MAX16909 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 36V, 220kHz to 1MHz Step-Down Converter with Low Operating Current

19-5777; Rev 0; 3/11
MAX16909
36V, 220kHz to 1MHz Step-Down Converter
with Low Operating Current
General Description
The MAX16909 is a 3A, current-mode, step-down con-
verter with an integrated high-side switch. The device is
designed to operate with input voltages from 3.5V to 36V
while using only 30FA quiescent current at no load. The
switching frequency is adjustable from 220kHz to 1MHz
by an external resistor and can be synchronized to an
external clock. The output voltage is pin selectable to
be 5V fixed or adjustable from 1V to 10V. The wide input
voltage range along with its ability to operate at high duty
cycle during undervoltage transients make the device
ideal for automotive and industrial applications.
The device operates in skip mode for reduced current
consumption in light-load applications. Protection features
include overcurrent limit, overvoltage, and thermal shut-
down with automatic recovery. The device also features
a power-good monitor to ease power-supply sequencing.
The device operates over the -40NC to +125NC automo-
tive temperature range, and is available in 16-pin TSSOP
and TQFN (5mm x 5mm) packages with exposed pads.
Applications
Automotive
Industrial/Military
High-Voltage Input DC-DC Converter
Point-of-Load Applications
Features
S Wide 3.5V to 36V Input Voltage Range
S 42V Input Transients Tolerance
S High Duty Cycle During Undervoltage Transients
S 5V Fixed or 1V to 10V Adjustable Output Voltage
S Integrated 3A Internal High-Side (70mI typ)
Switch
S Fast Load-Transient Response and Current-Mode
Architecture
S Adjustable Switching Frequency (220kHz to 1MHz)
S Frequency Synchronization Input
S 30µA Standby Mode Operating Current
S 5µA Typical Shutdown Current
S Overvoltage, Undervoltage, Overtemperature, and
Short-Circuit Protections
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to: www.maxim-ic.com/MAX16909.related
Typical Application Circuit
VBAT
CIN1
47µF
C_COMP1
2.7nF
RCOMP
47kI
C_COMP2
10pF
C_IN2
4.7µF
RFOSC
65kI
SUP
EN
FSYNC
SUPSW
BST
LX
COMP ^MAX16909
OUT
FOSC
FB
C_BIAS
1µF
BIAS
PGOOD
GND
CBST
0.1µF
VOUT
L1
10µH
D1
VOUT
5V AT 3A
COUT
100µF
VBIAS
VBIAS
RPGOOD
10kI
POWER GOOD
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.