MAX17000ETG+T

Product Summary

The MAX17000ETG+T is a pulse-width modulation (PWM) controller. The MAX17000ETG+T provides a complete power solution for notebook DDR, DDR2, and DDR3 memory. It comprises a stepdown controller, a source/sink LDO regulator, and a reference buffer to generate the required VDDQ, VTT, and VTTR rails. The VDDQ rail is supplied by a step-down converter using Maxims proprietary Quick-PWM controller. The high-efficiency, constant-on-time PWM controller handles wide input/output voltage ratios (low duty-cycle applications) with ease and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The Quick-PWM architecture circumvents the poor load-transient timing problems of fixed-frequency current-mode PWMs while also avoiding the problems caused by widely varying switching frequencies in conventional constant-on-time and constant- off-time PWM schemes. The MAX17000ETG+T senses the current to achieve an accurate valley current-limit protection. It is also built in with overvoltage, undervoltage, and thermal protections.

Parametrics

MAX17000ETG+T absolute maximum ratings: (1)TON to PGND1: -0.3V to +28V; (2)VDD to PGND1: -0.3V to +6V; (3)VCC to VDD: -0.3V to +0.3V; (4)OVP to AGND: -0.3V to +6V; (5)SHDN, STDBY, SKIP to AGND: -0.3V to +6V; (6)REFIN, FB, PGOOD1,; (7)PGOOD2 to AGND: -0.3V to (VCC + 0.3V); (8)CSH, CSL to AGND: -0.3V to (VCC + 0.3V); (9)DL to PGND1: -0.3V to (VDD + 0.3V); (10)BST to PGND1: -1V to +34V; (11)BST to LX: -0.3V to +6V; (12)DH to LX: -0.3V to (VBST + 0.3V); (13)BST to VDD: -0.3V to +26V; (14)VTTI to PGND2: -0.3V to +6V; (15)VTT to PGND2: -0.3V to (VTTI + 0.3V); (16)VTTS to AGND: -0.3V to (VCC + 0.3V); (17)VTTR to AGND: -0.3V to (VCSL + 0.3V); (18)PGND1, PGND2 to AGND: -0.3V to +0.3V; (19)Continuous Power Dissipation (TA = +70℃); (20)24-Pin, 4mm x 4mm TQFN-EP; (21)(derated 27.8mW/℃ above +70℃): 2222mW; (22)Operating Temperature Range: -40℃ to +85℃; (23)Junction Temperature: +150℃; (24)Storage Temperature Range: -65℃ to +150℃; (25)Lead Temperature (soldering, 10s): +300℃.

Features

MAX17000ETG+T features: (1)Quick-PWM with 100ns Load-Step Response; (2)Output Voltages—Preset 1.8V, 1.5V, or; (3)Adjustable 1.0V to 2.5V; (4)1% vout accuracy over line and load; (5)26v maximum input voltage rating; (6)accurate valley current-limit protection; (7)200khz to 600khz switching frequency; (8)source/sink linear regulator (vtt); (9)±2a peak source/sink; (10)low-output capacitance requirement; (11)output voltages-preset vddq/2 or refin; (12)adjustable from 0.5v to 1.5v; (13)low quiescent current standby state; (14)soft-start/soft-shutdown; (15)smps power-good window comparator; (16)vtt power-good window comparator; (17)selectable overvoltage protection; (18)undervoltage/thermal protections; (19)±3ma reference buffer (vttr).

Diagrams