Output voltage positive sense input, N/C if not used
Output voltage negative sense input, N/C if not used
Output voltage pin-strap
Voltage tracking input, N/C if not used
SMBus alert, N/C if not used
SMBus data, pull-up resistor required even if not used
SMBus clock, pull-up resistor required even if not used
Module fault indicator, N/C if module is stand-alone,
tied together if modules are current share configured
SMBus address pinstrap
Synchronization I/O, N/C if not used
Power good, pull-up resistor or configured as push-pull
Remote control or enable, N/C if not used, internal pull-up resistor
Digital-DC Communications bus, pull-up resistor or
configured as push-pull (stand-alone only) required
Pin-strap ground
For more information, please visit the
product page.
CUI Inc
│
MODEL:
NDM3Z-90
│
DESCRIPTION:
AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER
date
09/21/2016
│
page
3 of 34
TYPICAL APPLICATION CIRCUIT
TYPICAL APPLICATION CIRCUIT - PARALLEL OPERATION
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For more information, please visit the
product page.
CUI Inc
│
MODEL:
NDM3Z-90
│
DESCRIPTION:
AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER
date
09/21/2016
│
page
4 of 34
ABSOLUTE MAXIMUM RATINGS
parameter
V
in
digital pin voltage
analog pin voltage
ground voltage differential
operating temperature
storage temperature
Notes:
conditions/description
input voltage
CTRL, DDC, SA, SLRT, SDA, SCL, SYNC, VSET, PG,
FAULT
+S, V
O
, VTRK
GND, PREF, -S
T
P1
min
-0.3
-0.3
-0.3
-0.3
-40
-40
typ
max
16
6.0
6.5
0.3
150
150
units
V
V
V
V
°C
°C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated
in the Electrical Specification section of this specification is not implied.
Configuration File
The digital control circuit in this module uses a configuration file which determines the functionality and performance of the
product. The Standard configuration is designed to fit most application needs and the Electrical Specification table shows
parameter values of functionality and performance with the Standard configuration, unless otherwise specified. Changes
in Standard configuration might be required to optimize performance in specific applications. Changes to the Standard
configuration are required for current sharing operation.
PRODUCT ELECTRICAL SPECIFICATION
T
P1
= -30 to +95 °C, V
I
= 7.5 to 14 V, unless otherwise specified under Conditions.
Typical values given at: T
P1
= +25 °C, V
I
= 12.0 V, max I
O
, unless otherwise specified under Conditions.
V
O
defined by pin strap. Standard configuration.
External C
IN
= 1000 μF/12 mΩ + 24 x 10 μF, C
OUT
= 10 x 470 μF/5 mΩ + 10 x 100 μF. See Operating Information section
for selection of capacitor types.
Sense pins are connected to load.
parameter
input voltage (V
I
)
input voltage rise time (V
I
)
output voltage without
pin-strap (V
O
)
output voltage adjustment
range (V
O
)
output voltage adjustment in-
cluding PMBus margining (V
O
)
output voltage set-point
resolution (V
O
)
output voltage accuracy
2
(V
O
)
internal resistance +S/-S to
VOUT/GND (V
O
)
+S bias current (V
O
)
-S bias current (V
O
)
line regulation (V
O
)
I
O
= max I
O
V
O
= 0.6 V
V
O
= 1.0 V
V
O
= 1.8 V
V
O
= 0.6 V
V
O
= 1.0 V
V
O
= 1.8 V
V
O
= 0.6 V
V
O
= 1.0 V
V
O
= 1.8 V
0
100
114
-100
including line, load, temp
-1
47
20
20
2
2
2
2
2
2
2.5
3.5
5.0
90
125
100
0.60
0.54
0.025
1
monotonic
1.2
1.8
1.98
conditions/description
min
7.5
typ
max
14
6
units
V
V/ms
V
V
V
%V
O
%V
O
Ω
μA
μA
mV
mV
mV
mV
mV
mV
mVp-p
mVp-p
mVp-p
A
A
load regulation (V
O
)
I
O
= 0~100%
output ripple & noise (V
O
)
output current (I
O
)
current limit threshold (I
lim
)
Notes:
(up to 20 MHz)
2. For V
O
< 1.0 V accuracy is +/-10 mV. For further deviations see section Output Voltage Adjust using PMBus
cui.com
For more information, please visit the
product page.
CUI Inc
│
MODEL:
NDM3Z-90
│
DESCRIPTION:
AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER
date
09/21/2016
│
page
5 of 34
PRODUCT ELECTRICAL SPECIFICATION (CONTINUED)
parameter
short circuit current (I
SC
)
conditions/description
RMS, hiccup mode, V
O
= 1.0 V, 1.5 mΩ short
50% of max I
O
efficiency (η)
I
O
= max I
O
V
O
= 0.6 V
V
O
= 1.0 V
V
O
= 1.8 V
V
O
= 0.6 V
V
O
= 1.0 V
V
O
= 1.8 V
V
O
= 0.6 V
V
O
= 1.0 V
V
O
= 1.8 V
I
O
= 0
turned off with CTRL-pin
V
O
= 0.6 V
V
O
= 1.0 V
V
O
= 1.8 V
min
typ
12
87.6
91.4
94.3
83.7
88.7
92.5
10.5
11.5
13.1
1.29
1.35
1.82
0.44
320
PMBus configurable
FREQUENCY_SWITCH
200
-5
150
external sync
From VI > ~2.7 V to ready to be enabled
enabled by input voltage
enabled by CTRL pin
turn on delay duration
range PMBus configurable TON_DELAY
accuracy (actual delay vs set value)
turn off delay duration
range PMBus configurable TOFF_DELAY
accuracy (actual delay vs set value)
turn on ramp duration
output voltage on/off ramp up
time (0→100%,100→0% of V
O
)
(T
ONrise
/T
OFFfall
)
turn off ramp duration
ramp duration range PMBus configurable
TON_RISE/TOFF_FALL
ramp time accuracy for standalone operation (ac-
tual ramp time vs set value)
power good threshold (PG)
power good threshold range
(PG)
Notes:
max
units
A
%
%
%
%
%
%
W
W
W
W
W
W
W
kHz
power dissipation at max I
O
(d)
input idling power (P
Ii
)
input standby power (P
CTRL
)
switching frequency
(f
SW
= 1/T
SW
)
switching frequency range
2
(f
SW
= 1/T
SW
)
switching frequency set-point
accuracy (f
SW
= 1/T
SW
)
external sync pulse width
(f
SW
= 1/T
SW
)
input clock frequency drift tol-
erance (f
SW
= 1/T
SW
)
initialization time (T
INIT
)
output voltage
total on delay time (T
ONdel_tot
)
output voltage on delay time
(T
ONdel
)
output voltage off delay time
3
(T
OFFdel
)
640
5
kHz
%
ns
-10
67
T
INIT
+ T
ONdel
T
ONdel
3
5
-0/+2
0
-0/+2
5
10
%
ms
250
ms
ms
ms
ms
ms
ms
ms
4
250
Disabled in standard configuration.
Turn off immediately upon expiration
of turn off delay.
0
250
90
85
0
100
100
ms
μs
%V
O
%V
O
%V
O
rising
falling
PMBus configurable
POWER_GOOD_ON
VOUT_UV_FAULT_LIMIT
1. Value refers to total (internal + external) effective output capacitance. Capacitance derating with VO typical for ceramic capacitors (bias characteristics) and
temperature variations must be considered for the external capacitor(s). See section External Output Capacitors.
2. There are configuration changes to consider when changing the switching frequency, see section Switching Frequency.
3. The specified accuracy applies for off delay times larger than 4 ms. A value of 0 ms can be set to guarantee a fast shut-off, but this will force the device to
Immediate Off behavior, even if soft-off, i.e. ramp-down, is configured. When setting 0 ms the actual delay will be 0 ms.
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