MAX1887EEE Maxim Integrated Products, MAX1887EEE Datasheet - Page 5

• Manufacturer Part Number: MAX1887EEE
• Description: Current Mode PWM Controllers
• Manufacturer: Maxim Integrated Products

Specifications of MAX1887EEE

• Number Of Outputs: 1
• Mounting Style: SMD/SMT
• Package / Case: QSOP-16
• Switching Frequency: 550 KHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• Topology: Boost

Note 1: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = PGND, V
Note 2: The trigger delay time, t
Note 3: The 20-pin MAX1897 has a separate analog PWM supply voltage input (V
Note 4: Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the MAX1897’s
Note 5: Specifications to -40°C are guaranteed by design and not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
(MAX1897), T
Shutdown Supply Current (V
(MAX1897, Note 3)
CURRENT SENSING
On-Time Adjustment Range
COMP Output Current
Current-Balance Offset
Current-Sense, Common-Mode
Range
Positive Current-Limit Threshold
Negative Current-Limit
Threshold
ILIM Standby Threshold Voltage
FAULT PROTECTION
V
Threshold (Note 3)
GATE DRIVERS
DH Gate-Driver On-Resistance
(Note 4)
DL Gate-Driver On-Resistance
(Note 4)
LOGIC
TRIG Logic Levels
TON Logic Levels (MAX1897)
CC
/V
DD
500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times may be different due to
MOSFET switching speeds.
MAX1887 device, the analog PWM supply voltage input and the gate-driver supply voltage input are internally connected and
named V
QFN package. The MAX1887 and MAX1897 contain the same die, and the QFN package imposes no additional resistance in-
circuit.
PARAMETER
Undervoltage Lockout
A
= -40°C to +85°C, unless otherwise noted.) (Note 5)
DD
.
_______________________________________________________________________________________
CC
TRIG
)
CC
, is measured from the time the TRIG pin transitions to time when the DL pin goes low.
SYMBOL
R
R
V
I
= V
V
COMP
ON ( D H )
V
ON(DL)
C_LIM
TRIG
TON
DD
Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
= 5V, V
Measured at V
0.42 < V
Sink and source
(V
(V
-100mV ≤ (V
≤ +100mV
CM+, CM-, CS+, CS-
V
V
V
Rising edge, hysteresis = 20mV, switching
disabled below this level
V
5V
High state (pullup)
Low state (pulldown)
350mV hysteresis
Logic high (V
Open (300kHz operation)
Logic low (GND; 550kHz operation)
CM+
CS+
CS+
BST
CM+
CS+
OUT
- V
- V
- V
- V
- V
- V
LX
COMP
CS-
CS-
CM-
CS-
CM-
= V
forced to
CM+
), I
) -
and
CC
COMP
CC
< 2.8V, V
COMP
CONDITIONS
; 200kHz operation)
- V
; SHDN = GND
CM-
= 1.2V, V
= 0,
)
OUT
MAX1887
MAX1897
MAX1887
MAX1897
MAX1887
MAX1897
V
V
V
V
High
Low
ILIM
ILIM
ILIM
ILIM
≥ 0.7V
MAX1887
MAX1897
CC
CM+
= 0.5V
= 1V
= 0.5V
= 1V
) and gate-driver supply input (V
= V
CM-
= V
CS+
V
MIN
47.5
97.5
-160
3.45
-2.0
-2.0
-0.2
-40
-80
0.2
3.0
CC
1.5
30
- 0.4
= V
CS-
TYP
= 1.2V, SHDN = V
DD
). For the 16-pin
BST
102.5
MAX
+2.0
+2.0
-140
+2.0
52.5
3.85
+40
-70
0.3
3.5
4.5
3.5
4.5
1.0
2.0
1.2
3.1
0.5
5
= 5V, and a
UNITS
mV
mV
mV
µA
µA
%
Ω
Ω
V
V
V
V
V
CC
5