HIP6200CB Intersil Corporation, HIP6200CB Datasheet - Page 5

• Manufacturer Part Number: HIP6200CB
• Description: Transient Voltage Regulator DeCAPitator
• Manufacturer: Intersil Corporation

Application Information
Theory of Operation
The HIP6200 is used in conjunction with a switching DC-DC
converter to provide a regulated DC voltage. The output
voltage of a DC-DC converter changes instantly with sudden
load changes characteristic of today’s microprocessors. This
change occurs because the bulk capacitors are imperfect;
they have parasitic resistances (ESR) and inductances (ESL)
which translate into voltage drops as the load is initially
supplied by the bulk capacitance. Also, due to its output
inductor, the DC-DC converter takes about 10-20 s (typical)
Typical Application Diagrams
C
before it provides the load current required by the CPU. The
HIP6200 contains two high-speed linear regulators which are
inactive except during the converter response time after high
di/dt load transients. When active, the linear regulators
BULK
FIGURE 1. PORTABLE CPU WITHOUT HIP6200, HIP6201
: (11) 220 F, 10V, 0.1 Tantalums
CONTROLLER
BATTERY
POWER
I
CPU
PWM
V
OUT
2-445
C
I
L
BULK
I
L
V
OUT
LOAD
I
CPU
CPU
HIP6200, HIP6201
maintain a small difference between the desired and actual
output voltage.
The Typical Application Diagrams below illustrate how the
DeCAPitator functions. The left side shows a common DC-
DC converter response to a fast ‘low-to-high’ load transient.
The right side shows a similar response with a HIP6200
circuit employed. The HIP6200 allows the use of fewer bulk
capacitors to handle the regulation requirements of the high
edge-rate load transients. The response time of the
HIP6200’s linear regulators (100ns typical) are fast enough
to help with the leading edge spike. Output voltage
deviations during the converter response time are reduced
with the HIP6200 since it helps supply the load while the
inductor current slews.
C
C
C
C
BULK
CAP
VCC
PVCC
: small Ceramic (0805)
V
: small Ceramic (0805)
FIGURE 2. PORTABLE CPU WITH HIP6200, HIP6201
C
: (5) 100 F, 10V, 0.1 Tantalums
BATTERY
CAP
: (1) 100 F, 10V, 0.1 Tantalum
CAP
POWER
I
CPU
CAP
EN
V
OUT
V
GND
+5V
CAP
8
5
4
I
HIP6201
OUT
V
CONTROLLER
3
CC
PWM
2
I
1
L
PGND
P
7
6
VCC
OUT
SNS
I
OUT
LOAD
CPU
C
CONVERTER
RESPONSE TIME (T
PVCC
I
L
I
CPU
C
BULK
V
OUT
R
)