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MAX8546EUB ,Low-Cost / Wide Input Range / Step-Down Controllers with Foldback Current LimitTable of Contents I. ........Device Description V. ........Quality Assurance Information II ..
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MAX8546EUB
Low-Cost / Wide Input Range / Step-Down Controllers with Foldback Current Limit
MAX8546EUB Rev. A RELIABILITY REPORT
FOR
MAX8546EUB PLASTIC ENCAPSULATED DEVICES
August 9, 2003
MAXIM INTEGRATED PRODUCTS 120 SAN GABRIEL DR.
SUNNYVALE, CA 94086
Written by Reviewed by
Jim Pedicord Bryan J. Preeshl
Quality Assurance Quality Assurance
Reliability Lab Manager Executive Director
Conclusion The MAX8546 successfully meets the quality and reliability standards required of all Maxim products. In addition,
Maxim’s continuous reliability monitoring program ensures that all outgoing product will continue to meet Maxim’s quality
and reliability standards.
Table of Contents
I. ........Device Description V. ........Quality Assurance Information
II. ........Manufacturing Information VI. .......Reliability Evaluation
III. .......Packaging Information IV. .......Die Information .....Attachments
I. Device Description A. General
The MAX8546 is a voltage-mode pulse-width-modulated (PWM), step-down DC-DC controller ideal for a variety of
cost-sensitive applications. It drives low-cost N-channel MOSFETs for both the high-side switch and synchronous
rectifier, and require no external current-sense resistor. This device can supply output voltages as low as 0.8V.
The MAX8546 has a wide 2.7V to 28V input range, and does not need any additional bias voltage. The output voltage
can be precisely regulated from 0.8V to 0.83 x VIN. This devices can provide efficiency up to 95%. Lossless short-
circuit and current-limit protection is provided by monitoring the RDS(ON) of the low-side MOSFET. The MAX8546
has a current-limit threshold of 165mV. The device features foldback-current capability to minimize power dissipation
under short-circuit condition. Pulling the COMP/EN pin low with an open-collector or low-capacitance, open-drain
device can shut down the device.
The MAX8546 operates at 300kHz. The MAX8546 is compatible with low-cost aluminum electrolytic capacitors. Input
undervoltage lockout prevents proper operation under power-sag operations to prevent external MOSFETs from
overheating. Internal soft-start is included to reduce inrush current. This device is offered in space-saving 10-pin
µMAX packages. B. Absolute Maximum Ratings Item Rating
(All voltages referenced to GND unless otherwise noted.)
VIN to GND -0.3V to +30V
VCC to GND -0.3V, lower of 6V or (VL + 0.3V)
FB to GND -0.3V to +6V
BST to GND -0.3V to +36V
VL, DL, COMP to GND -0.3V to (VCC + 0.3V)
BST to LX -0.3V to +6V
DH to LX -0.3V to (VBST + 0.3V)
VL Short to GND 5s
LX to GND 0 to 30V
Input Current (any pin) ±50mA
Operating Temperature Range -40°C to +85°C
Junction Temperature +150°C
Storage Temperature Range -65°C to +150°C
Lead Temperature (soldering, 10s) +300°C
Continuous Power Dissipation (TA = +70°C)
II. Manufacturing Information A. Description/Function: Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit B. Process: B8 (Standard 0.8 micron silicon gate CMOS) C. Number of Device Transistors: 3007
D. Fabrication Location: California, USA
E. Assembly Location: Thailand, Philippines or Malaysia F. Date of Initial Production: July, 2003
III. Packaging Information A. Package Type:
10-Pin µMAX B. Lead Frame: Copper C. Lead Finish: Solder Plate D. Die Attach: Silver-Filled Epoxy E. Bondwire: Gold (1.0 mil dia.) F. Mold Material: Epoxy with silica filler
G. Assembly Diagram: # 05-3501-0016
H. Flammability Rating: Class UL94-V0
I. Classification of Moisture Sensitivity
per JEDEC standard JESD22-112: Level 1
IV. Die Information A. Dimensions: 58 x 72 mils B. Passivation: Si3N4/SiO2 (Silicon nitride/ Silicon dioxide) C. Interconnect: Aluminum/Si (Si = 1%) D. Backside Metallization: None E. Minimum Metal Width: 0.8 microns (as drawn) F. Minimum Metal Spacing: 0.8 microns (as drawn) G. Bondpad Dimensions: 5 mil. Sq. H. Isolation Dielectric: SiO2
V. Quality Assurance Information A. Quality Assurance Contacts: Jim Pedicord (Manager, Reliability Opertions) Bryan Preeshl (Executive Director of QA) Kenneth Huening (Vice President) B. Outgoing Inspection Level: 0.1% for all electrical parameters guaranteed by the Datasheet. 0.1% For all Visual Defects. C. Observed Outgoing Defect Rate: < 50 ppm D. Sampling Plan: Mil-Std-105D
VI. Reliability Evaluation A. Accelerated Life Test
The results of the 135°C biased (static) life test are shown in
Table 1. Using these results, the Failure Rate (l) is calculated as follows:
l = 1 = 1.83 (Chi square value for MTTF upper limit)
MTTF 192 x 4389 x 125 x 2 Temperature Acceleration factor assuming an activation energy of 0.8eV l = 8.69 x 10-9 l = 8.69 F.I.T. (60% confidence level @ 25°C)
This low failure rate represents data collected from Maxim’s reliability monitor program. In addition to
routine production Burn-In, Maxim pulls a sample from every fabrication process three times per week and subjects
it to an extended Burn-In prior to shipment to ensure its reliability. The reliability control level for each lot to be
shipped as standard product is 59 F.I.T. at a 60% confidence level, which equates to 3 failures in an 80 piece
sample. Maxim performs failure analysis on any lot that exceeds this reliability control level. Attached Burn-In
Schematic (Spec. # 06-5856) shows the static Burn-In circuit. Maxim also performs quarterly 1000 hour life test
monitors. This data is published in the Product Reliability Report (RR-1M). B. Moisture Resistance Tests
Maxim pulls pressure pot samples from every assembly process three times per week. Each lot sample
must meet an LTPD = 20 or less before shipment as standard product. Additionally, the industry standard
85°C/85%RH testing is done per generic device/package family once a quarter.
C. E.S.D. and Latch-Up Testing The PM32-4 die type has been found to have all pins able to withstand a transient pulse of ±400V, per Mil-
Std-883 Method 3015 (reference attached ESD Test Circuit). Latch-Up testing has shown that this device
withstands a current of ±250mA.
Table 1 Reliability Evaluation Test Results
MAX8546EUB
TEST ITEM TEST CONDITION FAILURE SAMPLE NUMBER OF IDENTIFICATION PACKAGE SIZE FAILURES
Static Life Test (Note 1) Ta = 135°C DC Parameters 125 0 Biased & functionality Time = 192 hrs.
Moisture Testing (Note 2) Pressure Pot Ta = 121°C DC Parameters uMAX 77 0 P = 15 psi. & functionality RH= 100% Time = 168hrs. 85/85 Ta = 85°C DC Parameters 77 0 RH = 85% & functionality Biased Time = 1000hrs.
Mechanical Stress (Note 2) Temperature -65°C/150°C DC Parameters 77 0 Cycle 1000 Cycles & functionality Method 1010
Note 1: Life Test Data may represent plastic DIP qualification lots.
Note 2: Generic Package/Process data
Attachment #1 TABLE II. Pin combination to be tested. 1/ 2/ 1/ Table II is restated in narrative form in 3.4 below. 2/ No connects are not to be tested. 3/ Repeat pin combination I for each named Power supply and for ground (e.g., where VPS1 is VDD, VCC, VSS, VBB, GND, +VS, -VS, VREF, etc). 3.4 Pin combinations to be tested. a. Each pin individually connected to terminal A with respect to the device ground pin(s) connected to terminal B. All pins except the one being tested and the ground pin(s) shall be open. b. Each pin individually connected to terminal A with respect to each different set of a combination of all named power supply pins (e.g., VSS1, or VSS2 or VSS3 or VCC1, or VCC2) connected to terminal B. All pins except the one being tested and the power supply pin or set of pins shall be open. c. Each input and each output individually connected to terminal A with respect to a combination of all the other input and output pins connected to terminal B. All pins except the input or output pin being tested and the combination of all the other input and output pins shall be open.
TERMINAL B
TERMINAL A
CURRENT
PROBE
(NOTE 6)
R = 1.5kW
C = 100pf
SHORT
R2
S2 R1
