RH1959MILDICE_15 Datasheet, PDF (1/2 Pages) Linear Technology – 4.5A, 500KHz Step-Down Switching Regulator

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DICE/DWF SPECIFICATION
RH1959MILDICE
4.5A, 500KHz Step-Down
Switching Regulator
PAD FUNCTION
DIE CROSS REFERENCE
1. GND
2. VC
3. SHDN
4. FB
5. SYNC
6. BOOST
7. V_IN
8. SW
LTC Finished
Part Number
Order
Part Number
RH1959MK
RH1959MK
RH1959MILDICE
RH1959MILDWF*
Please refer to LTC standard product data sheet for
other applicable product information.
*DWF = DICE in wafer form.
80mils × 138mils,
Backside metal: Alloyed gold layer
Backside potential: GND
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DESCRIPTION
The RH1959 is a 500kHz monolithic buck mode switching
regulator with an on-die 4.5A switch. It can accept inputs
up to 16V_IN to generate outputs as low as 1.21V_OUT. All
necessary circuitry including oscillator, control logic,
comparators, error amplifiers, and reference are included
on die, keeping solution size minimal and saving external
components. High switching frequency allows a consid-
erable reduction in the size of external capacitors and
inductor. The topology is current mode for fast transient
response and good loop stability. A special high speed
bipolar process and new design techniques achieve high
efficiency at high switching frequency. High efficiency is
maintained over a wide output current range by keeping
quiescent supply current to 4mA and by utilizing a boost
capacitor to saturate the NPN power switch. Full cycle-
by-cycle short-circuit protection and thermal shutdown
are provided for safe operation in overload conditions.
A shutdown signal reduces supply current to 20µA while
synchronization allows an external logic level signal to vary
adjust switching frequency between 580kHz and 1MHz.
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage..............................................................16V
Boost Voltage.............................................................30V
Boost Pin Above Input Voltage...................................15V
SHDN Pin Voltage........................................................7V
FB Pin Voltage...........................................................3.5V
FB Pin Current...........................................................1mA
SYNC Pin Voltage.........................................................7V
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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