-40°C to +125°C
L1
TEMP RANGE
Ordering Information
C8
R5
C5
C7
R6
C6
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
Features
R3
R4
V
PGND
OUT
1

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max5083atet Summary of contents

Page 1

Rev 0; 5/05 General Description The MAX5082/MAX5083 are 250kHz PWM step-down DC-DC converters with an on-chip, 0.3Ω high-side switch. The input voltage range is 4.5V to 40V for the MAX5082 and 7.5V to 40V for the MAX5083. The output ...

Page 2

MAXPower Step-Down DC-DC Converters ABSOLUTE MAXIMUM RATINGS IN, ON/OFF to SGND..............................................-0.3V to +45V LX to SGND .................................................-0. BST to SGND ................................................-0. BST to LX................................................................-0.3V to +12V PGND to SGND .....................................................-0.3V to +0.3V REG, DVREG, ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 12V ON/OFF REG DVREG are 25°C.) (Note 1) A PARAMETER SYMBOL OSCILLATOR Frequency Maximum Duty Cycle SYNC High-Level Voltage SYNC Low-Level Voltage SYNC Frequency Range ...

Page 4

MAXPower Step-Down DC-DC Converters (V = 12V, see Figure 5 (MAX5082) and Figure 6 (MAX5083 UNDERVOLTAGE LOCKOUT HYSTERESIS vs. TEMPERATURE (MAX5082) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -40 - ...

Page 5

Figure 5 (MAX5082) and Figure 6 (MAX5083 MAXIMUM DUTY CYCLE vs. INPUT VOLTAGE (MAX5083) 100 ...

Page 6

MAXPower Step-Down DC-DC Converters (V = 12V, see Figure 5 (MAX5082) and Figure 6 (MAX5083 EFFICIENCY vs. LOAD CURRENT 100 12V OUT ...

Page 7

PIN NAME MAX5082 MAX5083 1 1 COMP Error Amplifier Output. Connect COMP to the compensation feedback network. Feedback Regulation Point. Connect to the center tap of a resistive divider from converter output to SGND to set the ...

Page 8

MAXPower Step-Down DC-DC Converters IN LDO REG EN 1.23V REF V I REF SS 1.23V SS E/A FB COMP IN EN SYNC RAMP OSC 0.3V Figure 1. MAX5082 Simplified Block Diagram Internal Linear Regulator (REG) REG is the ...

Page 9

IN LDO REG 1.23V EN REF V I REF SS 1.23V SS E/A FB COMP IN EN SYNC RAMP OSC 0.3V Figure 2. MAX5083 Simplified Block Diagram Soft-Start and Reference (SS the 1.23V reference bypass connection for the ...

Page 10

MAXPower Step-Down DC-DC Converters pump is omitted and the input voltage range is from 7.5V to 40V. In this situation, the boost diode and the boost capacitor are still required (see the MAX5083 Typical Operating Circuit). Gate Drive ...

Page 11

⎡ V OUT − ⎢ ⎣ FB where V = 1.23V. FB Inductor Selection Three key inductor parameters must be specified for operation with the MAX5082/MAX5083: inductance value (L), peak inductor current (I ...

Page 12

MAXPower Step-Down DC-DC Converters equal to 20% and 80%, respectively. ∆I peak inductor current (see the Input Capacitors Selection section) and f is the converter’s switching frequency. SW The allowable deviation of the output voltage during fast load ...

Page 13

OUT EA R4 REF GAIN CLOSED-LOOP (dB) GAIN Figure 3. Error Amplifier Compensation Circuit (Closed-Loop and Error-Amplifier Gain Plot) for Ceramic Capacitors Pick a value for ...

Page 14

MAXPower Step-Down DC-DC Converters OUT EA R4 REF GAIN CLOSED-LOOP (dB) GAIN Figure 4. Error Amplifier Compensation Circuit (Closed-Loop and Error Amplifier Gain Plot) ...

Page 15

V IN 4.5V TO 40V R1 1.4MΩ C1 10µF R2 549kΩ C2 0.1µF PGND Figure 5. MAX5082 Typical Application Circuit V IN 7.5V TO 40V R1 1.4MΩ REG C1 10µF ON/OFF R2 301kΩ C2 0.1µF PGND Figure 6. MAX5083 Typical ...

Page 16

MAXPower Step-Down DC-DC Converters V IN 7.5V TO 40V R1 REG C1 ON/OFF R2 C2 PGND TOP VIEW REG 15 SGND ______________________________________________________________________________________ Typical Operating Circuits (continued DVREG BST ...

Page 17

For the latest package outline information www.maxim-ic.com/packages.) D D/2 MARKING XXXXX PIN # 1 I.D. C -DRAWING NOT TO SCALE- ______________________________________________________________________________________ 1.5A, 40V, MAXPower ...

Page 18

... T2855 T2855-5 WHHD-1 WHHD-2 ----- T2855-6 T2855-7 T2855-8 T2855N-1 T3255-2 T3255-3 T3255-4 T3255N-1 T4055-1 Printed USA is a registered trademark of Maxim Integrated Products, Inc. EXPOSED PAD VARIATIONS DOWN BONDS MIN. NOM. MAX. MIN. NOM. MAX. ±0.15 ALLOWED 3.00 3.10 3.20 3.00 3.10 3. 3.00 3.10 3 ...

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