scope:

This drawing forms a part of a one part - one part number documentation system (see 6.6 herein). Two product assurance classes consisting of military high reliability (device classes B, Q, and M) and space application (device classes S and V) and a choice of case outlines and lead finishes are available and are reflected in the Part or Identifying Number (PIN). Device class M microcircuits represent non-JAN class B microcircuits in accordance with 1.2.1 of MIL-STD-883, "Provisions for the use of MIL-STD-883 in conjunction with compliant non-JAN devices". When available, a choice of Radiation Hardness Assurance (RHA) levels are reflected in the PIN.

The PIN shall be as shown in the following example:

Device classes M, B, and S RHA marked devices shall meet the MIL-M-38510 specified RHA levels and shall be marked with the appropriate RHA designator. Device classes Q and V RHA marked devices shall meet the MIL-I-38535 specified RHA levels and shall be marked with the appropriate RHA designator. A dash (-) indicates a non-RHA device.

The device type(s) shall identify the circuit function as follows:

Device type Generic number Circuit function 01 MAX638A +5 V/adjustable output CMOS step-down switching regulator 02 MAX638B +5 V/adjustable output CMOS step-down switching regulator

The device class designator shall be a single letter identifying the product assurance level as follows:

Device class Device requirements documentation M Vendor self-certification to the requirements for non-JAN class B microcircuits in accordance with 1.2.1 of MIL-STD-883 B or S Certification and qualification to MIL-M-38510 Q or V Certification and qualification to MIL-I-38535

The case outline(s) shall be as designated in MIL-STD-1835 and as follows:

Outline letter Descriptive designator Terminals Package style P GDIP1-T8 or CDIP2-T8 8 Dual-in-line

The lead finish shall be as specified in MIL-M-38510 for classes M, B, and S or MIL-I-38535 for classes Q and V. Finish letter "X" shall not be marked on the microcircuit or its packaging. The "X" designation is for use in specifications when lead finishes A, B, and C are considered acceptable and interchangeable without preference.

Supply voltage (+V_S to GND) ...................... 18.0 V dc Output voltage (L_X, LBO) ......................... 18.0 V dc Input voltage range (COMP, LBO, LBI, V_FB) ........ −0.3 V dc to (+V_S + 0.3 V dc) Output current (L_X) .............................. 525 mA peak Output current (LBO) ............................. 50 mA Power dissipation: Up to +70°C .................................... 640 mW Derate above +70°C ............................. 8 mW/°C Storage temperature range ........................ −65°C to +150°C Lead Temperature (soldering, 10 seconds) ......... +300°C Thermal resistance, junction-to-case (Θ_JC) ....... See MIL-STD-1835 Thermal resistance, junction-to-ambient (Θ_JA) .... 125°C/W Junction temperature (T_J) ........................ +150°C

Supply voltage range, V_OUT = +5 V (+V_S).............. 5.0 V dc to 16.5 V dc Supply voltage range, adjustable mode (+V_S).......... 2.6 V dc to 16.5 V dc Ambient operating temperature range (T_A)............. −55°C to +125°C

intended Use: